Joe, I have experimentally determined that my threshold is about -15 to -16...so seems to agree with theory.
New veision is doing well. +6 is as strong as I have seen any signal from K8R and it decoded it no problem. Tomorrow morning, if they are on 20m, that should be a good test, because they have been very strong the past 3 mornings. Congrats to you, Steve, Uwe and the rest of the team. It's a pleasure to see decode after decode, with none missing. 73, N0AN Hasan On Fri, Jul 19, 2024 at 6:38 PM Joe Taylor via wsjt-devel < wsjt-devel@lists.sourceforge.net> wrote: > Hi all, > > We know how sensitive the SuperFox mode is. Here are some details, > computed by our simulation test program for the "Mid-latitude Moderate" > channel. We used 10000 simulated transmissions for each SNR in the table. > > Code: QPC(127,50) Q:128 NDS:151 NSPS:1024 Baud:11.719 BW: 1512. > Channel: MM TxT:12.9 SyncType: 1 Iters: 10000 Depth:5 dth:0.70 > damp:1.00 > > SNR Eb/No fsync fgood wer uer rmsf rmst tdec > dB dB Hz ms s > ----------------------------------------------------------------- > -8.00 11.07 0.99990 0.99990 0.00010 0.00000 0.28 1.3 0.005 > -9.00 10.07 1.00000 1.00000 0.00000 0.00000 0.35 1.5 0.005 > -10.00 9.07 0.99940 0.99890 0.00110 0.00000 0.42 1.7 0.005 > -11.00 8.07 0.99900 0.99840 0.00160 0.00000 0.51 1.9 0.006 > -12.00 7.07 0.99750 0.99480 0.00520 0.00000 0.63 2.1 0.006 > -13.00 6.07 0.99530 0.98330 0.01670 0.00000 0.74 2.4 0.009 > -14.00 5.07 0.98880 0.92600 0.07400 0.00000 0.93 2.8 0.021 > -15.00 4.07 0.97840 0.71720 0.28280 0.00010 1.10 3.3 0.063 > -16.00 3.07 0.95490 0.24070 0.75930 0.00010 1.31 3.8 0.147 > -17.00 2.07 0.92350 0.01270 0.98730 0.00010 1.54 4.4 0.175 > -18.00 1.07 0.87330 0.00000 1.00000 0.00000 1.65 5.2 0.176 > > Threshold sensitivity (50% decoding): -15.5 dB > > You can probably figure out what the column headings mean. On this > channel, the 50% decoding threshold occurs for the SuperFox waveform at > SNR = -15.5 dB. > > If Fox operated using single-stream FT8, you could copy him most of the > time down to about -17 dB. Occasionally a little weaker, depending on > channel details. To work him when he's using a single stream, you'd > need to get in line and it might be a long wait. > > If Fox was using two or more old-style F+H streams, his signal would be > much weaker: -6 dB for two streams, -14 dB for 5 streams. > > The SuperFox signal is the same strength, independent of how many Hounds > he's working, and (on the Mid-latitude Moderate channel) the 50% > decoding threshold is -15.5 dB. > > -- 73, Joe, K1JT > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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