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By Barry Fox A covert communications system for helicopters and other military aircraft is revealed in GB 2 320 151. The infrared anti-collision lights currently used on aircraft are practically invisible to the naked eye, but show up clearly with night-vision goggles. The intensity or rate of flashing could be varied to carry messages, but this would not be very secure. So LFD of Gosport, Hampshire, proposes using two infrared transmitters with different wavelengths, only one of which is visible with night goggles. The invisible infrared would carry speech and data superimposed on bursts of 120-kilohertz pulses. The anti-collision system works as usual and masks the secret information,
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