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

Posted by Richard-3 on
URL: http://elecraft.85.s1.nabble.com/K1-KAT1-SWR-Bridge-Adjustment-no-voltage-variation-tp5881960p5882143.html

Thanks, Don.  I'll re-check the bi-filar toroid.

73
Rich
NU6T

On 12/30/2010 3:50 PM, Don Wilhelm wrote:

>  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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