Transmitters & Transceivers

©RN Communications Branch Museum/Library

Type 681/7AS

	DATE OF DESIGN		N/K or N/A
	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.		N/K or N/A
	TYPE OF SET (VALVES USED)		N/K or N/A
	WAVEFORM		N/K or N/A
	ASSOCIATED WAVEMETER.		N/K or N/A
	METHOD OF PRODUCING OSCILLATIONS		N/K or N/A
	WHERE USED/FITTED		Fleet Air Arm use and thus available for fitting ashore in RNAS' or in Aircraft Carriers/
	FURTHER READING		N/K or N/A
	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.