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: 
AttachmentSize
PDF icon CIA-RDP80-00810A007400780005-3.pdf307.59 KB
Body: 
Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 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 25X1 25X1 25X1 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 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). 25X1 { Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 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, Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Pin' Step MONILuan Blook M of W -Md ]I1 tsU-iaian t-tt r Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Clue-fourth of ire length Shortezth Shortening Three-fourths of wave length Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 I aOwtwa am Noru "Rod Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 OT/3O0 / to 1/3 00 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 iJ}%? 7V to 4,A CIOULIUMAM-Of 3 - .Ad 1t W telg O?+ unw-ttw Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 PRO t ooV zoo )"Ar T Contro. Tritter 4 Final Stage Approved For Release 2008/06/03: CIA-RDP80-0081 OA007400780005-3 1H 5o0 BV ''?m14