[Elecraft] KAT2 Bridge null adjustment

[Don Wilhelm]

Ed,

The most common cause is T1 connected incorrectly or having 
insufficiently stripped and tinned leads, so check that first.
The HiCur message may indicate a bad or incorrectly oriented diode.
Check all the components in the wattmeter area for good soldering and 
correct values T1, D1, D2, C54, C55, R3, R4, C50, C51, R1, R2, C52, and C53.

Check for continuity from the center conductor of the input cable to the 
center of the selected BNC antenna jack - you should find a very low 
resistance (quite close to zero).  Also check for a short from the 
center conductor to ground.

A relay that is not operating properly (due to an unsoldered pin) can 
also cause that behavior.

If that does not correct things, I can tell you how to bypass the L-C 
board and test the wattmeter section alone.

73,
Don W3FPR

On 8/13/2011 2:03 PM, EMD wrote:
> Hello,
>
> When I adjust C55 I initially get a high current message that last for a
> second, followed by a fluctuating power indication.  The lowest I can adjust
> c55 down to is 1.7 volts.
>
> So what have I missed.  Thanks in advance.
>
> 73,
> Ed ke7hga
>