überarbeitet am 26.12.2007
After tests with the first low power set using the VHF range, there was an increasing
demand for communications equipment using duplex and multichannel technology.
In 1942, Brown Boveri started development of a microwave wireless set, the so-called TLD
(tragbare leichte Dezimeterstation = "portable light decimetric wave station").
Because of lacking supplies of some Wehrmacht tubes, BBC manufactured the necessary three types
of valves in their own plant - but the set could be used for reliable operations not
before the end of WWII when German made tubes became available again.
In the seventies, the not very popular "dinosaur" has been replaced by the portable
sold state multichannel microwave communications unit R-902 - the Swiss Army relied on this
for many years.
Microwave Communications Technology
|Dezimeter - Kleinstation K-Dm
"Dezimetric wave miniature set K-Dm"
Hasler H223b (1942/45):
440 - 517 MHz, CW, AM, Pout 1 W;
portable "backpack" set, battery powered
|Tragbare leichte Dezimeterstation TLD
"Portable Light Dezimetric wave Station"
BBC SET 11/2 (1945/47):
330 - 355 MHz, FM, Pout 2W;
microwave communications set for single or multichannel duplex operation; telegraphy / telephony,
radio teletype, optional ciphering unit
|Richtstrahlstation UKR / RB
BBC IM 23b (1957?):
1,85 - 2,15 GHz, FM, Pout 50 mW;
Complete station consisting of five racks: Transmitter/Receiver, Service
communications channel, Channel distributor, Channel collector, Ciphering unit.
The completely valve equipped station could be used for a total of 11 duplex
telephone connections, in 1970 this station has been improved with partly
solid state technology and a ciphering unit has been added.
|Richtstrahlstation R-901: Prototype !
STR (Standard Telephon Radio, Zürich) (1957):
325 - 400 MHz, 6 channels, only prototypes for test use
"(Small) Microwave communication unit R-902"
BBC MT 4 (1967/77):
7,78 - 8,1 GHz,
Microwave communications station, 15 channels duplex operation,
four multi-channel unitd could be added to reach 60 speech channels,
around 1988 a digital ciphering system has been added.
"(Small) Microwave communication unit R-905"
14,6 - 15,2 GHz, microvave communications set, used with ciphering unit
STR (Standard Telephon Radio, Zürich) (1976/1995):
4,4 - 5 GHz, microwave communication unit, 60 channels
Alcatel Schweiz AG (1997/1999):
4,4 - 5 GHz, microwave communications unit