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Radio London - Technical


50Kw RCA  BTA 50H transmitter. Initial power 17kW, increased to (claimed) 50kW in April 1966.

Standby transmitter - 10 Kw RCA BTA 10J

A new 75kW transmitter was claimed to have been installed in June 1966, but the apparent increase in signal strength was achieved by minor modifications to the aerial.

Aerial Height

The aerial mast was tubular tapered welded-section steel 150’ (46m) high from deck level.

The aerial was a shunt feed type.

The station claimed an aerial height of 212’  (64.6m)  and had originally planned it to be 215’ (65.5m) high with a capacity hat.

Radio London News studio

Above: the Radio London News Studio

Below: Tony Blackburn in the main studio on board Galaxy


The initial studio comprised:-

2 x 16 inch Gates turntables

1 x Ampex tape machine

1 x Scully playback machine

3 x RCA cartridge machines

1 x AKG microphone

RCA 4 channel mixer

An additional studio (constructed in 1966) comprised:-

1 x 10 channel mixing console

3 x Gates turntables

1 x Scully  playback machine

1 x Ampex tape machine

1 x AKG microphone

Right: The aerial mast on board Galaxy

QSL Card

Radio station engineering departments issue QSL cards to verify reception reports received from listeners

Thanks to Ian Anderson for providing information from his research into offshore radio aerial masts (originally published in Offshore Echos Magazine December 2007 and April 2008)

Click image to enlarge

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Key Dates

Ship and Location




Key Dates Ship and Location Staff Programmes History

Treasure Chest

Treasure Chest

Left: Close upof the studio microphone

Back to Britain Gallery


Back to Radio London

Radio London