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SE-401: Motorized Wireless Station 44

Motorized Wireless Station 44, M44 resp. SE-401; developed and produced Zellweger, Uster.

The Zellweger Company, based in Uster, did develop the Funkstation Kurz Lang 43 (Short Long Station 43) based on the components of the FL40 (Mobile Light Station 40) in the years 1943/44 to replace the Telefunken Short- / Longwave Station Kurz - Lang - Station / D-Station, of which because of the World War II, Telefunken was not able to provide a sufficient number.

Now, the call for a motorized radio station was heard at Zellweger. In fact, the FL40 was mobile, but a separate vehicle was needed to tow the trailer. So Zellweger developed the Motorized Radio Station M44.
The components of a standard FL40 were installed in similar steel tube frames and with similar auxiliary equipment like in the KL43 in a light truck; In contrast to the KL43, the station was equipped with a crank mast at the rear of the truck, like the one found on the FL40.

SE-401 / M44 in Berna truck

Technical Specifications

Power Supply

  • Generator: Three-phase generator Uster (50V, 150 Hz) to be driven from a gasoline or electric motor; while driving, the station is operated by the built-in generator in the truck.

Dimensions

  • The van CR1D with the station material has a total weight of 5070 kg
  • The transmitter in it's tubular steel frame has a weight of 75 kg
  • The receiver in it's steel tube frame has a weight of 75 kg

Accessories

  • While on the move, a roof antenna is used.
  • For fixed operation, a 14 m telescopic mast (same as with the FL40, mounted to the truck) is used
  • Alternatively, a longwire antenna can be erected, for operation on longwaves 50 m in length, mounted between two 10 m masts.

* The motorized radio station 44 is equipped for remote operation. On the receiver side, a remote control unit with a tone generator is installed in the receiver frame. On the transmitter side, a similar device, the TTG („Tontastgerät“) is connected in the telephone line between the transmitter and the remote control post. The modes telephony, telegraphy (with a 900 Hz filter) and a service phone connection between remote post and the receiver / transmitter site can be selected.

Station Material

The Motorized radio station 44, abbreviated M44, is a wireless station built into a Berna truck. It consists of the transmitter and receiver components of the FL40. Thanks to the power supply from a built-in car generator and the roof antenna, the station can be operated while driving.

The station is quite similar to the Short-long station 43 / "G-station" of the Air Force; in contrast to the KL, the standard components of the normal FL40 with their frequency range were used.

The transmitter is the reliable FL40 transmitter, similar to the KL43 / G-Station, the transmitter is installed in a steel tube frame.

The frequency ranges 190-240 / 240-400 / 400-715 kHz in the longwave range as well as 1.5-2.3 / 2.3-3.3 and 3.3-4.5 kHz in the shortwave range are covered. By means of a quartz crystal, the transmitter can be calibrated on the frequency of 4000 kHz.

The transmitter has three stages, a EBL21 in the oscillator / exciter stage, two EBL21 in frequency doubler stage and two OS41/1250 in the power amplifier stage. Operation modes are A1 (CW), A2 (modulated telegraphy) and A3 (telephony); the modulator stage (EBL21) acts on the grids of the power amplifier stage. The output power is switchable, in position „Einpfeifen“ („tune“) / „Low“ it is 5 - 7 Watt, in position „Medium“ 20 - 30 W and in position „High“ 80 - 120 W.

The plate voltage of 330 V in the exciter / modulator stages and 1200 V in in the power amplifier stage is generated from the three phase 50V / 150 Hz voltage via a transformer and four PV 200/600 rectifier valves.

Receiver is the proven Uster / E41 All wave receiver, but only the 200 kHz - 24 MHz ranges are covered with seven coil inserts. A station clock is mounted to the right of the frequency coil.

The truck Berna CR1D is equipped with a 65 hp four-cylinder diesel engine and with the built-in wireless station, it has a weight of 5070 kg. The vehicle is equipped with a three-piece L - roof antenna to operate thestation on the move. For shortwaves, a 14 m crank mast Magirus, similar to the one found in the FL40 is used, and for fixed operation for shortwave a 8 m and for longwaves 50 m long wire antenna between two 10 m masts is used.

As with the FL40, the power is supplied via a gasoline or mains motor-fed converter group, which provides the 50 V / 150 Hz three-phase current. During driving, the converter is fed by the car generator.

Technical Principle

description above

Valve layout

description above

Development

Entwicklung

Von der Funkstation M44 wurden 1943/44 vier Stationen entwickelt und zu einem Stückpreis von 105'000.- Fr. der Truppe „zu Versuchszwecken“ übergeben, sie wäre Ende des Zweiten Weltkriegs zur Beschaffung in grösserer Anzahl bereit gewesen.

Einsatz

Als Einzelstationen waren die vier Stationen M44 der Leichten Kompanie der Funkerabteilung 6 bis zur Einführung der Truppenordnung 61 zugeteilt, sie wurden 1963 durch SE-222 ersetzt und 1967 liquidiert.

Development

Four stations of the wireless station M44 were constrcted in 1943/44, and these were handed over to the troops „for experimental purposes“ at a price of 105'000.- Fr. Everything has been prepared to produce this station in larger numbers at the end of the Second World War.

Mission

The four stations M44 were assigned to Signal Division 6 as individual stations. When troop order 61 was introduced, they were replaced by SE-222 in 1963 and were liquidated in 1967.

Technical Documentation

Additional Information

en/se-401.txt · Zuletzt geändert: 2019/12/11 19:38 von 127.0.0.1