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JPRS 74311 
4 October 1979 

Worldwide Report 


No. 93 



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15 Supplementary Notes 

16. Abstract (Lema 2700 words) 

This serial report contains information from the world press and radio relating 
to worldwide political, economic and technical developments in telecommunications 
computers, and satellite communications. Coverage will be worldwide with focus 
on France, Federal Republic of Germany, United Kingdom, Italy, Japan, the USSR, 
People's Republic of China, Sweden, and the Netherlands. 

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17. Mecument Analysis @ Oescriptors 

Wor ldwide 


Satellite Communications 

Electronics and Electrical Engineering 


b Identitiers/Open Ended Terms 

c. COSAT! Fieia/Group OFB, C, F, 17B, 22B 

“Unlimited Availability * UNCLASSIFIED |" "25 
Sold by NTIS 20. Security Cless (This Pege) tis Price 
Soringfield, Virginia 22161 UNCLASSIFIED = 

(See ANS\-239.18) See instructions on Reverse pte a arn 

Department of Commerce 

JPRS 74311 
4 October 1979 


No. 93 


"INDIAN EXPRESS' Editorial on Significance of World Radio 
(Editorial; INDIAN EXPRESS, 17 Sep 79)...ceccccsccccccees 1 

Postponement of WARC Opening 2 


Australian Firm To Lay Indian Ocean Telephone Cable 
(THE AUSTRALIAN, 27 Aug TI cccccccccccccecceececeececeees 3 


Request for Tender on Communications Network Released 


Telisai Earth Station To Begin Operations 


Zhejiang Submarine Cables 
Macao-Canton Communications Talks 


-a- [III - WW - 140) 

CONTENTS (Continued) 


Japanese Minister of Communications Visits 
(Yana Kons cantinova; IMPULS, 31 Jul Fepoocese eeneesee 


Hungarian Remote Data Processing, System Tested in USSR 
(Szilard Sass, Mihaly Koves; MUSZAKI OZLEMENYEK, 

No 2, BOE 0000005000000 060S0S00SS60SS0 OSS CCE ESE 

Successful Development at Communications Factory 
(Peter Eisler Interview; MUSZAKI KOZLEMENYEK, 


The GTT 8000/960 Microwave Radio Relay Equipment 
(Andras Somogyi, Attila Deak; MUSZAKI KOZLEMENYEK, 
No Ze Ly ) POPU TTTTTPTTTTTTTTTTTTTTrTresrereyyrrrrirrT ee 

Paper Comments on Planned Geneva World Radio Conference 

(TAP, 18 Sep TD) 0000000 0000000 0000000000000 0000 COCs 



Radio Terminal 







Delhi INDIAN EXPRESS in English 17 Sep 79 p 6 BK 
[Editorial: "Sharing Radio Waves"™] 

[Text] India has done well to ask for an equitable distribution of geo- 
stationary satellite orbit space and frequency assignments in its propo- 
sals for the forthcoming World Administrative Radio Conference (WARC-79), 
due tv begin in Geneva on September 24. This is only one among the 
several controversial aspects of the existing framework for use of the 
radio spectrum by various services in the 154 member-countries of the 
Internati ynal Telecommunication Union (ITU). 

When the existing guidelines were decided at the 1959 session of WARC, 
most developing countries were unaware of the potential of a rapidly 
growing communication technology and their future requirements. Hence, 
there was little protest from them when the developed countries pushed 
through the “first come first served" principle for use of geostationary 
satellite frequencies and orbit space. As a result, the geostationary 
orbit has become crowded by satellites of advanced countries, while the 
developing countries, who are now keen to launch their own communication 
satellites, are finding it hard to get their due share. For instance, 
India has had to cut down the emission power of its geostationary satel- 
lite planned for 1981 so as not to disturb the transmissions from 
satellites or developed countries already in existence. 

This is why considerable significance is being attached to WARC-79 by 
the developing countries who, for the first time, constitute an over- 
whelming majority in the ITU. What is more, they will not have another 
chance to seek a change in the radio spectrum framework till 1999, when 
the mext WARC is to be held. 

Similarly, India's demand for expansion of shortwave broaccast bands 

will be shared by most developing countries as radio has become the cheap- 
est means for propagating information and ideas. The other proposals on 
sharing of ultra high frequency bands for television networks and addi- 
tional frequencies for radio astronomy are also important. 

CSO: 5500 1 



POSTPONEMENT OF WARC OPENING--Geneva, Sept 24, (AFP)--The scheduled opening 
here today of the World Administrative Radio Conference (WARC) has been 
postponed because of failure to agree on a chairman. Delegation hezds 
will meet on Wednesday to try to settle the problem. There are three can- 
didates for chairman: T. V. Srirangan (India), Derek Rose (New Zvaland), 
and Henry Kieffer (Switzerland). The deadlock is believed to be the work 
of the non-aligned countries, who want Mr Srirangan for chairman. He is, 
however, understood to be opposed by the industrialized countries. The 
10-week conference aims at redistribution of airwaves. [Text] [Paris AFP 
in English 1844 GMT 24 Sep 79 NC] 

CSO: 5500 



Canberra ThE AUSTRALIAN in English 27 Aug 79 p 13 

[Text ] 


i ay 
, Hi i st 

s sit 




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Canterra THE AUSTRALIAN in English 27 Aug 79 p 13 

ee ysis nn | AFL it i 


a ne Ha 

i cane EEURETE FETE Hat aft 

uA ng ‘ae : et nt : 
iia Lee ta yt igual rat 

i ele : iH i nt il 



ETH ih 



work would 
during the 
Clon a 





Kuala Belait BORNEO BULLETIN in English 28 Jul 79 p 10 

See | 8432253 253829795 
Hilti i fle Hier Bini My et 

elt it pall Buu, ii H : nb 
TI Hur By Wiggs l 7, 524 Hist 

ag Pas rare igen 

Fd in il ml tak rh 7 
iit ead fs , 

Hat Minit 4°; til ii 

[Text ] 





ZHEJIANG SUBMARINE CABLES--Three 130-kilometer-long submarine cables have 
been laid recently between Wenzhou anc Dongtou. The cables, linking the 
continent with four coastal islands, have improved communications in the 
area. A PLA unit assisted in the project. [Hangzhou Zhejiang Provincial 
Service in Mandarin 1100 GMT 20 Aug 79 OW] 

MACAO-CANTON COMMUNICATIONS TALKS--A Macao government delegation, headed 

by Eng Aires da Silva, will shortly be going to Canton to discuss with the 
regional authorities there the possibilities for improving telegraph and 
telephone links between the province and the Portuguese territory. The 
delegation will also be holding talks with the Chinese authorities, 
envisaging the study of ways and means of cooperation in telecommnications, 
taking into account the substantial increase--amounting to some 300 percent-- 
in the telegraphic traffic between the two regions. An improvemer: in the 
communications link between Macao and Canton will come following the commis- 
sioning, on 1 August, of direct links via satellite between Portugal's 

far eastern territory and Shanghai and Beijing. [Text] [Lisbon Radio 

in Portuguese to Eu’ ope 1230 GMT 15 Aug 79 LD] 

CSO: 5500 


Sofia IMPULS in Bulgarian 31 Jul 79 p 1 

[Article by Yana Konstan’ va: “Bulgarian-Japanese Cooperation in Com- 
munications" ] 

[Text] Japanese Mini: * Communications Received by Comrade Todor 

The Chairmar of the State Counc!1, Todor Zhivkov, on 26 July 1979 received 
the Japanese minister of posts and telecommunications Nikichi Shirahama 
who was on a friendly visit to our nation upon the invitation of the minis- 
ter, Engr Pando Vanchrv. 

During the meeting there was a discussion of the possibilities of expanding 
profesrional contacts an” cooperation between the two countries in the area 
of communications. 

The meeting was attended by the minister Engr Pando Vanchev, as well as by 
the ambassadors of Bulgaria and Japan, Todor Dichev and Akiro Yamato. 

Bulgarian-Japanese Cooperation in Communications 

Upon the invitation of tne minister of communications, Engr Pando Vanchev, 
a friendly visit was paid to Bulgaria by the Japanese minister of posts 
and telecommunications Nikichi Shirahama accompanied by co-workers and a 
group of journclists from the Japanese mass information media. 

At the conversations held between the delegat' ons of the two ministries, { 
emphasis wes put on their reciprocal desire to establish closer contacts, 

and to make communications a reliable bridge for the constantly broadening 

friendly ties between Bulgaria and Japan in the economy, culture and other 

areas of life. 

The minister, Engr Pando Vanchev, expressed sincere satisfaction from this 
first visit by a Japanese minister of posts and telecommunications to 

Bulgaria and defined it as a step ahead in the development of undoubtedly 
useful relations between the two similar ministries, and that this is in 
accord and with the desire of the governments of the two countries to co- 
operate more actively. He described the structure and organization of the 
communications system in Bulgaria over the immediate and longer-run periods 
of its development, as well as certain problems and tasks presently con- 
fronting communications. The Japanese minister N. Shirahama began his 
speech with thankful words for Bulgarian hospitality. In pointing to the 
high dynamics in the development of Bulgarian-Japanese relations, he em- 
phasized the leading role of communications as a means for maintaining and 
extending friendly and professional contacts. 

Mr Shirahama expressed thanks for the opportunity granted him to become 
acquainted with the activities and problems of communications in Bulgaria, 
and stated his readiness to assist in a closer rapprochement between the 
two ministries and the two countries, as well as in direct and mutually 
advantageous cooperation, the opportunities for which in the area of com- 
munications were discussed at this meeting. 

The talks were attended by the ambassadors of Bulggria and Japan, Todor 
Dickev and ikiro Yamato. 

Mr Shirhama and the persons accompanying him visited the Kopitoto area 
near Sofia where a radio-television center is being built, and he inspected 
certain important sites in our capital. 

The Japanese journalists had meetings at the Sofia Press Agency and at the 
Union of Bulgarian Journalists. 

Prior to his departure from Bulgaria, at the Sofia air terminal, Mr Nikichi 
Shirahama stated: 

"I em very pleased by the warm and sincere hospitality which your minister 
of connunications and his co-workers have shown us. 

"I am particularly happy that I had an opportunity to meet with and be re- 
ceived by the chairman of the State Council of your country, Mr Todor 
Zhivkov. I am exceptionally happy and pleased by the fact that during 

our talk I felt his great confidence and friendly feelings for Japan and 
the Japanese people and a sincere desire for cooperation. 

"Your country is very beautiful. I was enchanted by Mt Vitosha which we 


"In leaving, I take with me the most lovely impressions of Bulgaria." 

‘SO: 5500 



Budapest MUSZAKI KOZLEMENYEK in Hungarian Vol 25 No 2, 1979 pp 83-85 

[Article by Szilard Sass and Mihaly Koves, TERTA (Telephone Factory) ] 

[Summary] "Computer-technology development at TERTA advanced by a major 
step in October 1978: by completing the data-transmission multiplexer 
prototypes it became possible to create complete remote data-processing 
subsystems. After completion of the factory tests, the next step was an 
interministry test set up by the Soviet users. The USSR was the obvious 
site for the testing since TERTA has so far sold almost 2,000 terminals 
to the USSR. Among these was the TAP-2 (EC 8502) dialog batch terminal, 
of which the 1000th was delivered in 1978. The goal of the tests was to 
demonstrate the complex system made up of many types of terminal, to 
demonstrate the operation via actual communications channels, and to 
demonstrat. the run of typical user programs, and at the same time to 
exhibit the multiplexor and terminal test programs developed at TERTA. 
The diagram shows the design of the tested system." 

"The TERTA DOSzTOD remote data-processing system operated with the R-22 
computer in a Soviet computer center under the control of the EC/DOS 
(BTAM) operating system.This article discusses only the system as a whole, 
the TMX-2410 multiplexor (which is a new development), the TETA-1210 and 
TETA-1220 group line wnits, and the TAP-X terminal, since the other de- 
vices are already known to the readers of this journal." 

"In the first part of the test, individual devices and sectors of the 
System (such as the multiplexor, line couplings, communication channels, 
and terminals) were checked, partly from the engineering consoles of the 
devices and partly with the aid of the test programs developed for this 


"During the second stage, the performance of the three user program systems 
demonstrated the usefulness of the system. It can be seen from the diagram 
that the system includes TAP-2, TAP-3, TAP-70, TAP-X, and AP-64 terminals. 
Most of these have already been installed earlier (for example, it is a 
well-known fact that the state data transmission system of the USSR is based 
on TAP-2 terminals). It thus became possible to use it in conjunction with 
various such terminals which, according to the original plans, was not part 
of the actual test." 

"The TAP-X micrporocessor-containing termina] is a new product of TERTA. 
The version that was exhibited operates on the basis of the TAP-70 al- 
gorithm, and was equipped with an alphanumeric keyboard, 1600-character 
display, matrix printer, perforated-tape reader, and floppy disk. As a 
result of the microprocessor-based electronic system it became possible 
to solve user problems in the autonomous operating mode." 

The terminals communicated with the computer via various communication 
channels. In Kiev there were two TAP-2 terminals operating at the rate of 
200 bits per second, connected via two-wire leased telephone channel to 
the remote TMX-2400 multiplexor installed in Kiev. The remote multiplexor 
was connected to its adapter via a leased four-wire telephone channel (the 
remote multiplexor is capable of bundling up to 22 data-transmission chan- 
nels at a rate of 50 bits per second) ." 

"Another group of TAP-2 terminals operated via 200 Baud telegraph networks 
switched with PD-200. The terminals included in the test were located in 
Moscow, Kiev, and Tyumen." 

"The third group of terminals was connected to the computer via the switched 
telephone network of Moscow. This group incouded TAP-2, TAP-3, TAP-70, and 
TAP-X terminals" 

"In addition to terminals from TERTA, the system also included the AP-64 
terminal from ORION. Connection to the multiplexor was provided by a 
four-wire leased telephone channel, using TERTA's TAM-603 full duplex modem." 

"The line devices (TAM-201, TAM-601, and TAM-603 modems; TBA-1 automatic 
calling units, telegraph-line connectors and error protectors combined 
with the TTX-201 automatic calling unit) were built in groups. The func- 
tionally individual subassemblies may be used in their own right or in 
groups.The TETA-1210 and TETA-1220 group line units have a common supply 
unit and an engineering console permitting joint testing." 


"The main feature of the test was the microprocessor-based data-transmission 
multiplexor made by TERTA." 

"The system may be connected to medium and large-size ESER computers (from 
the R-20 and higher) and other computer systems with compatible channel 
(such as the IBM 360 and 370 systems). The connection is made to the mlti- 
plex channels of the computers. The two-channel switch permits connection 
to two multiplex channels also." 

" The system test was carried out in two parts. The first part involved the 
checking of the multiplexor and the terminals for proper operation, using 
test sections. The second part involved the operation of the user programs 
operating under the DOS 2.2 operating system. 

"Three user programs were run in the course of the test and the demonstra- 
tion following the test. Each program executed the data interchange with 
the terminals with the aid of the ESER BTAM." 

"The tests demonstrated the operability of the system. The simultaneous 
operation of the terminals was of interest. Obviously, greatest interest 
was shown in the local multiplexor and the microprocessor-based terminal." 

"The equipment was submitted to the two major Soviet ministries concerned 
for experimental operation. TERTA demonstrated with this test that it is 
ready and able to act as a prime contractor for producing remote data- 
processing systems." 

CSO: 5500 

[Diagram on p 84] 

Fig. 1. The configuration tested 
Key: 1 - Switched telegraph network 
2 - Moscow cuty telephone network 




Budapest MUSZAKI KOZLEMENYEK in Hungarian Vol 25 No 2, 1979 pp 82, 85 

[Unattributed article; interview with Peter Eisler, chief development 
engineer of BHG (Beloiannisz Communications-Engineering Factory) on the 
enterprise's 1978 achievements and plans fcr 1979, as published in 


[Text] [Question] What were the featured tasks in the field of AR pro- 

[Answer] Insofar as the GDR market is concerned, a featured task was the 
implementation testing of the executive program for the register of the 
twin center in Karl-Marx-Stadt; in addition, we also performed work on 

the regional centers andonthe twin centers working together in the GDR. 
These projects went according to plan; however, the success of our endea- 
vors can be determined only after we have handed over the center in Karl- 
Marx-Stadt. This is scheduled for this year. This will be when we find out 
whether we passed or failed the test. 

We can report of major work on the Czech telegraph system. We handed over 
two centers, one in Ceske Budejovice and another in Banska Bystrica, this 
year. This involved additional major development work, thus completing a 
long development project. 

In the area of AR development, we found a new trading partner: We established 
market connections with Cuba. We developed new circuits in the framework of 
our cooperation with Cuba's telegraph system. This project deserves special 
mention since the AR development department developed 16 different circuits 
within a period of only tires months. With the cooperation of the fittings- 
design and the design-planning departments, we completed the manufacturing 


documentation by the end of the year. In my judgment this was one of our 
must sucessful developments last year. Of course, much still remains to 
be done before the first centers are actually installed. 

[Question] Much has been heard in recent times about container centers. 
[Answer] The preparation of this new design was another major activity in 

the area of container-type centers. The prototypes of three centers, each 
with a different function, were finalized before the end of the year. 

[Question] What other developments were worked on? 

[Answer] Adaptation of the ARL line concentrator to domestic conditions 
has been completed. The first prototype is ready; it was given to the 
Hungarian Postal Service for use testing. Among the major developments 
associated with the AR products I mention the mass-caller and electronic 
evaluator designed for Czech centers, which uses a special control unit. 
The equipment has significantly facilitated the cross-callability of the 
Czech centers. The fact that we already received an order indicates that 
the development was successful. The Czech Postal Service actually ordered 
several systems. 

Preparation of a network simulator for the centers of various types used 
in the GDR is in progress for the last two years. Using microprocessors, 
we establish a highly intelligent system, which will help with the trans- 
fer of the centers in Karl-Marx-Stadt. This system, with stored program 
control, represents the latest state of the art. The project will be 
completed in 1979; presently we work intensively on writing the programs 
and program insertions. 

We have emphasized this development right from the beginning since in this 
field we have no tried-and-tested approaches. We do have some difficulties: 
we lack certain equipment such as displays and perforated tape readers- 
writers. We had to find a way for operating without them. The system will 
be tried out this year, when the center in Karl-Marx-Stadt will be finally 
checked out and handed over. 

Insofar as subcenters are concerned, we had to design two new centers for 
all practical purposes: the CA 42 C and CA 102 C types. Since the work has 
been started early in the year, and manufacture is already in progress, 
this was a development accomplished at extra-high speed. 

The universal operating console is completed; it may be used with the 
CA 10002, the KA 5001, and the QA 512 subcenters. Development of the RX 
small-capacity center familiy proceeds according to plan. 


We completed the Type KA 5001 large subcenter for the needs of today's 
market in addition to the planned activities. For all practical purposes, 
this system has an unlimited capacity, and also has a special technical 
advantage: It integrates the advantages of main and secondary centers, 
and may be used as a so-called centrex center. In network cooperation 

it has the characteristics of a main center with very favorable executing 
capability. It seems that this system will be the hit of the future since 
in addition to the above it can execute all subcenter functions which 

are offered in the most up-to-date electronic subcenters available on the 
Capitalist market. Development will be completed next year, and we expect 
to be able to deliver in 1980 already. Since it is assembled from AR 
components, we expect to find a dependable long-time market.The Hungarian 
Postal Service has already ordered several thousands of lines. Let me 
state one more thing: We work on the prototype, the laboratory models are 
completed, and we are ready to start testing. In my judgment this de- 
velopment is a key one for the new year. 

For a special market order we developed the MFC signal-type selection for 
centers of the CA 1002 type. This permits the setting up of a closed- 
target network in conjunction with ARM transit centers, using the CA network. 

Much work was performed in the area of computer-technology applications. 
One such project was the computerized preparation of the external wiring 
of the centers; another was the development of a system supporting the 
preparation of engineering bids. 

[Question] On what developments will you work in 1979? 

[Answer] Some of the ongoing projects will be continued during 1979. Among 
these is the completion of the center in Karl-Marx-Stadt. This will be one 
of the largest telephone installations in the history of BHG. 

Among the new development I first mention two: One is the preparation of 
the conversion of the Hungarian telephone network to eight digits; the 
other is the completion of new types of container center for the Hungarian 
Postal Service. 

[Question] How much advancement i: taking place in the field of electronic 
deve lopment? 

[Answer] In electronic developments one of our major guidelines is the in- 

plementation of experiences already available with microprocessor applica- 
tions. First of all we desire to develop further the network simulator 


designed for the center in Karl-Marx-Stadt. On this basis we desire to de- 
velop an integrated traffic-measuring, traffic-analyzing, and operation- 
monitoring system whicn is badl)} needed for the modern maintenance centers 
already today and which is demanded by the customers. 

Another idea of ours is aimed at eliminating imports. In this field we 
attempted to advance by more daring adaptations. What we mean is that we 
do not take over drawings in a slavish fashion, but we rework them so that 
they conform to our development approaches. This year the first such pro- 
ject is the develovoment of modern switching stations, electronic tarif 
and timing pulse generating system, and replacement of imported central- 
ographs designed for use in conjunction with the APM centers. 

We shall continue with the development of new electronic devices. We start 
with the preparation of an entire family of boss-secretary devices and the 
development of the electronic telephone directory. Insofar as the latter is 
concerned, let me say that we have in mind a pocket-calculator sized de- 
vice in which the most important telephone nuabers can be programmed in. 

As a matter of fact, the second generation will also contain a clock, a 
calendar, and perhaps also an electronic calculator capability. We 

intend to develop the boss-secretary devices in this direction also. 

[Question] May we also expect new developments in the field of design and 

[Answer] We start the development of a new product, namely the relay cap- 
able of being mounted on the NYAK card, in 1979. Another plan calls for 
the adaptation of a miniorganizer system to domestic conditions. Using 
this system, we could reduce the space requirements of our telephone cen- 
ters by approximately 25 percent. 

[Question] Which way are you moving in the area of research/development? 

[Answer] We try to develop further the external wiring; we will also study 
the computer-assisted determination of the wiring of relay bands both of 
direct and conventional type. We will also study methods for measuring the 
service life of telephone-engineering devices, including computer-aided 

We will also try the computer-aided preparation of the traffic dimensioning 
and optimum layout of AR-type centers. This may be very useful in the long 
run since the computer, with the entered data, prepares quickly and accurat- 
ely the entire production preparation and the required documentation. Of 


course, these are complex tasks, which cannot be expected to be completed 
within a short period of time. This subject will be worked on for a period 
of several years. The above-mentioned traffic measuring and operation- 
monitoring system will give us another featured activity: establishment 

of the theoretical fundamentals of the systen. 

CSO: 5500 



Budapest MUSZAKI KOZLEMENYEK in Hungarian Vol 25 No 2, 1979 pp 61-74 

[Article by Dr. Andras Somogyi and Attila Deak, ORION] 

[Summary] "The GTT 8000/960 system is a fully solid-state, heterodyne-type 
microwave relay system designed for the long-distance transmission of up 
to 960 FDM speech channels, or for the transmission of black-and-white or 
color television audio and video signals. The system operates in the 
7725-8275 Miz and 7900-8400 Miz bands, on the basis of CCIR and CEMA fre- 
quency standards. It is a modern radio-relay system, which in Hungary was 
used for the first time in the Hungarian sector of the INTERSPUTNIK system. 
The equipment may be operated in the 0°-50°C temperature range." 

"The networks assembled from the equipment conform to the recommendations 

of CCIR and CEMA. The fully solid-state, partially integrated circuitry 
permits the establishment of highly reliable and easy-to-maintain connec- 
tions. The equipment may be operated with a d.c. supply of -24, -48, or 

-60 B directly, or—using a continuous supply source—with an a.c. network." 

"Trunk connections may be established with the aid of the channel-reserve 

system operating among the medium-frequency points, the remote-control and 
remote-monitoring system, and service telephone ~hannels (omnibus and ex- 

press). The signals of the auxiliary devices must be transmitted under the 
signal band of the multichannel telephone signal. The GIT 8000/960 system 

may be adapted to other standard radio-relay systems or multiplex systems 

both on the intermediate frecuency and the baseband." 

"The radio-frequency and terminal devices were developed at ORION; the 
service channel reserve and remote-control systems were developed by the 
Research Institute of Telecommunication." 


"The following basic services may be realized with the aid of the modems, 
the terminal devices, and the auxiliary devices:" 

"a) Transmission of up to 960 channels of FDM baseband (60 kHz-4287 kiiz) 
together with the pilot of the multiplex device over the individual 
broadband channels. 

b) Transmission of black-and-white or color (SECAM or PAL) television 
programs, with a high-quality music channel. 

c) Transmission of black-and-white or color (SECAM or PAL) television 
programs with four high-quality music channels. 

The distribution of the up to eight radio-frequency channels among TV and 

TF channels may be made in any desired way with one restriction: Since 

the signals of the auxiliary devices are transmitted under the baseband of 

the TF channel, we must provide for the transmission of at least one TF 

channel (together with the common reserve channel assigned to it). 

The GIT 8000/960 system is suitable for the establishment of a trunk 

network. It is also suitable for operating as a branch line of other 

trunk systems. In this case, connection may be at the intermediate fre- 

quency of the baseband, at CCIR-specified levels and impedances. The 
devices are designed for indoor installation; thus they may be accommodated 
in containers also." 

"The following auxiliary services may be realized over the connections:" 

"a) Sector telephone (omnibus) channel, which establishes connection between 
two baseband stations (modem sector) and all repeater stations between 

b) Up to three express (long-distance) channels, which establish  connec- 
tion among main and terminal stations by means of calling over the 
entire length of the microwave chain. 

c) Remote control, with the aid of which up to eight stations may be hand- 
led (remotely controlled and monitored) from a center at any end of 
the microwave chain. 

d) Intermediate-frequency channel reserve, which provides pretection from 
equipment malfunctioning and fading, and which provides up to two re- 
serve channels for six operational radio channels. 

e) Baseband reserve, wherein one or two operational modulator(s) or de- 
modulator(s) have one reserve each. 

Transmission of the auxiliary services (a-d) is under the 960-channel base- 

band in the 0.3-54 kHz frequency spectrum. Baseband reserve requires no 

return-direction channel; thus, it can be realized in case of simplex TV 
transmission also." 


"System-Engineering Features of the Design" 

"A) As a result of the increased transmission capacity (960 channels, com- 
pared to 300 channels in the earlier design), the system parameters 
had to be increased; specifically, the transmission power for the sys- 
tem to 700 mW, the signal-to-noise ratio to 7.0 dB. Accordingly, of 
the noise level allowed by CCIR, 3 pW/km, we utilized 1 pW/km for the 
incoming-level noise at a fading of S dB. 

B) In order to reduce the transmitter-recciver noise (local noise), we 
selected the base oscillator frequency of the receiving locale at 
approximately 125 Miz, and we installed a noise-cutting invar UHF 
filter at approximately S00 Miz. 

C) In order to reduce the echo-type reflection noises, we designed the 
interfacing of the individual connected devices in such a manner that 
the total of the collision dampings became 50-60 dB. By using a novel 
antenna type and a circulator with improved parameters, we reduced the 
reflections originating on the feedline. 

D) In order to reduce the intermodulation noises, we designed novel so- 
called resistor-coupled amplifiers. As a result, those transmission 
distortions which arose because of the simultaneous presence of the 
running-time curvature and conversion were eliminated. It thus became 
possible to provide low signal-to-noise ratios over a wide AGC range, 
as outlined in Item 1. Reduction of the level of the intermediate- 
frequency upper harmonics gave us improved intermodulation noise con- 
ditions (especially at the limiter inputs). 

E) Changes in temperature significantly affect the transmission character- 
istics. As a result of the frequency shift of the microwave filters 
tuned for room temperature for amplitude and running time (if the fil- 
ters are made of copper or aluminum), the running diagram and the am- 
plitude characteristic will tilt. In the case of several stations con- 
nected in series, the faults add up quadratically, insofar as the over- 
all effect is concerned. For this reason, the system would no longer 
conform to the noise provisions of the standards governing multichannel 
telephone systems if the transmission line is long and there are a few 
degrees C fluctuations (for example at sunrise or sunset). It therefore 
became necessary to use invar microwave filters in the three-cavity, 
four-cavity, and five-cavity cases. 

F) In order to eliminate the systematic noise cumulation with consecutive 
sectors, we separated the correctiag system into several parts. 

- The -t corrector following the main amplifier is called upon to correct 
the major part of the running-time distortion of the repeater station 
(transmitter-receiver filter-change filters channel filters for ident- 
ical and adjacent channels, intermediate-frequency filters). This is 
where the entire carrier-frequency amplitude correction also takes place. 


- The running-time corrector in the transmitter intermediate-frequency 
amplifier primarily corrects the "transmitter-mixer with filters" 
unit; however, in some sectors noise compensation can be realized 
by joint tuning with the main corrector. 

- The active running-time corrector in the intermediate-frequency output 
amplifier has as its basic function to jointly correct the moden; 
however, in the case of several sectors it may also be used as the 
“accumulated running-time corrector." 

- The corrector in the intermediate-frequency modulator jointly corrects 
the transmitter limiter and the modulator. 

G) In order to improve the quality of the TV picture and the auxiliary 
audio carriers, we designed highly stable, low-noise circuits. 

H) To improve the overall efficiency, we used converters with a switch- 
ing frequency of approximately 200 kHz in the MODEM and TV terminal 
devices. The modulatable base oscillator supply unit accommodated i» 
the SRF frame is similarly constructed. All devices may be operated 
from ad.c. voltage of -24 V, -48 V, or -60 V." 

"The Frequency Plan" 

"The frequency range of the 8 Giz frequency permitted in Hungary for 
medium and large number of channels is, according to the first Canadian 
amendment of CCIR 386, 7725-8275 MHz. ¢ 

The following are the main characteristics of the raster: 

- Up to 1,800 telephonic information channels, or an equivalent load, 
may be transmitted over the individual carrier frequencies. 

- The frequency separation among adjacent channels operating for the 
same antenna in the same direction is, under identical polarization, 
59.3 Miz; under opposite polarization, 29.65 Miz. 

- The distance of the center gap is approximately 104 Miz; this vas 
chosen since we left a 50 Miz gap for satellite communications. 

- There are provisions for the use of a shifted frequency plan." 

The functional parts of the system, for which the major engineering data 
are presented, are the following: 

A) Antenna and feedline system 

B) Radio-frequency transmitter-receiver and switching circuit 

C) Channel-reserve system 

D) Automatic modem frame 

E) Television terminal 

F) Service multiplex system 

G) Remote-control system 

H) Express long-distance telephone system. 


Captions of the illustrations: 

Fig. 1 - The frequency plan 

Fig. 2..- The block diagram of the SRF-8 frame 

Fig. 3 - Tre block diagram of the aodem frame 

Fig. 4 - The block diagram of the television terminal 

CSO: 5500 



Tunis TAP in English 1405 GMT 18 Sep 79 LD 

["Pool" item; from the press review on the World Administrative Radio 

[Text] Tunis, 18 Sep (TAP)--Commenting this morning the International 
Conference of Radio Directors which will open in Geneva within a few weeks 
under the sponsorship of the 1.T.U., LA PRESSE writes notably; “at the 
Geneva meeting, the African, Asian and South American developing countries 
intend to claim a broader access to the radio frequencies. These frequen- 
cies being given for 20 years, the outcomes of these Geneva proceedings will 
certainly be essential for the future. The problem lies in the extremely 
rapid development of the wireless communication means. The developing 
countries needs increase to such a pass that the number of frequencies 
devolved to the third world becomes insufficient and handicaps the expansion 
of their own means of communication." 

"Thus today 10 percent of the countries of the world disposeof 90 percent 
of the frequencies and the third world wants to put an end to this western 

monopoly. It is a question of justice and balance in the international 
relations, concludes the paper. 

CcsO: 5500 




RADIO TERMINAL--Addis Ababa, 10 Sep--Ethiopia Sunday inaugurated a Japanese- 
built ground radio terminal for communications satellites in suburban Addis 
Ababa. The yen 1.4 billion terminal, built by Nippon Electric Co and 
Mitsubishi Electric Corp. can connect a telephone call from or to Tokyo 

within a few minutes through the communications satellite stationed over 
the Atlantic Ocean, it was reported. [Text] [Tokyo KYODO in English 
0815 GMT 10 Sep 79 OW) 
CSO: 5500 END