high pitched wine on 80 and 40 M


jfein2000@...
 

Hi tried to search for this issue on the forum but without success.  My microbitx works on all bands, transmit and receive but I experience a high pitched wine on 80 and 40 meters.  It isn't present on 20 meters or on 160 meters for that matter.  Any suggestions would be much appreciated.  Thanks Jeff
 

 

 

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