Coaxial Cable & Associated

Telephone & Television Systems

FIAT 286


Office of Military Government for Germany (U.S.)

Office of the Director of Intelligence

3 October 1945



John A Parrott

Technical Industrial Intelligence Committee



Targets visited and Personnel interrogated:

Hamburg:    Television studio, Reichspost, Jungfernstr. (Jungfernstieg?, AOB) Local Central Offices. Interviewed Huber and Scheider and others of Reichspost.

Lohbrugge:    No. 3 Hamburg Toll Office. Interviewed Lt. Van Dyke of British Signals and Reichspost aatendants at Office

Lüneburg:    Repeater Station

Harsten:    Underground unattendet television amplifier station

Usingen:    Underground repeater station

Fürstenhagen:    Interviewed Dr. Dull and dr. Adolph Heilman (Heilmann?, AOB) of Reichspost

Nürnberg:    Interviewed Enzerberger of Reichspost and others

Munich:    Underground Repeater Station. Interviewed Dr. Fuerer and herr Mohr of Reichspost

Condition of targets: Coaxial terminals and repeaters undamaged Very few records of technical documents

Technical information on the important features of the 200 channel telephone carrier system was secured plus rather general information on the television system. This had not been used since 1939, few documents were available and it was claimed the only well informed people on the matter were in Berlin.


Berlin-Hamburg:    200 speech channels

Berlin-Frankfurt: 200 speech channels, tapped at Giessen for military purposes.  Brocken Leg from Braunlage repeater station

Berlin_Munich:    200 speech channels (Some stated 100 channels used) Leg from Trebnitz repeater station to Leipzig    Leg from Neustadt repeater station to Nürnberg

Munch-Vienna:    200 speech channels

The following sections were under construction:

Berlin-Hannover:    Cable in but not all repeaters

Hannover-Dortmund:    Cable under construction

Frankfurt-Cologne:    Cable in but not repeaters

The first system installed was between Berlin and Munich on which 30 special circuits were derived and a 180 line, 25 frame television system (Was this the Reichspost video link, meant for individuals speaking and viewing to one another?, AOB)    Difficulties due to interference between the television channel and the speech channels as well as a shortage of speech channels in 1940-1941 resulted in modification of the amplifierss during the war conform the new standard system for 200 speech channels and discontinuance of television. This system had 35 km repeater spacings for both speech and television whereas the berlin-Hamburg section had additional television amplifiers at the 17.5 km intermediate points. The latter arrangement was considered stamdard for further installation and the system described here.

The cables each containing one coaxial unit with a 5 mm intter conductor and an 18 mm outer conductor were employed for east and west bound transmission.

All the repeaters, including terminals seen and understood to be in place, are underground.

Coaxial Cable Unit ... loss/km at 4 MHz is 322 mN (= 0.322 N) Inner core 5 mm outer conductor 18.5 - 19.0 mm (due to the application of different types (brand) of coaxial cables. General impedance 71 Ω.

Telephone Carrier System:    200 speech channels (90 - 690 kHz). Each transmitting circuit is modulated first at 6 kHz (which apparently serves no purpose except to cheapen the filter designs, all of which are coil and condenser types)


Copper oxide rectifires are employed for all of the modulation and demodulation steps as well as for volume limiting in the voice frequency input of the transmitting path.


With the normal repeater spacing of 35 km. a line loss of about 5 N be expected at 690 kHz.

During the war the Reichspost made use of spiral four and regular quadded cable lengths for temporary repairs in coaxial lines when lengths of the latter construction were not immediately available. Spriral four on a phantom basis was preferred because of the small external field and lower susceptiveness to interference from radio stations.

Televison Systems ... 180 line, 25 frames, to way television between Berlin and Munich and berlin and Hamburg over the coaxial cables in association with telephone cells between the same points. In each of these cities a central studio was available to which the calling ...

Transmission was planned over the Berlin-Frankfurt cabnle to a propsed television broadcasting station at Brocken. ...

... Discussions with Dr. Schriederman (Schiedermann?< AOB) and Herr Zaph of Siemens at Munich on high frequency transformers with wide ranges revealed they have devised one or more than a 4 or 4.5 to 1 ratio between the highest and lowest frequency ...

Breitbandkabel-Formen .. Styroflex cable - quadss Berlin-Hamburg ...

Cable Forms: 21a - 21b - 23a - 23b - 27a -

Vielbandsystem für 200 Gespräche

Vielband - Endamtseinrichtung

Grundsystem 3 kHz Frequenzumsetzung Rel.str. II E 37/1a

Grundsystem 3 kHz Frequenzumsetzer Verstärkerteil Rel. str. II E 37/1b

B-System    Gruppenumsetzer 360 .. 690 kHz    Rel.str. II E 37/2

B-System    Gruppen Trägerstromerzeuger   450 .. 720 kHz    Rel.str. II B 37/5

B-System    Bandträgerstromerzeuger 27 x 54 kHz    Rel.str. II B 37/3

B-System    Trägerstromerzeuger 6 kHz    Rel.str. II B 37/2

B-System    6 kHz Verstärker    Rel.str. II B 37/4

Fernsehn 39    FS-Verstärker 1 .. 4 MHz    Rel.str. II B 35/3



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