TRANSMITTERS & TRANSCEIVERS

Type 5G Transmitter

DATE OF DESIGN

1940

FREQUENCY RANGE

2.9 to 6.5 Mc/s: 5.5 to 12.5 Mc/s: 11.7 to 22 Mc/s

POWER SUPPLIES

AC 50 c/s @ 100, 110, 130, 200, 225 or 250 volts. For some purposes a petrol driven generator will be supplied as an alternative source of supply.

RANGE IN MILES

TYPE OF SET

VALVE

WAVEFORM

CW

METHOD OF PRODUCING OSCILLATIONS

CRYSTAL CONTROLLED

WHERE USED/FITTED

The vast majority of Naval ships had the Portable set the Type 53 which had been designed in 1933. It had a limited frequency range (3-6 Mc/s) and was not crystal controlled: it was however a transceiver. The Type 5G was a lightweight portable general purpose H/F transmitter with a good frequency range stabilised by a crystal; it also had a better power output than the Type 53. It was used mainly by Royal Marine units, but also landed by RN ships in support of ground offensive to enhance their portable communication portfolio. Later on in WW2, the Admiralty decided to add the Type 5G transmitter to a "system" with an added receiver: the system became known as the TYPE 65.

One little story of interest. After the war, the transmitter was used by the Reserve Forces when it was found to interfere with television sets. In 1951, a letter was sent to all Reserve HQ's issuing a modification to the 5G to suppress interference. Then, in 1954, a Senior Commissioned Communications Officer (SCCO) R.N.V.W.R ('W' meaning Wireless) wrote a modification which was issued as an enclosure to an ACR (Admiral Commanding Reserves) for all Reservists. Here is the 1951 letter and part of the 1954 modification.

ASSOCIATED WAVEMETER

FURTHER READING

Book of Instructions for Transmitter 5G

IMAGES, PHOTOS, DOCUMENTS, SCHEMATICS ETC.

Two articles on Suppression of interference to T/V in Transmitter 5G

NOTES.