Analogue systems are still worthwhile

1996-07-10T09:29:00

Sir - Unlike aircraft, VHF radio systems, which use a single-unit "transceiver", air-traffic-control (ATC) ground/air radio systems use a semi-duplex arrangement. With semi-duplex, the transmitter and receiver are independent items, which, ideally (in the case of ATC), are physically separated.

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