TRANSMITTERS & TRANSCEIVERS

Type SPA Transmitter

DATE OF DESIGN

FREQUENCY RANGE

POWER SUPPLIES

100 V or 250 V 48 to 61.5 Hz AC

RANGE IN MILES.

TYPE OF SET (VALVES USED)

WAVEFORM

ASSOCIATED WAVEMETER.

METHOD OF PRODUCING OSCILLATIONS

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.