Transmitters & Transceivers

©RN Communications Branch Museum/Library

Type 691

	DATE OF DESIGN		N/K or N/A
	FREQUENCY RANGE		277 to 283 MHz - 10 switched crystal controlled frequencies.
	POWER SUPPLIES		75A - 115 or 230 Volt 50 to 60 Hz single phase at 300 W. Type 691EF - AC Supply Outfit DWH Tx & Rx - requires 24 V DC at 720 W obtained from Power Unit DC.
	RANGE IN MILES.		N/K or N/A
	TYPE OF SET (VALVES USED)		N/K or N/A
	WAVEFORM		FM or AM Voice and MCW.
	ASSOCIATED WAVEMETER.		N/K or N/A
	METHOD OF PRODUCING OSCILLATIONS		N/K or N/A
	WHERE USED/FITTED		A low power (10 watts) UHF transmitter/receiver used for ship/ship and ship/shore communication. Supersedes Type TBS and Type 682.
	FURTHER READING		N/K or N/A
	PHOTOS, SCHEMATICS, DOCUMENTS		Photographs. Details of Type 691.
	NOTES.		BR 2062 (1)(2)