[Elecraft] K2 VCO Alignment Problem

Wed May 7 10:34:00 2003

You guys making me curious now!! I had no problem getting the correct 
voltage from L30.....but, now wondeirng if there's any advantage to 
rewinding T5 to 17 turns for more voltage headroom? I wonder if the manual 
should be changed to 17 turns?

tnx and 73....ed

>From: "Thomas D.Simes" <[email protected]>
>To: [email protected]
>Subject: Re: [Elecraft] K2 VCO Alignment Problem
>Date: Wed, 7 May 2003 06:07:00 -0800
>
>
>
>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" <[email protected]> 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" <[email protected]>
> > To: "Elecraft" <[email protected]>
> > 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
>
>======================================================================
>    "Z-80 system stack overflow.  Shut 'er down Scotty, the system's
>          sucking mud" - Error message on TRS 80 Model-16B
>
>Thomas D. Simes                                 [email protected]
>======================================================================
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