[Elecraft] K2 VCO Alignment Problem

[Don Brown]

Hi

This is a common problem on <3000 S/N K2's. Just rewind T5 with 17 turns and
it will be fine. I had to do this on several K2's including the one I built
for Eric. Before rewinding T5 try squeezing the turns as close together as
possible, that may get the voltage up enough with 16 turns.

Don Brown
KD5NDB


----- Original Message -----
From: "John R. Lonigro" <johnlon@earthlink.net>
To: "Elecraft" <elecraft@mailman.qth.net>
Sent: Wednesday, May 07, 2003 6:45 AM
Subject: [Elecraft] K2 VCO Alignment Problem


> Everyone:
>
> I've finally reached the "Alignment and Test - Phase II" of my K2
> (#3401) assembly.  I was unable to adjust L30 sufficiently to get the
> voltage at R30 up to 6.0 volts at 4000 kHz.  On 80 Meters, the range is
> 1.42v (3500 kHz) to 4.19v (4000 kHz).  I can get 6.0 volts at 4176 kHz.
>  If I increase the frequency up to 4312 kHz, the reading makes it all
> the way to 8.35 volts.  On all the other ham bands, the voltage ranges
> from a low of 3.02 (15M low) to 5.80 (40M high).
>
> The hint says I probably wound the VCO inductor (T5) wrong or installed
> the wrong value at L30 or C72, but I used the right color toroid
> (yellow), the right number of turns (16 and 4) wound in the right
> direction, and the values at L30 and C72 are correct.
>
> Any ideas??
>
> John AA0VE
>
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