[Elecraft] K2 VCO Alignment Problem

[Thomas D.Simes]

I can second that - following Don's advice with SN 3378, I rewound T5 with 17 turns and everything else checked out 100%.  By the way, at least in my kit I had more than enough wire to rewind a couple of the toroids which initially didn't turn out as well as I would have liked.

On Wed, 7 May 2003 06:46:26 -0500
"Don Brown" <DolfinDon@msn.com> wrote:

> 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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-- 
Tom
 
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Thomas D. Simes                                 simestd@netexpress.com 
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