SE-213 / TLD / Tragbar Leichte Dezimeterstation
überarbeitet am 8.9.2010
It was not before the World War II years, when interest in using high
frequencies in the VHF range for communications arose also in Switzerland.
Because of the good results in practical use with the troops with the TL station,
the concept of the TLD station was very similar with it's portable components.
Brown Boveri delivered seven prototype stations with the designation SET 9/2 in August 1943; from the definite version with BBC designation SET 11/2 a houndred sets have been ordered in 1943 and another fifty stations in 1944. Because of production delays in the war years (problems with valve supply due to the War and export restrictions caused Brown Boveri to produce th R.F. pentode P2 in Switzerland), the station came in service not before the end of WWII in Mai 1945.
The TLD found no good resonance with the troops: the station suffered from very frequent dropouts mostly from bad contacts at the tube sockets. Insiders knew, that the valve contacts had to be cleaned with a metal brush or the Swiss pocket knife before switching on the station. Another problem was the fact, that with the standard setup, the station could transmit only one channel. The Swiss Army had ordered far too few of the multichannel adaptors - so the TLD was not found very useful in practical use: there was no service communications line to be used in parallel with the main operative communications channel.The station has been in use until 1960, it has been used for point-to-point connections only. Only with the introduction of the successor, the Brown Boveri made MT 3, microwave communications has found more frequent use with the Swiss Army.
The TLD is capable no only of telephony but also of radioteletype connections with the letter printer ETK, in connection with some encryption equipment, automatically encrypted communications were possible.
The main part of electronics is located in the transceiver case, the high power
oscillator with the two LD1 finals is located in a small case attacked to the
On the transceiver's front panel, You find next to the station clock the
frequency dial, just below the main tuning knoband the mechanical tuning lock.
The modes switch is located below the colume control.
The power supply delivers all necessary heaters and anode tensions,
in the accessory drawers, You find a lamp socket power adaptor (the searched-after
adaptor that can be screwed in a lamp socket with two power sockets) and some spares.
© 30.05.2010 Martin Bösch