[Elecraft] KPA-1500 ATU not working well

[K9MA]

My observation , also.

Another approach would be for automatic drive adjustment, or ALC that worked. The latter, I know, is very difficult to do with an amp.

Scott K9MA 

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Scott Ellington

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> On Jun 22, 2018, at 2:36 PM, Paul Baldock <paul at paulbaldock.com> wrote:
> 
> I have found that if the KPA1500 is feeding  a largish SWR (like 1.5:1 as you suggest) then the drive power required to maintain a constant output will vary significantly as you tune across a band. This means you have to keep adjusting the power control within a single band. This appears not to occur if the SWR is 1.1:1 or better.