Bill...try your loopback test using McLeod's estimator.Just replace peakup.f90
with this:
subroutine peakup(ym,y0,yp,dx)! McLeod's estimator delta =
(ym-yp)/(2*y0+ym+yp) dx=(sqrt(1+8*delta*delta)-1)/4*delta; returnend
subroutine peakup
From: Bill Somerville <g4...@classdesign.com>
To: wsjt-devel@lists.sourceforge.net
Sent: Tuesday, January 10, 2017 10:08 AM
Subject: Re: [wsjt-devel] FreqCal Mode
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. #yiv8481682119 p, #yiv8481682119 li {white-space:pre-wrap;}
#yiv8481682119 p, #yiv8481682119 li {white-space:pre-wrap;}
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