Les,
Check to be certain you have installed Q6 and Q7 the correct way 'round.
Second, what is the value of C31 in your kit? It was recently changed
to 0.22 uf to cure an oscillation that occurred in a few amplifiers with
the new T-R switch design (Rev D manual).
The kits available in
I am currently building up a KPA100 amplifier (i.e., a recent vintage unit
purchased at the Orlando Hamcation Elecraft booth in February, 2007) and
have reached a problem during the alignment and installation phase of this
build. My basic K2 is a Rev. B model (i.e., S/N 4751).
The first weird
Folks,
I solved the problem with the SWR Bridge null adjustment (CI) by reflowing a
bunch of solder joints (i.e., Don's usual suggestion) around T1, R21 and R22.
However, now I have a new problem - I am drawing to much power in the transmit
tests of on pg 50 of the KPA 100 manual. My metered
Les,
The most usual reason for excessive current is the Low pass filters -
check the toroids for an extra turn - count the number of times the wire
passes through the center of the core.
Also carefully check the calibration of the wattmeter forward power pot.
Also check the bias setting
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