====== SE-203 ======
** SE-203 Radiovox**; manufactured by [[Autophon|Autophon AG, Solothurn]].

In the early 1950s, [[Autophon]] developed a frequency-modulated radio system for the communication between the aircraft command vehicle (FLEIW), the aircraft guidance post (FLEIPO) and the central aircraft control. It was based on a very similar police vehicle station.

The set saw mobile use as **SE-203/m** in the Mowag aircraft command vehicle (FLEIW) or fixed use as **SE-203** in the mountain stations as VHF relays.

{{:images:se-204.jpg?600|SE-203 / 204}}
===== Specifications =====
  * [[Principle]]: [[Transceiver]], Receiver: [[Single Conversion]], [[IF]] 4.3 MHz
  * [[Modes]]: [[F3|FM (F3) resp. Phase modulation G3E]]
  * [[Frequency Range]]: 80 - 87.5 MHz (four crystal controlled channels)
  * [[Sensitivity]]: [[F3|FM (F3)]] / [[Selectivity]]:
  * [[Output Power]]: 25 W

==== Power Supply ====
  * [[Accumulator / batteries]]: 27 V accumulators, a converter is used to generate heaters and plate voltage.
  * [[Mains]]: The station can also be operated from a mains supply unit.

==== Dimensions ====
  * Transmitter and receiver each 390 x 215 x 218 mm, approx. 60 kg

==== Accessories ====
  * The dipole antenna A 78 D was used as the standard antenna in the mountain stations.
  * In mobile operation on the FLEIW, a vertical antenna A 78 Spez was used.

===== Operation =====
The station consists of one transmitter S 78 BU and two receivers E 78 BMU. For the mobile variant, the control unit K 78 M is used, the control unit K 78 F is used in fixed installations. The station could be remotely controlled via a cable with a length of up to 50 m.

===== Technical Principle =====

==== Valve Layout ====

==== Development ====
Around 1951/52, [[Autophon]] developed the VHF radio station Radiovox, which was also used by police stations and saw military use with the Air Force.

==== Fiels Use ====
{{ :images:se-203-einsatz.jpg?direct&400|SE-203}} The station was acquired by the Air Force in 1952 to be installed as **SE-203/m ** (12 units) in the Mowag aircraft command vehicle (FLEIW) or for fixed use as VHF relay station in the mountain stations: **SE-203** (6 units).


{{gallery>:images?se-203*.jpg&0&80x80&lightbox&showtitle&titlesort}}

===== Technical Documentation =====

==== Additional Informations ====
  * [[https://www.hamfu.ch/de/geraete/geraet.php?id=232|SE-203 (Radiovox) on Hamfu Website]]