Inhaltsverzeichnis
SE-301: Fahrbar Schwere Funkstation
Fahrbar Schwere Funkstation , F.S.; made by Telefunken.
The Fahrbart Schwere Funkstation F.S.25, which was developed by Telefunken, Berlin in 1923/24, was one of the earliest mobile wireless stations which could operate in telephony mode. Four stations were acquiered in 1925/28 and handed over to the Signals Kp 5 in 1937.
Technical Specifications
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- Transmitter: Telefunken Spez 219Bs; Frequency Range: 99 - 857 kHz
- Frequency Range: see above
Power Supply
- Generator: Siemens generator (100 V, 500 Hz, 20A and 50V, 12 A) powered by a petrol engine.
Dimensions
- Apparatus trailer 1100 kg, machine trailer 1300 kg and mast trailer 1400 kg
Accessories
- Antenna material: Usually the mobile heavy radio station F.S. / SE-301 operates on a 60 m T / L - antenna on two 12 m masts or an umbrella antenna.
Station Material
SE-301 Apparatus Trailer with the E25 / Spez 7Bs
Photograph published by R. Ritter
SE-301 Apparatus Trailer with the E31 / Spez 470Bs
Photograph published by R. Ritter
The station consists of three uniaxial trailers, an apparatus trailer with the transmitting and receiving equipment, a „machine“ trailer (with the generator) and a mast trailer.
The Telefunken transmitter Spez 219Bs is tunable from 350 - 3025 m (99 - 857 kHz). In the transmitter, the valves RS55, two RS19 and a rectifier RG64 are used.
The station has a maximal output power of 200 W in contiuous wave telegraphy (A1) and 70 watts in modulated telegraphy and telephony. The 500 Hz alternating current is used to generate the 1000 Hz audio frequency for modulated telegraphy after rectification.
As receiver, first a Telefunken Spez 7Bs (receiver E25) (two RE062t) with a two-stage audio amplifier Spez 60Bs was used; in 1933 it was replaced by the Telefunken long wave receiver Spez 470Bs / E31, the three tuned circuit TRF receiver has a frequency coverage of 100 - 1091 kHz in four ranges, it is equipped with six valves RE074n.
Technical Principle
Valve Layout
Development
The Fahrbar Schwere Funkstation F.S. was developed by Telefunken GmbH, Berlin in around 1923/4 and was delivered to the troupe in 1924/5, a total of four stations were acquired.
Usually, the station was moved as a trailer train of two or three carriages, after the apparatus trailer (1100 kg) follows the „machine“ trailer (with the generator, 1300 kg) and a mast trailer (1400 kg). The maneuvering characteristics of the prototype vehicles with theiur solid rubber tires reminiscent of cavalry times were at least „challenging“.
Field use
Initially, one signal company Kp 1 to 3 was assigned to each of the Army Field Corps, each company was equipped with one „Fahrbar Schwere Funkstation“; they served as a link between the general staff of the army field corps.
In 1937, the F.S. used for command communication was assigned to signal Kp 5. In „active service“ during the years of Second World War, the station was converted to portable use in transport crates, to which after 1951 the designation SE-216 was assigned .
The four stations saw their last use as SE-301 after 1951 with the Landsturm Fk Kp 57/58 until it's liquidation in 1956.
F.S. 25 on the move
Image found at the Website of O'Neills Electronic Museum
F.S. 25 in position near Biasca
Image found at the Website of O'Neills Electronic Museum
