VEB FUNKWERK KOEPENICK: THEORETICAL ANTENNA RESEARCH

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00810A006200540003-4
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 5
• Document Creation Date: December 21, 2016
• Document Release Date: July 18, 2008
• Sequence Number: 3
• Publication Date: March 24, 1955
• Content Type: REPORT

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INFORMATION REPORT
East Germany
SUBJECT VBB Funkwerk Koepenicks
Theoretical Antenna Research
DATE OF INFO.
PLACE ACQUIRED
DATE ACQUIRED
Koepenick to carry out certain research concerning a number o m u
wave transmitters located in East Germany. This research involved num-
erical results which had to be obtained by measurements of these trans-
mitters. The research, which lasted until January 1955. was carried out
This material contains 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-
atlon of which In any manner to an unauthorized
person Is prohibited by law.
DATE DISTR.
NO. OF PAGES
REQUIREMENT
REFERENCES
REPORT
THE SOURCE EVALUATIONS IN THIS REPORT ARE DEFINITIVE.
THE APPRAISAL OF CONTENT IS TENTATIVE.
(FOR KEY SEE REVERSE)
1. In 1953, the East German Ministry for Post and Telecommunications ordered
Department. TEA (Technical Development of Antennae) of VEB Funkwerk 25X1
f AAA
Sct,~,att1o.ffel head of the department and
then by his successor Eng. Horst Geschwinde. The research was first car-
ried out with medium wave transmitters and later also with short wave
transmitters.
2. Antennae of medium wave transmitters
a. The following transmitters were investigated:
Berlin, about 400 kw with reflector
Burg, about 400 kw with reflector (under construction)
Ludwigslust, about 150 kw with reflector (under cond;ruc,*ion)
Leipzig, about 100 kw.
Dresden, about 100 kw.
Eash of the transmitters -aentioned has a main antenna and an auxil-
iary antenna of the Dreiecksflaechenantenne type. The main antenna
is a steel tube radiator, a quarter of lambda to a half lambda in
size, with FusspunkteinSPeisungo Some of the antennae are provided
with reflectors (figure 1 -of annex 1 represents a schematic diagram
of the main antenna and figure 2 of annex 2 represents a Dreeiiecks-
flaechenantenne).
STATE I Jl_I ARMY V
NAVY AIR 1_X FBI AEC ORR E OSI
24 March 1955
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b. Measurements were carried out in order to determine the values of
the capacity and the inductivity which the tuning circuits must have
for a good match of transmitter and antenna. In addition, the
measurement values were to furnish the numerical basis for a compar-
ison of the theoretical and actual values of the Fusspunkt resistance
(input impedance).
c. The measurements were carried out during night-time only, since the
other East German transmitters were not operating then. Nevertheless
rather large e?ctraneous voltages (Stoerspannungen) up to 5 volt were
measured; these came from atmospheric disturbances and probably from
West German transmitters. A powerful impedance measurement unit
therfore had to bi usede
d. The computing was carried out according to the so-called "extended
transmission line theory" (Erweiterte Leitungetheorie)0 1.46 on the
basis of line equations1. The radiation resistance'docurring in the
at'Genuatj.on term of the equation was computed with the iid of Maxwell's
field , theory2. --
eo The .computations Y14+:ec#: la s: f ,:th$};^;act tq a ti i"( ""',..::;5
A4$mpts to eliminate the discrepancies mainly irivahr-~ecT the followi*g
step,:
1) The computations were Enact made under the supposition of the
earth having perfect conductivity (unendlich gutleitende Erds).
Adjustments were made for an earth with imperfect conductivity.
Further corrections were made under consideration of the
Daohkapezitaet. (See figure 1 of annex 1).
";ith the aid of the corrections mentioned the practical experi-
ments still did not agree with the theoretical results. Therefore
the approximation method based on the extended transmission line
theory was disogrded and the strict integralle uatio th d
3.
Hallen was used q , n me o of
3) Although the complicated numerical evaluation based on the Hallen
method wws carried out repeatedly.,no results better than ttt)ose
obtained through the approximation method warp obtained. For
this reason the approximation method was finally used again and
the discrepancies were roughly eliminated by qualitative eval-
uation of the errore(oapaoities and induativities of the antenna
switch).
4) The deviations from the experiment were even greatr}r with reaps
to the auxiliary antennae. A good agreement with the results
obtained through use of the approximation Tethpd could only be
reached though consideration of the radiation 9oupling (Strahlungs-
kopplung) between the wires.
Similar research wee carried out concerning the antennae of short wave
transmitters. The investigations served the ?urpose of studying the
qualities of the Fuespunkt resistance of short wave antennae. The fol-
lowing antennae were investigated:
a. The antenna of the KN3 transmitter (3 frequency ranges from 3 to 18
? s-'; 5 kw - see,.figure 3 in annex 2).
b. The Reusen antenna (see figure 4 of annex 2). ti laboratory model of
this antenna was developed on the basis of a.proposltior m&de by de-
partment head Dr. Erich Schaettloeffel. In view of its wide shape, its main
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purpose was to make unnecessary the tuning circuits for the matching
of transmitter and antenna.
co Various wire antennae. Xhese antennae were only used for laboratory
work by other departments, for instance Department TEF. Y/
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Comment. Line equations are relations obtained from the well-
known telegraphic equation under consideration of
the attenuation.
fit. The following lierature was mainly used: Brueokmann,
Theorie der We llenausbreitung; Zuart, Elektromagnet-
ische Strahlun~refelder,
ommennto This method makes it possible toc.oompute with a
h
igh degree or accuracy the current distribution
upon the antenna, The current distribution is the
unknown value in the integral equation,
of 'InI11F:*,' o
.;p'a;;? ?cn ,,~ ~ ~~'FA A '',~r 'k?? , .~.a ? ?~ i"9,;5 an
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Annex 1
Dachkapazitaet
Guy lines
Power supply
line
Antenna
/~ house