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 +====== SE-450 (F6 station) ======
 +**Radio station SE-450** or **F6 Station** of the Swiss [[embassy radio|embassy radio service]]; al equipment is manufactured by different manufacturers, the transmitter is made by [[Siemens]], the receiver a [[Collins]] [[E-629|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 [[S-502|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 =====
 +{{ :images:se-450-sender-s654-funkwagen-berna.jpg?direct&300|SE-450: transmitter Siemens}}
 +  * [[Principle]]: radio station consisting of separate [[transmitter]] and [[receiver]]
 +     * [[Receiver]]: [[E-629|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
 +     * [[Transmitter]]: [[S-502]], [[Siemens]] **S 40 135 - S654**
 +  * [[Modes]]: [[A1]], [[A3J|SSB (A3J]], [[F1]] (FSK telegraphy), [[F1|F6]] (four-frequency diplex telegraphy)
 +  * [[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 ====
 +  * [[Mains]]: three-phase mains 3 x 380/220 V
 +  * [[Generator]]: diesel generator 15 kVA, 3 x 380/220 V on single axle trailer
 +
 +==== 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 4x4 Truck
 +  * Generator: Saurer / BBC C485D, a water-cooled four-stroke diesel engine of 25 hp drives a 15 kVA three-phase generator.
 +{{ :images:se-450-funkwagen-berna.jpg?direct&300|SE-450: truck Berna}}
 +==== 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.
 +  * The teleprinter used in the original embassy radio station was the well known Siemens [[Stg-100]], it was replaced in 1985 by the electronic teleprinter [[PACT-220]].
 +
 +===== 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]].
 +
 +{{ :images:e-629-collins-51j4.jpg?direct&250|E-629: Collins 51J-4}} 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 ====
 +  * [[Receiver]]: c.f. data of the [[E-629]] receiver
 +
 +==== Development ====
 +{{ :images:se-450-sender-s654.jpg?direct&250|SE-450: Siemens transmitter 1 kW}} The centerpart of the station, the 1 kW - F6 transmitter [[S-502|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.
 +
 +{{gallery>:images?se-450-*.jpg&0&80x80&lightbox&showtitle&titlesort}}
 +
 +===== Technische Unterlagen =====
 +  * {{:manuals:se-450_-_die_funkstation_se-450_prov.pdf|Die Funkstation SE-450, prov. 1979}}
 +==== Weitere Informationen ====
en/se-450.txt · Zuletzt geändert: 2020/01/01 17:39 von 127.0.0.1