[Lowfer] Sampling Rate and Frequency Calibration

[John Andrews]

Jay,

That melds the sampling rate calibration and receiver calibration together. Interesting, but there are probably consequences. 

JA

> On Jan 21, 2014, at 9:48 PM, "Jay Hainline" <ka9cfd at mtcnow.net> wrote:
> 
> FWIW, in the calibration window, I have my measured frequency programmed as 700.17, displayed frequency, 700 and the offset is then the frequency I want to display minus 700 as I use a 700 hz pitch in cw mode on the radio. The .17 is what my radio appears to be off frequency by. Hope that helps with your setup in Argo and it doesn’t give me a weird frequency display on the screen.
> 
> 73 Jay
> 
> 
> 
> Jay Hainline KA9CFD
> Colchester, IL EN40om
> 
> -----Original Message----- From: John Andrews
> Sent: Wednesday, January 22, 2014 02:43
> To: k3siw at sbcglobal.net ; Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands
> Subject: Re: [Lowfer] Sampling Rate and Frequency Calibration
> 
> Garry,
> 
> Yeah, that's the catch for me. If you enter something like -0.21 Hz, you
> get a very non-integer display on the right. Argo didn't originally do
> that, nor does Spectrum Lab.
> 
> JA
> 
>> On 1/21/2014 9:28 PM, Garry Hess wrote:
>> John, I like to use a pitch of 400 Hz so I've programmed the offset as
>> 73921 (Hz). With an SDR-IQ center frequency of 73921 Hz, USB that places
>> 74321 Hz in the center of the ARGO waterfall, which is near where Bob,
>> WG2XRS/4 is sending tonight. It's centered of course because I
>> left-click the frequency scale up or down as needed to make it so. When
>> I listen with a 1000 Hz pitch I must move the frequency slider up quite
>> a bit so that pitch is centered in the waterfall. It's easiest to do
>> that using 0 Hz as the offset, then after 1000 is showing in the middle
>> of the waterfall I add the tuning value, adjusted by tuning error, if
>> any. I can specify the 66.666... MHz SDR-IQ clock to within 0.5 Hz so
>> when I'm receiving that way, as opposed to using my alternate IC706MkIIG
>> receiver, there isn't any significant tuning error.
>> 
>> 
>> 
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