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Siemens 745 E303

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Desktop Shortwave receiver

As a descendant of WWII receivers like Lorenz "Schwabenland" or Telefunken H.E."Caesar" (coil turret, IF filters) this receiver became necessary when West Germany was reintegrated into the world market in the late forties. It was used by different government authorities and on ships. Some of these receivers were exported to Belgium and France. Competitors were Hagenuk UE 11, Lorenz E 5 and Telefunken E 127 Kw. The shape of the selectivity curve doesn’t fit today's needs.

The E 301 is the first version (1952). The E 303, E 305 and E 306 (1953) are about the same with different power supplies covering 1.5 MHz – 30.2 MHz in seven ranges. The eighth compartment of the coil turret is not in use normally. An additional frequency range of 230 – 530 kHz and a vibrator for 24/110 V DC were available as an option.
There is also a model E 307. The precise differences to the E 303 are unknown; the faceplate looks about the same. The E 307 however has different frequency ranges: 1.5 – 3.0 / 3.1 – 4.6 / 6.2 – 6.5 / 8.1 – 8.8 / 12.2 – 13.3 / 16.2 – 17.4 / 22.0 – 22.7
Note that the E 302 is a relabelled former E 66a (1948) for marine applications. It is electrically and mechanically quite different and has a long linear dial.

Specifications
Type
Desktop Marine HF Receiver 
Frequency range RX
1.5-30 MHz (230 – 530 kHz optional) 
TX
Frequency stability
Tuning steps
Filters
Receiver
Modulations
AM / CW 
Sensitivity
CW: 0.2 µV (6 dB S/N)
AM: 1.6 µV (10 dB S/N) 
Selectivity
Variable 0.3-5 kHz (–6 dB)
Formfactor -6/-60 dB: 1:4 at 5 kHz bandwidth 
Receiver system
Single conversion, 10 tubes 
IF-frequencies
1st: 1326 kHz 
Image rejection
> 60 dB 
Audio output
2 W/4000 ohms 
Transmitter
Modulations
RF-output
Connections
Antenna
Impedance
60Ω 
Electrical
Power requirements
Mains (110/125/220 V AC +/-10% 40-60 Hz, 65 W and 220V DC +/-10%, 85 W) 
Current drain RX
TX
Physical
Dimensions (w×h×d)
552 × 356 × 340 mm (21.73 × 14.02 × 13.39 in)  
Weight
44 kg (97.1 lbs)  
Form factor
Desktop 
Manufactured
Between 1952 and 1957 in West Germany 
Other features
Memories
Usage
Marine / Navy 
Manufacturer
Siemens 
Model
745 E303
Features
 
Manuals, Diagrams and Brochures
 
None available  
 
 
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