AN ANALYSIS OF THE DATA PERTAINING TO THE RUSSIAN SABERU AGENT RADIO SET

Document Type: 
Collection: 
Document Number (FOIA) /ESDN (CREST): 
CIA-RDP78-03424A002100090003-8
Release Decision: 
RIPPUB
Original Classification: 
S
Document Page Count: 
2
Document Creation Date: 
December 27, 2016
Document Release Date: 
September 12, 2012
Sequence Number: 
3
Case Number: 
Publication Date: 
April 28, 1954
Content Type: 
MEMO
File: 
AttachmentSize
PDF icon CIA-RDP78-03424A002100090003-8.pdf150.24 KB
Body: 
Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424AO02100090003-8 Chief, Reatarch and Dev'elaiment Branch Chiefs arch sand Devolopmeat Laboratory An Analysis of the Data Pertaiain1 to the ausasian &UM Agent Radio Bert 1 'i!' R t (a) "Supplement to Field Report on the 300 ("M 53-0503 dated 19 November 1953 (b) The fallowing is a wore description of the Russiam AM eft radio set. The material for this description as obtained from retwomwe (a) and a prior evaluation an an old+e ocd.al of the sears equip=es t, reference (b). No spent differences were noted between these two eva1.uaticns. ? i ver>-ers The set mrdca s use at three pentode tubes when in the "receive' position. The ant4mmmuL Is c taitlvsiy coupled to a brad bwd r.f. applifie. The output of this first stags is fed into a petada regenerative detector. After detection the atadtu signal is amplified by the third stage, bra the signal to a suffi- ciont, level to power a fwd set. AU of these circuits are aoo ves tiomal east tb* detector. The control Of rOGGOOratica, when using a pentads tube, is um=l4 aecasllished by varying the screen grid voltage. In this detector a variable p2*te by- pass capacitor is used to control regwerati,on. This aetbcd of control is genssvlly used with a trio" tube. 2. Witter ( t.ristics When traaami.tting, the broad bend r.l. aaplitier serves as a Rartl.y or regenerative crystal oscillator and the audio out- put stage functions as an r.f. power amplifier. The filaawt supply to the motive detector is removed. The antAMM t= irk is link-coupled to the fib amplifier talc coil and consists of a varicamter in series with the antenna terainal. The variameter is used to elec rically . resonate the enteafta at the operating frequency 000 REV GATE ysea B, ~~' 01110 COMP Orel TYPE 81110 CLASS ..3 _ PAGES REV CLASS _~~t US? 2 -L- KEXT KEY Jt y *UTkt Us 10?1 April 1954 Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424AO02100090003-8 Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424A002100090003-8 0 CONFIDENTIA' From a stuel y of one of the data boat it inn noted that one of two cc ant.rpoise terwinsla is used. One termins- tiau canowts, a 25 wit a lto r in aeriss with the a taer- poise and the otl connects directly to the cold a of the link. Above alepr ziaeestely 3&)0 karts the 25 wit r *citor is plaosd In series with the counteerpoise, ani below this fre- quWay is directly connected to the link. The reason for this aerraeagenawt is probably dine to the fact that above 3&')0 kcs the antenna exhibits +e c acity than the vaericsetter can reso ate. This 25 cut' sitar in series seduces the total capacity of the sntenns to a value within the effective range of they var'lca staar. Below 3800 lase the effective capacity of the antenna Is probably within the range at the variamster. The above resami g will bold true Provided the length at the antenna and counterpoise is that specified in the data book. 3? One possible eepplaaatio n for using as a eaten ao- of the type proposed for use with this sat is probably due to a desire, for trltaaaitting a wave at a low angle of radiation for liong range c .icatiaoaa. A perfectly vertical autsva^ radist*s most of the aitted m* W at an angle of zero agrees. An antenna of the type proposed Ylll probably radiatae most of tl? e e rgy at eons a4gle from sere degraees. Whom poor ground eva&Wtivity exists a large percentage at energy nay be radiated In the direction of the a 0unterpoise. Wban U61011 an aenterms with a co u'ttaerpoiso the conductivity at the earth has leas effect an the antemn impedes". Boa"" of this the performance of an aantaawa aead coanteer ise eystos ante probably be predicted, to a batter deegreaa of accuracy than with an ant eata not usi g a Q 1terpoi se. As a result the antes loading system could be designed within closer limits as the netr~ > not bw" to va all rues of i edace. R&D/JCT/ljm cc: OC-8 OC-O&Z (2) RMD Lab a;' Cbrono Dev/s Declassified in Part - Sanitized Copy Approved for Release 2012/09/12 : CIA-RDP78-03424A002100090003-8