Re: K1- KAT1 SWR Bridge Adjustment--no voltage variation.

Posted by Don Wilhelm-4 on
URL: http://elecraft.85.s1.nabble.com/K1-KAT1-SWR-Bridge-Adjustment-no-voltage-variation-tp5881960p5882048.html

  Rich,

You have the capacitor mounted correctly, the narrow end is flat while
the broad end is rounded.
You are also correct to adjust it with a non-metallic tool - both sides
of the capacitor are above ground and will be de-tuned if you touch
either of the plates.

I suspect your problem is not with the capacitor, but with the bi-filar
wound toroid.  Check that carefully for the proper leads in the right
holes, and make sure the leads are well tinned - you should be able to
see a bit of tinned lead above the board - if not, be suspicious of it,
even to the point of removing it and re-tinning the leads..

73,
Don W3FPR

On 12/30/2010 5:42 PM, Rich NU6T wrote:

> I'm in the final stages of testing/adjusting a newly built KAT1 board in
> a 2-band K1 (RF Board rev E).  In the SWR Bridge adjustment task, I'm
> not seeing any voltage change beyond what seems to be random noise.  I'm
> using a plastic adjustment tool and a DMM.
>
> I'm concerned I may have installed trimmer C9 backwards.  It has a
> broad/wide side and a blunted narrower side.  Instructions call for the
> flat side to the left.  The broad side seems curved, so I placed the
> narrow side to the left, wide side to the right.
>
> Instructions indicated to follow the pattern on the board for C9
> installation, but my board has two holes and what look like horizontal
> parentheses with no indication of broad, flat or narrow sides.
>
> The manual notes that the null may be sharp.  I'm not seeing it.
>
> Thanks for any advice.
>
> Rich
> NU6T
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