Links to some other
e12 Data for German radio comm. receivers
24a. Technical notes for E52b receiver
e43 More technical details for Mw.E.c
Technical articles under preparation (received from PA0SE Dick Rollema):
10a Introduction to German World War II Radio Equipment
12a. German World War II Radio Equipment - Köln E52 receiver - part 1 (PA0SE Dick Rolema)
12b. German World War II Radio Equipment - Köln E52 receiver - part 2 (PA0SE Dick Rolema)
12c. Lorenz Shortwave Receiver Lo6K39a (Lo6L39), The ultimate TRF set [PA0SE]
12d. Telefunken World War II Superheterodyne Receiver Kw.E.a (Lw.E.a) [PA0SE]
12e. Telefunken World War II Universal TRF receiver Torn.E.b [PA0SE]
RX seen from above
RX seen from below
Mw.E.c (43) Medium wave communication receiver (0,83-3MHz).
It is a somewhat simplified version of the first version, you easily see that coil and tuning capacitor sections are missed or just empty holes.
Ranges: 830-1600, 1600-3000kHz
Circuit: 9x RV12P2000
1. RF amplifier, 2. Mixer, 3. LO, 4. IF, 5. IF, 6. Signal and AGC detectors + audio amplifier,
7-8. push-pull output stage, 9. BFO
An earlier version has two RF amplifiers.
IF: 352kHz, BFO: 353kHz.
DC power requirement: +12V 1.2A, +150V 30mA
Dynamotor for 12V operation: EU.a, EU.a1, EU.a2, EU.a3, EU.a4
Height 200mm, Width 313mm, Depth 180mm. Weight 13kg.
363kHz xtals used in the receiver, they looks like a low-profile EF11,
they were bought from German surplus dealer "auf dem Schrottmarkt" at
Weinheim UKW Tagung for a reasonable price two years ago
dl9lx - not ready
Radcom Nov80 pp1157. TT Constant-k crystal filters in Mw.E.c and E52
CQ-DL Mar. 85 pp138-140 was an article about MwEc xtal filter by DL9LX Ulrich Fleischmann
Radcom Jun85, TT: TTS pp34-35: Constant-k crystal filters (Mw.E.c + Köln E52) PA0SE
Hans-Joachim Ellissen: Die deutschen Funknachrichtenanlagen bis 1945,
Band 3: "Funk- und Bordsprechanlagen in Panzerfahrzeugen"
ISBN 3-928388-01-0 (printed 1991), see pg 121-125.
Technique of Radio Design, 2nd impression, 1943.
written around 1940 by E. E. Zepler
Lecturer at Cavendish Laboratory, Cambridge, and in the University College, Southampton; Technical Consultant;
Sometime Head of Receiver Development Department at Telefunken G.m.b.H.,
Research Engineer at Marconi's Wireless Telegraph Co, Ltd.
|(2nd impression 1943 - Chapman & Hall
Ltd, London WC2),
Ph.D. in the book The Technique of Radio Design
The book contains the following chapters:
1) Some fundamental theoretical facts 1-30
2) Transfer Energy from the aerial 31-49
3) The amplifier stage pp50-97
4) Problems of detection and frequency changing pp98-129
5) Selectivity pp130-152
...[E52 and MwEc type IF xtal filters,
...T9K39 front-end selectivity]
6) Receiver Noise pp153-164
7) Gain control pp165-182
8) The priciples of screening pp183-205
9) Undesired feedback pp206-240.
10) Hum, spurious beats pp241-252.
11) Distortion pp253-263
12) Parasitic resonances pp264-268
13) Power supply pp269-278
14) Routine measurements pp279-295
15) Fault finding
I mentioned the reference to Zepler's book for Pat Hawker, but replied that he had already drawn attention to this book in Technical topics.
I don't have the book or copy for the relative long chapter 5 (pp130-153), it is referred to by Stein Torp, LA7MI
Stikkord: Tankmottaker Mw.E.c, Tank receiver, tank empfänger mwec
last update: 2004.04.05