![]() The transceiver board is capable of working at any frequency from 10 kHz to 500 MHz but does not contain the local oscillator, preselector, RF power amplifier and power supply. The transmitter and receiver sections are arranged so that no signal switching is required between transmit and receive, and the RF components are common to both. The transceiver, shown in Fig.1, consists of a single conversion superhet receiver with a 9MHz IF and a very efficient audio-derived AGC system. This web-page is maintained for the benefit of people who already have a G4CLF transceiver, and not to encourage anyone to build one. These circuits are virtually unobtainable today and this transceiver should not be attempted unless you have more than sufficient ICs to build it. It uses the Plessey Semiconductors' SL1600 family of integrated circuits for radio systems, which was made obsolete in the early 1990s. The G4CLF Transceiver is the heart of a simple, but high performance, SSB transceiver system developed in the Applications Laboratories of Plessey Semiconductors Ltd in the late 1970s and published in 1980.
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