At least a few of us saw exactly the same thing in the last few weeks.
We never heard anyone giving grave warnings that we were in
trouble...so I don't know what to tell you, except that I'm in exactly
the same boat.
I planned on measuring it again when I get to the next alignment/test
where that board is powered up. For now I'm still winding toroids.
-Paul KB8NMZ
K2 #4818
On Apr 9, 2005, at 7:38 AM, Evert Bakker wrote:
Hi all,
I'm assembling the K2 here (SN 4836) and came to the first
check/alignment. No smoke here so far, but when adjusting the setting
for the AGC as described on page 47 I became suspicious about the
alignment procedure. Adjust R1 for 3.80 V on the DMM. I turned R1 and
reached the end and got stuck on 3.78V. The absolute value of 3.78
doesn't worry me but that I ended up at the limit of the R1. I thought
I should check all variables like DC voltage which should be 8V (was
7.98V so OK). Checked the resistors (mainly RP6 / 5.1K) and, RF gain
potentiometer 5K and the R1 (50K). All looked fine. So what's wrong?
I started making calculation on the resistor dividing network and came
to the conclusion that the maximum voltage (theoretically) could be
close to 3.82V when the RF-gain is fully CW (0 Ohm) and the R1 is
set fully CCW (50K).
I wonder if something is wrong here and if not, why was the alignement
procerdure setup like this (it could heve been something like: Set
RF-Gain full CW, R1 full CCW and check the voltage at pin 5 of U2 to
be close to3.80V)? Or did I miss some errata info?
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