TYPE 12 P


TYPE 12 TRANSMITTER

DATE OF DESIGN 1917
FREQUENCY RANGE 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.
POWER SUPPLY Rotary. 0.5kW. Revs 2250. 80V AC 150 c/s. Slightly enhanced supply for Type 13.
TYPE OF SET SPARK
WAVEFORM -
METHOD OF PRODUCING OSCILLATIONS n/a
WHERE USED/FITTED 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 300 c/s.
ASSOCIATED WAVEMETER Standard Service Wavemeter designed by HMS Vernon.
SMALL SCHEMATICS

Read these three pdf files 12 General.pdf - 12 fitting up.pdf - 12 rx.pdf



PHOTORAPHS