Click for homepage
Germany
France
Cold War
Telefunken
  
ESK-52 →
  
B2M
German spy radio set (B2 clone) - this page is a stub

B2M, codenamed MITCHELL, is a spy radio set, developed in 1946 by Telefunken in Hannover (Germany), for use by intelligence services and Stay-Behind Organisations (SBO) in post-war Europe. It is a direct clone of the British Type 3 Mark II (B2), albeit built with German parts. The device was succeeded in 1952 by the similar ESK-52, which was nicknamed Amateur Radio Set.

The device is housed in a heavy wooden enclo­sure that also acts as a transport case. It has a leather grip at the top and a removable lid at the front, that is held in place by two hinges at the bottom and two spring-loaded clips at the top.

The B2M is a clone of the British Type 3 Mark II, commonly known as the B2, but unlike the B2 – which consists of three separate units – the B2M is an all-in-one device. At the front panel, the individual units – transmitter, receiver and PSU – are separated by white lines. On the inside how­ever, the three individual units are still visible.
  
B2M in wooden suitcase

Like the B2, the B2M comes with a set of plug-in coils for the various frequency ranges. The desired coil must be installed in the socket marked 'X' at the front panel. Unused coils are stowed on a wooden frame that is kept in the accessory compartment at the right. Other items that are provided in the accessory compartment are a screwdriver, morse keys, headphones, spare valves and a spare vibrator pack and power cables. The B2M was succeeded in 1952 by the ESK-52.

PLEASE HELP — This page currently acts as a placeholder for information about the German B2M spy radio set. Crypto Museum does not have a B2M in its collection. You can help us to improve this page by providing additional information.  Contact us
Wooden transport case
B2M in wooden suitcase
B2M with open accessory compartment
Front panel
Bare transceiver
Plug-in coils on wooden frame
Plug-in coils
Spare valves and vibrator pack
Headphones
Morse keys
Power cables
Screwdriver
Interior
Circuit diagram
A
×
A
1 / 15
Wooden transport case
A
2 / 15
2 / 15
A
3 / 15
B2M in wooden suitcase
A
4 / 15
B2M with open accessory compartment
A
5 / 15
Front panel
A
6 / 15
Bare transceiver
A
7 / 15
Plug-in coils on wooden frame
A
8 / 15
Plug-in coils
A
9 / 15
Spare valves and vibrator pack
A
10 / 15
Headphones
A
11 / 15
Morse keys
A
12 / 15
Power cables
A
13 / 15
Screwdriver
A
14 / 15
Interior
A
15 / 15
Circuit diagram

Audio samples
In February 2018, German radio amateur Karsten Hansky (DR3HRT), recorded the audio samples below. The first sample was taken from the receiver of the B2M, whilst connected to a long-wire antenna. The second sample is from the B2M's own transmitter, recorded approx. 400 km away via the Web-SDR receiver at Twente University in the Netherlands.

Specifications
  • Device
    Spy radio set
  • Purpose
    Mid- to long range agent communication
  • Manufacturer
    Telefunken, Hannover (Germany)
  • Model
    M2B
  • Successor
    ESK-52
  • Frequency
    3-16 MHz
  • Power
    Mains or battery
  • Mains
    90-140V and 190-250V AC
  • Battery
    6V DC
Transmitter
  • Operation
    Crystal
  • bands
    4 (plug-in coils) → see below
  • Output
    20 W
  • Antenna
    13-17 m wire
Receiver
  • Operation
    Free running
  • Bands
    3
  • BFO
    Yes
Plug-in coils
Coil Frequeny with A-size up Frequency with B-side up
L1 3 - 4 MHz 3.75 - 5.25 MHz
L2 4.5 - 6.25 MHz 5.5 - 7.5 MHz
L3 6.5 - 9 MHz 7 - 10 MHz
L4 9 - 13 MHz 12 - 16 MHz
Documentation
  1. B2M Operating instructions (French)
    Telefunken, undated. 2

  2. B2M circuit diagram
    Telefunken. undated. 1
  1. Document kindly provided by Daniel Guyez [1].
  2. Document kindly provided by Reinhard Glogowski [2].

References
  1. Daniel Guyez, B2M images and circuit diagrams
    Personal correspondence, 18 March 2019.

  2. Reinhard Glogowski, B2M operating instructions
    Personal correspondence, 12 April 2023.

  3. Karsten Hansky (DR3HRT), B2M audio samples
    Germany, 18-22 February 2018.
Further information
Any links shown in red are currently unavailable. If you like the information on this website, why not make a donation?
Crypto Museum. Created: Monday 12 February 2018. Last changed: Friday, 14 April 2023 - 08:29 CET.
Click for homepage