Now: I removed Z1 and found the voltage measured at the collectors
of Qs 1 and 2 to be -0.4V (J3+ is ok now). I don't know where it
could come from.
Hi Gerhard:
Dunno if this is related, but I got a small voltage J3 by shining a
bright light on the final transistors. There is some sort of
p
5:14 PM
Subject: Re: [Elecraft] KPA100 Problem still exists, but some new
measurements
> G'day,
>
> Did you have a light shining on the PA transistors? J3+ on my KPA100
> had -0.18V. Apparently something to do with illumination of the PA's.
> Well noted by others.
>
G'day,
Did you have a light shining on the PA transistors? J3+ on my KPA100
had -0.18V. Apparently something to do with illumination of the PA's.
Well noted by others.
Regards,
Mike VP8NO
- Original Message -
From: "Gerhard Schwanz" <[EMAIL PROTECTED]>
To:
Sent: Friday, February 0
Gerhard,
That small negative voltage may be coming from the AC ripple on the '90-150
V' supply to the TR switch that is being coupled through the RF chokes and
capacitors into the Q1 and Q2 collector circuit and then being rectified by
the transistors themselves. If that is the case, it may not b
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