[Lowfer] Sampling Rate and Frequency Calibration

[Jay Hainline]

Well I am not guaranteeing perfection. :-)

Jay Hainline KA9CFD
Colchester, IL EN40om

-----Original Message----- 
From: John Andrews
Sent: Wednesday, January 22, 2014 03:51
To: Discussion of the Lowfer (US, European, &UK) and MedFer bands
Subject: Re: [Lowfer] Sampling Rate and Frequency Calibration

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.
>>
>>
>>
>> Internal Virus Database is out of date.
>> Checked by AVG - www.avg.com
>> Version: 8.5.455 / Virus Database: 271.1.1/5970 - Release Date: 07/06/13 
>> 16:46:00
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