KX1 hum on 30 meter signal

[Andrew Moore-4]

I listened to my KX1 signal on 20, 30 and 40 meters today by using another receiver.  On 30 meters the signal sounds a little distorted, as if there's some kind of hum superimposed on the signal.  This does not happen on 20 and 40 meters.  Before I start digging in, has anyone experienced this on their 30 meter KX1?  The 30 meter option board is clearly a good candidate to check first...

Thanks,
--Andrew, NV1B


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[Andrew Moore-4]

By the way, this occurs both on battery power and external 13.8 VDC.  On batteries the output power was about 400 mW and on 12 VDC it was about 4 W.


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