TRANSMITTERS & TRANSCEIVERS

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 SUPPLIES

Rotary. 0.5kW. Revs 2250. 80V AC 150 c/s. Slightly enhanced supply for Type 13.

RANGE IN MILES

TYPE OF SET

SPARK

WAVEFORM

METHOD OF PRODUCING OSCILLATIONS

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.

FURTHER READING

Type 12 W/T Installation

Fitting up

Typical Arrangements of Office and postions of Receiving Instruments

See Type 13

IMAGES, PHOTOS, DOCUMENTS, SCHEMATICS ETC.

Photographs, Schematics, Documents

NOTES.