[Elecraft] K3 no effective TX on 3.5 or 10MHz bands

[Michael Carter]

Hi Andy,

What is the receive sensitivity like on those affected bands?

The 3.5 MHz and 10 MHz bands share no common components in either the bandpass filter or lowpass filter sections.  Those are usually the first line of investigation for band specific lack of output power.  If those bands have poor receive sensitivity, I would check the relays on the bandpass filters for those bands first to be sure that you have connectivity through the filter. The 3.5 MHz filter also is used on 160 meters with additional capacitors switched into place, and the 30 meter filter is shared with 20 meters using the same arrangement.

Please let us know what your find in receive mode on each band.

Thanks, and 73,
​
Mike, K8CN