Re: K2 Transmitter Alignment

Posted by Doug Person on Nov 21, 2006; 11:34pm
URL: http://elecraft.85.s1.nabble.com/K2-Transmitter-Alignment-tp441101p441103.html

Hi Don,

I found the problem.  and you were right - it was the bandpass filter.  
I had C220 and C221 reversed.  After a bit of fooling around and
realigning, 17 is OK.

What I now have is generally low output.  About 9 watts 80 through 20, 6
watts on 15 and only 3.5 on 12 and 10.

Any thoughts?

Thanks & 73,

Doug -- K0DXV

Don Wilhelm wrote:

> Doug,
>
> The only thing unique to 17 meters is the 15/17 m bandpass filter and the
> 17/15 m Low Pass filter, and I would suspect the bandpass filter as the most
> likely.
>
> Look first at the slugs of L10 and L11 - they should be about the same
> distance down from the top of the cans - if they are not, check capacitors
> C30, C31, C35 and C36 for proper values and proper soldering.
>
> If the slugs are the same distance down in the cans (within a half turn),
> then check the trimmers C32 and C34.  The trimmers will normally be set
> close (within 20 degrees of rotation) to the midpoint - the slots in the
> trimmers perpendicular to the flat side.  If that is not the case (and the
> checks above for the 15 meter tuning are correct), then the most likely
> thing is a soldering problem at relay K6 or trimmer capacitors C32 and C34.
>
> Look at the RF Board schematic sheet 3, and on the left side find the 15/17m
> bandpass filter.  Check all the components shown in that schematic area for
> proper soldering and correct values.  Include relay K6.
>
> 73,
> Don W3FPR
>
>  
>> -----Original Message-----
>>
>> I have completed Transmitter alignment.  With the power set to two watts
>> - I get 2 watts or better on all bands except 17 where I get only .5
>> watts out regardless of the power setting.
>>
>> Any help appreciated.
>>
>> Thanks,
>>
>> Doug -- K0DXV
>>
>>    
>
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