I've built the KAT2 and have become "stuck" at the Bull Bridge
Adjustment stage (P. 16 Rev. D Manual). No matter where I place the
trim capacitor C55, I get "Hi" on the screen when I do a Tune in CALn
mode.
Carl:
I usually make this adjustment using an old analog voltmeter on the lowest
dc votage scale. You can see the null much easier. I connect the meter
negative lead to ground and the postive meter lead to pin 4 of U1. Then
follow the directions in the manual. If it will not null then you probably
have a problem with T1. I would guess that 95% of the problems with a null
function are caused by T1 problems. (poorly tinned transformer leads, the
omission of the link between pins 5 & 6 of T1 and the leads of T1 not
installed in the correct holes in the board)
73
Jim Younce K4ZM
K2 SN: 18
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