Fullerphone Mk IV (Canadian)
|Fullerphone Mk IV (Canadian)|
Fullerphone Mk IV* (Canadian)
|Weight||14 lb (6.4 kg)|
|Length||12 in (30 cm)|
|Width||7 in (18 cm)|
|Height||6 7⁄8 in (17.4625 cm)|
Between 1941 and 1943 Canada produced 14,000 Mk IV and Mk IV* Fullerphones. The Morse key fitted in the earlier production instruments had a Canadian Key W.T. 8 Amp No. C2 while later produced Canadian Fullerphones were fitted with a Canadian Key W.T. 8 Amp No. C3 which was a simplified version with two U-shaped bridges of pressed steel construction.
Normal operating range was 15 to 20 miles however, as a direct current instrument where operation could be achieved with as little as 0.5 microampere flowing, range was only limited by resistance in the line and stray earth currents.
- Wireless for the Warrior - British World War 2 Fullerphones.
- Signal Training Volume III, Pamphlet No. 21, Fullerphones, Mark IV. 1939.