Alexander,
The method indicated in the manual should work fine. If you have a fast
DMM, you may be able to find a deeper null by monitoring the voltage at the
'hot' end of the R2 potentiometer while adjusting for the null - just adjust
for the lowest voltage.
After setting the null, do not change the capacitor trimmer. Set the ATU
menu to CALP and adjust R1 until the power indicated on your K2 is the same
as on your external wattmeter. Your K2 is now as accurate as your external
wattmeter.
Then set R2 to the same mechanical position as R1 for reasonable SWR
indications.
The accuracy of external wattmeters is not really very good, and some may be
in error by as much as 20% of full scale (check your meter
s specifications). Notice that if you are on a 100 watt scale, that means
that your external wattmeter may be incorrect by as much as 20 watts at any
point on the scale. Even at a 5% specification (Bird slug right after
calibration), it may be off by as much as 5 watts with a 100 watt slug.
73,
Don W3FPR
> -----Original Message-----
>
> Please help me to find the best method "Null"-adjustment for
> SWR-bridge in KAT2.
>
> When I re-check internal SWR-meter with external one, I see that
> my K2 has wrong.
>
> Thank!
> 73!
> 72!
> Alex de UR5LAM
> www.qrp.ru
>
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