Hello everyone:
I got across this paper some time ago. The algorithm suggested could
perhaps be applied to FreqCal.
https://mgasior.web.cern.ch/mgasior/pap/FFT_resol_note.pdf
73, Edson PY2SDR
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On Tue, Jan 10, 2017 at 2:08 PM, Bill Somerville <g4...@classdesign.com>
wrote:
> On 09/01/2017 23:57, Joe Taylor wrote:
>
> Still, it will probably be best to put a window on the FFT.
>
> Hi Joe,
>
> the new sin^2 window function improves accuracy most of the time, here
> are some sample measurements using identical tones synthesised by another
> WSJT-X instance:
>
> 15:23:57 5000 1 1500 1500.000 0.000 -39.4 78.8
> 15:24:06 7850 1 1501 1501.022 0.022 -39.5 78.0
>
> 15:24:41 10000 1 1502 1501.979 -0.021 -39.3 78.5
>
> 15:25:06 14670 1 1503 1503.018 0.018 -39.4 78.6
>
> 15:25:34 15000 1 1505 1504.976 -0.024 -22.2 59.9
>
> 15:26:06 20000 1 1506 1506.025 0.025 -39.4 78.2
>
> 15:26:46 660 1 1507 1506.977 -0.023 -39.4 78.5
>
> 15:27:09 880 1 1508 1508.014 0.014 -39.4 78.8
>
> 15:27:36 1210 1 1509 1508.991 -0.009 -39.5 77.7
>
> 15:28:04 2500 1 1510 1509.991 -0.009 -39.1 78.5
>
> without the window:
>
> 15:48:55 660 1 1500 1500.000 0.000 2.8 77.5
>
> 15:49:09 660 1 1501 1501.010 0.010 12.6 64.1
>
> 15:49:20 660 1 1502 1501.956 -0.044 19.5 60.1
>
> 15:49:43 880 1 1503 1503.037 0.037 18.0 61.9
>
> 15:49:55 880 1 1504 1503.946 -0.054 23.4 54.1
>
> 15:50:06 1210 1 1505 1504.991 -0.009 6.5 73.8
>
> 15:50:18 1210 1 1506 1506.061 0.061 22.6 55.9
>
> 15:50:50 2500 1 1507 1506.949 -0.051 20.9 58.5
>
> 15:51:09 3330 1 1508 1508.029 0.029 16.0 64.1
>
> 15:51:20 3330 1 1509 1508.966 -0.034 23.5 53.3
>
> 15:51:39 5000 1 1510 1509.983 -0.017 11.7 68.5
>
> I note that the SNR figures are roughly the same but the "Level" column
> has changed dramatically.
>
> 73
> Bill
> G4WJS.
>
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