1.8 Mc/s to 2.5 Mc/s. Two spot frequencies were allocated to each
set [Type 12 and 13] typically in the region of 1.5MHz and 500kHz.
Reception was achievable down to 70kHz.
Rotary. 0.5kW. Revs 2250. 80V AC 150 c/s. Slightly enhanced supply
for Type 13.
TYPE OF SET
METHOD OF PRODUCING OSCILLATIONS
The Type 12 is a low powered spark transmitter/receiver which was
fitted into Flotilla Leaders as the Auxiliary Set for short distance
communications when in company. It also has an emergency set which is
integral. By using a revolving spark gap, the output spark frequency is
Standard Service Wavemeter designed by HMS Vernon.