DEVELOPMENT AND CONSTRUCTION OF A 3KW AND 10 KW TELEVISION TRANSMITTER AT VEB WERK FUER FERNMELDEWESEN WF
Document Type:
Collection:
Document Number (FOIA) /ESDN (CREST):
CIA-RDP80-00810A007400780005-3
Release Decision:
RIPPUB
Original Classification:
S
Document Page Count:
8
Document Creation Date:
December 21, 2016
Document Release Date:
June 3, 2008
Sequence Number:
5
Case Number:
Publication Date:
July 26, 1955
Content Type:
REPORT
File:
Attachment | Size |
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Body:
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4 ?
FORMATION IN'1'ELLIG~NCE A~'' CY
FTRORMATION . REPORT
SECRET
East Germany
Development and Construction of a 3kV
and 10 kW Television Transmitte at
YEB Work fuer.Fsrnlneldevessn~
DATE OF INFO.
PLACE ACQUIRED
DATE ACQUIRED
This material contains information affecting the
National Defense of the United States within the
meaning of She Espionage Laws, Title 18, U.S.C.
Secs. 793 and 794, the transmission or revel.
ation of which in any manner to an unauthorized
REPORT
DATE DISTR.
NO. OF PAGES
REQUIREMEN'
REFERENCES
This is UNEVALUATED
Information
THE SOURCE EVALUATIONS IN THIS REPORT ARE DEFINITIVE.
.THE APPRAISAL OF CONTENT IS TENTATIVE,
(FOR KEY SEE REVERSE)
1. The following are the pertinent data on a 3 kW and 10 kW television
transmitter developed at TIM 11erk fuer Fernaeldewesen , Berlin- 25X1
Obersohoensweids. Development was started in 1949 and is to be coa.
plated in 1955. This television transmitter normally operates with
10 kW power; if, however, the final stage fails to function, the trams-
mitt?,,C?can still be operated at 3 kW from the modulation stage. The
tz tter can be set to operate on any frequency between 175 and 216
BJPM setting the transmitter for a frequency of 200 lls or over, it
is necessary to change the coils of the control transmitter (Steuersender).
Control-of the transmitter is effected by an oscillator quarts or by
self-ezoitation (Eigenerregung). The oonoentrio line resonators (Topf-
kreise) used in the transmitter are so arranged that they extend over the
entire range from 175 to 216 MBs. btoept for the final stage, these reson-
dars are so constructed that they can be calculated as i-wavelength
coaxial circuits (1 Wellenlaenge Eoaohsialkrsise). The oonoentrio line
resonator of the final stags? however, is set up as a double shortened 4-
wave]ength coaxial oirouito Except for the final stage, in-ooupa,ing of
the individual stages is capacitive and out-coupling is induotiv6, Thi
final stage has two Lecher wires and is coupled out capacitively at the
second one. Frequency multiplication takes place in each individual
stage. Tcllla1 frequency multiplication for the transmitter amounts to
24 times.
2. The transmitter is built into a series of cabinets, each of which is two
meters high, 75 oyytimeters wide and 72 centimeters deep. The indivitual
constructional components are arranged in the cabinets as follows,
Cabinet 1 - Control transmitter, control transmitter pre-stage and
control transmitter final stage
Cabinet 2 - First exciter stage (Treiberstufe)
Cabinet 3 - Second exciter stage
Cabinet 4 - Modulator I
Cabinet 5 Modulator 11 5EC'
Cabinet 6 - Modulation stage,'..,
26 July 1955
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Cabinet 7 ? Power supply and charge equalisation (Lastausgleich)
Cabinet B - Residual ridO-band filter (Iestseitenbandfilter)
Cabinet 9 - Final stage 10 kW
Cabinet 10 - Power supply and charge equalisation
Cabinet 11 ? Power supply
Cabinet 12 - Power supply
Cabinet 13 Power supply
Cabinet 14 Power supply
Control desk
Cabinet 15, - Pound transmitter
Cabinet 16 - Bound transmitter
Cabinet 17 - Bound transmitter
3. tubes in the individual stages are changed as followst
as Control
fransmitter ;'4aai Otago - tube is located down in the con-
centric line resonatoor audio removed and replaced by pushing up the
outer conductor (Aussenleiter).
to first and Second Exalter Stages - tubes can be reached from the top
of the cabinet and are removed by loosening a castle nut.
o. Modulation Stage ? tube is down in the Sonoentrio line resonator and
is removed by tilting the split head of the concentric line resonator,
d. Final Stage - tube can be reached from the top of the cabinet and is
removed by loosening a castle nut.
4. The tubes and gsoillating circuit are switched in a grid basis circuit
arrangement (Gitterbasissa2ya1tung5. The tubes are air?oooled. The band
width of the transmitter iA front of the residual side frequency filter is
12 Us1 in bSok of it the band width is 6 Mkse
5. Measuring of the alternating input current (=ingangswechseispannung)
in front of each stage is carried out as followst
as In front of the first exciter stage ? directly by means of crystal
rectification
be In front of the second exciter stage - directly by means of diode
rectification
co, In front of the modulation stage ? by means of diode rectification
through a capacitative voltage divider
It is impossible to sake any measurements immediately in front of the
final stage. Type ED 704 crystal rectifier and Type SA 101 diodes are used.
6. Stage control with a reflectoseter is effected as follows:
7?
a. in back of the modulation stage
be in front of the residual side?frequenoy filter
o. In back of the residual side-frequency filter
d. in back of the final stage-
The antenna protection switch (Antennensohutssohaltung) is in back of
the final stage and is a quadruple measuring device (oierfaohnesskopf)
composed oft a reflectoseterl a bigk?frequency input voltage measurement
device; a high-frequency demodulator for modulation control, and a high-
frequency deooupling device (Auskoppelung) for the control desk. The
quadruple measuring device is a pleas of coaxial conductor into which the
four component measuring devices are built. It can be plugged in and can
serve to connect the antenna either to the final stage or to the modulation
stage so thatp if the final stage of the transmitter fails to function,
the transmitter can still be operated from the modulation stage with kW
power. There are two charge-compensating stages (Lastausgleichstufen).
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Each charge compensating stage has the same type of tube as the stage to
which it is parallelfl so that if an impulse results in a high anode currents
the current of the chargedcoapensating tube is closed or reversed* Thus9
the sun of the anode currents of the power tube and the charge compensating
tube remains constant and the same amount of current is always flowing
though the anode mains set (Anodennetzgeraet)o Therefore, a drop in
voltage as a result of impulses cannot occur,
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Pin' Step
MONILuan
Blook M of W -Md ]I1 tsU-iaian t-tt r
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Clue-fourth of ire length
Shortezth
Shortening
Three-fourths of wave length
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I
aOwtwa am Noru "Rod
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OT/3O0 /
to 1/3 00
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iJ}%? 7V to 4,A
CIOULIUMAM-Of 3 - .Ad 1t W telg O?+ unw-ttw
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PRO
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Contro. Tritter 4 Final Stage
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