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  1. K

    TS-520S transmit hum

    Stations receiving my SSB signal detect hum. Removing the microphone from the radio did not fix it. I went to the CW mode and transmitted CW and no hum was heard by the receiving station. Since the hum is not there on CW I don't suspect the 800 volt (PA) or 300 volt (driver) supply filter...
  2. K

    TS-520S transmit hum

    Stations receiving my SSB signal detect hum. Removing the microphone from the radio did not fix it. I went to the CW mode and transmitted CW and no hum was heard by the receiving station. Since the hum is not there on CW I don't suspect the 800 volt (PA) or 300 volt (driver) supply filter...