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Autophon AG, CH - Solothurn

All Wave Receiver E52

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überarbeitet am 17.10.2010

Single conversion, ZF 75 (below 2 MHz) resp. 1600 kHz (above 2 MHz)

Analog dial

AM, SSB (BFO)

100 kHz - 37.5 MHz

Sensitivity

Selectivity -6 dB
3 / 7.6 kHz

Attenuator, AGC, Crystal Filter

As a successor to the E-39 receiver, which still used a technology with plug-in coil sets and a calibrated logging scale, Autophone started developing the E-44 with a turret tuner with directly switchable wavebands and a calibrated dial which allowed the frequency to be read directly from the dial.

Only a small fraction of these receivers has produced with a modified arrangement to use the common E...-valves. It's estimated that around 30 sets have been sold to Swiss PTT (Postal Telephone Telegraph Services) and Agence France Press, the success as a commercial shortwave receiver on the international market has been very small.

This receiver is a 19 inch rack construction, the mains socket and antenna connectors have been moved to the back of the receiver.

The front panel is divided in two sections by the horizontal linear dial of the turret tuning arrangement.
Above the dial, You find from the left hand the clock and the signal strength meter switchable to control the heaters and plate / B+ voltages. At the right upper corner, You find the mains voltage selector, the mains switch and some fuses.
Underneath the frequency dial, You find the rotary band switch operating the turret tuner - find the corresponding dial in the dial window - and at the right hand the main tuning knob with a mechanical blocking arrangement. Next to this one the crystal filter control, it's operated as 900 Hz audio filter in the bands below 2 MHz.
In a row of controls below, You find from the left the volume control ("Lautstärke" or "Puissance"), the noise limiter switch and headphone sockets, the AGC/RF gain control, the BFO control for CW reception, the selectivity switch activating the broad, narrow and the crystal filter to reject unwanted signals from adjacent channels.

The single conversion set with two HF- and another two AF- amplifier stages is working with an intermediate frequency of 75 kHz in the ranges below 2 MHz and with an intermediate frequency of 1,6 MHz on the higher frequency bands.

further reading:
d: das Fernmeldematerial der Schweizer Armee, 7. Folge, R. J. Ritter
d: www.radiomuseum.org

© Martin Bösch 26.8.2007