[Elecraft] K1 Low power output on one band

[W3FPR]

Paul,

Yes, it does sound like your 4 band filter board needs to be re-aligned.
Remove the KAT1 and install the jumper.
In addition, you must set the switch next to the BNC connector to the K1 
setting in order to maintain power control.
If you do not have that switch, then you have an older K1 board and you 
must re-attach R36 on the bottom of the RF Board.

73,
Don W3FPR

On 7/12/2023 5:06 AM, Paul Barlow wrote:
> 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
>
>
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