TRANSMITTERS & TRANSCEIVERS

Type 638 Transmitter

DATE OF DESIGN

FREQUENCY RANGE

3 spot distress frequencies:
500 kHz
2182 kHz
8364 kHz

POWER SUPPLIES

Integral 3 phase AC hand generator, smoothed to 15 V DC. Provision for connecting a battery at the front panel.

RANGE IN MILES.

TYPE OF SET (VALVES USED)

WAVEFORM

MF/HF Voice and MCW on 500 kHz and 2182 kHz and variable between 8200 kHz and 8800 kHz.

ASSOCIATED WAVEMETER.

METHOD OF PRODUCING OSCILLATIONS

WHERE USED/FITTED

A self-contained wireless station for communication between a survival Craft and rescue services, meeting the requirements of the Safety of Life at Sea Convention. It is portable, buoyant and waterproof against shallow immersion. The civilian equivalent has the trade name SOLAS II SURVIVAL RADIO.

FURTHER READING

PHOTOS, SCHEMATICS, DOCUMENTS

Details of Transmitter Type 638.

NOTES.

Was replaced by Type 1251 but not covered on this site.