Type: Similar to type 11G DF set. This DFM3 set provides capability to DF continuous waves, a function which the 11G doesn't have.
Frequency Range: 450 to 1,100 meters
Valve lineup: 2 x S625 in the  HF stages; DEH 610 for the detector and  DEL610 for the note amplifier
Comment:
Also refer to the DFM3 section in ths Marconi Review document,

DFM3 schematic. Download to enlarge (Courtesy Wireless Telegraphists)

DFM3 schematic. Download to enlarge (Courtesy Wireless Telegraphists)

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
3) Marconi Review Pub. Vol 1; Oct 1928 to Dec 1929; Issue 5, Pg 9

Apr 13/20