[Elecraft] KAT2 set-up problems

[Dave Gingrich K9DC]

At 16:37 9/8/2002 +0200, Peter Halpin wrote:
>Hi all,
>
>I'm having some trouble setting up my KAT2 bridge null (CALn).
>
>Whatever I do I can't get the reflected voltage under about 7mV, and if I do
>get it that low it tends to vary a little - generally between 7 and 11. I am
>using a dummy-load that is good up to above 1.5GHz, so I don't think that
>that could be the cause of the problems. I have replaced the capacitor with
>an miniature air-dielectric model because the one supplied seemed to be a
>bit dodgy, and I have of course checked the SWR bridge several times, even
>going so far as to re-wind the transformer - but I can't get a reading lower
>than 7-11mV.
>
>Can anybody give me a nudge in the right direction, please? Or am I worrying
>about nothing?

That particular adjustment IS hypercritical. Adjusting the power level to 
keep the reading in range helps, but anything less than 10 is okay.  I 
wouldn't worry about your 7-11.  I think I got mine to around 4, after 
fiddling with it for a couple of hours.

================================================
Dave Gingrich, K9DC - Indianapolis, Indiana  USA
K2 #2211, K1 #931, QRP-L #2376, ARS #1109,
FPQRP #389, IRLP 473/573,  k9dc.ampr.org
================================================