[Elecraft] KPA100 D1-D8 voltages

[Don Wilhelm]

Ben,

THose voltages are not 'spec', but they are guidelines for troubleshooting.
The oscillator activity will vary a lot from one unit to another, and a 10%
variation either way from the values stated is usually OK - The important
voltages are at the D1 cathode and the D7 anode.

Two points - 1) there is a new Diode voltage chart in the current level
errata sheet - download it and use that chart.
2) is the R4 value on your KPA100 board 100k?  If not change it to 100k and
that will drop your D1-D8 voltages down a bit if your current R4 value is
39k.

73,
Don W3FPR

> -----Original Message-----
>  I don't know if I should be concerned about this or
> not since the final high voltage is within spec (now
> that I'm measuring at the right test point), as is the
> negative supply for the RS-232.  Here's a list of my
> measurements at D1-D8.
>
>                Spec                  Mine
> Diode     Anode     Cathode     Anode     Cathode
> D1        32        130         21.1      138
> D2        84        32          89.0      20.9
> D3        21        84          18.1      88.7
> D4        36        21          38.2      17.1
> D5        24        36          15.9      38.2
> D6        13.7      24          13.5      16.0
> D7        -22       -8.8        -24.1     -1.1
> D8        -8.8      0           -1.1      0
>
> Any insight would be appreciated.
>
> -Ben  K1NT
>
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