VHF Station SE-411
Autophon AG, Solothurn

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überarbeitet am 11.9.2010

In addition to the U.S. VHF stations SCR-608 bought from war surplus, there was an strong demand of a VHF vehicular station.
Autophon got an order to develop a modular medium power VHF wireless station, after they had successfully presented a few prototypes.

The new station SE-407/411 came in service in 1957, until 1963, around 1300 sets have been acquired. It was not before the end of the seventies, when the system has been replaced by the SE-412 transceiver, based on the American AN/VRC-12.

The wireless set can be tuned to twelve frequency channels, mechanically stored and pre-tuned, in the 24,1 - 35 MHz range. The set consists of a transceiver TR-96, a separate auxiliary receiver ZE-96 (intended to be used to catch the orders from the superior command) and a power supply.

Transceiver TR-96,

12 mechanically programmed channels, 24,1 - 35 MHz range

FM / F3

pout FM 20W

Reglement Funkstation SE-407 / SE-411

Auxiliary receiver ZE-96

12 mechanically programmed channels, 24,1 - 55 MHz range

Powered by 12 V 24 V DC vehicle battery
used with vehicular whip antennas.

The variant SE-411 with it's 24,1 - 35 MHz frequency range with 110 channels has been in use with the artillery and anti-aircraft troops. It's components are the Transceiver / Sendeempfänger TR 96, Auxiliary Receiver / Zusatzempfänger ZE 96 and the same power supply / Speisegerät SG 83.
The SE-411 communications equipment has been installed on the command vehicle Mowag.

Sendeempfänger TR83 Speisegerät SG83 Zusatzempfänger ZE83
Niederfrequenzverstärker NV83   Bordverstärker BV83

Tha transceiver TR 96 is mounted at the left in the mounting frame, it's dimensions are 302 x 260 x 340 mm and it's weight 23,2 kg. In the transmitter section of the modular construction, the signal of the common oscillator operating in the 24,1 - 35 MHz range is fed through an amplifier and exciter stage to the two final valves in a push-pull arrrangement, the antenna is fed through a variable coupler and antenna tuner.
For the modulation, a small inductance in the oscillator stage get's a variable connection to transmitter mass via a modulation diode, this arrangement does influence the oscillator frequency (frequency modulation).
The incoming signal is amplified and mixed with the receiver oscillator signal to generate a first intermediate frequency of 8 MHz. The signal is mixed to a second low intermediate frequency of 1,6 MHz and the signal is demodulated after having passed the limiter stage.

The power supply generates all necessary voltages for the transceiver and the auxiliary receiver and other modules from the 12 or 24 V DC vehicular power system. The correct voltage must be switched on the power supply, on the auxiliary receiver and with two switched on the mounting frame.

The auxiliary receiver ZE 96 is technically identical to the receiver section of the TR 96, the cabinet is a bit smaller with 212 x 260 x 340 mm and "only" 21,1 kg.
The auxiliary receiver permits to catch orders from a superior command on one frequency while communicating with other troops (e.g. other platoons) on another frequency. To use the auxiliary receiver as "standalone" set, You need the auxiliary control set / "Zusatzbediengerät"; so the value of a single auxiliary receiver sold as military surplus is reduced by far.

A core component of the whole transceiver is the so-called "Instantuner", where the oscillator signals for the channels with 100 kHz channel spacing are generated and in which twelve frequencies can be programmed mechanically.

The pre-programmed channels can be recalled from a control set installed at the tank commander's seat, You ca nalso select whether You want to hear the signal of the main or the auxiliary receiver or the on-board intercom on the headphones. From a remote control set, the station can be controlled over field telephone lines.
Bediengerät BG 83 Zusatzbediengerät ZBG 83

There is a big number of other acessories: an external speaker LS 83, thy typical Swiss Army microtel (like a telephone handset), a headgear with headphones and throat microphone to be used in noisy surroundings and various antenna equipment.

weitere Lektüre:
d: Die Funkertruppe, Rudolf J. Ritter, Bundesamt für Übermittlungstruppen
d: Kurzbeschreibung zur Kdo Funkstation SE-407 / SE-411, Autophon AG
d: Schriftenreihe: das Fernmeldematerial der Schweizer Armee, R. J. Ritter

© 15.11.2008 Martin Bösch