STATE OF DEVELOPMENT IN COMMUNICATIONS ENGINEERING

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00247A000900580001-7
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 7
• Document Creation Date: December 27, 2016
• Document Release Date: January 28, 2014
• Sequence Number: 1
• Publication Date: July 30, 1964
• Content Type: REPORT

Icnyi
Declassified in Part - Sanitized Copy Approved for Release 2014/01/28: CIA-RDP80-00247A000900580001-7
INFORMATION
CENTRAL INTELLIGENCE AGENCY
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This material contains information affecting the National Defense of the United States within the meaning of the Espionage Laws, 'nue
18, U.S.C. Secs. 793 and 794, the transmission or revelation of which in any manner to an unauthorized person is prohibited by law.
CONFIDENTIAL
NO FOREIGN DISSEM 50X1 -HUM
COUNTRY
SUBJECT
DATE OF
INFO.
PLACE &
DATE ACQ.
Czechoslovakia
State of Development in Communications
Engineering
REPORT
DATE DISTR.
NO. PAGES
REFERENCES
-HUM
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:80 JUL 1964
1
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THIS IS UNEVALUATED INFORMATION.
SOURCE GRADINGS ARE DEFINITIVE. APPRAISAL OF CONTENT IS TENTATIVE.
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a five-page survey of Czechoslovak commun-
ications engineering
the report appears to have been prepared by a person conversant with
Bloc communications developments and may have some use as a ready reference.
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C ONFIDENTIAL
NO FOREIGN DISSEM
STATE I DIA I ARMY # I NAVY # I AIR # I NSA # I AID
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GROUP I
Excluded from automatic
downgrading and
declassification
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(Note: Field distribution indicated by "*".)
1_ Declassified in Part - Sanitized Copy Approved for Release 2014/01/28: CIA-RDP80-00247A000900580001-7
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Declassified in Part - Sanitized Copy Approved for Release 2014/01/28
: CIA-RDP80-00247A000900580001-7
Declassified in Part - Sanitized Copy Approved for Release 2014/01/28
: CIA-RDP80-00247A000900580001-7
Declassified in Part - Sanitized Copy Approved for Release 2014/01/28 : CIA-RDP80-00247A000900580001-7
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? CzechoslovalticIr
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Communication .unginoering, State
Of Devolepment
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Communi9at*A.MAiR2ari74a
1. The available communicationsequipment ha u been improved and
further developed.
2. In the arst place, t!ran?sistorization has been carried though
very consistently, whereby reducTions in dimensions, weight rind
power consumption as well as optional battery operation were
realized in most cases. Regarding the U36 of semionductors,
Czechoslovakia definitely holds the first place among all
Soviet Bloc countrieo. The building block priaciDle on the
basis of printed_gicult plateT generally prevails in the,
construction of equipz,ent resulting in an increase of
reliability and a reduction of maintenance requirements.
3. The trend in world communications towards hUher frewencx
.ranpps has also been followed - successfulfy y -'zecho-
elovakia. Where appropriate high-frequency semi-conductors
are not yet available, the Czechoslovakian industries can go
back to reliable microwave electron tubes? which are available
in sufficient quantity and for all applications (from the
"Scheibentriodeu (disc triode) to the carcinotron).
4. With respect to development and production, the most important
enterprise of the Czechoslovakian communications industry is
the State-owned factory Tesla. Whereas research and development
have been more and more concentrated in the Prague plants, the
Tela production plants are located in all parts of the country.
5.? Within the framework of popEcoN decipions: Czechoslovakia is to
(and wants to) take over The production Of large telephone
exchange installations (with tha ezcept ion of PB1.-n) as well as
of radio transmittets (with the exception of ship radio
installations) of all newer ratings. So far, oilly Poland has
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CONFIDENTIAL
. NO FOREIGN DISSEM
? . :
GROUP I
Excluded from Automatic
. Downgrading and Declassification
Declassified in Part - Sanitized Copy Approved for Release 2014/01/28: CIA-RDP80-00247A000900580001-7
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x'enounced transmitter building. The Soviet Zone of Germany
(Kdoenick Radio Plant) has not yet discontinued the production
of transmitters,' but has considerably limited the produotion
of large switchboards.
t'S 4 4
Wire L.o:Ilmu.n.Lcac_Lons
Decisive technical advances :have not been made in the
field :of wire telegrpby. The new developuents of the pre-
ceding year have been imroved, their ocrational reliabil-
ity has boon increased, The crosba-P system, which, in 1962,
was firSt employed in the P.AX.USK 5/25/41 is now also being
used at post office exchnges. iAoreover, this system is on
the way to be introduced in the exchanges used for the trans-
mission of radio and television broadcasts.
The Tesla p,udip-:frequency_londistance_dialling,s;ystem DVT 54
/(four-wire JITcaiTs without atten1=7, from connection
to branch connection) for two-way automatic through and
terminal traffic (audio frequency 2,280 c/a) between railroad
central and branch telephone offices was im)roved too.
Since recently, oush-button switches have sometimes been
installed in railroad telelhone inst.alations instead of
dials,
9. The satisfactory test's made in the preceding year with
2arely electronic dialliu systems seem to have been dis-
continued. TETtest7-modols 'have disag2peared, Only the
prototye of a semi-electronic ringir41 and signallina
installation was shown. However, in the fall of 19 , no
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decision had yet beei. reached whether this installation
was to be produced in series.
10. In Czechoslovakia, telephone and telegn,ph long-distance
diailln bet.een cities (throh diallina), at present,
only exists on a small scale and is of experimental nature.
A system for automatic .throuah.diallinr!:.from one country
to another is under construction - at present between
Prague, 'Aarsaw, ,c)scow and East Berlin. The. East Berlin
echanLe, which was designed by Czechoslovakian experts and
equipped .with TesIa installations, is to be completed
this summer, The 'flarsaw exchange will probably be completed
in the fall of 1964. The :!.oscow and, at it, the Prague
exchange will follow Tesla hooe that it will be .possible
to start official through-dialling traffic between the
above four cities L,s early as in the fall of 1965,
NO IMIGN DlEE
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Clarl'ier-Freluencv and Radio Enc;ineering
Some developments and improvements, above. all in the
wodernization of tube co..iclement, can also be mentioned,
-Alt1',oil-rh they are not very iiortant in the field of
remote,-action techniuyes and carrier-freouency transmission
, r,
nxpa-t=easion lines ..11; ue-enonyj. 3-oqucn i'
used, noweVerf is T=well proven and reliable sinle-
sideband system J.VT2 (Tesla). On the low-frequency side,
the TIT-Tcan work with dynamic compression and/or expansion,
tbus attaining a very hi0nal-to-noise ratio. Due to
their circuitry, all Tesla... system6 require only about
half of the frequency width of other system, includbA6
some estern equipment, and, at the same ti,ne, can carry
even more reote-actioil channels.
i)artial transistorization is still in the Pxperimentall:
sto.ge with the Tesla remote-control units DSO 1. and D502,
It has not yet been completed.
kor the transistorized carrier7freacy,teleohonen
ENK 6, Tesla transistors are now used insteyd of imported
transistors (partly from Japan) installed until recently.
The radio relay instuLlatIon. W.P 11 r-.-1(re 8,050-
,
8,650-1lic/s, transmitting power 100 or 600 .m.?:) and the
:tactic oi-o-ucastme I:patio:ex RM 22 (carrier
ciesg 3,3 - 3-9 - 4.5 - 5,1 - 5.7?- 6.3 iii.c/s), which were
introduced as' novelties, were already available as proto-
types in 1962, however, series production (with some
technical inrovements d1d not start before the spring
of 1963..
The radio relay system DT .21, which is in use with man::'
radio 775-ay links, is to be replaced by the successor .
type DT 22, the prototype of which was shon by Tesla in
BrUnn. The new installation is Said to be irfore powerful and
able to link -distances of up to 100 ka without' the use of
.a relay station.. The DT-22 installytion is designed for
automatic operution. UP to four unmanned relay stations
can be reached and remote-controlled by one control station.
A genuine novelty is the Z4V?1-4 rece.iving_installation with
automatic volume control. This double-diverSity-system, which
was shown as :a prototype, is designed for the types of -
service Al to A4 ,.F1, F4 and F6 and covers the frequencies
from 1.5 to 30 :.c/s in six rar!re.
Radio .Broadcasting
o
In -izecnoslovaia, as in all other countries, t,..1.-npistoried.
broadcast rec6jvers'are'very pry:pular. In the.faff.1 of 1963,
however, production..could not .always satisfy the demand.,
because HF transistors' 'were nntavailable in. Sufficient
Quantity.' The. available 'c Lion outut was first of all
used for non-private equipment, and only the small remain-
der of ill transistors was then released for broadcast re-
ceivers., There are, however, some models of portable re-
ceivers v4hose nY staes are ecuip-ped with imported tran-
sistors, mainly of Japanese origin. The oroduction rate
-.MREIGR 'c' 'q
Declassified in Part - Sanitized Copy Approved for Release 2014/01/28: CIA-RDP80-00247A000900580001-7
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is poor, as, due to the foreign-exchange situation, the
allocationsof imported transistors are very limited. Thus5
transistorized radio receivers are hardly available on the
market.. RoWeverithere is good reason to believeithat the
bottleneck will have been overcome by the summer of 1564g
in Rormov additional production. lines are being installed
to speed up -pi-eduction of UF transistors.
18. In addition to six transistorized pocket and portable sets,
a transistorized table set is manufactured in two model's,
differing in their frequency .ranges..A-small percentage of
these table sets is equieped for - VHF -reception.'
19. The new pocket.receiver-*2810-B for HP, MI', LP and VHE ?
operates vITE-77111777nsistors and five diodes, :the output
poor being about .750 ia The dimensions are 27.5 .-xs16,5 x
8 cm. The new pocket :receiver 2809 B.for HP, ;T and
operetes? with seven -UTnsistors and 'two diodes, the output
power being 750 1.1 The dimensions are 28 x 17.5.x '75., cm
The -smallest. traneistorized -set available (22 x 16 x-7cm.)
is the model 2803_B for and LF, equipped with seven:
transistors 761a one diode,
PO. The leng-frequency range of all receivers, including the
non-transistorized typos, lies beteqn 200 or 1,000 and
21000 meters, the medium-frequene:v range generally between
187 and 570 meters. High-TreqUency sets operate in a band
ranging from about 19 to 72 meters. Eor receivers with two
high-irequency ranges, separation is .at about 37 meters.
Sets with only one high-frequeney re.ne preferablV-Operate
between 17 and?50'meters. IMP devices: are designed for :-a
-reception r-nge bet,eeen 4.58 -(or- 3,43 ?and 3) MetpT80
21. All broadcast receivers are eroducts of the Tesla plants.
In their basic circuitry as cee,l1 as their receivine:poeer
they are O), eeroximately equal to hestandards of the corre-?
spending estern units. As a.rule,fihesse in circuitry and
special tuning aids are .not provided, whereas the.Medha-eical
quality is good. All portable transistorized sets are too
big and too heavy.
?22. A negligible portion of the receivers is exported, above
all to the- Liddle East. .A small number o1. mains receivers
is supplied to Federal Geran department stores and. Mail
order houses.
Television
23, ? 'what was said before about the Czechoslovakian broadcast
sets, is, more or less., also true .for the czechoslovakialv
television receivers, which are. built in six models, also
exclusively b Tesla. In their basic circaitrv as well as
the shape. and, finish of their cabinets, the Czechoslovakian
television sets are similar to Western designs and patter-As.
'Ihe mechanical quality and :the ,layout are, more or less, of
the same standards as Yvestern ?.oroduets, 10 e'er partial
transistorization of the Circuits has not yet been stIlted,
and the television sets, like the broadcast sets., are lacking
NO 1:'OREIGL1
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every finesse in circuitry and all extra tuning aids.
The receivers are built with 12-channel selectors in
accordance with OCIR or OIR Standards. About half of
them are equipped with 43-cm eicture ubes the other
half with 53-cm tubes (deflection 110') At present,
59-om tubes are not envisaged.
24. For television studios, Tesla developed a camera
chain of very high standards regarding cireuitry and
mechanical quality. This ?camera chain includes
sumazthin camera TKO 401 with electronic viewfinder,
lens turret and aneaure are provided with remote control;
camera control unit TJK 401 supplying two blanking and
synchronizing signals of 1 Vr. / 75 Ohm and two video and
blanking signals of 0.7 Ve,/?75 Ohm, Dcw2x_pack TX 40/
for the camera and the coiltrol unit. -she first develop-
ment model of the camera had already been built in 1962,
Production of all three units was started in the summer
of 1963.
25. The s nchronizinpzEigEal gall911i12r PGS 401 for outside
broadcasts and television studios and the monitor Tmo 401
are also new developmente. The TGS 401 generatee line
synchronizing, equalizing and video synchronizing pulses
as well as horizontal and vertical blanking aulses.
Although all the afore-mentioned equidaent was primarily
developed for installuent in the television 0.13, van of
type TQ2 601, it can be used for stationary studios as
well.
27. The electric and transmitting equip/lent of the telegn
0.B. van TC12 601 was considerably improved airing the
last year. Eight vans of the modified type have already
been completed, another five are being built.
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Declassified in Part - Sanitized Copy Approved for Release 2014/01/28: CIA-RDP80-00247A000900580001-7