NASA NTRS · 19710000305
Tone-activated, remote, alert communication system
Abstract
Pocket sized transmitter, frequency modulated by crystal derived tones, with integral loop antenna provides police with easy operating alert signal communicator which uses patrol car radio to relay signal. Communication channels are time shared by several patrol units.
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Baker, C. D., Couvillon, L. A., Hubbard, W. P., Kollar, F. J., Postal, R. B., Tegnelia, C. R.. 1971-08-01. Tone-activated, remote, alert communication system. https://ntrs.nasa.gov/citations/19710000305
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