[Lowfer] Sampling Rate and Frequency Calibration

[John Andrews]

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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