TRANSMITTERS & TRANSCEIVERS

Type 640 Transmitter

DATE OF DESIGN

FREQUENCY RANGE

MF 240 kHz to 3 MHz.
HF 1.5 to 24 MHz.

POWER SUPPLIES

400 - 450 V 50 - 60 Hz 3 phase 3 wire 4kW (on full power)
115 or 230 V AC or DC, 150 W for anti-condensation heaters.

RANGE IN MILES.

TYPE OF SET (VALVES USED)

WAVEFORM

Single, Independent or Double Sideband modulation in the following modes:
CW or MCW Telegraphy - Single Channel
D.S.B. telephony - Single Channel
I.S.B. telephoney or keyed tone (suppressed or pilot carrier)(External modulation (FST) - Two Channels.

ASSOCIATED WAVEMETER.

METHOD OF PRODUCING OSCILLATIONS

WHERE USED/FITTED

MF and HF transmitter for voice and telegrphic communication.

FURTHER READING

PHOTOS, SCHEMATICS, DOCUMENTS

Details of Transmitter Type 640.

NOTES.

BR 2328.