[Elecraft] KPA100 option almost done...

[Don Wilhelm]

Steve,

If your dummy load is indeed a 50 ohm non-reactive load at the frequency 
of operation, it should indicate a 1:1 SWR if you used it when you 
balanced the wattmeter (C1 adjustment).  Adjust C1 with an insulated 
screwdriver because both ends of the trimmer cap are above ground and a 
mettalic adjustment tool in the slot will change the capacitance.  If 
you have any doubt about your dummy load, borrow an antenna analyzer and 
measure it at the frequency of interest.

As for the speaker, the shield will not release easily - you may want to 
consider ordering another shield too if replacement is in order.

Sometimes the speaker frame becomes distorted during shipping - often 
that can be detected by gently prying upward on the 4 frame webs while 
listening to the speaker - if the fuzziness goes away when gently prying 
one web, apply a bit more pressure in an attempt to form the frame a bit 
and get it to work satisfactorily.  When evaluating the sound of the 
speaker, do not lay the KPA100 upside down on a flat surface - the 
surface reflects some of the sound and can actually make it sound 
terrible even though all is well.

73,
Don W3FPR

Steve Kallal wrote:
> Well after about a month, I almost have my KPA100 option finished for the
> K2. I didn't accurately time the hours, but I think it is in the 25 hour
> region. This is the first serious kit I've built in years and the most
> serious ever. I had only one mistake to correct. U7, the dual op amp, was
> reversed. Once that got replaced, the amp came to life.
>  
> I have a couple of issues left, minor ones.
>  
> 1. The power does seem to vary a little bit on key down, nothing major, but
> a few percent before the power level settles. The TUNE function indicates
> 1.5:1 SWR into a dummy load. Perhaps I need to go back and retweak the SWR
> setting.
>  
> 2. The speaker sounds like the cone is bad. I ordered a bunch of parts from
> Elecraft, but the speaker slipped my mind. I will need to remove the shield
> if the speaker gets replaced. Does the adhesive comes loose easily?
>  
> Thanks for all help from this reflector!
>  
> 73,
>  
> Steve N6VL
>  
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