Re: KAT2: Can't Get Bridge Null Adjustment (C55) Below 012 mV

Posted by Julian, G4ILO on Oct 19, 2007; 4:05pm
URL: http://elecraft.85.s1.nabble.com/KAT2-Can-t-Get-Bridge-Null-Adjustment-C55-Below-012-mV-tp454913p454915.html

It's a long time since I built my KAT2 but I seem to recall having a
similar issue myself. I don't think it matters that much. To put my
mind at rest I made a 100 ohms load capable of taking a few watts for
a short period and checked that I got a 2:1 reading when transmitting
into that, and 1:1 into 50 ohms.
--
Julian, G4ILO K2 s/n: 392  K3 s/n: ???
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf


On 10/19/07, Michael Linden <[hidden email]> wrote:

> I'm performing the Bridge Null Adjustment (C55) on my KAT2, but can't
> get it below 012. It is clear when adjusting C55 that I _AM_ centered
> in the middle of a "dip". However, I can only get the value to go down
> to 012. Per the manual, I've checked T1's windings and their continuity
> and have checked the continuity and arrangement of the cable wires (J7
> and J8) -- I don't see any problems.
>
> Is a minimum value of 012 "good enough", or do I need to look more
> closely at the SWR bridge components?
>
> How might the operation of the KAT2 be affected by this "higher than
> normal" value?
>
> Thanks,
> Michael N9BDF
> K2 #4137
>
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