[Elecraft] K1 Low power output on one band

[Paul Barlow]

Dear Elecrafters,

I'd like some advice before I go delving into something and making it worse! I have taken my 4 band K1 out of storage. It is set up for 40m, 30m, 20m and 15m. It also has the auto ATU. On checking it out I find output as expected on 40m & 30m - 5W set gives 5W out on my dummy load. But on 20m I'm only getting about 1W out for 5W set, on 15m I get an indicated 4W.

My first guess is that I need to revisit the tuning of the trimmers on the filter board of the 15m and 20m (the manual reminds me to trim 15m first) bands.

I need to remove the ATU to do this and I find in my manual a cryptic note to say I need to move a jumper on P3. I think that will then route the RF to the antenna rather than to the not connected ATU.

Any more advice would be helpful before I dive in.

73,

Paul EI5KI