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Documents of the International Radio Conference (Atlantic City, 1947) To reduce download time, the ITU Library and Archives Service has divided the conference documents into sections. • This PDF includes Document No. 501-600 • The complete set of conference documents includes Document No. 1-1008 INTERNATIONAL ·Document No. 501 R-E -RADIO c·ONFERENCE ATLANTIC CITY, _1947 July·2, 1947 Report· to the Allocation of Frequencies Committee (Committee 5) · by the Chairman of. Subcommittee.C · (~ropical,Broadc~sting) 1. The Subcommittee met 12 times. In order not to impede the work of the ·other Subcommittee's of Com mittee 5, a report was issued on June 11 prelimina~y ·(Document 3~5 .R-E). The following is. the final re- port drawn up by the Chairman. of t.he E?ubcommi ttee .. · 2. The following terms of ref.erence ,. derived from·· those given by Cbmmittee. 5 to A, were· Subconunitt~ee taken as guidance the ·work, of Subcommittee C: fo~ To endeavor to r~ach agreement o~- the bandwidth allocations that should be made for/ the tro~ical broadcasting service, bearing in mind'that the joint demands for frequencies of all the services are such to preclude the · ~s possibility of meeting :fully.the of d~mands any one service, and on the understanding that this agreement reached at·this·Subcommittee shall not be binding when allocations for tropical broadcasting come. to be considered in· direct relation to the allocations for other services~ 3· The use of the·word-"Tropical" in conjunction with the.word "Broadcasting" proved r.ight from \the beginning to have .ca-used a great deal of confusion. This word had been introduced in an effort to ob~ tain allocations for broadca;ting in the range \. above 1500 kc/s where they had originally been omitted and allocations were made·only for the other services. In the late 1920's experiments on domestic broadcasting in zones where·high atmospheric noise levels prevail proved that higher fre~uencies than 1500 kc/s would give a more .. satisfactory ser vice than that by the use of below - fre~uencies 1500 kc/s. _ I~· is, therefore, imperative that_ fre quencies in the bands over 1500 kc/s .be made ·avail able for domestic purposes·. b:ro~dcasting 4. In an'effort to g~t ·a cle~r outline of the· issu.e t,he foilowing statement was agreed. upon as to the ty~e of service under consideration: 58r:rt - 3 Jui\. 1947 I r -2- , (501 R:.E) . -\ A type of broadcasting using frequencies, higher than the standard frequency broadcast band for internal, national use in the .tropical zone, .hereinafter defined, where it can be .shown that ·due to' difficulty of high atmospheric noi~e levels and pro~agation~ it'is not po~sible to furnish ecoqomically a more satisfactory service through the ·use of low, medium or very high frequencies. 5. The belt of high atmospheric noise level where. the use 'of the frequencies under.. .. consideration would be permitted was decided upon after ~ det~iled stu~y of the various factors involved. This.belt will be zone comprised at the v!i thin the parallels 30 d~grees North ~nd 30 degree~ South with the follow~ · ing extensions where large ·continental areas are. inv·olved: a. From 30 deg:rees East Eastwards to 80 de , gxaees East the Nor·thern limit should be · extended .to parallel 45 degrees North and b.( F~bm llO.degreees East Eastwards to 14' 0 degrees. East the limit should be South~rn extended to parallel 35 degrees South. ~- ·, In·order to approach the p~oblem ob a f4ctual ' basis the Subcommittee organized a Working Group · which firat collect~d all available. requirements for bT'oadcasting in .the belt of high atmospheric noise level around the world. It then proceeded· to analyse these figures on pt1rely technical con siderations. These considerations were: a. The~power of the transmitter, b. rhe service area of tne transmitter, c. The .. propagation·cha:rac.teristics of the fre quencies under cons.ideration, · ,_, . d. possibilities of geographical sharirtg,· ~he e. ~he possibilities df time sharing, and 1 ,f. The possibilities of band sharing. By applying thes~ consider~tions th~ Working I • • I Group arrived at target f~gures for minimum require m9nts,· much smaller than the total requirements. - · These fig~res, 1f granted on an·~xclusive basis,· would just·meet the requirements. of broadcasting in the belt of high atmospheric noise level. - i 5S08 .. · :-3- (501· R-E) .r ··· Since,. however, the joih.t demands for. . frequencies. ·of' all ·the serv·i'ces preclude the· 'possibil.i ty of · fully· meeting the ·rteqnirements of any one S.e-rvi-ce, the Workip.g Group subniltted a third set of figures,, still smaller than.the minimum·requirements, . . (vide Docume~t 369 F\-E, page 8). · .· .. 7• Af~er careful bonsi~eratio~ or the ·report of ·or · the w·orking Group and.; in parfi<eular, the third set of figures, Subcommittee C-recommerids that the foll~9;wfng banqs be allocated f9r ·broadcasting: ' . ~ ' ' ' ,·. a. Bet~een 1. 5' ··and· 2. 85 Mc/s~; . . 200 kc/s.on & shared basis on condition that the sharing be· done- in such a manner no.interference·would tha~ b~ ca~se~ to~ Br.oadcasting. _ b .!.American B~_s.ioE_:. Bet-ween. 2. 85 M.c/s and 4 Me/~: · - · 200 kc/s on a shared. basis ·on. condition ~that the sharing he .done in S'UCh a manner . that no interference wou·ld be ca_used 'to· .., ·or Broadcasting (it) Other parts the world: 300 Rc/s UNQtJALIFfED. . ·. ·· .~· . c. i ._Ame1~tcan. ~£8.· · io_g_~Between 4 and 6 Mc/s: · . 260 · kc/s on a shared basis on condition that the sharing b~ done in such a manner no that interterence with ·broadcasting. might result and. (ii) ·.9.th..~r~t::J_ _ Qf__th.? world: . 300 kc/s UN UALIFIED·. . d. Between 6 and 8 Me ·-.s : · _. 250 kc/s on a world wide~ basis. (UNQUALIFIED) .. e. ·. Setween. 8 and 10· Mc/s: ·, 250- kc/s· ·on a world wide basis.-. • (BNQUALIFIED)and ·f. Over 10 Mc/s :, . · .. . ; , 150 kc/s· on :a world wide basis . . ( U_f:JQUALIF I_ED) • . I . . . , With regard tb the recommendations for specif+c alloc~tions of ·rrequencies :ln the. bands ove·r 6 Mc/s Subcommittee C recommends ;tpat: . · . . . ·Any f.orm -of broadcasting should be dealt wit~ ~quitably and should .receive a fair p.ortion in the exclusive bands reserved for broadcas.ting·, · after ha-vip.g. taken into a·ccount the figures p1~1esented by this Su.bcommi ttee. -· · 'This frequency distr~butiono~hould be made by the,High Prequency Broadcasting Conf~rence on a technical basis, taking into account ~the· 'figures proposed· above. 5809 .. . ,. .. . -4·~ (501 R~E). • . . 8. ·. ·rn· .. c,onclusion the· Chalrman or·· Su'Q-conun'i tt~ee C wis'hes: to expr~ess .his appreciatlon of· the. spirit of co.-operation and the \villiBgrtes·s to· compromise shown:· by tne many Delege.tions tak:Lng ,part in ~he . diff'icult··wo-rk'~or this Subcorn1nittee ... He. also J . w.ishes to record his great ·:appreciation for the excellent ·analysis rep'or,ted by the W6raking G:rJoup, I this being the first time that ~ rational app~oach \vas· made ;Ln an· a-fbempt.- ~o. solve the .prob.lem .of ·sh~ring frequencies on a world wide.~asi~ within a· particular se"rvice. 'He .would also 1ike ·:,to thank the Repbrt~rs fo~ their efficient.wo~k and lhe· . . · Interpreters. for .their untiring efforts. ·, ._ I . . . •. . . . . ~: ' .. · .... of . ' I\. • The Cha.ir·ritan Subconrrni t te 5C H. van Veen. de~ . I . . I_NTERNATIONAL EADIO CONF'ERENCE Document No. 502 R.-E ATLANTIC CITY #' 19)+'7 \ July 3, 1947 ; ( 6) .·:~~~~·ft Ana1ysis of Allocation.... ....P.. ,.r.. ..o.....p.. osals. ---;_bov,€··~··:r2~J~~z-~~~----~ -~- ·.-c In tJ:'oduc tion , A pre-liminary examination has been.· made .of the various proposals' placed before the Conferenc~ for the· band· 30 Mc/s upwards. . I , 2. . In that portion of· the s.pec tru111. between 30 .. ancl· 10.500 Mc/s .proposals· were submitted by Australia,· Cana.da., Chin~, France,.India (up·to 108 Mc/s)~ United Kingd6m, ~ U. S. A. and· U. S. S. R. The se a·re summarized in Appendix . I up to 1,0,500 ~~/ s. 3. . It would appear from a s tud:y.: of the _pr·oposals- that althougti th~re is corisidarable diyergence in individual proposals, as illustrated Appendix I, Should not be ~n i~ dif'i'icul t to arrive at ag:eeement on certain port1ons of· - the band on .either a ".vorl(l-wide ,or regional basis. .. ' 4. .It is .suggest~d that, as a general principle; allo catiGns above 30 Mc/s ne.ed not,· of ·n~cessity, b~ ·fully world-wide.· · (i) However; some allocations essentially require world-wide agreement,·e.g.J certain aero- · ~auticai .n~vigational aid~. (ii1- There are also some othe:r~ allocations on whicll wprld-wide agreement may be even desi~able, 'though not e.g., oroadcasting. essentia~, ( iii) There are some services where O\ving to the J similarity of plans put forwar·d~ world-.,wide agreement may be apparent. from a study of the ·proposals; although neither essential it~is nor necessarily desirable. ~1es6 and the re m~ining allocations could be agreeyd either r.egi-ol}ally or· nationally. · . ) 5. The draft· analysis g:Lven ,:i.n Appendix II has. been made as a re:sul t .of a -study .of the proposals following the p:r· inc ipl e s 9u tl ined in paragraph 4 . . ·. . :, · 6. Above 10,508 Mc/s, ·a m.ore limited number of countries, s-ubmj_tted proposals up to approx_ima·tely 3o,'ooo Mc/s and one proposal up to 75,000 Mc/s. 'T,.,o distinctly different ·methods of approach ~ere used in,presenting the prop6sals, one following the existing'service basis, ahd the other . a. functional basls. · - 4· Juil. 194{ · 5843- -CI). '- (502 R-E) · 7. The Conuni ttee will· therefore need to consider whet~er or not it is prema~ure to decide on alloca- tions. above l~; 500 Mc/s.. . · H~ It,i-s obse~ved that certain plans ~nclude a the use of pulse emission, although ~ote-~once~nin~ the ·philosophy" on which the note is ba·sed wotlld ap"7 pear to This matter may come under dis differ~ cus si on at the Commit tee. ·In view of the pr·e sent state of the art it might be· easier to agree tho~e bands from which ~~lse emission should be excluded . . For this reason no ·pulse sign has been shown in the ·Appendices. I. FX F].xed ~ Mob General Mobile MM Marit1me·Mob.i.le A eM Aeronautical Mobile ,. LM' Land Mobile . .B Broadcastlng 'B( T/V) Televisj_on I B(;i?M) . F.M.Broadcasting Am Amateurs Met Meteorological service NA Navigational aids MNA ~ Maritime navigational aids AeNA Aeronatitirial na~igational aids . ISM · Industrial, Scientific, and Medical Services. · · · ( / APPENDIX I. DRAFT ANALYSIS-OF ALLOCATION PROPOSALS I Additional al1~ocations I or dfffering alloc~tions where· proposals are not·· ~ in. general agreement _30.0··32.2 Fx, LM M.:.l\1, --AeNA, ·M NA • J 32.2 -·40. 0 Fx, Mob, AeNA .... 40.0-43.5 . Fx, Mob, B(T/V), AeNA, · ISM. . . 43.5-50.0- Fx, Mob, B(T/V). 50.0-54.0 B(T/V) Am . s4.o-6o.o Fx, Mob, B(T/V). 60. 0-~63 .6 . . Fx, Mob, B(T/Vl, AeNA · 63.6 ·-68 .o F~,-Mob,. B'(T/V . .68. 0-7-0.0 . Fx, Mob, B (T/v , AeNA, \ 'MNA. , 70.0-72.8' Fx, Mob,, .B(T/v); Am. 72.8--74.8 Fx, Mob, B(FM), B('r/V), AeNA. 74.8-75·2 75.2-77.} Fx, Mob, B(FM), B(T/V) · \ 77.3-80. o. l ,· Fx·, Mob, AeNA 80.0-82.0 F x, Mob , B (FM B ( T /V ) 82.0-85.0 Fx, Mob, B(FM , B(Tjv),, AeNA . 85.0-87.0 Fx,, Mob, B (FM)/ B (T/V) '8'7. 0-88. 0 ' Fx,- Mob, M~A, B (FM), , . / .B(TV). · 88.0-90 Fx, Mob, 'MNA,. ,Met, B(PM.), 1 l , 90. -90.5 ~ ~ /V) MNA , B B ( T 90.5-93.5. B(FM) B(T/V) . 93·5-94.5 Fx, LM, MM, B (FM),· ' B(T/Vl 94.5-95.'0 Met, B(FM , B(T/V) 95.0-100 ' F~, Mob, B(F.M), B(T/V) :; lOO 108 AeM, MM, MNA, B(FM) 108 118 AeNA MNA . . 118- 132 Ae M r . MNA.· 132 144 F~, Mob, AeNA 144 11~8 -AeMj MM, Am• 148 156 .·Fx, Mob. 156 160 Fx, Mob, Met, B(T/V). 160 166 Fx, Mob, B(T/V) 166 170 F_x, 'Mo1(, Am. * .N_QT.E Wnen all the proposals are ide.ntical, t.he ,.. allocation ls. unde1,~.:in.;.~9:_ .. I 5845 I -4- (502 R-E),; 170 - 174 ·,_ll• ·px _, Mob, AeNA~ B(T/V) 174 - 178 Mob, AeNA, B(T;J), F~x, AeNA 178 - 200 . I Fx, Mob, B(T/V) . 200 214 Fx, Mob, B(T~l), AeNA, MNA , 214 220 Fx, Mob, AeNA ;' MNA '220 225' AeNA, MNA.; Am. 225 - 2L~l!- I . ---...... 'Fx, Mob, AeNA, MNA 241+ - 250 I Fx, Mob, AeNA, MNA, Am 25 0 2b0 Fx, Mob, AeNA, MNA 260 328.6 I . 32f:L6-335 ,4· 335.4-385 385 - 400 Fx, Mob, Am 4oo 4o6 Fx, Mob, Am, Met. 406 - 4.12 Fx, Mob, fun. 412 420 " Fx, Mub, Met, AeNA,. MNA 420 - ·450 AeNA· Am, IviNA. 450 - 460 .Ael\TA Fx, Mob, Am_. 460 - 4'{0 Fx, I.M, MM·, Ae M 470 -· 550 550 585 B (TV), Fx, Mob; AeNA 58S 610 . FXj Mob, NA ,. ' 610 890 I 890 - 940 Fx, ISM . 940 -- 960 B q6o - 1060 AeM: io6o-. 1215 NA, Fx, Mob, Am. 1215- 1295 - F x , Ivro b , Am • . 1295- 1600 Fx, Mob. 1295-1400: Mob (except AeM) 1600-. 1700 __ Ae1L8.~ 1700- 1750 Met 1750- 2300' F~x·;····Mob · 1750-2200: Mob (excepi - ' I Am AeM) ,2300- -2~·00 AeM, AeNA ,, 24oo~ 2500 -- '· Fx, Mob, Mob· (except AeM), AeNA, ISM. 2700, 2~00·-· Fx, Mob, Mob (except "AeM), Am 2700- 2750 Fx, Mob, Met. AeNA~ 2750- 2900 AeNA, MNA ~ Met. . 2900- 3300 NA Met (within band 30~0- 3200) 3300- 3500 I Fx, Mob~ NA, Am 3500- 3900 I Fx, Mob, NA 3900-· 4200 I ~-200~ l+~·OO Fx, ·Mob. I ( 5846