SOLAS Lifeboat Set

The International Marine Radio Co. Ltd. (I.M.R.C.) " SOLAS " (Safety Of Life At Sea) set transmits on the international distress frequencies of 500 kHz and 8.634 MHz. There is clockwork-driven automatic keying for the alarm signal, SOS, and direction-finding dash, with hand-keying as an alternative. Telephone modulation is also provided. Reception is on 500 kHz only. The set is powered entirely by a hand-turned generator; an extra crank is provided so that the work may be shared by two men.

For transmission, the three valves work as master oscillator, power amplifier and modulator; modulation for m.c.w. telegraphy is square-wave, giving the wide-band characteristics desirable for distress calls. The note is distinctive and readable through interference. There is a tuning indicator as an aid to adjusting the aerial circuit; this is needed for obtaining maximum radiation under all conditions, as a fixed aerial supported by an 18ft mast is used as an alternative to the kite aerial.

For reception, two of the valves become RF amplifiers and the third an AF amplifier; there is a germanium diode detector. An external crystal receiver can be provided; this permits listening without turning the generator.

The set is contained within a completely waterproof light alloy case which can withstand rough handling. The spindles of the controls work in waterproof sleeves, so the gear can be operated in bad weather with the front cover removed.

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