[Elecraft] KPA100 check result questions

[W3FPR - Don Wilhelm]

Gerhard,

The voltage at D13 and U4 are a bit higher than they used to be - they
increased when R4 was changed from 100k to 39k, all is well with those two.
Your voltage at TP1 is good, but you may want to re-check J3+ (red) - while
0.1 volts may just be some artifact of your meter, the voltage should really
be zero.

I don't have an immediate answer on your fan situation, but it likely won't
hurt anything, so finish everything and see what happens with it.  Yes, CAL
tPA should be remembered.

73,
Don W3FPR

> -----Original Message-----
>
> I'm still in the process of building my kpa100. After
> my learning process concerning soldering :-) I
> stumbled upon some voltages.
>
> I'm on page 43 in the manual now and got some numbers
> a bit off the given values (PS is 14V).
>
> D13 154V
> U4 -27.4V
> TP1 0V
> J3+ 0.1V
>
> Are these numbers ok? Especially the last two?
>
> Another thing. The fan at this stage is a bit out of
> control. Calibrating tPA helps, but the K2 seems to
> not remember this setting. Also strange is that while
> setting tPA a relay can be heard switching. But maybe
> this is normal at this point in the process?
>
> Kind regards and keep on building...
>
> Gerhard
> DH3FAW
>
>
>
>
>
>
>
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