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The oscillator also contains a differential amplifier into which both the signal oscillation and reference  oscillation are fed. The output from the differential amplifier is a 16 kHz sine wave, the amplitude of which  is the difference between the signal oscillation and the reference oscillation.

After modulation the resultant voltage is fed along a 50 Ω coaxial cable to a receiver.  The oscillator contains line drive amplifiers to enable  up to 100m (328 ft) of cable to be driven.

Other Electronics for Continuous surfaces


The locally mounted oscillator drives the guard at 16kHz at a constant amplitude. This induces an  identical sinusoidal oscillation on […]

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