TXD_CutOff_SDR
A FET/Relay based RF/TXD cutoff switch to protect SDR receivers which share the same antenna with a transceiver. Input signal from the transceiver, in this case a Yaesu FT-991A is taken from the SQL pin on the Data port miniDIN 6 pins socket, as it's on a HIGH 5V level during RX and LOW 0V on TX. The relay is constantly energised with the HIGH signal and will disconnect the SDR under a LOW signal.
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