RECEIVER_INCREMENTAL_TUNING_CIRCUIT

Published:2009/7/17 2:56:00 Author:Jessie | From:SeekIC

D1 acts as a varactor diode coupled to the transceiver or receiver LO tuning circuit. On receive, Q1, the MPF102, is cut off and the varactor voltage is controlled by the 10-kΩ pot. On transmit, Q1 conducts; this effectively shorts the 10-kΩ pot, placing a fixed voltage on the varactor diode.



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