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An extract from the author's paper entitled - WW2 British Army Battlefield Wireless Communications Equipment.
WS10 trailer and aerials.
WS10 Mk I (used during last stages of WW2). Two transmission frequencies, 4.547 GHz and 4.762 GHz, with a different magnetron (CV79 or CV89) for each one, conveying the microwave output via a circular waveguide to parabolic aerials. The magnetron power output is 200 mW, giving a line-of-sight range of around 50 miles. The Mk II version is tunable and uses a velocity-modulated valve (CV228, Heil tube), giving much increased power output but was not introduced until after WW2.
For each of the eight speech channels, the pulse width is 3.5 μs, varied by modulation ±2.3 μs. A 20 μs synchronising pulse is added to each 111 μs frame containing the eight channel pulses. Amplification of the incoming frequency was not possible, so the incoming signal is converted to a 45 MHZ IF using a crystal mixer and the 3rd harmonic of a tunable 1,500 MHz triode oscillator.
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