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

• Document Type: CREST
• Collection: General CIA Records
• 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
• Publication Date: April 28, 1954
• Content Type: MEMO

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