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Multiplexutrustning TM-1

Carrier telephone system for 1 + 16 channels type STR 113/22
 

Tillverkare N.V. Philip´s Telecommunicatie Industrie, Hilversum Nederland
 

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Utdrag ur originalbeskrivning fastställd 1/4 1958. Från krigsarkivet.

Introduction

General

The STR 113/22 carrier telephone system is designed as modulation equipment for sixteen telephone channels and will be mainly used in conjunction with radiolink equipment.

In addition to the sixteen channels which are modulated a v.f. channel may be used. Speech in this channel is not modulated in the carrier. For this reason the total number of channels is given as 1 + 16.

Two 8-Channel groups are formed in the transmitting section of the system. The eight channels of a group are each modulated with a channel carrier (12, 18 …54 kc/s), after which only the lower sidebands are passed by the filters. These lower sidebands are combined, resulting in two groups in the 6 … 54 kc/s frequency band.

One of these groups is modulated with 114 kc/s resulting in the 60 … 108 kc/s group as the lower sideband. This group is combined with the other group (6 … 54 kc/s) so that the 16 h.f.channels occupy the  6 … 108 kc/s band (see frequency allocation, ND 044 68e).

The frequency band of a speech channel is 300 … 3400 c/s, whilst the channel carrier spacing is 6 kc/s.

The installation is suitable for the transmission of D.C. signalling impulses from an automatic exchange. A 4300 c/s signal is used for signalling within the channels; this is, of course, outside the speech band.

An additional relay set is provided for each channel by means of which it is possible to connect a number of magneto subscribers' sets or a magneto exchange direct to the carrier telephone bay. In the case of automatic exchanges these relay sets are put out of service.

The v.f. end of the system can be adapted for two-wire or four-wire operation. For this purpose each channel unit contains a hybrid transformer with line balance.

The amplifiers in the transmitting section of the system contain a circuit by means of which equalization of part of the cable can be obtained. The equalization of the remaining part is effected in the receiving amplifiers of the other terminal station.

The equipment is mainly housed in units suspended from the bay. The rack consist of a number of steel struts with cover plates and mainly contains wiring, fuses, terminal  blocks, a number of panels with equipment permanently connected to the bay wiring and a number of receiving relays for signalling.

The units are sealed by means of die-cast covers, so that the components in these units need not be canned separately. In this way the components can be mounted compactly and are easily accessible.

The use of ferroxcube as core material for coils and transformers made it possible to keep the units fairly small.

The connections between the unit wiring and the bay wiring are established via contact blocks mounted on the units and the bay.

The entire equipment is finished in light-grey lacquer.

The equipment as a whole can be divided into three parts:

• Transmission or system equipment
  This term includes all the equipment in the transmission path.

• Carrier supply equipment
  This equipment generates the carrier frequencies used to modulate the speech signals.

• Power supply equipment
  This equipment supplies supply voltage for the various units.

One terminal bay (STK 533) contains equipment for one complete system, in other words 16 h.f. channels with a relay set for each channel, one v.f. channel, carrier supply equipment and power supply equipment.

Technical data

Levels and impedances

 

H.f. output, transmitting end (system)	-4 db max.	150 ohms
H.f. input, receiving end (system)	-38 db min.	150 ohms
Signalling level at a point of relative zero level	1 mW  -6 db
Intelligible crosstalk attenuation between two channels	≥65 db
Noise in a channel at a point of relative zero level	<-65 db

 

Power supply
Mains voltage	220V A.C. ±5%
Mains frequency	50 … 60 c/s
Power consumption	about 500 VA
Dimensions of the STK 533/11 bay
Width	520 mm (20½")
Height	2010 mm (6' 7")
Depth (with units)	290 mm  (11 3/8")
Weight	about 420 kg (924 lbs)

Drifterfarenheter

Vi hade Philips TM-1 med 16 BF-kanaler på ett stråk med RL-14. Den var helt rörbestyckad. (E83F,E81L om jag inte minns fel) Många lufttäta burkar, en del var bestyckade med ett eller två rör. Burkarna hängde på en klack och hade stiftanslutningar i nederkanten. Detta system användes även i efterföljarna TM-12 och TM-22. Inuti burkarna fanns en avfuktningspatron med silikagel fastgängad (liknande E14 glödlapa) mot chassiet, Vi torkade patronerna i elspisens ugn när patronens fönster visade att den bytt färg, indikerande fukt.

Dessa muxar var så tidiga att CCITT normer ej användes, vill minnas att signaleringen låg på 4,3 kHz. Under nedre radens burkar fanns tomma platser avsedda för ev. 2-trådsenheter. Vi hade inga sådana.

Kraftförsörjningen var nederst i stativet. Elektrolytkondensatorerna för anodspänningen var monterade på oktalrörsocklar (samma som t.ex. rör 6V6) så dom snabbt och enkelt kunde bytas.

Ett stort antal mätpunkter fanns för ström, spänning och nivå. Omkopplare och mätsnören användes.

Driftsäkerheten var bra, fick byta nedgångna rör ibland. På slutet även glödlampor i oscillatorernas nivåstabiliseringskretsar. Orginaldelar fanns ej men vi provade oss fram med olika typer av indikeringslampor. Har sett ett ex av TM-1 i Flygvapenmuseum (gamla sexan på Malmen) förråd för många år sedan.

Sammanställt av Roland Persson

Senast uppdaterad 2014-03-06

Källor:

Utdrag ur beskrivning, fastställd 1/4 1958

Drifterfarenheter från Bengt Eliasson