TRANSMITTERS & TRANSCEIVERS

Type 681 - 7AS

DATE OF DESIGN

FREQUENCY RANGE

Frequency band of 30 to 131 Mc/s covered by plug-in coils.

POWER SUPPLIES

Any available AC supply between 200 and 250 Volts at 50 to 60 c/s.

RANGE IN MILES.

TYPE OF SET (VALVES USED)

WAVEFORM

ASSOCIATED WAVEMETER.

METHOD OF PRODUCING OSCILLATIONS

WHERE USED/FITTED

Fleet Air Arm use and thus available for fitting ashore in RNAS' or in Aircraft Carriers/

FURTHER READING

PHOTOS, SCHEMATICS, DOCUMENTS

Details of Transmitter Type 681.

NOTES.

The associated receiver was the P42 (also an RAF set) but to date, we have no information on this set. The associated receiver for the Type 75C which became the Type 87 (a VHF transmitter) was the CDU formerly an RAF receiver called a P104 which post dates the P42 by many series numbrs.