KABELWERK OBERSPREE (KWO) CABLE PRODUCTION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00810A000900270003-0
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: September 21, 2009
• Sequence Number: 3
• Publication Date: April 17, 1953
• Content Type: REPORT

Approved For Release 2009/09/21: CIA-RDP80-0081 OA000900270003-0
CENTRAL INTELLIGENCE AGENCY
INFORMATION REPORT
Kabelwerk Oberspree (KWO) Cable
Production
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SECURITY INFORMATION
COUNTRY East Germany
This Document contains information affecting the Na-
tional Defense of the United States, within the mean-
ing of Title 18, Sections 793 and 794, of the U.S. Code, as
amended. Its transmission or revelation of its contents
to or receipt by an unauthorized person is prohibited
by law. The reproduction of this form is prohibited.
REPORT
=ATE DISTR.
NO. OF PAGES
REQUIREMENT
REFERENCES
THE SOURCE EVALUATIONS IN THIS REPORT ARE DEFINITIVE.
THE APPRAISAL OF CONTENT IS TENTATIVE.
(FOR KEY SEE REVERSE)
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of vulcanized and unvulcanized rubber layers. The ozone-resistant rubber
mixture used is sulphur-free and contains essentially, besides natural
rubber, kaolin and paraffin.
c a The cable is built up thus. a rubber coating is first sprayed onto the
insulated LT core for the glow discharge cathode (Glimmkathode). The
double-cored-cable thus formed is then given a HT conductor in the form
of a copper mesh (Kupfergeflecht)o Further layers are then banded ona
The innermost layer of rubber now coming onto the cable and touching
the conductor, as well as the outermost layer of rubber, are.of the unvu.lcanized.,
sulphur-free ozone--resistant sort. Between.. this inner and outer layer
are alternated layers of vulcanized. and unvulcanized rubber? Finally,
a.metal protector is added, and on top of this a black yarn (earn) layer.
do The basic new development in this cable lies in the fact that the
cable has not been sheared., as has been done previously, but coated..
2. High frequency corrugated. cable (R.illenkabel)
a. High frequency telephone cable (Fernsprechrillenkabel). Three sorts of this
cable have been developed. by KWO, but only one was ever produced by them.
This is cable type Ri.llenk,bet 5-5/18, It is constructed as follows
1. Ozone-resistant cable
a.. Development work has been brought~to a successful conclusion and the
principle is being used in X -Ray cable, which is being manufactured
for domestic and export needs.
b4 . The problem of ozone-resistance has been solved by the intercalation
25 YEAR
RE-REVIEW
STATE .x ARMY Ey X NAVY x AIR X
(Note: Washington Distribution Indicated By "X"; Field Distribution By "#".)
I AEC ORR E
1.7 April 1953
Approved For Release 2009/09/21: CIA-RDP80-0081 OA000900270003-0
 Approved For Release 2009/09/21: CIA-RDP80-0081 OA000900270003-0
SECRET/C=OL - U.S,, 0i3FICIALS ONLY
Bells-of trvlitul about 18.moo in d?ametey are drawn.. over a conductor
a _ solid-zapper or plated aluminum: of 5.5 mm. diameter. The bells
are coated with styroflex foil so that they will hold together,
Two half shells of copper strip sheet about 0.4 mm. thick are
--p laeed: -over the -styrof lex coating. These shells are corrugated and. shaped
by mach-ine. . These copper shells form the second. conductor of the cable
Over the-capper shells is placed a binding of oppanol (-ece th) Finally,
a fabric tape and a steel wire mesh as ; echanical protection-are add d.
The use of the trolitul bells.is not always .:feasible because of the material
coating and inadequate stability. There:fore~another cable with ceramic
subtances.as dividers has been developed, This new cable has.asmaller
diame er, both with respect to the conductor and-the shells: 2.1k- x 9, 6.
The corrugation is .distinguished from that of -the first, cable, however,
in that .here, through a .special process, the ceramic substances, about
3 m . thick - -consist . of F.requenta; so ii ibedded in the ,corrugating of the
sheet =shells .that the ..space. between them is about .2.5 mm. . This process
1S.-known -am,'as 'cken" -.( seaming) . A seamed sheet is called the second cable
conductor.- In manufacturing,.the seamed parts of the sheets (the shells)
are held. together by clampsFurther constriction with oppanol, etc., is
the same as in the tr.olitu.l bell cable.
The second corrugated cable, developed for the same purpose with .ceramic
substances, has an aluminum-duct in the copper sheet shell that is
.metalized with the cable press. Thus the ceramic parts are held apart
through the aluminum duct in the certain desired distances.
The cable is for a ..wave -length of 20 ems. About 10.- 20 1=s of trolitul
corrugated,cable was delivered to.Sachsenwerk, Radeberg, in 1951.?.
Antenna cable This is in general similar to the above, but the dimensions are
greater,, the outer diameter of the cable of this sort produced in late 1952
was about 100 mm. Further work is being done on this . cable It. is -only
known in this connection tli t it has been possible, through the .use of a .coolant,
to reduce the diameter to 50 .mm (outer diameter). Another cable is under
development with an even smaller diameter. This will have no.air spaces
and will use oppanol as an insulator. It will not be suitable, however,
. for . very high power usage.
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Approved For Release 2009/09/21: CIA-RDP80-0081 OA000900270003-0