[Elecraft] Slighty off topic - 80 meter second harmnic how to stop

[paulb]

Hi folks

slightly off topic

running 2 x K3 80 and 40 meter cw. Separate antenna
about 50 meters apart. 100 watts.

Power supply 14 volt dc via batterys + dc charge.

The 80 meter second harmonic is very strong. No surprise so have done 
the usual 80 meter band pass filter and quarter wave stub

For what ever reason the harmonic is still very present..darn..
oddly has a rasping note not pure carrier.

A close ham about 400 meters away can also hear the 2nd hamonnic, 
band pass in or out makes little change.

Possible is related to coax feedlines running close for some distance ?
Both are very well choked at feeder and TX

Happy to respond off topic 


cheers from ZL

Paul 
zl1ajy





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