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Re: Lost tuning range on 40m

Posted by Don Wilhelm-4 on Jul 24, 2010; 6:25pm
URL: http://elecraft.85.s1.nabble.com/Lost-tuning-range-on-40m-tp5333024p5333380.html

Ignacy,

There is nothing actually band sensitive in the KXAT1, other than there
is a unique L and C combination that would be used for any given antenna.
Might I suggest that you look carefully to see what might have changed
with your antenna.  I believe that is the most probable answer.
You might also check the toroids in the KXAT1 - there could be one that
has a poorly tinned lead but worked OK for a while.
You could also verify that all relays operate by operating each relay
using the L0-L3 and C0-C3 along with NT1 and NT2 settings in the ATU
menu - check the relays for continuity across the closed contacts after
operating them.  You will have to lift one leg of L1-L3 to check those
relays for continuity.

73,
Don W3FPR

Ignacy wrote:
> Lately ATU in my KX1 lost ability to tune on 40m well. It reduces SWR but not
> as good as before. 30 and 20m are OK. Is there anything special to look at?
> Ignacy
>  
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