[Elecraft] SWR Bridge Null adjust HELP

[Don Wilhelm]

Dohn,

Separate the bridge null adjustment from the Hi-Cur situation - they are two
separate things.  Attack the Hi-Cur first.  Initially set the trimmer cap to
center and center the R26 and R27 pots - that will be good enough until you
have found the source of the Hi-Cur display.

First check the basic K2 (KPA100 disconnected entirely) for good power
output with reasonable current draw (about 2.5 amps max at a 10 watt
setting).

Then add the KPA100 back in and check for the Hi-Cur message on each band
(also look at the current draw of the base K2).
Determine which bands cause the Hi-Cur display and check the KPA100 Low Pass
Filter for those bands.
OTOH, if you have a Hi-Cur and no output on all on all bands (see
'Transmitter Problems' in the manual), check out the T-R switch components,
R21 & R22, T1 and other nearby components (see the schematic to identify
those components).

73,
Don W3FPR

> -----Original Message-----
>
> I have my KPA 100 connected.  It was just completed.  When I attempt to
> perform the SWR null adjustment, I get a high current warning.
> It switches
> to the info screen, indicating 0.1 watts volts (even though I
> have the power
> set at 5.0 watts) and SWR 1.0:1.  I have the parameter set to
> "High current"
> = 3.5.  I didn't want to leave it tune mode with this warning, but I did
> quickly look to see if adjustment of C1 made any difference and
> it did not.
> There was no change in the SWR reading through C1.
>
>
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