Transmitters & Transceivers

©RN Communications Branch Museum/Library

Type SPA

	DATE OF DESIGN		N/K or N/A
	FREQUENCY RANGE		N/K or N/A
	POWER SUPPLIES		100 V or 250 V 48 to 61.5 Hz AC
	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		The outfit provides coded selective calling and responding facilities between a possible 1000 station addresses on a radio or line network. A station may also make a collective call to all other stations.
	FURTHER READING
	PHOTOS, SCHEMATICS, DOCUMENTS		Details of Type SPA
	NOTES.		N/K or N/A