DFM2  Direction Finder Set 
Type:  A new design for DF sets. These include:

1. The use of a small frame aerial.
2. A great increase in the working range.
3. Economy in valve current consumption.

Frequency Range:  450 to 1,100 meters (assumed to the sane as the DFM)3
Valve lineup: 2 x S625;  2x DEH612
Comment:  The frame aerial used with the DFM2 consists of two windings  mounted at right angles to each other on a central stand
 

DFM2 Direction Finding Set. The receiver is contained in a brass case mounted on top of  a teak box. (Courtesy Wireless Telegraphists)
/dfm2_02.jpg
DMF2 with front panel removed. This example is held by the Science Museum in London. (Science Museum photo) 
/Fg6_aerial.jpg
The Fg6 aperiodic shielded frame aerial can be used with the 11G, DMF2 and DMF3 direction finding sets. (Courtesy Wireless Telegraphists)

Contributors and Credits:

1)  Lewis Bodkin  <05bodkin555(at)gmail.com>2)
2) The Handbook of Technical Instruction For Wireless Telegraphists", Fourth edition. 1929
 

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Apr 14/20