Forgive me if this has been already asked, but I cannot seem to find the answer. My QMX+ is showing some signal every 500Hz in USB mode (and in DIGI mode) on RX. I hear it in the headphones as a light tone or series of tones a little louder than the static. My Yaesu FT-710 doesn't hear these tones when connected to the same antenna. This morning I made another MFSK144 contact with the QMX+ with a station I had just contacted on the FT-710. Same set up, same antenna, only difference is the radio used. The FT-710 was "hearing" the MSK144 signals, but they were light. The QMX could not "hear" the same signals, the "birdies" were louder than the signal. Almost as if AGC was adjusting to the birdies and not to the background noise. Here is a screenshot of the waterfall in WSJT-X showing the birdie signals. Notice the fairly solid lines every 500 Hz and the not quite as solid ones every 250 Hz.
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I see the "birdies" on every band, but they get more pronounced the higher the frequency is. At 40m they are barely there, at 6m very obvious. Does anyone know what they are or how to get rid of them?
