[Elecraft] KIO2-Induced Problem

[Jim Campbell]

Don,

Bingo!  Give the man a cigar.  I didn't go through the S-Meter
calibration because the RF Gain control had no effect on the S-Meter. 
Pin 5 of P1 measured 4.16 volts regardless of the setting of the RF
Gain.  The pin 6 voltages were as you predicted, i.e., OK.  I then
removed the Control Board and found that I had soldered the end of the
4" jumper and the capacitor to one side of the line of capacitors C2, C3
and C4. (I had mistaken the line of capacitors for the back side of P4.)
I'm ashamed to admit the error, but in doing so I might help someone
else. When I moved the jumper and capacitor to the correct pins on P4,
the problem went away.

Thanks so much.  Happy New Year to all!

Jim
W4BQP
K2 #2268

DolfinDon@aol.com wrote:

> Go back and check the smeter cal on page 46 of the manual. If the cal is OK
> then recheck all of the modifications to the control board. Make sure you cut
> the right run and have all if the jumper wires installed right. Measure the
> voltage on pin 5 of p1 on the control board. This should be about 3.9 v with
> rf gain cw and 4.15 with control ccw. If not check pin 6 of p1 RF gain input.
>  The voltage should be 0.0 with gain control cw and about 2.4 v ccw. If all
> is OK at p1-6 but not at p1-5 then look around U2 and Q12 for a problem.