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REGISTERED NO. D. (D.N.)-72

The Gazette of India

EXTRAORDINARY

PART II—Section 3—Sub-section (i)

PUBLISHED BY AUTHORITY

No. 11] NEW DELHI, FRIDAY, JANUARY 7, 1983/PAUSA 17, 1904

Separate Paging is given to this Part in order that it may be field as a separate

compilation

(1)

1171 GI/82—I

1171 GI/82—2

U71 OI/"2—4

!<•)

'31

MINISTRY OF SHIPPING & TR\NSPORT

(2) They shall come into force on the date

of their publication in the Official Gazette (Shipping Wing)

New Delhi, the 7th January. I9N1

NOTIFICATION

(Merchant Shipping)

G.S.R. 15(E).—In exercise of the powers con- ferred by section 296, read with sections 291 and 457, of the Merchant Shipping Act, 1958 (44 of J958), and in supersession of the Indian Meichant Shipping (Radio) Rules, J956, the Central Government hereby, makes the following rules namely :—•

PART-1

GENERAI,

1. Short title, commencement and applica- tion.—(1) These rules may be called the Mer- chant Shipping (Radio) Rules, 1981.

(3) They shall apply to ships which are -

(a) sea-going Indian ships;

(b) sea-going ships other than Indian ships while they are within India, including the territorial waters thereof, but are not—

(i) troop-ships not registered in India;

fii) ships not propelled by mechanical

means;

dii) Pleasure yachts;

Civ) fishing vessels; or

(v) cargo ships of less than 300 tons gross.

2. Definitions.—-In these rules, unless the con-

\t otherwise requires,-

(1) "Act" means the Merchant Shipping

LCI, 1958 (44 of 1958);

(u) "Class A l" in relation to classes oi emis- sion means telegraphy by on-ofT keying without the use of a modulating andio frequency;

(iii) "Class A2" in relation to classes oi cmis- s:on means telegraphy by on-off. keying of an amplitude-modulating audio fre- quency or audio frequencies, or, as the case may be, by the on-off keying of

the modulated emission;

Civ) "Class A3" in relation to classes of emis- sion means double side band amplitude modulated telephony;

(v) "Class B" in relation to classes of emis-

sion means damped waves;

(vi) "connected" means electrically connec-

ted.

(vii) "existing installation" means—-

fa) an installation wholly installed before the 25th day of May, 1965; and

(b) an installation part of which was in- stalled before the 25th da¹) or May, ) 965 and the rest of which consists either of parts installed in replace- ment of identical parts oi parts which comply with the relative lequirc ment of these rules;

f viii) "interference" means any emission, radia- tion or induction which endangers the functioning of a radio navigation service or of other safety services or seriousiv degrades, obstructs or repeatedly in- terrupts a radio communication service operating in accordance with these rules, or as the case may be, the Radio Regu- lations. Geneva, 1959;

fix) "mile" means a nautical mile of 1853.

144 metres;

fx) "ope/rating position" in relation to anv equipment means the position normally occuoied by a person when operating that equipment:

(xY) "pleasure yacbf" means a ship which, howsoever propelled, is exclusively used *V>r pleasure cruises and does no+ carry any passengers on payment of hi; fare;

fxii) "radio telegraph onerator" means a per- son who has had experience at sea as an onerator of radio teWraob anmratus on board a fi^iins vessel or anv other shin to which these rules do not anrrfv;

(xni) "radio telegraph ship" means a ship, be- ing a ship to which these rules apply, which is provided with a radio telegraph installation and which is not a radio- telephone ship;

(\rv) "radio telephone ship" means a ship, be- ing a ship to which these rules apply, of not less than 800 tons gross but less than 1600 tons gross, the owner or which has given the Central Government a nolice in writing that the ship is provided with a radio telephone insallation in compliance with these rules and such notice has not been withdrawn;

fxv) radio watch—

fa) in relation to radio telegraph phip means listening for signalling on the international distress frequency of 500 KHz; and

(b) in relation to a radio telephone ship, means listening for signalling on the international distress frequency of 2182 KHz;

(xvi) "Schedule" means a Schedule annexed

to these rules;

(xvii) "silence periods",—

(a) in relation to radio telegraph, means period of three minutes each begin- ning at 15 minutes and 45 minutes of each hour determined according to Greenwich Mean Time; and

(b) in relation to radio telephony, means periods of 3 minutes each beginning at each hour and 30 minutes of each hour determined according to Green- wich Mean Time ;

fxviii) "steamer" includes a ship propelled by electricity or other mechanical means of propulsion

3. Classification of ships.—The ships to which these rules apply shall be classified as follows, namely :—-

Class I.—(a) Indian ships, carrying more than 250 passengers or which arc in possession of a valid certificate issued by the Central Government or anv other person authorised by it in this behalf to the effect that such ships are lit to carry more than 250 passengers for voyages extending to 16 hours or more between two consecutive ports

fb) Ships other than Indian ships carrying more than 250 passengers or which are in possession of a certificate issued bv rrr pmropriate authority in the country

m which they are registered to the oiled dial ihcy ;uc lil to cany more than 2?U passengers, being ships which arrive at a port or place in India after having been at sea for lfi hours or more since leaving last port or being ships which seek clearance or transire from a port or place in India lor a voyage requiring 16 hours or more at sea before reaching the next port of call.

Class IT.—-(a) Passenger ships other than

those of Class I.

(b) Cargo ships of 1600 tons gross or upwards.

Class III.—Cargo ships of 500 tons gross or upwards but less than 1600 tons gross.

Class IV.—Cargo ships of 300 tons gross and

upwards but less than 500 tons gross.

4. Provision of radio installations.-—(l)Everv ship of Class I and Class II shall be provided with a radio telegraph installation which shall include the equipments specified in the First Schedule.

(2) Every ship of Class III and Class JV shall be provided with a radio telephone installation whihe shall include the equipment spccilied in the Second Schedule or with a radio telegraph ins- tallation which shall include tlic equipment specified in the Frst Schedule :

Provided that the main and reserve radio tele- graph transmitters in such ships may be combined into a single instrument, if that instrument is capable of complying with the requirements of Parts I and ] II of the First Schedule.

(3) Notwithstanding anything contained in sub- rules (1) and (2), Central Government may exempt any ship of Classes I, II, 111 and IV from all or any of the requirements of Hie foregoing provisions of this rule, subject to the following conditions, namely :—

(i) where it is shown to the satisfaction of the Central Government that the length of the voyage, the maximum distance of the ship from the shore, the absence of navigational hazards and other condi- tions affecting safety are such as 1o ren- der full or, as the case may be, partial application of vib-rnKs ({) :m0 (?) unreasonable or unnecessary;

fii) where it is shown to the satisfaction of the Central Government that exemp- tion from any of the requirements of sub-rules (H and (?) shall not affect the general efficiency of the distress ser- vice for the safety of all ships; ;

(hi) vvheie exemption is sought for in the ease of ships of Class I or Class II which are provided with radio telephone instal- lation as required under sub-rule (2).

5. Climatic and durability tests.-—(1) livery equipment the requirements in respect of which have been specified in these rules, excepting test measuring instruments provided in accordance with rule 14 or clause (f) of rule 24, shall be such that it shall be free of mechanical delects and comply with the requirements specified for it in the Third Schedule-

fa) while undergoing the vibration test, the dry heat test and the low temperature test,

(b) when subjected to the damp heat test,

and

(c) while undergoing such of the other tests as arc applicable to the equipment.

(2) Any such equipment which is intended for use in the open or in an open boat shall be such that after undergoing the mould growth test re- quired by the Third Schedule, no mould growth shall be present on it.

6. Interference with reception.--d) At no tint.; while the ship is at sea the interference or mechani- cal noise produced by the radio installation or by any other equipment in the ship shall be such as to "prevent the effective reception of radio signals bv means of the radio installation provided on board the ship.

(2) Any ship which is provided with a radio telegraph installation, not being an existing instal- lation, shall also be provided with a communal aerial system for all broadcast receivers in respect of which it is impracticable to effect and properly installed aerials which do not intefere with the •efficiency of such radio telegraph installation.

7. High Voltage parts.— d) All parts and wiring of the equipment specified in these rules in which the direct and the alternating voltages (other than radio frequency voltages) combine at any time to give an instantaneous voltage greater than 50 volts shall be protected from ac-

cidental access.

(2) All parts and wring of the equipment speci- fied in these rules (other than the parts and wiring of a rotating machine) in which the direct and the alternating voltage other than radio frequency voltages combine at any time to give an instant- aneous voltage greater than- -

(a) 50 volts in the case of equipment speci- fied in the Second Schedule and the Fourth Schedule; and

(b) 250 volts in the case of other equipment, shall be isolated automatically from all

sources of electrical energy when the means of protection are removed.

8. Charging of batteries.—(1) If on any ship batteries are provide as a source of electrical energy for any part of the equipment required by these rules, means shall be provided on board every such ship for the charging of such batteries from the ship's main sources of electrical energy.

(2) Such batteries, whether they form part of the main installation or the reserve installation, shalT be brought up to the normal fully charged condition daily while any such ship is at sea.

PART-II

RADIO TELEGRAPHY

9. Flectrical independence of main and reserve radio telegraph equipments.—The main and re- serve radio telegraph ship shall be electrically independent of each other.

10. Radio telegraph room.—(l)(a) Ever} radio telegraph installation provided on board a radio telegraph ship shall be installed in one or more radio telegraph rooms.

(b) The radio telegraph rooms shall not bo used for purposes other than those asociated with the functions and duties of a radio officer.

(c) The radio telegraph room shall be :—

(a) in such a position that there shall be no disturbance either extraneous or other- wise to the effective reception of radio' signals;

(b) as high in the ship as practicable so that the greatest possible degree of safety may be achieved;

(c) of such dimensions as shall be sufficient to enable efficient operation, at all times, of the radio telegraph equipment instal- led therein; and

(d) adequately ventilated.

(2) Every radio telegraph installation provided on board a radio telegraph ship shall be instal- led in such a position that it will be portected against disturbance to its effectiveness by water or hv extremes of temperature and shall, at all times when tho ship is at sea, be readily acc.isible both for immediate use and repairs.

(3) Every radio telegraph room shall be pro-

vided with:—

Ca)(i) an efficient two-way means of cull- ing and voice communication with the bridge and any other p!ac'i from which the ship is normally navigated.

(n) such means of communication shall be a telephone or some other means equally efficient;

(b)(i) a reliable clock, equipped with a dial of not less than 12.5 centimetres in diameter and a concentric second hand, the face of which shall be mar- ked to indicate the silence periods.

(ij) it shall be securely mounted in such a position that the entire dial can be easily and accurately visible from the radio telegraph operating position and, if the ship is provided with a radio telegraph auto-alarm equipment, from the position normally occupied by a person for testing the radio telegraph auto-alarm receiver;

(c)fi) an electrical lamp, operated from the reserved source of electrical energy required by sub-rule (2~> of rule 13, and permanently arranged so as to be capable of providing adequate illumination of the operating controls of the main and reserve radio tele- graph installations and of the clock required by clause ( b );

Cii) such lamp shall be controlled by two- way switches placed respectively at the entrance of the radio telegraph room and at the radio telegraph ope- rating position;

(iii) the switches shall be clearly labelled

to indicate their purpose;

(d) an inspection lamp which shall either be an electrical lamp or a flash light and if it is an electrical lamp, it shall be operated from the reserve source of electrical energy Vequlired by sub-rule (2) of rule 13 and shall be provided with a flexible lead of adequate length to enable all parts of the radio telegraph installation to be easily seen;

(e¹) a chair capable of being fixed at the

radio telegraph operating position.

(4) A complete list of spare equipment and spare parts carried on board the ship in accordance with rule 14 shall always be available in every radio telegraph room and such list shall indicate the location on board of such spare equipment and parts.

(5) A calibration table or calibration curve for each transmitter and receiver forming part of the radio telegraph installation shall always be avail- able in every radio telegaph room, unless the trans- mitter or, as the case mRy be. the receiver is direct- ly calibrated.

1171 GI/82—6

(6) A complete diagram of the wiring of the la-J'o telegraph installation shall always be avail- ible in, every radio telegraph room :

Provided that nothing in this sub-rule shall apply to an existing radio telegraph ins- tallation in any ship of Class TV.

(7) If a separate room is provided on board iny ship for operating the reserve radio telegraph rquipmcnt, it shall be provided with equipments, irticles and fittings as required by sub-rules (2) ind (3). I

(8) Every radio telegraph room shall be pro- vided with a manual containing circuit diagrams md other relevant data required for the mainten- ance of cverv part of the radio telegraph installa- tion together with instructions on the use, opera- tiCii and maintenance of every such part.

(9) In every radio telegraph room there shall be displayed a card of instructions prescibing the procedure to be followed in transmitting automa- tically the radio telegraph alarm signal and the distress call by using—

fi) the reserve telegraph transmitter speci- fied in Part III of the First Schedule ; and

(ii) the automatic keying device specified in

Part V of the First Schedule.

(10) In every radio telegraph room there shall be displayed a cord of instructions giving a sum- mary or radio telegraph distress procedure for im- mediate reference in the even of an emergency.

11. Aerials.-—(1) Every radio telegraph ship shall be fitted with a main aerial and a reserve aerial :

Provided that the Central Government or any other Officer authorised by it in this behalf may exempt any ship from the requirement of a reserve aerial if that Government or the officer is satisfied that the fitting of such an aerial is im- practicable or unreasonable and any ship so exempted shall carry—

fa) if the main aerial is a supported wire aerial, a spare aerial completely assembled for rapid replacement of the main aerial; or

(b) if the main aerial is not a supported wire aerial, a spare aerial complete with supporting structures which shall be capable of rapid erection while the ship is at sea.

(2) (a) In the case of a ship of Class I, Class IT or Class TIT, each" of the halyard used for sup- porting such main aerial shall be fitted with a safe- ty loop between the masthead or other aerial support and an aerial insulator.

(b) Such safety loop shall consist of part of the halyard not less than 92 centimetres lon;_. the loop being closed by a link, not more than 38 centimetres long, with a breaking load of not more than one-third of the breaking load of the aerial or of the halyard, whichever is less.

(3) A rigging plan of aerials shall always be available in the radio telegraph room and it shall show the following, namely :—

(a) elevation and plan views of the aerials ;

(b) the measurements of the aerials; and

(c) the height of the aerials in metres mea- sured in the matter specified in the Fifth Schedule.

(4) Means shall be provided for quickly con-

necting—

(a) either the main aerial or the reserve aerial, if any, to the main transmitter and also to the reserve transmitters ; and

(b) the main and reserve receivers, the radio telegraph auto alarm equipment and the loud speaker watcji keeping receivers, to any aeriol with which they may be required to b: used.

12. Range of transmitters.—(1) The normal ranges of radio telegraph transmitters provided in accordance with the foregoing provisions of these rules, when connected to the main aerial, shall not be loss than—

(a) in the case of a ship of Class I—282 kilometres for the main transmitter and 242 kilometres for the reserve transmit- ter ;

(b) in the case of a ship of Class II—242 kilometres for the main transmitter and 161 kilometres for the main transmitter and 161 kilometres for the reserve trans- mitter ;

(c) in the case of a ship of Cla^s Til—161 kilometres for the main transmitter and 121 kilometres for the reserve transmit- ter; and

(d) in the case of a ship of Class IV—121 kilometres both for the main and re- serve transmitters.

(2) The normal range of a radio telegraph transmitter for the purposes of these rules shall be determined at the option of the owner of the ship, either by calculation or by test.

(3) For the purposes of these rules, the normal range of a radio telegraph transmitter, when deter- mined by calculation on a frequency of 500 KHz,

shall be calculated in the manner specified in the Fifth Schedule.

(4) For the purposes of these rules, the normal range of a radio telegraph transmitter, when de- termined by test, shall be the distance to which signals can be transmitted by such transmitter over the sea by day under normal conditions on a frequency of 500 KHz so as to set up at the re- ceiver a total root mean square field ^irength of at least 50 micro volts per metre.

13. Supply of electrical energy.—(1) (i) In every radio telegraph ship a supply of electrical energy shall be available from the ship's main source of electrical energy at all times while such ship is at sea and at all reasonable times while I it is in port and such supply of electrical energy shall be adequate for—

(a) the operation of the main radio telegraph equipment in accordance with these rules ;

(b) testing purposes ; and

(c) the charging of any batteries which are a source of electrical energy for the radio telegraph installation.

(ii) The voltage of the supply for the main ins- tallation shall be maintained within plus or minus 10 per cent of the rated voltage.

(iii) The supply of electrical energy shall, if it is a direct current supply be of correct polarity and a metre to indicate this shall be fixed in the radio telegraph room unless otherwise provided :

Provided that in the case of any ship not en- gaged on an, international voyage, the aforesaid supply of electrical energy may be derived from a battery, in which case a duplicate shall also be provided for that purpose.

(2) (a) The reserve equipment shall be pro- vided with a source of electrical energy indepen- dent of the propelling power of the ship and the ship's electrical system.

(b) Such reserve equipment and all parts there- of shall be placed as high in the ship as practic- ! able.

(3) (a) The source of electrical energy pro- vided for the reserve equipment shall preferably consist of accumulator ' ;\i11 be capable of being charged from the ship's main source of electrical enegry and it shall, under all circumstances, be capable of being brought into immediate operation by means of a switchboard.

(b) Theoswitch board so provided shall be capable of being illuminated by an tlectric lamp and it shall be situated in the radio telegraph room or as near thereto as possible so as to be readily accessible from radio telegraph room.

(c) The source of electrical energy so provid- ed for the reserve equipment shall be of such capacity and shall be so maintained at all times that it shall be able to supply electrical energy for six hours, continuous operation of the following consumption requirements whether or not it is in use for any other purpose, namely :—

(a) the current required to operate the re-

serve transmitter with the key up ;

(b) three-fifths of the difference between the current required to operate the reserve transmitter with the key down and the current required to operate it with the key up ;

(c) the current required to operate the re-

serve receiver; and

(d) the current consumed by the lamps re- quired by clause (c) of sub-rule (3) oi' rule 10 and by the foregoing provisions of this sub-rule.

(4) The reserve source of electrical energy provided in pursuance of sub-rule (2) shall not be used at any time except for the operation of—

(a) the reserve transmitter and receiver ;

(b) the lamps required by clauses (c) and (d) of sub-rule (3) of rule 10 and by sub-rule (3) of this rule ;

(c) the automatic keying device ;

(d) the radio telegraph auto-alarm equip-

ment; and

(e) the direction finder.

(5) Notwithstanding the provisions of sub-rule (4), the Central Government may permit in any ship of Class III or Class IV the reserve source of electrical energy being used to supply electrical energy to any low power emergency Circuits which are wholly confined to the upper part of the ship if it is satisfied that such circuits are capable of being readily disconnected and the reserve source of electrical energy is capable of supplying th- additional load to such circuits without failling below the capacity required by sub-rule (3).

14. Tools, measuring instruments, snare parts etc.—Every radio telegraph ship shall be provid- ed with the tools, measuring instruments, spare parts and other materials specified in Part I of the Sixth Schedule.

15. Provision of radio officers.—(1) Every radio telegraph ship which upon proce^lir;! tc sea is not provided with a radio telegraph auto- alarm equipment complying with the requirements

specified in the Seventh Schedule, shall be provid- ed with radio officers as specified below—

(a) Ships of Class I three radio officer.

(b) Ship;, of Class II (i) two radio officers if the ship is expected to remain at sea for not more than 48 hours between two consecu- tive ports; or

(ii) three radio officers if the ship is expected to remain at sea for more than 48 hours at sea between two consecu- tive ports.

Class IV

(c) Ships of Class III and (i) one radio officer if the ship is expected to remain at sea for not more than 12 hours between two consecutive ports; or

(ii) two radio officers if the ship is expected to remain at sea for more than 12 hours but not exceeding 48 hours between two consecutive ports; or

(iii) three radio officers if the ship is expected to remain at sea for more than 48 hours between two consecu- tive ports.

(2) Every radio telegraph ship which upon pro- ceeding to sea is provided with a radio telegraph auto-alarm equipment specified in the Seventh' Schedule shall be provided with radio officers as specified below—

(a) Ships of Class I—two radio officers.

(b) Ships of Classes II, III and IV.

—one radio officer.

16. Qualifications of radio officers.—(!) For the purposes of these rules, no person shall be deemed to be qualified for being appointed as a radio officer on board an Indian ship unless he holds a First or Second Class Radio Telegraph Operators Certificate of Proficiency or Compe- tency or such other equivalent certificate which may have been established by any other law for the time being in force in India and valid licence to operate wireless telegraphy granted by-~

(a) the Central Government or any other authority appointed by it in this behalf by a notification in the Official Gazette; or

(b) an administration of any other country provided that the Central Government has recognised the Certificate of Profi- ciency as equivalent to a certificate of proficiency issued by it and has issued to the holder an authority to operate . radio telegraph ship station of Indian

Registry.

(2) In the case of at least one radio officer on board a radio telegraph ship registered in India which is a passenger ship of Class I or Class II, the certificate required under sub-rule (1) shall be a first class certificate or such other equivalent certificate which may have been; established by any other law for the time being in force in India,. '

(3) For the purpose of sub-rule (1), no licence to operate wireless telegraphy shall be deemed to be valid at any date unless it satisfied the relevant conditions of validity and revalidation of such licences specified in the Indian Wireless Telegraph (Commercial Radio Operators Certificates of Pro- ficiency and Licence to operate Wireless Tele- graphy) Rules, 1954.

(4) At least one of the radio officers on board a ship, registered in India, of Class I or Class II shall be a person who has had experience at sea as a radio officer or radio telegraph operator for a total period of not less than—

(a) two years in the case of ships of Class

(b) one year in the case of ships of Class

H(a);

(c) six months in the case of ships of Class II(b) being ships of 3000 tons gross and upwards; and

(d) three months in the case of ships of class II(b) being ships of 1600 tons gross and upwards but under 3000 tons gross.

(5) In the case of ships other than Indian ships while they are at a port or place in India or with- in the territorial waters of India, no person shall be deemed to be a radio officer unless he holds a valid certificate of proficiency or competency in radio telegraphy granted by an authority recognis- ed in that behalf bv the laws of the country in which the ship is registered.

17. Radio watch.—(1) Subject to the provi- sions of sub-rule (1) of rule 18, radio watch shall be maintained on board every radio telegraph ship as specified below, namely :—

(a) If, upon proceeding to sea, the ship is not provided with a radio telegraph auto-alarm equipment specified in the Seventh Schedule, a continuous watch round the clock for twenty four hours shall be maintained.

(b) If, upon proceeding to sea, the ship is provided with a radio telegraph auto- alarm equipment specified in the Seventh Schedule—

(i) in the case of ships of Class I a watch of sixteen hours a day shall be main- tained at the times specified in the Eighth Schedule;

(ii) in the case of ships of Classes II, III and IV, a watch of eight hours a day shall be maintained at the times spe- cified in the Eighth Schedule.

(2) Any radio telegraph auto-alarm equipment provided on board a radio telegraph ship shall be kept in operation at all times at which a radio walch is not maintained :

Provided that nothing in this sub-rule shall ap- ply to ships which are fitted with direction finders in compliance with the Merchant Shipping (Radio Direction Finders) Rules, 19o8, during such time when radio bearings at 2 being deter- mined by means of the direction finder it—

(a) it has been provided by test that the aerial of the radio telegraph auto-alarrn equipment, when in operation affects the accuracy of radio bearings obtain- ed by means of the direction finder; and

(b) it is impracticable to erect an, aerial for the radio telegraph auto-alarm equip- ment in any position on the ship with- out affecting the accuracy of these bearings when the equipment is in ope- ration.

18. Watch keeping and other radio duties of radio officers.—(1) Every radio officer on board a radio telegraph ship shall keep radio watch by means or headphone reception throughout his period of duty except when another radio officer keeps radio watch by headphone reception :

Provided that when the radio officer is re- quired to perform other duties in comp- liance with these rules or in compliance with the Merchant Shipping (Radio Direction Finders) Rules, 1968, or when he is required to handle traffic on other frequencies radio watch may be maintained by means of loud spea- ker reception or if loud speaker recep- tion is impracticable radio watdi dur- ing such period may be dispensed with except during silence periods falling within such period.

(2) (i) Subject to the provisions of rule 17, every radio officer on board a radio telegraph ship, being a ship which is provided with an auto-alarm equipment complying with the requirements of the Seventh Schedule shall, whenever, radio watch ceases to be maintained either during or at the end of his period of duty, connect the radio tele- graph auto-alarm equipment with the ship's main aerial or with any other efficient aerial aad put the radio telegraph auto-alarm equipment into operation.

(ii) Every radio officer wh!o, in compliance with the provisjoas of this sub-rule leaves the radio telegraph auto-alarm equipment in operation when he goes off duty, shall, before going off duty—

(a) test the efficiency of the radio telegraph

auto-alarm equipment;

(b) inform the master or the officer in charge of the navigation of the ship immediate- ly if it is found on test that the radio telegraph auto-alarm equipment is not operating effectively.

(3) Every radio officer who on resuming duty finds that the radio telegraph auto-alarm equip- ment is connected to an aerial, shall immediately test the efficiency of the equipment before making any adjustment thereto.

(4) While a radio telegraph ship is at sea, the radio officer or. if there are more than one such officer on board the ship, the first radio officer, shall cause the following tests to be made :—

(a) a test, once a day, of tho reserve tele- graph transmitter connected with the artificial aerial provided in, accordance with paragraph 12 of Part III of the First Schedule ;

(b) a test, once during every voyage, if the ship is engaged on international voya- ges, of the reserve radio telegraph trans- mitter connected with the reserve aerial, if any ;

(c) a test, once a day by volt meter, and once a month by hydrometer, of any batteries which are a source of electri- cal energy for the radio telegraph instal- lations ;

(d) a test, once a day, of any other source of electrical energy provided for the re- serve radio telegraph equipment ;

(e) a test, once a day, of the audible alarm circuits and of the bells forming part of the radio telegraph auto-alarm equip- ment; and

(f) a test, once a day, to check the proper functioning of the radio telegraph auto- alarm receiver connected to its normal aerial, by listening to signals received by means of that receiver and by com- paring them with similar signals receiv- ed on a frequency of 500 KHz by means of the main receiver; and

(g) a test, at least once a week, of the trans- mitter forming a part of the fixed radio equipment for motor lifeboats, if any, or of the portable radio equipment for

survival crafts, using its artificial aerial.

(5) (a) While a radio telegraph ship is at sea, the radio officer or. if there are more than one such officer on board the ship, the first radio ofli-

cer shall take all reasonable and practicable steps Lo cause the radio telegraph installation and every part thereof to be properly maintained and, where necessary, repaired and adjusted.

(b) The said radio officer shall also arrange for all batteries, being a source of electrical energy i'or any part of the radio telegraph equipment, which arc found not to be fully charged to be brought up to that condition as soon as possible.

19. Restriction in the use of reserve transmi- tter.—The transmitter forming part of the reserve radio telegraph equipment shall not be used to transmit messages other than those relating to the safety of life at sea, unless such transmitter comp- lies with the additional requirements specified in paragraph 6 of Part III of the First Schedule.

20. Radio Telegraph log.—(1) A radio tele- graph log in the form specified in the Ninth Sche- dule shall be kept in the radio telegraph room on board every radio telegraph ship registered in India and jt shall be available for inspection by any person authorised in that behalf by the Central Government.

(2) Every radio officer on board a radio tele- graph ship registered in India shall when on duty, enter the following particulars in the radio tele- graph log required to be kept under sub-rule (1), namely :—

(a) his name ;

(b) the hours at which he goes on and off

duty ;

(c) the identifying number of each message transmitted or received by him together with date and time of such transmission or reception, the station to which each message was transmitted or, as the case may be, from where each such messages was received ; and

(d) a record of all incidents occuring during his period of duty which relate co the radio telegraph installation and the operation thereof and which appear to be of importance to the safety of life at sea and in particular the radio officer shall enter the following in the radio log as they occur together with the time of their occurrence, namely :—

(i) the full text of all messages trans- mitted or received by him which re- late to immediate assistance required by persons in distress at or above the sea;

(ii) the full text of all messages trans- mitted or received bv him which are preceded by an urgency signal or a Safety Signal if no record of such messages is kept separately ;

(iii) a record of the radio watch main- tained by him during each of the silence periods ;

(iv) a record of any incidents occuring during his period of duty which alfects the efficiency of the radio telegraph installation ; and

(v) a record of the tests conducted by him in accordance with the requirements of sub-rules (2) and (3) of rule 18 together with the results of such tests.

(3) The radio officer, or, the first radio officer where there are more than one radio officers on board a ship, shall cause the following entries to be made in the radio telegraph log—

(a) a record of tests conducted in accord- ance with the provisions of sub-rule (4) of rule IS and sub-rule (1) of rule 31 ;

(b) a record" of the charging of any batteries used as a source of electrical energy for the radio telegraph installation as re- quired by sub-rule (5) of rule 18 ; and

(c) the details of any failures and repairs of the radio telegraph auto-alarm equip- ment, if the ship is provided with such an equipment.

(4) The radio officer, or the first radio officer if there are more than one radio officers on board a ship, shall make or cause to make an entry in the radio telegraph log, recording the time shown by the clock in each radio telegraph room in com- parision with Greenwich Mean Time and of any correction made in respect of that clock, at least once a day.

(5) The radio officer, or the first radio officer if there are more than one radio officers on board a ship, shall, unless the ships rules require other- wise, make or cause to make an entry in the radio telegraph log recording in longitude and lati- tude, or by reference to a place, the approximate position of the ship once a day.

(6) The radio officer, or, the first radio officer if there are more than one radio officeis on board a ship, the first radio officer shall inspect and sign each day, the entries made in the radio telegraph log on that day, or, if this is not possible, on the following day.

(7) The master of the ship shall inspect and

sign each day entries in the radio telegraph log.

(8) The provisions of sections 215, 216 and 217 of the Act shall apply to radio telegraph log in the same manner as they apply to an official log.

PART—III

RADIO TELEGRAPHY

21. Aerial.—(1) Every radio telephone ship shall be fitted with an aerial and, in addition, shall carry :—•

(a) a spare aerial completely assembled for rapid replacement of the main aerial, if the main aerial is a supported wire aerial;

(b) a spare aerial complete with supporting structures and capable of rapid erection while the ship is at sea, if the main aerial is not a supported wire aerial.

(2) fa) Each of the halyards used for support-

ing the aerial on a radio telephone ship of Class', III shall be fitted with a safety loop between the masthead or other aerial support and a aerial insulator.

(b) Such safety loop shall consist of a part of the halyard not less than 92 centimetres long, the loop being closed by a link not more than 38 centimetres long with a breaking load not more than one-third of the breaking load of the aerial or the halyard, whichever is less.

(3) A rigging plan of the fitted aerial shall be available on board every radio telephone ship and such plan shall show :—

(a) elevation and plan views of the aerial;

(b) the measurements of the aerial; and

(c) the heigh of the aerial in metres mea- sured in the manner specified in sub- rule (3) of rule 22.

22. Range of transmitters.—(1) The normal range of a radio telephone transmitter provided in accordance with the foregoing provisions of these rules shall not be less than 242 kilometres.

(2) For the purposes of these rules the normal range of a radio telephone transmitter shall be determined at the option of the owner of the ship either by calculation or by test.

(3) (i) For the purposes of these rules, the normal range of a radio telephone transmitter, when determined by calculation on a frequency of 2182 KHz, shall be calculated by ascertaining the product of the root mean square current in ampers at the base of the aerial and the maxi- mum height of the aerial measured from the lead out insulator.

(ii) The! transmitting shall be deemed to comply with the requirements of this rule if the product so ascertained is not less than.—

(2) 7.5 metre-amperes if the aerial has a horizontal top-length of not less than one-hal of its maximum height mea- sured from the lead-out insulator; or

(b) 12.8 metre-amperes in the case of any

other aerial.

(4) The normal range of a radio tele- phone transmitter, when determined by test, shall be the distance to which signals can be transmit- ted by such transmitter over the sea by day under normal conditions on a frequency of 2182 KHz so as to set up at the receiver by the un- modulated carrier a total root mean square field strength of at least 25 microvolts per metre.

23. Supply of electrical energy.—(1) (i) In every radio telephone ship a supply of electrical energy shall be available from the ship's main source of electrical energy at all times while such ship is at sea and at all reasonable times while it is in port and such supply of electrical energy shall be adequate for :—

(a) the operation of the radio telephone installation provided in accordance with these rules;

(b) testing purposes; and

(c) the charging of any batteries which are a source of electrical energy for the radio telephone installation.

(ii) Such supply of electrical energy when it is a direct supply shall be of the correct polarity and a metre to indicate this shall be fixed in a radio telephone ship close to the battery charg- ing switch board, unless provided otherwise.

2 (a) A reserve source of electrical energy

shall be provided :-—

(i) in every radio telephone ship of Class III in which the radio telephone instal- lation is installed on or after the 1st September, 1956; and

(ii) in every radio telephone ship of Class IV in which the radio telephone instal- lation is other than an existing instal- lation.

(b) Such reserve source of electrical energy shall be placed as high in the ship as practicable unless the main source cf electrical energy is so situated and it shall be of such capacity as to be able to supply electrical energy for six hours con- tinuous operation ol' the following consumption requirements, namely :—

(\) one-half of the current required to ope- rate the radio telephone transmitter for the transmission of speck;

(ii) the current required to opsrate the radio

telephone leceiver; and

(iii) the current required by the electric lamp provided in pursuance of rule 24.

(3) (i) If a single battery is provided as a mean of main or icserve electrical energy for operating the radio telephone installation, means shall also be provided for cither :—

(a) operating the radio telephone installa- tion from the ship's main source ot electrical energy; or

(b) float-charging the battery, in which case there shall be adequate protection against voltage rise.

(ii) Such means shall be so designed as not to require the earthing of the ship's main source of electrical energy and adequate filtering shall, where necessarv be provided to prevent mains- borne interference from entering the radio equip- ment.

(4) The reserve source of electrical energy provided in pursuance of sub-rule (2) shall not be used at any time except for the operation of—

(a) the radio telephone installation; and

(b) the electric lamp provided in pur-

suance of rule 24.

(5) Notwithstanding the provisions of sub- rule (4), the reserve source of electrical energy provided in compliance with sub-rule (2) may, if the Central Government so permits, be used to supply electrical energy to—

(a) a direction finder, if fitted; and

(b) low-power emergency circuits which are wholly confined to the upper part of the ship.

(6) Any battery provided for the radio tele- phone installation shall, when not in use, be capable of being fully charged within a period of not more than 16 hours by means of charging provided on board the ship under rule 8.

24. Miscellaneous requirements.—The follow- ing provisions shall apply to every radio telephone ship, namely :—

(a) The radio telephone installation shall be

installed—-

("0 as high in the ship as practicable: and

(ii) in a position where there is least disturbance by extraneous noise or otherwise to the effective reception of radio signals.

(b) An efficient two-way means of a com- munication independent of the ship's main communication system and of main source of electrical energy, shall be provided between the place at which the radio telephone installation is ins- talled and the place from which the ship is normally navigated.

(c) A reliable clock shall be securely mount- ed in such a position that the entire dial can be easily and accurately observed from the operating position of the radio telephone installation.

(d) (i) A reliable emergency lamp shall be provided which shall be independent of the main lighting system of the ship, and it shall be so arranged as to be capable of providing adequate illumination of the radio telephone installation, the clock required by clause (c), and the card of instruc- tion required by clause (e).

(ii) Where a reserve source of electrical energy is provided in compliance with rule 23, the emergency lamp shall be an electric lamp operated from the aforesaid emergency source of elec- tric energy and it shall be controlled bv two-way switches placed respec- tively near the entrance to radio telephone room and at the operating position of the radio telephone ins-

tallation in that room.

(in) The said switches shall be clearly labelled to indicate their purpose.

(e) A card of instructions giving a clear summary of the radio telephone distress, urgency and safety procedures shall be displaced in full view of the radio tele- phone operating position.

(f) Tlie tools, the measuring instruments, spare parts and other materials specified in Part TT of the Sixth Schedule shall be provided and so kept as to be readily available for use at any time while the ship is at sea.

25. Provisions and qualifications of radio tele- phone operators.—(1) Every radio telephone ship shall be provided with at least one radio telephone operator.

(2) For the purposes of these rules, no per- son shall be deemed qualified for being ap- pointed as a radio telephone operator on board an Tndian ship unless he holds a First Class or Second Class or Special Class Radio Telegraph Operator's Certificate of Proficiency or Compe- tency or Radio Telegraph Operator's Certificate of Proficiency or Competency and a valid licence to operate wireless telegraphy granted by—

(i) the Central Government or any other person authorised bv it in this behalf by a notification in the Official Gazette; or

(ii)) the administration of anv other coun- try provided that the Central Govern-

ment has recognised that Ccruiicate oi Proficiency in ladio telegraphy or ra- dio telephony us equivalent to Certi- ficate ot Proficiency of the same class issued by it and has issued to the hol- der an authority to operate radio tele- graph or radio telephone ship station of Indian Registry.

(3) For the purpose of sub-rule (2), no licence to operate wireless telegraphy shall bv deemed to be valid at any date unless it satisfies the relevant conditions of validity and revalidation of such licences specified in the Indian Wireless Telegraph (Commerical Radio Operators Certi- ficate of Proficiency and Licence to operate Wireless Telegraphy) Rules, 195\.

26. Radio watch.—(1) Subject to the pro- visions of sub-rule (2), a continuous radio watch shall be maintained while a radio telephone ship is at sea, by radio telephone operator or if such station is situated at such position in the ship from which the ship is normally navigated Ihen by the master or such other officer or member of the crew who in either co^e is a qualified radio telephone operator and is so appointed in this behalf.

(2) The radii) watch may be discontinued —

(a) when the receiver forming part of the radio telephone installation required by rule 4 is being used for traffic on a frequency other than 2182 KHz and a second receiver complying with the requirements specified in Part Til of the Second Schedule is not a\ailable; or

(b) when, in the opinion of the master of the ship, the conditions are such that the maintenance of radio watch may inferefer with the safe navigation of the ship.

(3) Notwithstanding the provisions of clause (b) of sub-rule (2), the radio watch shall, as far as practicable, b? maintained during siLncc periods.

27. Duties of radio telephone operators. -(\) Every radio telephone operator shall be fami- liar with the radio telephone distress, urgencv and saftey procedures as outlined in the card of instructions under clause (e) of rule 24.

(2) While a radio telephone ship is at s~a, the radio telephone operator or, if there ire more than one such operators on board, Hie one designated in this behalf by th? master of the ship, shall arrange for any battens which are a source of electrical energy for the radio telephone installation to be tested once a day and brought up io iully charged condition as soon as possible.

(3) While a radio telephone ship is at sea, the radio telephone operator, or, if there arc more than one such operators on board, the one designated in (his behalf by the master of the ship may make or cause to be made a test, at least once a week, of the transmitter forming part of the portable radio equipment for survi- val craft using its artificial aeiial.

28. Radio telephone log—(, 1) A radio tele- phone log, in the form specified in the Tenth Schedule, shall be kept in the radio telephone room or at the place from where radio watch is maintained on board every radio telephone ship registered in India and it shall be available for inspection by any other per<\>n authorised in that behalf by the Central Government.

(2) Every radio telephone operator shall, when keeping radio watch under sub-rule (1) or rule 26, enter the following in the radio log as they occur together wiii the time of their occurrences, namely :—

(a) his name;

(b) the times at which he begins and ends

his period of radio watch;

(c) the times at which the radio watch is discontinued and again resumed to- gether with reasons for which the ra- dio watch was discontinued.

(d) a summary of communication ex- changed between the ship station and other stations whether on land or on ships;

(e) a record of all incidents occuring his period of radio watch which relate to the radio telephone installation and the operation thereof nr which appear to him to be of importance to the safety of life at v a; in particular, he shall enter the following in the radio log as they occur together with the time of their occurrence, namely :—

fi) the general sense of all messages trans- mitted and received bv him which re- late to immediate assistance required by persons in distress at or above the sea;

(ii) the general sense of all messages trans- mitted and received by him which ore preceded by a sign >! in general inter- national use as an urgency signal or a safety signal;

(in) a record of the radio watch maintained by him during each of the silence period;

1171 GT/82—7

(iv) a record of any incident, occurring during his psriod of radio wjteli which affects, or in his opinion is likely to affect the efficiency of ihe radio telephone installations; and

(v) a record in latitude and longitude, or by reference to a plaa*, of the approxi- mate position ol the ship at lea;>t once a day.

(3) Every radio telephone operator shall enter in the radio telephone log ,1 record of the test; conducted by him in accordance with sub-rule (2) of rule 27 and sub-rub (2) of rule 31.

(4) The master or any other officer or any member of the crew shall, when keeping radio watch under sub-rule (1) of rule 26, enter in the radio telephone log the following particulars, namely :—

(a) his name;

(b) the times at which he begins and end*;

his periods of radio watch;

(c) the times at which the radio watch is discondtinued and again resumed to- gether with the reasons for which radio watch was ui.v.ontijuied:

(d) a record of all incidents occurring dur- ing his period oi watch which relate to the radio telephone installation and the operation thereof or which appear to him to be of importance to the safety of life at sea; in particular he shall enter the following in the radio log ;is they occur together with the time of their occurrence, namely :—

(i) the general sense of all message received by him which relate to immediate as- sistanc required by persons in distress at or above the sea;

(ii) the genera] seiv~c of all messages re- ceived by him which are preceded b> a signal in general international use as an urgency signal or a saftey signal;

(iii) a record of any incident occurring dur- ing his period of radio watch which affects the efficiency of the radio tele- phone installation; and

(iv) a record in latitude and longitude, of by reference to a place, of the approxi- mate position of the ship at least once a day when Ihe station is open, if the ship's rules so permit.

(5) The radio telephone operator, or if there are more than one such operators on board, the one designated in this behalf by the master of the ship, shall inspect and sign each dny the entries for that day made in the radio telephone log.

(0) The master of the ship shall inspect and

!:jgn day's entries in the radio telephone log.

(7) The provisions of section-* 215, 216 and 217 of the Act shall apply to radio telephone log in the like manner as they apply to ;m oilicial log.

PART IV

RADIO REQUTREMhNT FOR MOTOR UKfc- BOAT AND SURVIVAL CRAFT

29. Fixed radio telegraph installation for mo- tor lifeboat.—• (1) Ihe equipment required by rule 56 of the Merchant Shipping (Life Saving Appliances) Rules, 1982 shall comply with the specifications set forth in Part I of' the Fourth Schedule.

(2) The battery includtd in such equipment shall not bs used for any purpose either lhan the operation of the equipment and of the search light provided in compliance with the aforesaid rules.

30. Portable radio equipment for survival craft.— The equipment required by rule 65 of the Merchant Shipping ;Lilc Saving Appliances) Rules, 1981 shall comply with the specifications set forth in Part II of the Fourth Schedule.

31. Test of radio equipment for motor life- boat and survival crai't— (1) When a ladio telegraph ship provided with the equipment le- ferred to in rule 29 or, as the case may be, rule 30, is at sea, the radio officer or, if there are more than one such ofticeiN on board the ship. the first radio officer shall, at least once a wejk, arrange for the transmitter forming part of such installation or equipment to be Tested with its artificial aerial and also arrange for any batte- ries, other than self-prn u'ng batteries, which are a source of electrical energy for such installation or equipment, to be tesrjj by voltmeter and hy- drometer and brought up to fully charged condi- tion as soon as possible.

(2) When a radio telephone ship provided with the equipment refeired to in nil- 30 is at sea, the radio telephone operator, or if there are more than one such operators on board the ship, the one designated by th? master of the chip in this behalf, shall, at lea-t once a week, airange for the transmitter forming pml of such equip- ment to be tested with its artificial aerial

32. Certain contraventions etc. not to be off- ences.— Notwithstanding the retrospective ope- ration of these rules in respect of clause (vii) of rule 2, no contravention of or failure to comply with any of the provisions of these rules which has relation to the said clause (vii) of rule 2

occurred on or after the 25lh day of May I()(i5, and the date of coming into force of these inks shall render any person guilty of any offence under the Act.

THE FIRST SCHEDULE

(See rules 4, 10(9>. 18(4) and 1CM

RADIO TELEGRAPH INSTALLATION

PART 1—MAIN RADIO TELEGRAPH TRANSMITTER

1. General.— (1) I ho main raJio telegiaph transmitter (hereafter in this Part referred to ,is "the transmitter") shall bo provided with any equipment which may L; necessary to enable H to be operated from the supply of eneig} i d u- red to in rule 13, and Jia'l be capable of b.mg quickly connected with and tuned to be main and reserve aerials releiied to in tul^ 11

(2) The requirement of this Part 'liall be n-1 tor a range of supply \oluue variations ot plus and minus 10 per CCJH lelat've to the nominal supply voltage.

(3) The tiansmiticr slnll not cau^ the ship's

mains to be earthed.

2. Frequency Hinges and classes ot cmis

sions.—The transmitter sb ill be capable ot ad- justment tor transmission emissions as jpay 1 required in the frequency range 405 KHz to 535 KHz of emissions of the following classes- namely :—

Class A 1

Class A 2 Class H (Upper side band only)

3. Transmitting frequencies— The UansmiUoi shall be capable of transmityi^ continuous]} hut not simultaneously, ruoi'i tdeeiayth Minriis on the spot frequencies of 500 KHz, 410 KHz nnd 513 KHz and on two of the following spot¹ i\\- quencies :—

425 KHz, 454 KHz, 46S KHz and 480 KHz

4. Range of load impedance—The transmit!, T shall be capable of complying with all the re- quirements of this Part when" connected 1o an artificial load, one side of which is earthed, con- sisting ot a resistance ol value R in scries with a capacitance of value C in all of ihc combina- tions specified in the foliov ing Table ; —

TABLH

C. 300 400 500 600 750 Pico-

faiads

R. 3 6 28 22 2 19 Ohm? (non inductive) —

5. Power of tiansmiiter— (1) For tne pur- poses of this paragraph, tlu expression "the po- wer of the transmitter" means the total power developed in the artificial load specified in para- giapli 4 during a period when the transmitting key is depressed and docs not include power dis- sipated in any compencnt forming part of the Uansinitter.

(2) The maximum power of the transmitter shall not be less than W watts at any frequency within its range, W being determined by the formula :—

W-100 1 \V=IOO f

', I +500

I 1 500 f

~~ t J

whore T is the frequency in KHz per second at uhn.li Ihe test is made.

(3) The transmitter shall be so designed that its power can be reduced, either continuously or in steps of not more than six decibels to a power 2 watts and 9 watts.

(4) When adjusted to develop maximum po- wer in accordance with sub-paragraph (2) or to reduce power in accoidance with sub-paragraph (3), the tiansmitter shall bo capable ol —

(a) continuous operation tor th • transmis- sion ol radiolelcgiapli signals at any speed upon ilie maximum signals at any speed upto tht maximum specified in paragraph J', and

(b) operation under steady marking or spacing conditions for a period of not Jess than fifteen minutes.

6. Depth of modulation.— The depth of modulation when the trsnsmitter is transmitting Class A2 emissions shall h i-

fi) not less than SO and not moie than 95 per cent when the power ot the tians- mitter is 25 watts or more;

(?' no less than 70 and not more than 95 per cent cent when Ihe power of the transmitter is less than 25 watts.

7. Note frequency.- - The note lrequency of the transmitter shall not be less than 450 Hz and not more than 1350 Hz.

8. Speed of transmission.—- The transmitter shall be capable of tian .mining telegraph signals at all speeds upto 30 words without critical relay adjustment.

9. Frequency stability. —The transmitter shall be capable of maintaining a frequency tolerance of 1000 parts in 106 relative to nominal fre- quency throughout eveiy transmission withom adjustment of controls, notwithstanding varia tions of the impedance of the aerial or any othei load to which i( is connected, or variation ol supply voltage within plus or minus 10 percent,

10. Spurious and Harmonic components in the output signal. —(1) The output power ot any spurious emission shall not exceed a level ol' 40 DB below the carrier power or 20 milliwatts whichever is less. For this purpose, the 'spurious' shall include harmonies of- the carrier frequency and intermodulation products but not compon- ents which are a result ot the modulation process.

(2) When sending morse dots at speeds up*o 3U words, 95 per cent oi the total power jadiated shall be within a band not wider relative to riic frequency of the steady-state carrier, than plus and minus 100 Hz for class Al emissions and plus and minus 1500 HZ for class HZ emissions.

11. Operating facilities.—- (1) The transmit:i shall be so arranged thai- the adjustments neces- sary to change it from operation on any one of the frequencies required by paragraph 3 lo ope- rate on any other of such frequencies can bo made by one operator i,i a period not exceeding 10 seconds.

(2) The transmitter shall be capable of being operated on full power within 60 seconds after any part of the transmiti-er has bc?n first Switch- ed on.

(3) [f the transmitter is so designed and con- structed that it is necessary to delay the applica- tion of certain voltages for a period after it has been switched on, the delay shall be automati- cally provided for by a delay switch.

(4) The transmitter shall be capable of being used in conjunction wi'h aii auiomalic keying device specified in Part V.

12. Protective arrangement,— The transmitter shall be so designed and constmcled that when the transmitting key is df-pres^ed the aerial can be disconnected or the output can be short-cir- cuited without damage being caused to any pail of the transmitter. Mean, shall 1>: provided for protecting the transmitters from damage caused by excessive current or \t\T.aft\

13. Artificial aerial.-- Aa artificial aerhl shall be provided which shall include in indi- cator or lamp to indicate the passage of radio frequency currents, and shall b^ suitable for test- ing the transmitter on full power

14. Indicating Instruments.— The m;iin trans- mitter shall be equipped with suitable indicating instruments of approved accuracy to measure (1) the current in the antenm circuit, (2) the poten- tial of the heating current applied to the cathode or cathode heater of each electron tube or a potential directly proportional thereto, and (3) the anode current of the radio frequency oscila- tor or amplifier which supplied power to the antenna circuit, or, in liesi thereof, the anode current of such oscillator or amplifier plus the anode current of any other radio or audio frequency oscillators(s) or empilifier(s) normally employed as part of the transmitter.

15. Additional safeguards to be incorporated vhere the transmitter includes Semi-Conductor De- vices.—(1) Where semi-conductor devices are in- corporated in the transmitter, the following re- quirements shall be met, namely :—

(a) Under all conditions of service, the ma- ker's maximum ratings for each type of semi-conductor device shall not in any respect be disregarded. In particular, the maker's recommended maximum junc- tion temperature and never be exceed- ed.

(b) The semi-conductor devices shall be effectively protected from damage if the power supply is subject to transient voltage changes.

(c) Means shall be incorporated for the pro- tection of the semi-conductor devices from damage due to the accidental re- versal of power supply polarity.

(2) The semi-conductor devices shall be ade- quately screened and filtered for protection from damage due to Radio Frequency Energy.

PART II—MAIN RADIO TELEGRAPH RECEIVER

I. General.—(1) The main radie telegraph

receiver (hereafter in this Part referred to as the "receiver") may consist of a single unit or of se- parate units, ea^ch of which is capable of recep- tion on one or more of sections of the frequency range specified in paragraph 2 of this Part, and shall be capable ot being quickly connected with the main and reserve aerials referred in rule 11. The receiver shall be capable of being operated from the source of electrical energy refered to in sub-rule (1), of rule 13 and shall not cause the ship's mains to be earthed.

(2) Each unit of the receiver shall bcor a plate stating the frequency range it is intended to cover.

(3) The receiver shall not bo constructed for operation in whole or in part from energy sup-

lied by dry batteries.

2. Frequency range and types of emission.— The receiver shall be capable of receiving sig- nals within the frequency ranges and of the types specified in the following Table :—

TABLE

Frequency range

Type of emission

100 to 160 KHz (inclusive) — A1

160 to 1500 Khz

— Al, A2, A2H

Type of emission Frequency r..uige

— AJ, \2, A\ AJH, ATA, 1.5 to 4 MHz (inclusive)

A 3.1

— Al, A2, A"!, A3H, A3 \, 4 to 23 KHz (inclusive)

A3J

Al, -\2, M, A3'I. A1A, 25 IO 275 Mil/ (inclusive)

A JJ

3. Reception facilities.—(1) The receiver shall be capable of headphone and loudspeaker recep- tion throughout the frequency ranges specified in paragraph 2 of this Part.

(2) The loudspeaker shall be rendered in opt-

rative when reception is by headphones.

4. Controls.-—-The receiver shall be provided

witty—

(1) a separate radio-frequency and audio-fre-

quency gain controls ;

(2) a means for reducing the receiver fain when the transmitting key of the transmitter is depres- sed, so that signals may be heard without incon- venience to the operator or damage to the recei- ver when the transmitter is keyed at signalling speeds upto 30 words per minute;

(3) a switch for disconnecting the device, if any, for reducing the effect of impulsive noise signal^;

(4) means and tuning controls which permit—•

(a) tuning to any frequency in the same maritime mobile band within 5 seconds and to any other frequency in another maritime mobile hand within 15 seconds.

(b) fine tuning by baudspread or other met- hod, controlled by a knob of at least two inches diameter, the backlash of which shall not exceed one degree and which shall be so geared that, after any backlash has been taken up, a rotation of one degree will not change the fre- qijcncv of tune by more than the -.'mount indicated in the following Table :—

TABIP

Frequency range

Charge of frequent." per deuree

Paris in 104

ICO KHz to 1.5 MHz

3

1.5 MH/ to 25 MHz

1

(5) accurate means of resetting tune; if a logging scale is provided for that purpose one inch on the scale shall correspond to a frequency change of not more than one per cent.

(6) a scale for use with the means of rapid tuning referred to in sub-paragraph (4), the scale shall be calibrated directly in frequency.

5. General method of testing.—The receiver shall comply with the requirements of paragarphs 6 to 17, inclusive, when tested in the following manner, e\cept where another manner oi testing is specified in the said paragraphs :—

(1) An artificial aerial shall be used for the test and shall consist of a 75 OHm non-inductive resistcr if the test is conducted at frequencies above 4 MHz, and a 10 OHm resister in series with a capaciter having any value between 200 and 600 picofarads if the test is conducted at fre- quencies below 4 MHz.

(2) Tvpc A2 signals used in the test shall be modulated to a depth of 30 per cent ana shall have a note frequency of 1000 Hz.

(3) The frequency of the interfering or un- wanted signals applied shall not be rcsiricted to the frequency range of the receiver.

(4) The standard of audio-frequency output level of the receiver for headphone reception shall he one milliwatt into a resistance substantially equal to the moduls of the impedance of the head- phones at 1000 Hz.

(5) The standard audio-frequency output level for loud speaker reception shall be 50 milliwatt into a tesistance substantially equal to the moduls of the impedance of the loudspeaker at 1000 Hz.

6. Selectivity.—Selectivity preceding the final detector of the receiver shall be variable, either continuously or in steps, and shall satisfy the fol- lowing requirements throughout the frequency (ranges specified when the automatic gain con- trol, a.g.c.) is rendered inoperative—

TABLE

Band with selling

wide

Narrow

Inter- mediate

Very narrow

Frequency range

160 KHz to 28 MHz

1.5 MHz to 28 MHz

100 KUi to 28 MH>

100 KHz to 160 KHz

1 5 KHz

4 KHz

0 5 KH7 Discrimination of not more than 6 decibels to be obtain- ed at frequencies removed from tune by

12 KHz KHz

2.5 KHz

0.75 KHz Discrimination of at lea^t 10 decibels to be obtained at all frequencies removed from tune by

24 KHz

12 KHz

5 KHz

S KHz Discrimination of at least 60 decibels to be obtained at all frequencies removed from tune by

Disci imination of at least 50 35 25 25 90 decibels to be obtained KHz KHz KHz KHz at all frequencies from tune by Provided that the discrimination against an interfering signal of frequency than 1.5 MHz need not oxceed 60 decibels.

(2) In a superheterodyne receiver, when the automatic gain control (a.g.c.) is rendered in- operative :—

(a) the image response rations thereof shall not be less than the following :—

Frequency of wanted signals

Image response lalio

K0 decibels

70 decibels

60 decibels

40 decibels

100 to 1,001) kHz 1 to 1.5 MHz 1.5 to 7 MHz 7 tn 15 MHz above 15 MHz

25 decibels.

(b) the intermediate frequency response ra- tios thereof shall not be less than the following •—

Intcimcdi.ite Irequency

Intermediate frequency response ratio

90 decibels

Between 140 and 1,600 KHz

Outside the above limits

60 ditihels

(3) Notwithstanding tiie provisions of sub- paragraph (J ) the very narrow bandwidth setting oi the receiver may be provided by an audio-fre- quency note filter which shall have—

(a) a midband frequency of one kilocycle

per second,

(b) a discrimination of atleast 20 decibels at all frequencies outside a band 700 Hz wide,

and shall be capable of being switched in o> out of circuit at will.

7. Sensitivity.—The standard radio frequency output levels specified in paragraph 5(4) and 5(5) shall be obtained at all bandwidth settings, and with the automatic gain control both on and off, with an input not exceeding the following levels :•—

Frequency

Maximum input for type A2 waves Maximum input for type AI waves

100-J600 30 decibels above one micro volt.

KHz

30 decibels above one micro volt.

20 decibels above one micro volt

160-1500 KHz

20 decibels above one micio volt.

10 decibels above one micro volt

1.5-10 MHz

30 decibels above one micro volt.

20 decibels above one micro vult

10-25 MHz

8. Signal noise ratio.— (1) The signal noise ra- tio of the receiver shall not be less than the ratio specified in the following table, when receiving any signal being cither a type Al signal of a type A2 signal, of the maximum input specified in paragraph 7 when the receiver gain is adjusted to give the standard output the note filter, if any, is switched out of circuit :—

TABLE

1 lequencv

Bandwidth selling Signal/noise ratio

100 KHz to 1.5 intermediate

10 decibels

MH;

Wide

10 decibels 1.5—4 KHz

Wido

20 decibels 4—10 MHz

Wide

26 decibels 10—25

(2) For the purposes of this paragraph spurious

whistles shall be regarded as noise.

9. Automatic gain control. — (1) Tho receiver shall be provided with an automatic gain control, capable ol operating efficiently on types A l, A2, A3H, A3A and A3J waves of all frequencies between 1,500 KHz and 28 MHz and which can be switched out of circuits.

(2) When the leceiver is adjusted to give the standard output with a type A2 input signal 10 decibels above the appropriate maximum input specified in paragraph 7 on any frequency between 1.5 and 25 MHz.

(a) an increase in input of 20 decibels shall result in an improvement in the signal| noise ratio of at least 15 decibels ; and

(b) an increase in input of 60 decibels shall not increase the output by more than 10 decibels.

(3) The charge time constant of the automatic gain control system shall be between .05 and .2 seconds and the discharge time constant thereof shall be between 0.5 and 2 seconds.

10. Output limiting.—An increase in the input

to the receiver by 60 decibels when—

(1 ) the automatic gain control is switched

off ; and

(2) the receiver is adjusted to give the stan- dard output with a type Al input signal 20 decibels above the appropriate maxi- mum input specified in paragraph 7 shall not increase the output by more than 10 decibels.

11. Blocking.—The change in the output of

the receiver shall not exceed 3 decibels when—

(a) fi) the bandwidth is set at "inter-

mediate"',

(ii) the automatic gain control is in opera-

tion,

(iii) standard output with an input wanted signal of type A2 at a level of 60 de- cibels above one mircovolt and of any frequency between 160 KHz and 28 MHz, and

(iv) a type Al input signal of a level of 100 decibels above one microvolt and at a frequency J 0 KH/, above or below the wanted frequency is then simultaneously applies ; or

(b) (i) the bandwidth is set at "narrow",

(ii) the automatic gain control is switched

off,

(iii) the receiver is adjusted to gi\e the standard output with an input wanted signal of type Al at a level 30 deci- bels above one microvolt anil of any frequency between 100 and 160 KHz, and

(iv) a type Al input signal of a level of 70 decibels above the microvolt and at a frequency 5 KHz above or be- low that of the wanted frequency is then simultaneously applied.

12. Cross Modulation.—The receiver shall not produce an output of level higher than 30 deci- bels below the standard output when—

(1) the bandwidth is set at "intermediate",

(2) the automatic gain control is in opera-

tion,

(3) the receiver is adjusted to give the stan- dard output with an input wanted signal of type Al at a level 30 decibels above one microvolt and of any frequency bet- ween 160 KHz and 28 MHz,

(-1) the modulation of the signal is switched

off. and

(5) a type A2 input signal of level 90 dc- cibles above one microvolt and fre- quency 10 KHz above or below the wanted frequency is then simultaneously applied.

13. Tntermodulation and Harmonic Produc- tion.—An output exceeding the standard output shall not be produced by the receiver when—

(a) (i) the band width is set at "intermediate",

fii) the automatic gain control is switch-

ed off,

(iii) the receiver is adjusted to give the standard output with an input want- ed signal of type A2 at a level 30 de- cibels above one microvolt and at any frequency between 160 KHz and 550 KHz.,

(iv) the input wanted signal has been re-

moved, and

(vi anv two interfering signals, one of type Al and the other of type A2 each ot a. level 110 decibels above one microvolt and such frequency as to give no appreciable output when ap- plied alone and of which the irequen- cy difference or frequency sum is the same as the lrcquency of the wanted signal, are then simultaneously ap- plied ; or

(h) (i) the bandwidth is set at "inter-

mediate",

(ii) the automatic gain control is switched

off,

(iii) the receiver is adjusted to give the standard output with an input want- ed signal of type A2 at a level 30 decibels above one microvolt and at any frequency between 280 KHz and 550 KHz,,

(iv) the input wanted signal has been re-

moved, and

(v) a type A2 signal, the frequency ox which is half that of the wanted sig- nal and at a level. 116 decibels above one microvolt, is applied.

14. bidclity.—-The maximum change in level of the output of the receiver shall be less than eight decibels while the modulation frequency of an input signal of constant level and modulation depth is varied continuously from 300 Hz to 2,500 Hz when the bandwidth is set at "wide" for the reception of type A3 waves having a fre- quency above 1,500 KHz. The receiver shall com- ply with the foregoing requirements when the level and modulation depth of the input signal are such that the output of the receiver does not exceed the standard output.

15. Non-Liner Distortion.—With the automa- tic gain control switched on the total harmonic content of the audio-frequency output of the re ccivcr at any output not exceeding the standard output shall nol exceed—

(1) 5 per cent with au input signal of a frequency of one megacycle per second at anv level between 30 decibels and 80 decibels above one microvolt and simultaneously modulated to a depth of 30 per cent at 400 Hz.

(2) 15 per cent with such input signal modu- lated to a depth of 80 per cent, at 400 Hz.

16. Timing drift and stability.—The tuning drift and stability of the receiver shall comply with the following requirements—-

(b) After the receiver has been switched on for 5 minutes the changes of tune fre- quencv during anv period of 5 minutes shall not exceed the value shown in the

second column of the following Table within the frequency ranges shown in the first column thereof—

TABLI.

Frequentv ranges

Maximum ih.inge (parts in 104)

1

100 KHz to 1 5 MHz

1.5 M.H6 to 28 M . I'

J

(b) A change of 5 per cent in any one ot the Assembly voltages to the receiver shall not produce a maximum change ot tune frequency exceeding the \alue shown in the second column of the fol- lowing Table within the fiequcncj ranges shown in the first column thereof—

TABLE

Frequency ran^ei

Maximum change (Paris m 104)

•\

100 KK/ to 1.5 MH/

1 5 MTTzto 2N MH7

I

(c) A change in ambient temperature of 5°C within the range of 0C to 5°C applied after the receiver has been switched on for om hour shall not pro- duce a minimum change of tune fre- quency exceeding the value shown in the second column of the toJlowinjr Table within the frequency ranges shov.n in the first column thereof—

TARFE

Frequenc> ranges

Maximum change (Parts in 104)

10

'lOOKHzto 1 1 MHz

1 5 MHz to 18 MH/

17. Heterodyne note stability.—The heterodyne note stability of the receiver shall be such that,—

(1) the frequency of a heterodyne note which is initially one kilocycle p.r se- cond shall not vary by more than 100 c's when the appropriate input lovel specified in sub-paragraph (2) of para- graph 10 is increased by not moie than 60 decibels ;

(2) it is possible at all input levels within the range specified in sub paragraph (\ ), to obtain a best note of 200 1 > when tuning either towards or away from zero beat.

18. Radiation.—(1) The receiver when in u'ac shall not produced a field exceeding 0 1 micro- volt per metre when measured at a distance of one mile from the receiver.

(2) The receiver shall be deemed to comply with ihc requirements ot sub-paragraph (1) it, w hen—

(a) the receiver is placed centrally in a screened earthed enclosure of dimen- sions at least 1.83 metres cube,

(b) the earth terminal of the receiver is

connected to the inside of the screen,

(c) the seital terminal is connected through in unscreened fourturn rectangular search coil situated within the said en- closure and ot dimensions 30.5 centi- metres square and an unscreened lead to a resistive measuring initiument mounted outside the enclosure and hav- ing its other terminal earthed, and

(d) ihe receiver is then energised and un- screened headphones are connected thereto, the power measured by the measuring instalment docs not exceed 4X ] 0—-10 watts whatever the resistance of the measuring instrument or the ad- justment o! the receiver, notwithstanding that the search coil be short circuited or moved in any way, provided that it does not approach within 152 millimetr- es of the receiver case.

PART—111 -Tlu Reserve Radiotelegraph Trans- mit Ler.

1. General.—(1 ) The reserve radio telegraph transmitter in this Part referred to as "the tans- mitl'r", shall be provid d with all equipment necessary to enable it to operate from the reserve source of enetgy referred to in sub-rule (2) of rule 13, and shall be capable of being quickly to in 'c'.ecl with md turned to the main and reserve aerials referred to in rule 11.

(2) The requirement of this Part of this Sche- dule shall be met for a range of batten' voltage variations of plus 5 and minus 10 per cent rela- tive to the nominal battery voltage.

(3) The transmitter shall not cause ilv ship's

mains to be earthed.

(4) No vibrators or primary cells shall be em-

ployed.

2, Frequency and class of emission —-The trans- milter shall be capable of transmitting class A2 or A2H emissions of the frequency of 500 KHz.

3 Ranee of load impedance •—When connected to ,n artificial load, onj side of which h earthed, consisting of a resistance r>l value R in series with a capacitance of value C, the transmitter shall

meet the requirements of this Part (if this Sche- dule with all combination of R and C specified in the following Table—

TABLl

C 250 300 400 500 f>00 750 Pico- farads

R 4 3.6 2 8 2.2 2 ) .9 Ohms (Non-inikieli\c)

4. Power of transmitter.-—(I) For llic pmrjose of this paragraph the power of the transmitter shall be taken to be the mean power developed in the artificial load during a period uhen the transmitting key is depressed, and shall not in- clude power dissipated in any component forming part of the transmitter.

(2) The power of the transmitter shall not be

less than 15 watts when the source of energy is developing 90 per cent of its rated voltage

(3) When adjusted to develop its nuiMmum

power, the transmitter shall be capable of- -

(a) continuous operation for the transmis- sion of telegraph signals at any speed up to the maximum specified in para- graph 7.

(b) operation under steady marking or stea- dy spacing conditions for a period of not less than 15 minutes,

5. Modulation.—(I) The carrier wave shall be modulated to a depth of not less than 80 per cent and more than 95 per cent.

(2) The harmonic content of the modulating

envelope shall not exceed 30 per ceni.

6. Note frequency.—The note frequency of the

transmitter shall not be less than 450 H/_ or more than 1350 Hz.

7. Speed of transmission.—The transmitter shall be capable of transmitting telegraph signals at all speeds tipto 25 words without critical adjustment relays.

8. Frequency Stability.—-The transmitter shall be capable of maintaining frequency tolerance of plus or minus 1000 parts in 106 throughout every transmission without adjustment of controls not- withstanding variation of the impedance of the aerial or of any other load to which it is connect- ed or variation of supply voltage within phis 5 and minus 10 per cent.

9. Operating Facilities.—(1) The transmitter shall be capable of being operated on full power within six seconds after it has been switched on

(2) The transmitter shall be capable of being used in conjunction with the automatic keying device specified in Part V of this Schedule. 1171 c.i/82—8

10. Protective arrangements.—The transmitter shall be so designed and constructed that when the transmitter is adjusted to develop its maximum power and when the transmitting key is depressed the aerial can be disconnected or the output can be short-circuited without damage being caused to any part of the transmitter.

11. Artificial aerial.—An artificial aerial shall be provided which shall include an indicator or lamp to indicate the passage of radio-frequency currents and shall be suitable for testing the trans- mitter on full power.

12. Meter.—The transmitter shall be provided with an aerial ammeter. Other meters shall be included as necessary to enable the transmitter to be checked and adjusted.

13. Use for Normal Communications.—If the transmitter is used otherwise than in an emer- gency or for the tests required by sub-rule (4) of rule 20. paragraphs 3, 6, 8, 9, 10 and 11 of Part T shall applv in relation to main transmitter.

Part—IV—Reserve Radio telegraph Receiver.

1. General.-—The reserve radio telegraph recov- er Thereafter in this Part referred to ns "the receiver") shall be canahlc of being rapidly con- nected to the reserve aerial referred to in rule 1 ].

2. Frcauencv ranees and classes of emissu.n—•

The receiver shall be capable of receiving—

fa) Class A1, A2 and A2H emissions on freaupneies in the range 250 KHz to 535 KHz ; and

(b) Class A1. A 2. A3. A3H and A3.T emis-

sions on frequencies in the range—

1605 KH7 to 3800 KHz

4063 KHz to 4218 KHz

6200 KHz lo 6357 KHz

S195 KH/ lo R476KH/

12339 KH/ (o 12714 KHz

16460 KHz to 16952 KHz

220OO KH/ to 22400 KHz

25000 KHz to 27J00 KHz

3. Reception facilities,—fl) The receiver shall be capable of headphone reception and loudspea- ker reception throughout the frequency range spe- cified in paragraph 2.

f 2) The loudspeaker shall be rendered inopera-

tive when reception is by headphone.

4. Source of energy.—(1) The receiver shall be capable of operation both from the main source of electrical enrgy required by sub-rule f 1) of rule 13 and the reserve source of electrical ener- gy required by sub-rule (2) of that rule. Arrange- ments for rapidlv changing from one source of supply to the other shall be incorporated.

(2) The receiver shall comply with th; require- ments of paragraphs 7 to 15 notwithstanding varia- tions in the supply voltage within the rang'; of—

(i) plus 5 per cent and minus 10 per cent of the nominal voltage when operated from the reserve source of electrical energy required hy sub-rule (2) of rule 13, and

(ii) plus and minus 10 per cent of the nominal voltage when operated from the main source of electrical energy required bv sub-rule (1) of rule 13 ; and

(iii) the receiver shall not cause ths ship's

mains to be earthed.

5. Controls.—-The receiver shall be provided

with—

(1 ) manual controls as necessary for the adjustment of radio andjor intermediate frequency gain and of audio frequency gain ;

(2) a switch for changing the receiver from operation from the main source of elec- trical energy referred to in sub-rule (1) of rule 13 to the reserve source of electrical energy referred to in sub-rule (2) of that rule ;

(3) a selectivity switch, suitably marked ;

and

(4) means for switching off the automatic gain control and such means may be combined with, the functions of a ser- vice switch.

6. Method of Testing.—The receiver shall com- ply with paragraphs 7 to 15 inclusive when tested in the following manner except where another manner of testing is specified in the said para- graphs :—

(1 ) An artificial aerial shall be used for the test and shall consist of a 10 ohm non-inductive resistor in. series with u capacitor having any value between 200 and 600 picofarads for frequences be- low 4 MHz and a 75 ohm non-inductive resister for frequencies above 4 MHz.

(2) Type A2 signals used in the test shall be modulated to a depth of 30 per cent and shall have a note frequency of 1000 Hz.

(3) The standard audi-frequency output level (hereafter in this Part "referred to as "the standard output") of the receiver shall b e-

ta) for headphone reception one milli- watt into a resistance substantially equal to the modulus of the impend- ance of the headphones at 1000 Hz.

(b) for loudspeaker reception 50 milli- watts into a resistance substantially equal to the modulus of the imped- ance of the loudspeaker at 1000 H/.

7. Selectivity.^ (1 ) The selectivity preceding the final detector shall satisfy the following require- ments and the "wide" and "Narrow" conditions shall be selected by a switch ; --

TABI F

Bandwidth condition

Wide Narrow

Not more thun 6dB discrimina- tion lo he obtaire 1 at fre- quencies removed from tune by

4K Hz (does not 1KT1/ apply lo fre- quencies below 1605 KHz

Discrimination of at least 6dB — 2 KH/.

to be obtained al frequencies removed from tune by

10KHz 7KHz Discrimination of at least 30dB to be obtained at frequencies removed from tune by

6020 KH/ 20 KHz Discrimination of al least 60dB to be obtained at frequencies removed from tune by

(2) The image discrimination and inttri mediate frequency repose ratios of superheteodyne recei- vers shall be not less than the following values :—

(a) Frequency of wanted signpl Image Discrimination

50 d 13

250 KHz to 535 KHz

50 d B

1605 KHz to 3800 KHz

30 d B

4, 6, 8 and 12 MHz bands

20 d B

16 and 22 MHz bands

Minimum J.I". Response (b) Intermediate Frequency

Ratio

140 KHz to 1600 KH/

7d B

outside the above limits

50 d B

8. Sensitivity.—The standard output levels shall be obtained at both bandwidth settings and with automatic gain control both on and off, with in- puts at the undermentioned levels :—

Fiequcncy

Input for class Al emissions

Tnr>ut for class A2 emissions

250 KHz to 515 KHz

30 d B above 1 microvolt

40 d B above 1 microvolt

20 d B above 1 microvolt

1605 KHz to 3K00 KHz

30 d B above 1 microvolt 30 d B above 1 microvolt 20 d B above 1 microvolt

4, 6 and 3 MHz bands

40 d B above 1 microvolt 30 d B above 1 microvolt

12, 16 and 22 MHz bands

9. Signal'Noise Ratio.—With an input signal either class Al or A2, of the level specified in

paragraph K and the receiver gain adjusted to give standard output, the signaljnoise ratio shall be not less than the undermentioned values irres- pective of the bandwidth setting :- -

1 lcqueni}

Minimum sign.il Noise ratio

10 dB

250 kHz lo 51¹* KHz

20d B

ldO5 KHz lo 1800 Mil/

: o dB

4, ft and S MHz bands

25 d B

12, 16 and 22 MHz hands

10. Blocking.—With the bandwidth ->cl to "Wide" and the automatic gain control switched on the change in the out put of ihc receiver shall not exceed 3 decibels when—

(1) the receiver is adjusted to give the standard output when an input nanted signal of type A2 at a level of 60 deci- bels above one microvolt and of any frequency in the ranges specified in paragraph 2, and

(2) a type AI input signal at a level of 90 decibels above one microvolt and at a frequency of 20 Hz above or below thai of the wanted signal is then simul- taneously applied.

11. Cross modulation.—The receiver shall not produce an output of level higher than 20 decibels below the standard output when—

(1) the receiver is adjusted to give the standard output with an input wanted signal of. type A2 at a level of 60 deci- bels above one microvolt and of any frequency in the ranges specified in paragraph 2.

(2) the modulation of the signal is switched

off, and

(3) a type A2 signal at a level of 90 deci- bels above one microvolt and at a frequency 20 KHz above or below that of the wanted signal.

12. Intennodulation.—With the handwidth set to "wide" and the automatic gain control switched off, and ouput exceeding the standard output shall not be produced by the receiver when—

( 1 ) the- receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 40 deci- bels above one microvolt and of any frequency between 250 KHz and 535 KHz.,

(2) the input wanted signal lias been re-

moved, and

5'

(3) any two interfering signals one of type At and the other or. type A2, each at a level of 100 d B above one microvolt and of such frequency as to give no appreciable output when applied alone, are then simultaneously applied.

13. Automatic gain control.—(1) The receiver shall be provided with an automatic gain control, capable ol operating efficiently on signals, of types A2 and A3 at all frequencies in the ranges bet- ween 1605 KHz and 23 MHz.

(2) With a type A2 input signal at the appro- priate level specitied in paragraph S and ot any frequency within the ranges between 1605 KHz arid 23 KHz,—

(a) when the receiver is adjusted to give standard output, an increase in input of 20 dB shall result in an improvement in the signal noise ratio to a value at least 15 dB above the appropriate mini- mum signaljnoise ratio specified in para- graph 9, and

(b) when the receiver is adjusted to give an output 10 dB below standard output an increase imput of 50 db shall not increase the output by more than 10 db.

14. Tuning drift and stability.—The tuning drift and stability of the receiver shall comply with the following requirements :—

(a) After the receiver has been switched on for 5 minutes, the changes of tune fre- quency during any further pnod of 5 minutes shall not exceed the value shown in the second column of the lollowing table within the frequency of the ranges shown in the first column thereof—

TABLE

Frequency

Maximum change (Pails in 104)

250 KHz to 535 KHz

5

1605 KHz to 23 MHz

(b) A change of 5 percent in any one of the supply voltages to the receiver, or, to a power supply unit associated there- with, shall not produce a maximum change of tune frequency exceeding the value shown in the second column of the following Table within the frequen- cy ranges shown in the first column thereof :—

TABLE

Frequency

Maximum Range (Parts in 104)

250 KHz to 535 KHz

5

1603 KH? to 23 MH/

(c) A change in ambient temperature of 5" C within the range O° C to 50 C, applied after the receiver has been switched on for one hour shall not produce a maximum change of lunc trequency exceeding the value shown in the second column of the following Table with the frequency ranges shown in the first column thereof—

TABLE

Frequency

Maximum change (Parts in 10⁴)

250 KHz to 535 KHz

15

5

1605 KHz to 23 MHz

15. Fidelity.—The fidelity of the receiver shall be such that a change in the audio-freqjeucy out- put shall be less than 8 decibels when the modula- tion frequency of the input signal is varied conti- nuously from 300 Hz to 30000 Hz, the level and modulation depth of the input signal being kept constant. For the purposes of this paragraph the input signal may have any level and depth of modulation provided the output of the receiver does not exceed the standard output with the band- width set to 'wide'.

16. Heterodyne Note Stability.—The heterodyne note stability of the receiver shall be such that—

(1) the frequency of a heterodyne note which is initially one KHz shall not< vary by| more than 220 KHz for au in- put signal which is varied over the range of 40 to 90db above one microvolt.

(2) it shall be possible for all input levels within the range specified in sub-para (1) of this paragraph to obtain a beat note of 200 Hz, when tuning either to- wards or away from zero beat.

17. Radiation.—-(1) The receiver when in use shall not produce a field exceeding O.I microvolt per metre when measured at a distance of one mile from the receiver.

(2) The receiver shall be deemed to comply with the requirement of sub-paragraph (1) if, when—

(a) the receiver is placed centrally in a screened earthed enclosure of dimension:, at least 1.83 metres cube,

(b) the earth terminal of the receiver is

connected to the inside of the screen,

(c) the aerial terminal is connected through an unscreened fourturn rectangular search coil situated within the said en- closure and of dimensions 30.5 centi- metres square and an unscreened lead to a resistive measuring instrunjcnl mounted outside the enclosure and hav- ing its other terminal earthed, and

(d) the receiver is then energised and un- screened headphones are connected thereto, the power measured by the measuring instrument docs not exceed 4X 10=10 watts whatever the resistance of the measuring instrument or the ad- justment of the receiver, and notwith- standing that the search coil is short- circuited or moved in any way, without approaching within 152 millimetres of the receiver case.

PART V—AUTOMATIC KEYING DEVICE

1. General.—The automatic keying device (hereafter in this Part referred to as "the device") shall be capable of—

(\) Being coimected in place of the manual transmitting key by efficient means, to—

(a) the main radio telegraph transmitter,

(b) the veserve radio telegraph transmitter,

and

(c) the auto-alarm test signal generator referred to in paragraph 1 of the Seventh Schedule.

(2) When connected to any of the afore-

said equipment—

(a) keying automatically the alarm signal specified in paragraph 3 and imme- diately thereafter stopping and open- ing the keying circuit unless re-set or re-wound ; and

(b) keying automatically the distress call specified in paragraph 4 in such man- ner that if the device is used without attention the automatic keying of the distress call will be repeated once every twelve minutes.

The device shall not be capable of keying any signals other than those specified in para- graphs 3 and 4.

(3) When switched out oi circuit after trans- mission of the distress call, the device shall be capable of being re-set by auto- matic or manual means so that after the device has again been switched into circuit keying shall commence within ten seconds at the beginning of the dis- tress call.

If the re-setting is by manual means the device shall include a means for indi- cating when re-setting is necessary.

2. Alarm Signal.—The alarm signal referred to in sub-paragraph (2) of paragraph ] shall con- sist of twelve-tour second dashes separated by one second spaces, the length of the dashes and spaces being maintained within a tolerance of plus or minus 0.2 second.

3. Distress Call.—(1) The distress call refer- red to in sub-paragraph (2) of paragraph 1 shall consist of the following signals in the following order :—

(a) the radio telegraph distress signal SOS

(3 times) ;

(b) the morse characters for the word DE ;

(c) the morse characters for the Ship's Call

Sign (3 times) ; and

(d) the characters of the distress call shall be keyed at 10 to 16 words per minute, and the total duration of the distress call shall not exceed 90 seconds.

4. Source of .Electrical Energy.—(1) It the device is electrically operated, the source or electri- cal energy by which it is operated shall be the reserve source of electrical energy referred to in sub-rule (2) of rule 13.

(2) The device shall be suitable for operation

by an unskilled person.

THE SECOND SCHEDULE

LSee rules 4(2), 7(2) and 26(2)1

RADIO TELEPHONE INSTALLATION

, PART-I

MAIN RADIO TELEPHONE INSTALLATION

1. Definition :—In this Schedule the expression "the equipment" includes a radio telephone trans- mitter and receiver, and all other equipment neces- sary for the operation of the installation, but does not include an aerial or a source of electrical energy.

2. Frequency Ranges and Classes of Emission:— (1) The equipment shall be capable of transmitting class A3, AH, A3 A and A3J emissions on a fre- quency of 2182 KHz and 2191 KHz and on at least six other frequencies within the frequency range 1600 KHz to 3800 KHz.

(2) The equipment shall be capable of receiving

class A3, A3H, A3 A and A3J, on a frequency oi 2182 KHz and other frequencies in the range 1605 to 3800 KHz.

3. Operating Frequencies :—(1) The trans- mitter shall not be capabJe of being operated other- wise than on spot frequencies specified In the Maritime Mobile Station Licence.

M

(2) The receiver shall be continuously tunable to frequencies in the range 1605 to 3800 KHz in addition to spot frequency reception on 2182 KHz.

(3) Independent selection of transmit and re-

ceive frequencies shall be provided.

4. Power Supply :—(1) The equipment shall be capable of being operated from the supply of electrical energy required by rule 23.

(2) The equipment shall not cause the ship's

mains to be earthed.

(3) If the equipment is designed for operation from ship's mains, the requirements of this Part shall be met for¹ a range of supply voltage variations of plus and minus 10 per cent relative to the no- minal mains voltage.

(4) If the equipment is designed for operation from accumulator battery, the requirements of this Part shall be met tor a range of supply voltage vari- ations of plus 5 and minus 10 per cent relative to the nominal battery voltage.

5. Transmitter :—(1) Selection of any of the transmitter frequencies referred to in paragraph 3 shall be by a single switch or push button.

(2) The transmitter shall comply with the re- quirements specified in this Schedule when con- nected to each of the artificial aerials specified in the following Table :—

TABLE

Frequency range

Artillciul aerials

(All elements In sencf)

i Capacitance

Resistance Ohflms Picofarads

Inductuncc Micro- henry;,

Below 3 MHz

6

250

Above 1 MHz

10

250

8

40

250

(3) The total carrier power delivered by the transmitter to the aforesaid artificial load (not including power dissipated in an aerial tuning in- ductor or any other component forming part of the transmitter) shall on any frequency between 1600 KHz and 3800 KHz be not less than 15 watts and not more than 100 watts, and means shall be provided for reducing such power to a power between 5 watts and 10 watts.

(4) A peak liniiter shall be provided to pre-

vent over-modulation of the transmitter

(5) Tht speech modulation of the transmitter

shall be such that—

(a) the frequency response of the micro- phone and transmitter together shall not

var>' by more than 7.5 decibels from a value which rises at the rate of n deci- bels per octave from 2 .Ml Hz to 2500 Hz.

(b) the response relative to the peak response

shall not be higher than —

(i) minus 20 decibels at all frequencies above 3500 Hz, and not above 5000

Hz; and

(ii) minus 40 decibjis at all frequencies

above 5000 Hz.

(6) The modulating system shall be such that the peak modulation of the transmitter lies bet- ween 80 and 95 per cent for any sound pressiue the root mean square value ol which measured in the plane of the microphone mouthpiece with a pure wave of 1000 Hz, lies between n.5 dynes and 100 dynes per square eentimcUr.

(7) With the transmitter operating at its rated

power or below and iikiJuJatea to a depth of 90 per cent by a sinusoidal wave of frequency 1000 Hz applied to the microphone terminals and with the peak limiter rendered inoperative, the har- monic content of the modulated output voltage shall not exceed 10 per cent.

(8) The transmitter shall be capable of main-

taining a frequency tolerance of -—

(i) 200 parts in 10 for DSB operatives:

(ii) 100 /. for SSB operations.

throughout every Iransmiv-'oi within llie range of 1605 KHz to 3800 KHz without adjustment of any control notwithstanding variations of the im- pendance of the aerial of other lead to which it is connected, or variations of supply voltage within plus or minus 10 per cent.

(9){a) The radio-lrequeruy output of the transmitter shall be free from frequency components due to spurious oscillations in any part of the equipment:

(b) The output power at any harmonic of the radio-frequency shall not exceed 2.1 watt;

(c) With the microphone opjn or short-cir-

cuited —

(i) the total noise and hum power in the output wave shall be at least 40 deci- bels below the carrier power;

(ii) the total noise and hum power con- tained in the side-bands correspon- ding to audio-frequencies between the limits of 250 Hz and 300 }\i shall be at least 40 decibels below the carrier power.

(10) The transmitter shall be such that—

(a) in not more than 10 seconds one ope- rator can carry out all such adjustments as are necessary to change the trans- mitter from operation on any one of the frequencies referred to in paragraph 3 to operation on any other ot such fre- quencies;

(b) if the transmitter is so designed and con- structed that it is necessary to delay the application of certain voltages for a pe- riod after it has been switched on, the delay shall be automatically provided by a delay switch; and

(c) an indicator shall show when the trans-

mitter is ready lor operation.

(11) The transmitter shall be so designed and constructed that when it is adjusted for maximum power the aerial may be disconnected or the out- put short-circuited without damage being caused to any part of the installation. Means shall be pro- vided for protecting the transmitter from damage caused by excessive current or voltage.

(12) The transmitter shall be provided with an aerial ammeter. Other meters shall be included, as necessary, to enable the transmitter to be che- cked and adjusted.

6. Receiver :—(1) Mean, shall be provided to enable each of the receiver spot frequencies' re- ferred to in paragraph 3 lo be selected by a single operation.

(2) The receiver shall be capable of both

telephone and loud-speaker reception.

(3) The receiver shall be provided with —

(a) a manual audio-frequency gain control;

and

(b) an automatic gain control capable of efficient operation on type A2 and tjp; A3 waves.

(4) Any peak limiter or other device included in the detector or output circuits of the receiver for the purpose of reducing the effect of impulsive noise signals shall be capable of being discon- nected by means of a ,^/ifch.

(5) The receiver shall comply with the require- ments of sub-paragraphs (6) to (14), inclusive, of this paragraph when tested in the following man- ner, except where another manner of testing is specified in the said sub-paragraphs :—

(a) artificial aerials with the characteristics specified jn the table set forth in sub- paragraph ,(2) of paragraph 5 shall be used for the test;

•-tandard output with an input signal ol type A2 at a level of 30 decibels above one microvolt-—

(b) (ype A2 signals used foi i'w teU shall be modulated to a depth of 30 per cent, with a note frequency of 1000 Hz

(a) an increase in input ot 20 decibels will result in an improvement in the signal¹ noise ratio or at least 15 decibels; and O i s c r i i wr t'On nf n~>\ mnr<* l l i 'i 6 V.ibHs tn In* r>hf ' " T* 1 i t lY'^qiK-icirs rem">vr ' from t m' h"

Discrimin tion of al le"sf 30 decibels In h c o b t u n- 7 ^KH/

cd .t I'M q lenck¹- icm we 1 fiom lunr hv

Discnmiruhon ol 't Vest 60 decibels to Iv

IS KH7

obti i" d 'M (Vi quCKiis lcm^vod from tu'ii- h^

Disciiminmon o f ai I c sl SO di cihuls lo be SO K H/

obt ii led .'.t frcq K icics removed from tune by

Iltei"m'" \i.i'e freq leicv

Intermediate fre quency response ratio

Bo¹ wee 1 140 a I 1 1 600 KH'

SO dt-cibek

Outside the ab IVO limits-

60 decibel-

(b) 15 per cent with an input signal as prescribed in (a) but modulated to a depth of KO per cent at 1000 H/.

(14) Each frequency of tune referred to in paragraph 3 shall be maintained within one H/. per second of its nominal value notwithstanding variation in the supply voltage of plus or minus 10 per cent and notwithstanding ambient tem- perature changes from minus 10'C to plus 40°C.

(15) (a) The receiver shall not in normal service produce a field exceeding 0.1 microvolt per metre when measured at a distance of one mile from the receiver.

(b) The receiver shall be deemed to com- ply with the requirement of sub-para- graph (a) of this paragraph, when—

(i) the receiver is placed centrally in a screened earthed enclosure of dimen- sions 1.83 metres cube;

fii) the earth terminal of the receiver is connected to the inside of the screen;

(iii) the aerial terminal is connected through an unscreened four-turn rectangular search coil situated within the said enclosure of dimen- sions 30.5 centimetres square and an unscreened lead to a resistive mea- suring instrument mounted outside the enclosure and having its other terminal earthed; and

(iv) the receiver is then energised and unscreened headphones are connect- ed thereto, the power measured by trie- measuring instrument does not exceed 4x1 0 — 10 watts whatever the re- sistance of the measuring instrument or the adjustment of the receiver, and notwithstanding that the search coil is short-circuited or moved in any way without approaching within 152 millimetres of the receiver case.

7. Facilities for two-way communication.—

(1) The equipment shall be capable of changing instantaneously from transmitted to receiving and vice versa by means of a pressel or other single switch, aerial change-over relays, and such other devices as are necessary for that purpose. If, in addition, a voice operated device is provided for that purpose the operating lag shall not be less 10 milii-seconds, and the release lag shall not be less than 150 milli-seconds and not more than milli-seconds.

(2) Means shall be provided for protecting the receiver from damages when th? equipment is transmitting.

(3) Means shall be provided to assura auto- matically that at all times when the microphone is in use the loud-speaker is disconnected.

8. Size of Controls.—All controls on the receiver shall be of such size as to permit normal adjustment being performed by a person wearing thick gloves.

PART-II

RADIO TELEPHONE ALARM SIGNAL GENE- RATING DEVICE

1. General.—(1) The Radio telephone Alarm Signal Generating Device (hereafter in this Part referred to as "the device") shall be capable of generating the radio telephone alarm signal spe- cified in paragraph 3 and of being suitably con- nected to a Radio telephone transmitted referred to in Part I of this Schedule.

(2) The device, it designed for operation from the ship's mains shall meet the requirements for a range of supply voltage variations of plus and minus 10 per cent relative to the nominal mains voltage,

(3*> The device, if designed for operation from batteries shall meet the requirements of this Part for a range of supply voltage variations of plus 5 and minus 10 per cent relative to the nominal battery voltage.

(4) The device shall not cause the ship's mains

to be earthed.

2. Performance.—(1) The device shall be ready generate the radio-telephone alarm signal within a ncriod of 30 seconds from the time the device is energised and shall be capable of generating for a period of not less than 30 and not more than 60 seconds.

2) After generating the signal the device shall be readv to repeat the signal after an interval of not more than two minutes.

(3) Means shall be provided so that the device

can be taken out of service at anv time.

(4) It shall be possible to test the device with-

out the eeneration of radio-freauencv energy and shall include a sound reproducer to give an audi- ble reproduction of the generated signal.

(5) The device shall be capable of modulatin

3. Radio Telephone Alarm Signal.—The radio telephone alarm signal referred to in sub-nara- graphs (11 of parasranh 1 shall consist of two substantial^ sinusoidal tones, onr hnvin"- n fv- cuencv of 2200 Hz nlir, or minus 1 5 per rent and the other of 1300 Hz pins or minus 1.5 per