Radio frequency requirements. The information contained in the frequency tabulation will be consolidated in the Test Director's preliminary frequency chart for Upshot/Knothole.

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AGC, Adjutant General Test Ui rector, LA5L KEFERLNCE: FCD..'LT 311.23, 19 November 1952, Subject "Radio Frequency Reqdlrer.erts"" We have given your letter of l y November 1952 careful stidj-. The i n - fonration contained in the frequency tabulation w i l l be cjriEoiidated in the Test Director ' s preliniinary frcmency chiSr.*, for Uoshot/Knothole; copy of t h i s chart will be furnished to D.iST. Some of t h e "uostions which will renuire further discussion «ltti repre8i-".aJ.B from the HF Trans ritter Site at I^FG. This organisation also operated a sizeable HF transmitting layout a t Indian Springs, Durir.r, Tunbler/iJnapper, timing signals were transmitted over a Lelephone these signals were then transroitted from AFuAT-1's radio fac ill tie a a t Indian Springs, usinc 3.440, 5.065, 8.055, and 13.095 (^C. 'IV.e (possibly t h e same four used on Tunbler/Snapper) to be Essigncd to Program 7 , and used for timing sig i als and voice trancT.i •.»'v. to be would free a telephone l i n e from '• "- to Indian Springs for oUh^jr use. cuencies sirnultaneouoly, and has a inaxiraur. of twenty (20) channels. At the Tiresent time, four, and possibly five, of the existing trans mitter s are comiitted for simultajioouL operation, twelve (1?) fregraphic Coixiunicatio is , 6nd nerotlations are in process for c^Lal-^ir' siraiJ.taneouE trans r is sion on frore than one fre-ucncy, i t does r»t ur.--;:jthat the NPG HF radio eouitsnent can meet Progrnn 7 ' sfull nt:-eJs. Trir i s unfortunate, since other agencies eij^e interested in usxrip the t-l-eThis material contains information affectphone tie - line if it were released. bited by law.

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2 , Re'-:uest for Iir rre:-uency by ir oj ect5.1. You have pointed jut that the es tabi ish - nent of a fifth VHF netat NPG will eliminate this reu u irene nt. We agree with t ' i s and your previous reasons for establishment of a fifth VHF net. The Test Director ' s Office will ask AEC to establish tn is net. 3 . Hequests for Use of the 162-172 MC Band by Projects 6.9 and 4.1. Tfdfi question has been the subject of a considerable amount of dis - and 171.525 MC forte lane te ring purposes.Project 2B.1 personnel have discussed then a tter with Commander Terry of i ' ro j ect 6.9> and believe that their conflicting interests can be handled satis fac - tori ly.Project4.1 needs t o use the band for less than 30 minutes, and can probably do so ;vithout serious interruption. However, this office needs t o knarf whether 4.1 * s transmitters can be shut off a t H j ^ 20 Minutes or must keep operating until batteries run down. 4 , Itadar Frequencies. As stated in your letter,all of the radar frequencies shown must be discussed with the various agencies in - A new agrcerrent on Air-Ground VHF-AM frequencies has been reached by held 20 November 1952 a t Albuquerr^ue. Agreement is as follows : 149.4 tia ry frequencies in the order riven for comnunijcations « ith S..C air - craft at NPG. 142.74 HC isa Navy Tower frecuency and will not be used, except in cases where no other channel is available. Since li»V.4, 140.22, and 143.10 MC are presently installed in the radio ii cill c ics at NPG, and have been used satisfactorily on previous operations,the Test Direc - tor ' s Office concurs in this agreement. Ttie multi p licit. of VHF-AH fr ecu enc ies shown as requirements for 1rejects 1.3,4.1, and 5.1, should not ci if i ict v;ith the requirement that all planes in the area must be able to communicate with the CP P.adio Control IVOOEU. The rana in ing frequency requirements shown appear t o cause no nroblems orc ; j nfl ict s, and will be included with Lhe Test Director ' s frenuency hibited by law. L