[DSP-10] Re: [DSP-10]! VHF VCO,

Wed, 28 May 2003 08:20:33 -0700

There's the changing of C113 to 6.8 pF (from 10 pF that is supplied in the
TAPR kitting) to help with the tuning of the PLL.

On my first DSP-10, I shaved pat of the slug off and reinserted it (I read
about doing this on the DSP-10 list).  This has help me as I still have the
10 pF cap in C113 on this DSP-10.

I am building a second DSP-10 for Art and I put the 6.8 pF in it.  I'll soon
be testing it to see how it will tune.

- Steve, N7HPR
  ([email protected])

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Jimmy Oldaker W7CQ
> Sent: Tuesday, May 27, 2003 9:49 PM
> To: [email protected]
> Subject: [DSP-10] Re: [DSP-10]! VHF VCO,
>
>
> At 09:45 AM 5/27/03 , you wrote:
> >A few peculiarities with my unit, the VHF VCO would not lock unless the
> >slug in L102 is removed from the can. The control voltage is 2.5V at 147
> >MHz and approx 0.5V at 144 MHz. PLL operation appears normal although the
> >control voltage is a volt or so low. I can raise the voltage pulling the
> >slug in slightly into the can but the slug hangs out of the can loose.
>
>
> Bob and All
>
> here is a fix we noticed for the first kitting of the DSP-10
>
>
> In the middle are a couple of red paragraphs about the locking of the
> VCO.  This might help.  We too noticed the slug needed to be
> almost falling
> out to work and this is the fix.
>
> This can be found on our web site.
>
> http://home.teleport.com/~oldaker/dsp10_repository.htm
>
> Under DSP-10 initial testing . doc.
>
> CONGRADULATIONS and good work!
>
>
> Jimmy   W7CQ
> 73's  -  Jimmy  -  W7CQ -  CN83jx
>
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>
>
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