[ADXA] Comments from Joe Taylor about F/H and SF/SH decodes.

[WB5JJJ]

Hi all,

WSJT-related lists have recently seen a lot of discussion about FT8 and
SuperFox decoding thresholds.  Some of it has been incorrect or misleading.

I have posted a short document comparing measured sensitivities of SuperFox
and FT8 (including multi-streaming) here:
https://wsjt.sourceforge.io/SuperFox_Performance.pdf

   -- 73, Joe, K1JT

Personally, I've considered the difference between SF and F a lot with the
recent DXPeditions.

I "felt" that I needed a stronger SF signal than I did with the standard F,
but after deep thought, I came to realize that perhaps the algorithms used
to decode the different formats may be the culprit.  And yes, I too have
been decoding F/H when I see NOTHING in the waterfall.  Not so with SF/SH
as those signals need to be much stronger so I can actually hear the tones
before a -15dB is printed.  Regardless of what JT's graph shows, in MY real
world experience, there is a major difference between the two formats.

If this is so, the WSJTx team will work that out so the apparent signal
decode levels would be comparable between F/H and SF/SH.

73's
George - WB5JJJ
HoIP - 100105
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