[Dept. of Computer Science]

Siemens E566 Debeg

Our Department and University.
See my other radios too! (Here is the next one.)

The tubed communication receivers of the fifties and sixties were so heavy that somebody invented the term boatanchor for this type of receiver, and this is an example. The Siemens E566 Debeg, known as the `Siemens Regenboog' (Rain bow) receiver in Ham circles, is among Siemens top models of the early sixties.

It was made for maritime use, as can be seen from a logo under the dial and the presence of the 14-21 kc band (submarine band); I think there aren't any submarines under my town, because I have never heard any. Besides the submarine band, it covers 85 to 30.000 kHz completely in 11 bands, both AM and SSB. It offers the 27Mc (Citizen's band), the various Ham bands (80, 40, 20 meters), the Shortwave broadcast bands, as well as bands for maritime and aviational use.

(1) 14-21 kc; (2) 85-175 kc; (3) 170-350 kc;
(4) 340-730 kc; (5) 720-1540 kc; (6) 1,5-3,2 Mc;
(7) 3,1-6,4 Mc; (8) 6,0-10,3 Mc; (9) 9,7-15,3 Mc;
(10) 14,7-20,3 Mc; (11) 19,7-25,3 Mc; (12) 24,7-30,3 Mc.
Steel, size WxHxD = 52x33x35cm. Weight: 34 kg.
Seventeen tubes, 5 pilot lights, various protection light bulbs.
RF chassis: 1. EF93 (RF-stage); 2. EF93 (reference oscillator);
3. EK90 (first mixer); 4. ECC82 (first local oscillator).
Frequency changer chassis: 5. EK90 (freq. doubler band 1 and 2);
6. EK90 (second mixer); 7. ECC82 (second local oscillator).
Audio chassis: 8. EF93 (IF stage wide); 9. EF93 (IF stage narrow);
10. EB91 (detector wide); 11-1. ECC82 (BFO and detector);
12-1. ECC82 (AF stage); 12-2. EB91 (noise limiter); 13. EL90 (output tube).
Various: 11-2. EM34 (tuning eye);
14. OA2 (voltage stabilizer); 15. OB2 (current stabilizer).
Pushbuttons 1-12 for bands, tuning, Reference osc. and Frekwenzlupe,
RF and AG gain, Noise limiter, switch BFO/narrow/wide, BFO control.
AC (110/125/220/250V) 110W.
A DC to AC converter can be connected and is switched with the main power switch.
Teletype, Send/Receive switch (disconnects antenna),
Antennas, Loudspeaker, Headphone.
Germany, early sixties.
The receiver has very good sensitivity and good selectivity (for AM and SSB, not for CW) as well. The frequency readout is accurate within 1kHz, which is quite an achievement at that time, and this accuracy is obtained using the `Frequenzlupe' mechanism. On the higher bands (6 and up) the receiver is double conversion, with the first Intermediate Frequency tuneable between 1080 and 1180 kHz (and second IF 100kHz). Changing the IF from 1080 tot 1180 kHz gradually adds 100kHz to the frequency tuned into by the main tuning dial, and the offset can be read on the small scale in the center of the dial. Using the reference oscillator, the main dial can be set exactly to a multiple of 100kHz. It is a bit more cumbersome than tuning a modern digital receiver with LCD readout, but it was the best 1960 could offer.

Gerard Tel, gerard@cs.uu.nl.