Low-cost ground-to-ground mobile telemetry link

A frequency modulated UHF telemetry link giving 5 MHz of baseband capacity with carrier to noise ratio exceeding 30 dB is described. The system is intended for ground mobile use and provides more than 1 km of coverage also in moderately obstructed terrain indicating allowable maximum path loss up to 110 dB. The mobile transmitter end uses a sturdy flexible antenna. Typical sensor signals include voltage outputs from accelerometers, strain gauges, and thermistors, but live broadcasting-quality television is also easy to implement. Digital interfacing is accomplished through suitable D/A converters, multiplexers, and coders. Both the transmitter and receiver utilize commercial-off-the-shelf building blocks in order to keep the total cost within acceptable limits.