VEB FUNKWERK KOEPENICK: DEVELOPMENT OF A MOBILE OMNIDIRECTIONAL WIDE-BAND RECEIVING ANTENNA

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00810A006200410009-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 21, 2016
• Document Release Date: August 6, 2008
• Sequence Number: 9
• Publication Date: March 31, 1955
• Content Type: REPORT

Approved For Release 2008/08/06: CIA-RDP80-0081 OA006200410009-2
CENTRAL INTELLIGENCE AGENCY
INFORMATION REPORT
COUNTRY East Germany
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-
ation of which in any manner to an unauthorized
person is prohibited by law.
VEB Funkwerk Koepenick: Development
of a Mobile Omnidirectional Wide-
Band Receiving Antenna
DATE OF INFO.
PLACE ACQUIRED
DATE ACQUIRED
DATE DISTR.
NO. OF, PAGES
REQUIREMENT
REFERENCES
THE SOURCE EVALUATIONS IN THIS REPORT ARE DEFINITIVE.
THE APPRAISAL OF CONTENT IS TENTATIVE.
(FOR KEY SEE REVERSE)
REPORT
31 March 1955
25X1
25X1
25X1
fx
than 2 for the frequency range of 30 to 300 'mcs and for the simultaneous
reception of vertical and horizontal polarized waves. It was further-
more specified that this antenna should have an unsymmetrical 60-Ohm
connection with the receiver. The development was carried on in 1954,
but was not vet completed as of es.rly January 1955. It was carried on
under the supervision of the department head
directional wide-band receiving antenna with a reflection factor R less
2nd link: 50 Ohms and 0.6 micro-Henrys.
S-E-C-R-E-T
7. in late 1y7,, veparimenz rzti kiecnnicai. Peveivpmunu v. r_uuennna/ va vy
Funkwerk Koepenick received an order for the development of a mobile omni-
2. The following are the developmental steps performed)
a. Investigation of a vertical radiator consisting of an aluminum
tube 0.75 meters long with a diameter of 5 centimeters and
characteristic impedance (Welienwiderstand) of Z-100 Ohms (see
figure 1 of Annex 1).
1) Investigation of m. A maximum value of about m-3 was measured.
Through insertion of 2 RL links (resistance and inductivity),
the maximum value of m was reduced to 1.5 over the entire
range from 30 to 300 'mos. One link was inserted at a height
of 0.5 meters, the other one at 9.75 meters. The RL links had
Ohm values in the order of 100 Ohms. The lower link was con-
nected in parallel, the upper one in series. A number of
measurements were carried out for real R values from 50 to
200 Ohms and L values from 0.1 to 10 micro-Henryb:.. The fol-
lowing combinations were selected as the most favorable ones:
1st link: 100 Ohms and 0420 micro-Henrys.
25X1
1'
25X1
Approved For Release 2008/08/06: CIA-RDP80-0081 OA006200410009-2
 Approved For Release 2008/08/06: CIA-RDP80-0081 OA006200410009-2
2) Investigation of field density. Figure 2 of Annex 1 represents
radiation diagrams of a regular antenna and an antenna with RL
links. It mkg' found that through use of the RL links the rad-
iation chi=racteristice (Rundstrahlcharakeristik) could be pre-
served, Therefore all essential requirements were fulfilled
with the exception of the horizontal component.
b. Investigation of radiators placed obliquely. The dimensions of
the radiator and the RL links were the same as cited above. Thi,:
inclination angle of the radiator' was 300 to 450-
1) Impedance investigations were not carried out because it was
expected that the values indicated above would not change
essentially.
2) Field density: in addition to the vertical component, the
horizontal one was obtained through the inlination of the
radiator. It was found that the most favorable inclination
angle for the occurrence of bothtDmponente was 300. However,
it was also found that the radiation characteristics dis-
appeared. The horizontal component was-70% of the vertical
component.
c. T ications cited above stiow tue of the develo 7t~:]
Before
jIt-was planned to oontin&e the developmen w four
antennae connected together and inclined at angles of 300. This
model was only studied theoretically (see figure 3 of Annex 1).
25X1
25X1
Approved For Release 2008/08/06: CIA-RDP80-0081 OA006200410009-2
 Approved For Release 2008/08/06: CIA-RDP80-0081 OA006200410009-2
S-E-C-R-E-T
-3-
Annex 1
Regular antenpa
Fig. 3 Four radiators (Stabstrahler)
Fig. 1 Radiator with.RL links
S-E-C-R-E-T
Approved For Release 2008/08/06: CIA-RDP80-0081 OA006200410009-2