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
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