[Lowfer] Spectrum Lab v 2.2

[Bill Ashlock]

"My Kenwood must drift too much for QRSS modes"

Hi Rick,

Your drift is a common problem when using up-converters in for QRSS modes. Unfortunately the typical microprocessor Xtal, when used this way, is not stable enough to hold a straight line. If you work out the math you will find that a tiny percentage drift, like 1ppm/deg F will represent a large change (in Hz) at the upper frequency - the freq that your receiver is tuned to.

Bill

> From: theumpire at verizon.net
> To: lowfer at mailman.qth.net
> Date: Tue, 27 Oct 2009 20:52:49 -0400
> Subject: Re: [Lowfer] Spectrum Lab v 2.2
> 
> Hi Charlie,
> 
>  I also built Lyles upconverter.It works nice with my receiver for NDB and 
> cw stuff.However ; my Kenwood must drift too much for QRSS modes.I cant keep 
> it tuned in all night while searching on ARGO . Thats why Im gonna run a 
> downconverter and  use the software I.F. I have a 170khz  crystal thats dead 
> on so calibratiion will be a snap.
>  Thanks
>              Rick
> KA2PBO  "PBO" 187.2 khz /qrss 60
> 
> 
> 
> 
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "Charlie , W5COV" <cvest at cox.net>
> To: "Discussion of the Lowfer (US, European, &amp; UK) and MedFer bands" 
> <lowfer at mailman.qth.net>
> Sent: Sunday, October 25, 2009 10:26 PM
> Subject: Re: [Lowfer] Spectrum Lab v 2.2
> 
> 
> >I used Lyle's software downconverter back when he first released it and had
> > good results with it .
> >
> > Another way to go is with a cheap upconverter , that I know several people
> > who are using it can be found at :
> > http://home.att.net/~jacksonharbor/lfconv.htm
> >
> > I have built and given away several of these and for the price they do a
> > nice job . They too were an original design of Lyle's .
> >
> > Usual disclaimer , no financial interest , etc.
> >
> > Charlie ,W5COV
> >
> > CV , 185.29825 kHz. , QRSS60 , 24/7 , EM26ex , OK.
> >
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