TRANSMITTERS & TRANSCEIVERS

Type 639 Transmitter

DATE OF DESIGN

FREQUENCY RANGE

POWER SUPPLIES

Power is provided by a Mallory type battery divided into two networks to supply the lamp separately from the electronic units. Capacity 72 hours at 11 V - 13 V.

RANGE IN MILES.

TYPE OF SET (VALVES USED)

WAVEFORM

ASSOCIATED WAVEMETER.

METHOD OF PRODUCING OSCILLATIONS

WHERE USED/FITTED

Submarine Indicator Buoy. To provide HF and UHF transmission plus a flashing lamp indicating a submarine in distress at a recoverable depth.

FURTHER READING

PHOTOS, SCHEMATICS, DOCUMENTS

Details of Transmitter Type 639.

NOTES.

BR 4122.