I can also confirm that the CW sounding noise was from the GPS, however after removing the GPS, there is still a high pitched tone on 12m and 6 meters that wasn't there before. I think it's on all bands above 17 meters, but the noise is higher on 17 meters and 10 meters, even with the dummy load, so it's hard to hear the tone on those bands.
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73, Dan - W2DLC
Daniel Conklin