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 "TL BBC" had been introduced in 1941/42, a number of 73 or 74 stations (Ritter : 126 ex.) had been delivered until 1945.
In the first years, the station had been used for ground - air communications, after 1946 it has been handed over to Anti Aircraft units to be used for command communications, where it was less successfull due to the higher frequency range. The TL BBC / SE-212 has been withdrawn in 1951 and was kept in war reserve.

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 transceiver can be continuously tuned from 4,6 - 15 MHz in two ranges, the accuracy of the analog dial is around 10 kHz. Both dials are printed on a white surface in a spiral arrangement; when bandswitching, the dial pointer is moved. The "Empfänger - Nachstellung" (Receiver fine tuning) lets you adjust the receiver frequency when netting with another station.
The set has a combined main and mode switch: when turned left, you operate in CW telegraphy and the volume is increased when turning the control further left, when turned to the right, you operate in AM mode and the volume is increaed when you turn the control further right.

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.
I don't have further informations, the Reglement and schematics are lacking, and I'm stil looking for a battery case and a matching pedal generator.