Mel,
Yours sounds a lot worse than mine does! You can definitely hear a solid tone, though, with or without the GPS. With the GPS there is the on-off code like tone under the other solid tone. My QMX high band does not have either of these tones, but my QMX+ seemed to begin having them after I installed the SSB Beta firmware and started experimenting with the band edges over the course of a couple of hours. I think something in the audio line became more sensitive to interference somehow.?
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73, Dan - W2DLC
Daniel Conklin