SE-212 / TL BBC
überarbeitet am 6.1.2013
The shortwave station "TL BBC" with it's frequency range of 4,6 - 15 MHz has been developed by Brown Boveri as a successor of the legendary "TL"-Station of Telefunken Albis. The wireless station has a similar design like it's "older brother" from Telefunken, it consists of the transceiver (the "Apparatekasten"), a battery case with the accumulator batteries and a pedal driven electric generator; only in later years, a mains power supply was available.
In 1939, Brown Boveri began to develop a contemporary portable shortwave
station to replace the Telefunken Zurich "TL", which had already been in service
for many years and of which the circuitry had been developed in 1932.
The SE-212 consists of the "apparatus case" containing the transceiver itself, a battery case with accumulators and a vibrator to generate the plate voltage and a pedal driven generator; the weight of the complete station with the transport crates is 137 kg. The standard antenna was a 8 m groundplane.
The transmitter output power can be increased from 0,35 to 15 Watts in three steps, with a simple antenna tuning mechanism, you can adjust for maximum antenna currrent. The set's meter can be set to indicate heaters and plate voltage, as found in other equipment of the same time period.
The receiver is a superhet with an intermediate frequency of 1600 kHz,
the valves EF50 and 6 KF4 are used. In the transmitter two valves KF4 (in low power stages)
and EL2 (in the output stage) are used. The El2 output pentode is
quickly used when the station is operated with full output power.
© 6.1.2013 Martin Bösch