überarbeitet am 10.9.2010
In the late sixties, the Swiss Army acquired two VHF transceivers from developed for the U.S. Army Signal Corps: Tha manpack set SE-227 and the SE-412, a VHF medium power station designed for mobile use onboard vehicles. In the U.S., this set was quite common and carried the designation VRC-12.
The transceiver covers the military VHF frequency range divided in two bands: the A Band 30 - 52,95 and B Band 53 - 75,95 MHz wil make 920 channels with 50 kHz channel spacing, the transmitter output power is switchable, in position POWER LOW it is 1 - 3 W which will give an operation range of ca. 5 km, in position POWER HIGH the operation range is extended to 20 - 30 km when the longer ship antenna is in use.
On the front panel, You find in the left upper corner the indiactor lamp CALL
indicating a transmission opening up the squelch circuit. Next to it, You find the
band selector for A and B band, just below the frequency selector knobs for the
MHz and kHz digits, the active frequency is displayed in a small window.
The Auxiliary receiver consists mainly of the receiver section of the transceiver with all necessary controls for the receiver. It is used to receive communication from the superior command while You are communication with other groups or platoons in same unit on another frequency channel on the main receiver.
In command vehicles, the SE-412 came in the SE-412ABC configuration: One transceiver (A) is used to keep in contact with the superior authority, the second transceiver (C) is used to contact subsidiary troops and the auxiliary receiver (B) is used to monitor a third channel.
As an accessory, the on-board intercom AM-1780 has been used on Swiss tanks. To form a relay station of two SE-412, there is a relay switching box C-2299/URC.
© 28.5.2009 Martin Bösch