LA6NCA - WW2 GERMAN RADIO PAGE

E52b - Page 1

Page 2, Page 3

 


Here is my E52b collection.
This is a very interesting radio.
This is advanced mechanical technology.
I work as a broadcast equipment designer,
and I have learned much by study E52b to get ideas in my products.
1 ... E52b-1, Shack


Original paint.
2 ... E52b-5, Serial nr. 1466, from Trondheim, Black frequency microfilm.



This receiver is 100% OK and trimmed. Original paint. Variable BFO reinstalled.
3 ... E52b-1, Serial nr. 1273, from Trondheim,


Variable BFO removed.
4 ... E52b-1, Serial nr. 2242, from LA8AK


This receiver is 100% OK and trimmed. Variable BFO removed.
5 ... E52b-1, Serial nr. 734, Black frequency microfilm.


This receiver is 100% OK and trimmed. New paint, late war production without variable BFO
6 ... E52b-7, Restaurert


Variable BFO reinstalled.

 

Kln E52bb is the best short-wave receiver produced under WW2.
The performance can be compared with the R390.
R390 is a famous US receiver from the 50’s, 60's and 70's.
E52 is a super heterodyne receiver with an IF frequency on 1 MHz.
The MF filter is extremely good with a variable bandwidth from 200 Hz to 10 KHz and with a flat pass band.
Mirror frequency is < 1: 50000.



LA8AK's drawing

This is a block diagram over Kln.
The HF amplifier have 5-gang tuned circuits.
The oscillator capacitor tuning capacitor is synchronised with the HF amplifier capacitors
in a 6-gang capacitor. This heavy filtering gives a very good rejection of unwanted signals.
Both mirror frequency and large signals on frequencies near the operating frequency.
The MF section is very advanced. It has 6 tuned circuits before the first amplifier.
Then the signal pas a XTAL filter, amplifier and a second XTAL filter.
The pass band of the XTAL filter can be selected from 200 Hz to 10 kHz with the pass band regulator.
 


INSTRUCTIONS FOR KOELN E52 RF & MIXER/OSCILLATOR COIL UNIT REMOVAL

by GW6WRP -  Ron


E52b-1

Specifications for the E52 'Kln'

Frequency ranges





Modes

Power requirement

Dimensions

Weight

Sensitivity



Image rejection

IF rejection

IF frequency

BFO


Bandwidth

Frequency stability


1480-3020kHz
2980-6040kHz
5975-10050kHz
9950-17700kHz
17600-25200kHz

A1, A2, A3

110-230VAC 50-60Hz, or 12VDC

245mm x 446mm x 350mm

40,8kg

AM (wide) 3,5V
CW (wide) 1V
CW (narrow) 0,3V

Better than 94dB @20MHz

Better than 100dB

1000 kHz

XTAL - 1000,9kHz
or 995 kHz - 1005 kHz

continuously variable between 200 HZ - 10 kHz

better than 30 x 10 E-6 C




E52b-1

E52 LINKS:

http://www.cdvandt.org/e52_prototype_v1.htm

http://www.cdvandt.org/koeln_e_52.htm

http://www.agder.net/la8ak/24a.htm

http://www.agder.net/la8ak/12a.htm

http://www.agder.net/la8ak/12b.htm

http://www.radiomuseum.org/r/telefunken_koeln_e52_e_52_t8k44_t_8.html

http://www.radiomuseum.org/forum/telefunken_e52_e_52_t8k44_t_8_k_44_koeln2.html#

http://www.richardsradios.co.uk/g2awa.html



E52b page 2

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