Inhaltsverzeichnis
SE-450 (F6 station)
Radio station SE-450 or F6 Station of the Swiss embassy radio service; al equipment is manufactured by different manufacturers, the transmitter is made by Siemens, the receiver a Collins 51-J4.
In the early 1970s, the Swiss embassy radio service changed from telegraphic to radio teleprinter operation, so new station equipment was needed for the so-called F6 Station. The centerpiece was the 1 kW commercial transmitter Siemens S654 used to transmit two radio telegraphy channels with a time offset, so-called F6 operation.
For the training of the signalmen in Switzerland, six stations were mounted in shelters on Berna trucks, these got the designation SE-450.
Technical Data
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- Receiver: E-629 (51J4) made by Collins: Double conversion, IF: 1st IF 1.5-2.5 or 2.5-3.5 MHz, 2nd IF 500 kHz
- Frequency range: 1.5 - 30 MHz (reception 0.5 - 30.5 MHz)
- Sensitivity: according to the data of the recipeiver used
- Output power: 1000 W eff.
Power Supply
Dimensions
The mobile radio station for training puposes came installed in a shelter on a Berna truck, the generator on a single-axle trailer.
- Station vehicle: Berna 4×4 Truck
- Generator: Saurer / BBC C485D, a water-cooled four-stroke diesel engine of 25 hp drives a 15 kVA three-phase generator.
Accessories
- A 2 x 15 m dipole is used as the standard antenna.
- A 3.6 m rod antenna was to be used for reception.
Station Equipment
The complete embassy radio training station SE-450 was installed onboard a Berna truck, it consists of a Siemens 1kW transmitter S-502 and two receivers, in the original configuration, two receivers E-629 (Collins 51J-4) were installed.
The transmitter S-502 is the 1 kW FSK transmitter S654 made by Siemens. Manual keying in A1 mode was provided for emergency communication.
The transmitter covers the complete range of 1.5 - 30 MHz in three bands: 1.5 - 4 / 4 - 11 / 11 - 30 MHz.
In the original configuration, two Collins 51J-4s were used, they had the military designation E-629.
In the truck, all devices could be controlled from control panel G3, with the automatic transmit/receive switching unit G3, the transmit - receive switchover was done automatically even for RTTY operation.
The teleprinter Siemens Stg-100 was used as terminal unit, in addition two punched tape transmitters 61d. A Siemens 30 RTTY adaptor, a channel synchronization unit 70 (K Syn), a punched tape comparator (STREIKO, Albiswerk), two synchronous units (GZG-1) and three teleprinters 15d made up the comlete teletype equipment.
The antenna switching unit G3 feeds the RF to the antenna system, the station has an automatic antenna tuning device, an artificial antenna Bird 8251 and a 2 × 15 m dipole as standard antenna.
Technical principle
Valve layout
Development
The centerpart of the station, the 1 kW - F6 transmitter S654 was developed by Siemens, as well as the teleprinters; in the original configuration from 1979, two receivers E-629 (Collins 51J-4) were used.
Field use
The F6 radio station was used as Embassy radio station, a total of 35 stations was acquired. Six stations were used at the Swiss embassy radio center in Murain (or Aegerten near Kernenried).
In the next generation of the embassy radio, the transmitter driver TD 90 from SRT was used together with the Siemens 1 kW as power amplifier, the CR91 also SRT as main receiver and the operation mode was changed to ARQ operation.
Six mobile stations with similar equipment were used as SE-450 for training purposes to train signalmen from Fk Kp 48 and operators for the stations in the Swiss embassies.
