E10K

FUG10 Receiver

 






E10K is the short wave receiver in the FUG10 system. The FUG10 system was developed in 1936 – 1937,
and was from 1939 standard radio system in most of Luftwaffe’s bombers.





Four preset radiofrequencies can be programmed with the wheel under the dial.





Latest technology with the tube RV12P2000 was used in all functions in the receiver.
The receiver can be replaced in less then 30 seconds with the unique mounting system.





LA8AK’s block diagram.

E10K

HF receiver
Frequency range: 3.0 – 6.0 MHz
IF = 1460 kHz.
Power: 12V , 230V
Measures: H = 180 mm, W =  220 mm, D = 200 mm
Weight: kg






Here we can see the fine mechanical molding technology used in this radio.





Look at the advanced casting technique and cable guide. This is the German WW2 technology on top.





Left side. The BFO oscillator with RV12P2000 is located in the bottom of the photo.





Rear side. Here is the 10 pin connector with antenna, power and audio signals.





The audio amplifier is located in the lower section.





Upper side. Her is both RF an MF circuits.





Underside of the RF section. Here is the fantastic tuning capacitor.




AUDIO AND BFO SECTION.



Here is the lower section of EK10. On the right we have the audio amplifier. The BFO is to the left.

Here is the technical data for the audio amplifier:

THD
THD, even harmonics
THD, odd harmonics
THD+N
SINAD
Output impedance
Max level
0.17%
0.04 %
0.17 %
0.19 %
54 dB
--
--





Audio module with the headphone connector.





Back side of the audio amplifier.





Underside of the audio amplifier.

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Measurement of MF filter.
(A) is the signal input from measuring equipment.
(B) is the signal from the filter and back to measuring equipment.
My special measuring probe is in use here.
The signal is terminated in a 50 ohm resistors and connected to the input of MF filter with a capacitor of 1 pF.
With this equipment, we can measure a dynamic range of 100 dB.






Here is the curve to the MF filter.
X axis is 200 kHz. Y axis is 100 dB
The correct frequency is 1460 kHz and not 1500 kHz that I have calibrated to.
The radio works very well with this frequency, too.





Component List and high resolution shematic



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