[Elecraft] K2 AGC Threshold Adjustment

[Robert Tellefsen]

Jim
Since the problem is the same between two radios built
some time apart, I have to ask, are you using the same
meter?  If so, try borrowing one from a friend and make
the measurement.  It is possible your meter is a bit off.
At least, it's worth a simple test.
Good luck and 73
Bob N6Wg

----- Original Message -----
From: "Jim Stoneback" <jstonebk at shentel.net>
To: <elecraft at mailman.qth.net>
Sent: Monday, October 08, 2007 11:53 AM
Subject: [Elecraft] K2 AGC Threshold Adjustment


> Hi,
>
> When I built my K2/100 the threshold adjustment didn't go right, I turn
> trimmer R1 full CCW to get 3.74v on pin5 of U2 (full CW pin 5 goes to
2.6v).
> This adjustment is supposed to swing U2 pin 5 fom from 4 to 8 v.  I
checked
> diode polarity, resistor values, everything but never did find the
problem.
>
> Now I'm building another K2 and have encountered exactly the same result.
> Anybody got a clue?
>
> 73,
>
> Jim
> Jim Stoneback
> K4AXF
> Drake SW8
> K2.ssb.100 sn 6194
> K2 sn 6263 (underway)
>
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