DTMF Remote Control for Beacons and Repeaters

摘要

The unit described here is intended for the remote control of beacons and repeaters where a permanent telephone line is available for secure control. The unit may be used with a duplex radio link, for example when controlling a repeater, but for simplex(transmit/receive)operation, hardware and software changes will be required. Furthermore, issues such as security of control codes may inhibit its use over a public radio channel.