http://elecraft.85.s1.nabble.com/K1-TX-output-low-on-2-of-4-bands-tp7576307p7576308.html
Never mind. It was operator error. Helps to read the instructions.
> My K1 (#1066, built 11 years ago) is a four-bander with ATU and
> internal battery pack. In May I built an Elecraft W1 wattmeter and
> used it to discover that my TX output (When "Out" in the menu is set
> to 7.0W) is only 1.2W on 15 meters. At that time, all other bands
> showed an output of 5W.
>
> However, last night, after an afternoon of using my K1 while
> fruitlessly trying to tune up a new antenna, I noticed that the output
> on 20 meters was also now down, measuring 1.5W. I strongly suspect
> that a component failed due to TX'ing into high SWR while trying to
> adjust the antenna I was working on. 40 and 30 meters still seem to be
> okay. (My guess is that 15 is low for the same reason--I just didn't
> discover it in a timely fashion like I did with 20 meters).
>
> So, anybody have a suggestion for where to start with troubleshooting?
> Should I suspect the filter board? Any components in particular?
>
> Thanks in advance for any morsels of wisdom -
>
> Dave NK0E
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