VEB FUNKWERK KOEPENICK: RESEARCH ON DIRECTIVE AND EFFECTIVE ANTENNA GAINS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00810A006200620008-0
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 22, 2016
• Document Release Date: August 16, 2010
• Sequence Number: 8
• Publication Date: April 4, 1955
• Content Type: REPORT

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of Eng., Rolf Gruse lknqsTh
a preparation for similar studios
aintthe s wellaasttmeter wave tioaas
studies included theoretical 50X1-HUM
Directive "AA
as Theoretical be s' the following expression can be used in'a oartesiaa'
coordinate system for the directive g
fffcLsod9dp
C
If the symmetry axis of the loop, in figure 1 of the annex is
selected as Z-axis it follows that
loft
fined by use of two methods:
Get rained
1) brbtibally ? according to Maxwell.
2) Eap;erimentaRlly.~ This was followed.by.nuaerioal,integ;ation.
b. Inoeet.igatione .a9f V-.k, and of Yt i antennae had the follow-
ing results:
1) Directive gain of V-antennae: about 'iU'deoibele.
cibels
d
.
e
-f Yagi antennae: about, 14
CENTRAL IrELLIGENCE AGENCY
INFORMATION REPORT
COUNTRY
SUBJECT
East Germany,
VES Funkwerk Koepeniek: Research on
Directive and Effective Antenna Gains
DATE OF INFO.
PLACE ACQUIRED
DATE ACQUIRED
1. April 1955
50X1-HUM
THE SOURCE EVALUATIONS IN THIS REPORT ARE DEFINITIVE,
THE APPRAISAL OF CONTENT IS TENTATIVE.
'50X1-HUM
50X1-HUM
(Teahni
1. During 1954s DepartmentATEA`.
This material containi information affecting the
National Defense of the United States within the
meaning of the Espionage Laws, Title 18, U.S.C.
Secs. 793 and 794, the transmission or revel-
ation of which in any manner to an unauthorized
person Is prohibited by law. 50X1-HUM
REPORT
DATE DISTR.
NO, OF PAGES;
REQUIREMENT NO.
REFERENCES
50X1-HUM
Sanitized Copy Approved for Release 2010/08/16: CIA-RDP80-0081 OA006200620008-0
Eng. Horst Uesonwznaoi
earchwae
+
t
d
in the UKW ranges- This res
'
oer ie'd ou
It
50X1 HUM'
pas
 Sanitized Copy Approved for Release 2010/08/16: CIA-RDP80-0081OA006200620008-0 50X1-HUM
These results were obtained through use of concentric line resonators.
(Topfkreise). In order to obtain more accurate measurement results
for the side loops of the diagram,. development of a special measure-
ment device for field intensity was started. The device was. to have
the following specifications: frequency range, 30 to 300 mcs;
sensitivity, about 100 micro-volt; unsymmetrical input with character-
,
1955
f Januar
A
,
y
s o
istio impcdanoe (wave resistance), Z-60 Ohm.
construction of the device had not yet begun.
Effective gain
In addition to the radiation characteristics this gain is dependent up-
on the Ohm losses (heed losses, Joule losses) and upon the mismatching.
a. Theoretical basis: the effective gain G equals alpha . D where alpha
represents the efficiency factor expressing the Ohm losses and the
mismatching. In case of matching, alpha becomes equal to K whereK
is the absorption factor. Thus G ? k D, It 0 an4 D are known the
':losses can be determined. Determination 8f D'14 aeecribed above*
b. Measurement of G:.the following two methods were planned:
1) The comparison method (see annexed figure 2). 'According to this
method G is'determi'ned by the following-formula'
G
where V1 is the voltage of the unknown antenna and V2 is the
voltage of the known antenna.
2) The absorption method (see anne*od figguure.Jj). 0 is obtained with
the aid of the approximation fP la by 8'riis?
where PE is the emission
r is the di
used if the
identical.
interrupted
continued
ower, PR it the receiving ppwi , nd
stance of the two antennae.
two Antennas 8A and EA (e
n Bt
n 1955..
S'=E-c R-E-T
Sanitized Copy Approved for Release 2010/08/16: CIA-RDP80-0081 OA006200620008-0
 Sanitized Copy Approved for Release 2010/08/16: CIA-RDP80-0081 OA006200620008-0
o1 S-E-C-R-E-T
-3-
Fig. 1, Radiation characteristics in
a Cartesian cgordinate system
Unknown antenna (Vi)
Known antenna (V2)
Fig. 2 Principle of the comparison method
1
Rgceivezj
Emitting antenna (SA)
,Receiving antenna (EA)
Fig. 3,Principle of the absolute method
Sanitized Copy Approved for Release 2010/08/16: CIA-RDP80-0081 OA006200620008-0