RESOLUTION A.334(IX) adopted on 12 November 1975 …9).pdf · 2020. 12. 21. · A DC/Res. 334 - 2 - 2. F:teguencies and classes of enission 2.1 The radiotelephone transnitter should

RESOLUTION A.334(IX) adopted on 12 November 1975 RECOMMENDATION ON OPERATIONAL STANDARDS FOR RADIOTELEPHONE

TRANSMITTERS AND RECEIVERS

~

I I

:f,;Ti:R-GOVERNMENTAL MARITIME CCNSUL TATIVE ORGANIZATION

1\.S8Ei\.'.IBLY - 9th session Agenda iten 7(c)

Distr. GEHERL\.L

A De/Res. 334 18 Decenber 1975 Original g ENGLISH

IMCO

TIJJSOLUTION A.334(IX) adopted 01112· Uovenber 1975

HECQI.'.IlYIENDATION on OPETI.ATIOH.1.fL STANDARDS FOR HADIOTELEPHOHE TILJ'J:TSlIITTERS AUD RECEIVERS

THE i' .. SSEf'.IBLY,

NOTING Article 16(i) of the Il1CO Convention concernine the functions of the l:i.sseubly1

BEARING IH MIND the provisions of Regulc:-tion 15 of Chapter IV of the Inte1"11.ational Convention for the Safety of Life at Sea, 1960, as anended ,

HL.VIlfG CONSIDE.i.Tu-ir> the Report of the Mari tine Safety Conni ttee 011 its

thirty-second session,

J.J)OPTS the Ilecoonendation on operational standards for radiotelephone

tranrn::tl tters mid recei vcxs annexed to this TI.esolution1

RECOT·'IT··'ICIIDS l\.cluinistrations to ensure that shipborne radiotelephone

t:ransnitters m1d receivers confom to operational standards not inferior to

thos~ specified in the TiocoDnendation.

1:.1:ITT.CX

llECOI-Tf'.ffrNDATIOIT OM OPifilTIOlTAL STACJI>AfillS FOR I'Ju>I~LDPHOIIB TI;;~l:r81,LITTITlS Aliffi nr:cr:rv.r.ns

PL.HT A·

rJillIOTELEPIIONE Tll11'T8IUTTE.TIS

1. Jntroc1uction

The rnc1iotelephone trunoni ttor requirocl by Regu].ation 15 of Chn.pter IT

of the 1960 Safety Conv011tio11.1 as anendod , should conpl.y with the followine

opexational standards.

For reasons of economy, this document is printed in a limited numhe1 De leqates ...,,, are kindly asked to bring their copies to meetings and not to request additional ~opi~s. ·



PBARRETO

Pencil

PBARRETO

Pencil

A DC/Res. 334 - 2 -

2. F:teguencies and classes of enission

2.1 The radiotelephone transnitter should be capable of transmitting

on a nuober of frequencies considered by the ndninistration adequn.te

for the operation of the ship, but in no case on less than 2182 ldiz

and one additional fr~qµel'lc;r ~ th,e bnnds between 1605 and 2850 kHz.

2.2 Frequencies should be designated in tams.of the carrier frequency.

The selected trai1sni.tter freq~ency should be clearly identifiable

on the front of the equippent.

2. 3 (a) The t.rcmsoi tter should be capable of transoi ttL"lg with classes

of enission A31I, 1~311 and A3J*.

(b) When ~,d~chl11g to the distress frequency 2182 kHz the class of

eoission 1l3II should be selected autonaticallY*. Addi tio11ally,

provisions nay be on.de for the use of classes of enission A3A or J."i-3J on 2182 ldiz.

(c) The upper sideband should be used.

2.4 It shoulcl be possible to change the transoitter fron any class of

enission for which it is desic;ned to operate to any other by neans

of a sin(;le control.

2.5 It should be readily possible by use of extemal control to select

transoission frequencies independent of any r~oei-ver setting.

2.6 It should be possible to clw..nee the tra.nsnitter frou operation on

any frequency to operation on &iy other frequency as quickly as

:possible, but in any event within a. period not eJcceedinB' 15 seconds.

1:- The World lhri tine .Mninistrati VO Itadio Conference, Geneva 197 4' instructed CCIR. to study the use of classes of' eoi.ssion A;A cmd A3J for distress a11d safety purposes. This study should be coopleted in tine for a decision by the next conpetent World Aclninistrative Radio Conference on the date for the final conversion to classes of eoission f:..;A and A3J on the. carrier frequency 2182 kHz. Subsequent further consideration of the use of emission A3II ony therefore be required.



- 3 - A IX/Res.334

3. .frequency accuracy D..n.d stability

When the equipnent is at ·nornal opera.ting tenperature, the frequency of

transnissio11 should net chrmee by nore thnn 40 Ilz overa.ny.l5·ninute period.

It should, under the conditions specified in paracrraph 11, be within 100 IIz

of the frequency to which the transuitter is intended to be tuned. For

tra.nspitters to be installed after l Jnnuary 1982 o. value of 50 Hz should apply •

. 4. . Output power

4.1 The naxinun peak e11velop12· power n.t o:ny·frequenoy within the

specified frequenqy range should be between 60 watts and 400 watts.

4.2 If the rated output power exceeds 150 watts :provision should be

rode for reducin5 the output l)OWer to 60 watts or less.

5. · Peruissible \'la.ming-up period

The equipncnt should be capq,ble of operation on 2182 kHz within

30 seconds after switchill(S on.

6. Continuous operation

Continuous opezatdon shoul d be poaatbf,e when the transoi tter is o..djustec1

to develop its rated peck enveJ.ope IJOW~r, when nodula.ted:

(a) ·by the rb.c1iotelephoile aln.rn Si6ll£l.l or an equivalent sieno.l for

at least 15 ninutes, and

(b) with noroal speech.

Controls and indicators

7.1 Provision should bo oade for an antenna current oeter indicator,

or other appropriate device, the .r~-1 ure: of which s.hould not

discom1ect the antenna 9ircuit.

7.2 The equipnent should be .fitted with .n sufficient noober of

indicators to l)eroi t accura+e .and rapid t1.lllll¾3'. ~ nalfunction o! autooatic tuning devices, if .fitted, should not prohibit rapid

p;-oper operation on 2182 kHz.

7. 3 All controls should be of S'1Gh size as to pemi t nornal adjustoonta.

to be easily ,erfomed and the nunber of controls should be the

Dini.nun necessary for satisfactory and sinple operation.



L :ocjnes.334 - 4 -

7 .4 lu.l controls, instruments and indicators should be clearly labelled.

In particular, all oo.justoents and controls necessary for switching

the transnitter to operate on 2182 kHz should -be clearly na.rked in order that this operation nny be readily perfomed.

a. Power supply

8.1 The tronsnitter should continue to operate in accordance with the

operational stando.rds contail1ed in this recoooendation in ·the presei1ce

of variations of the power supply nomally to be expected In a ship.

8.2 Provision should be aade for protecting the transmitter fron the

effects of excessive voltages, transients and reversal of the power

supply.

8. 3 If it is necessary to delo.y the application of voltage, .. £or exaaple anode_ voltage, to any part of the transnitter after switchine on,

the delay should be provided autonatically.

8.4 If the equipnent includes parts which o.re required to be heated in order to operate correctly, for exnnple crysta.l ovens, the power

supplies to the heating circuits should be arranged so that they con

reo.ail'1 operative when other supplies to or within,. the equipnent

are switched off. If a special switch for the heating circuits is

provided, its function should be clearly indicated. The correct

operatin,e teoperature should be reached within a period of

30 Dil1utes o.fter the application of power.

~: Operational standards for sources of energy are under consideration.

9. Radiotelephone alam. si{'l'l.ol

9.1 The tra.nsoitter should be fitted, preferably interno.l.ly, with a radiotelephone ola.rn sieno,1 generator neeting the operational

standards for such equiJ;>Dent.

9.2 It should be possible to interrupt the transoission of the radio

telephone ru..a.rn signal at any tine L~ order to pemi t the ino.ediate

transnission of a distress oessa.ge.



- 5 - f~ De/Res. 334

9.3 It should be possible to transnit the· rndiotelephone alam signal en mv frequency available on the tra.nsnitter.

9.4 Heo..ns of nonitoring trru1snission of the alD.rrl sicnal should be

providecl.

9.5 Means should be provided to test tho trn.nsoitter in conjunction with

the al.arr; oiennl 011 a frequency other than 2182 kHz and usin~ a suitable, well screened artificial antenna.

9. 6 I1eans should be provided to· prevent the accidento.l transnissioii. of

the alarn sicnal.

10. Safety precautions

10.l The .oquii:ment should be so desiGned ~d constructed that when the

transnitter is deliverine full power to the antenna, the transmtter

is protected acainst disconnection of the nntenna or short-circuiting

of a.,ten11a terr.linals, by autor.mtically resetting nero1s if necessary.

10.2 Ifaans should be provided for earthing the case of the tronsDitter

but should not cause DJ.1y teroinal of the source of electrical enerrr:,

to be earthed.

10.3 As far as practicable, accidental access to dl:lll.B'erous voltages

within the equipnc11t should lJe prevented and an approl)riate warnin,a

notice be affixcc1.

11. Dur~bility and resistm1ce to effects. of clinate

The equipnent should continue to operate in accordance with the

ol)erational atcndarda corrbcdried in this re_co~endation, undez the condi tione of sen, states, vibration, hurn.dity nncl chance of tenpe:ro.ture likely to be

o:=:-poriel'rced- in a. ship o

12. Iliscellancous

12.l The tro.nso.itter should be so desicned as to linit b.utual

interfererrce with other electronic equi.pnentr'; particularly

its associated receivers, such that sntisfactory operation is ensured.



PBARRETO

Pencil

A IX/11es.334 - 6 -

12.2 To pemit ~pid change-9ver fron trnnsois~ion to reception when

manual. switclµng is used, t:q.e control for the switching device

should, 'Where practicable, be located on the nicrophone or the

telephone handset.

12.3 For norno.1 speech the depth of nodulo.tion should be at least

70 per cent. Autooa.tic neons should be provided to prevent over

uodulation.

12.4 Equi.pnent should be provided with an exter11al il'ldication of

nanuracture , type DJ:J.d/ or nunbez-,

12.5 Infomation should be provided to enable conpetent nenbers 0£

the ship's stnff to opera.te n.nd naintain the equipnent efficiently.

12.6 The internal parts 0£ the equi.pnerrt should be easily accessible

for inspection and naintena.1.1oe purposes.

PIJ1T :B

TIADI0TELEP1I0l1E HECE:rv.IBRS

1. Introduction

The radiotelephone receiver required by Regulation 15 of Chapter 'DI' 0£ the 1960 Safety Convention, as anended, should conply with the following

operational standards.

2. neguencies nnd class·es of enission

2.1 The receiver should be capable of being tuned throughout the bands

between 1605 and 2850 kHz. Tunine should be continuous, or by

increoental steps; nltematively by the selection of a nunber of

spot frequencies considered by the Adninistrntion adequate· for

the operation of the ship, or by any conbination of these nethods.

The frequency of 2182 kllz should always be included.

2.2 Frequencies sho'Ul.d be designated in te:ros of the carrier frequency.

The frequency to which the receiver is tuned should be cieo.rly

identifiable on the front 0£ the equipnent.

2.3 The receiver should be co.,able of receiving signals of classes of

enission 1~3n, A~ and A3J usins upper sidebond, as well as A3.



- 7 - A rx/nes.334

2.4 The selection of the class of enission should be by neons of a single

control.

2.5 It should be readily possible by use of external contxoi to select

reception frequencies independent of MY tronsru.tte:r;~. set~1:11g !

2. 6 It should be possible to change the receiver fron operation 011 DZlY" frequency to operation on a:ny other frequency as quickly as possible

and in a:ny event within a period not exceeding 15 seconds.

Preguency ste..bility o.rtd a.ccuxa~y of tuni11&

3.1 Under the conditions listed in paragraphs. 10.1 and 12 of these

standards and, if necessary, nft0r an appropriate wo.nti.nc-up

period as ref erred to in 1x~.rai3Taj}h 10. 3 _ tlle difference between the

noninal frequency indicated on the receiver and the o.ctunl tuning

frequency should not exceed:

.- 100 Ifa ,for spot frequency tm1ine, or

- 300 Ilz for other oethods of ti.ming.

Tho frequency drift should not exceed 40 Hz over any period of

15 uinutes.

3.2 The tuning arrn.neenont should be capable of reducins the clifferenc.e

between the frequency of n. received signal o.nc1 the actul'.l tuning

frequency too. value not exceeding io IIz.

4 .. Usable sensitivity

4.1 For cl.casea of er.rl.ssion l'.j.t.. and A3J, the sensitivity of· the

receiver should be eciual to or bettor th:.'1.!l 6 nicrovol ts ~or o.

si@'l.D.1-to-noise ratio of 20 dB.

4.2 For classes of coission il3 and ll.3II, the sensitivity of the receiver

should lJe eciunl to or better th.'\tl 30 oicrovolts for n sicnal-to

noise ratio of 20 aJ3.

Hoceiver output

The receiver should be suitable for use with a loudspeaker and n.n enrl)iece and should be capable of delivering power of at least 500 oilliwatts

to the Loudapeakez and o.t lea.st 1 nilliwatt to the car,i?iece.



PBARRETO

Pencil

A IX/Res. 334 - 8 -

6. Pemissible wa;gi.?41-up period

The equipnent should be M.pable of operation on 2182 kHz ·within 30 seconds

o.fter swi tchil'lcS" on.

7.

8.

Controls nnd indicators

7.1 All controls should be of such size cs to pemit nornal ncljustoents

to be e~sily perforoed and the nuober of controls should be the

Dini.nun necessa:ry'. for · satisfactory and sinple operation. 1'.ny

onlf'u:nc·tion of autooatic tmllllB' deviceo, if fi tted1 should not

prohibit rapid Draper opero.tion on 2182 kIIz.

7,2 All controls, in?truoents o.nd indicators should be clearly labelled.

7.3 The receiver shall be provided with a. r.m.nual control of audio

frequency gain.

Selectivity

The selectivity of the receiver should be such that the int·elligibili ty

of the wru:1ted sic;nal is not seriously affected by tmwanted signals.

9. Autonatic gain control

The receiver should be Drovided with autonatic gain control.

10. Power supply:~

10.1 The receiver should continue to operate in accordance with the

operatioru:u standards contained in this reconoendction in the

presence of variatio11s of the l)ower supply norno.lly to be expected

in o. ship.

10.2 Provision should be oade for protecting the receiver fron the effects

of eJccessive voltaees, transients and reversal of the powor supply.

* Operntional stnndnrds for sources of energy are under consideration.



- 9 - A IX:/Res. 334

10.3 If the equipoent includes parts which are required to be heated in

order· to operate correctly, for exan1:>le, crystal ovens, the power

supplies to the heating circuits· should be· ·!irranffed so that they can

remin opera ti vo when other supplies to or wi~.birl th:e equi.pnerrt are , switched off. If a speci.o.l switch .for .the heat.in'?, cir.9ui t.~ is

1Jrovidecl, its fm1ction should be clearly indicated. The correct

OJ.)cratinc; teoperature should be reache·d within a :period of 30' ninutes ··;···,·

a.fter the application of power.

11. ~_£,foty precautions

11.1 The equivnent should be so designed ru1d constructed that the receiver

is protected against d&1a.ge when a strone radio frequency signal is

applied to its i11put. Tho receiver shall operate nomally without

fuxther attention when tho si@1al is reooved.

11.2 Tho receiver should have ooc:ms of protection against c1noa.ge due to

static voltacres which nay al)pear at its input.

11.3 Beans should be provided for earthing the cc.so of the receiver but

this should not cause nny teroinal of the source of electrical

enerrsy to be oc:.rthed.

11.4 As far as practicable, accidental access to da.nserous voltases

within the e~uipnont should be prevented and an appropriate warning

notice be affixed.

12. ~ability and resistance to effects of climte

The receiver should continue to operate in accordance with the operational

atandar-ts contained in this recoonendn.tion under the conditions of sea state,

vibration, hunidi ty and change of tenpe:mturo likely to be expexLenced in a

ship.

13. Hiscellaneous

13.1 The receiver should be so desicned as to linit nutun.l .inforforenoe

with other electronic equipnent, particularly its associated

transnitters ond receivers, such that satisfactory operation

is ensured.



l .. De/Iles. 334 - 10 -

13.2 Equipnent should-be provid~d with an externru. indication of

oanufe..oture, type ond/ or nunben •.

13.3 Inforna.tion 'Should. be provided to enable co!l]?etent nenbers of

the ship's staff' to operate and naintain the equipnent efficiently.

13.4 The internal parts of the equi]?Oent sh~uld be easily accessible

for inspection and nainte11a.nce .purposes.





Documents

RESOLUTION A.334(IX) adopted on 12 November 1975 …9).pdf · 2020. 12. 21. · A DC/Res. 334 - 2 - 2. F:teguencies and classes of enission 2.1 The radiotelephone transnitter should