On 09/09/2017 22:54, Rich - K1HTV wrote:
unexpected OF10, OF11, OE39, OE39 initial FT8 exchanges some stations
(you, K3AJ, N2NT, W3IP, WA3VNV) were sending.
Hi Rich,
these are the actual grids embedded in the contest mode exchanges. The
contest mode as is has been hacked into the existing protocol by using a
trick of antipodal grids to indicate contest mode grid reports. We
realize that this is less than satisfactory but there is insufficient
wriggle room in the existing 72-bt codeword to do anything better. This
does mean that attempts to QSO between those using NA contest mode and
others not is not going to make sense. For the same reasons we cannot
easily detect that a contest mode report is being received unless you
are already in contest mode, the converse is ok because we can assume
you will not work someone on the other side of the planet in NA only
contest.
F8 adds three extra bits (75-bit payload) and that will probably allow
us to design something much more robust for some contests but we are not
there yet. This doesn't directly help with MSK144 which is another good
choice for contests so we may have to break the MSK144 protocol at some
point if the same 75-bit payload and extra protocol messages is to be
used there, not something we would do lightly.
So not much help to you although you can translate those grid squares
back to what was typed in by adding 180 degrees modulo 360 to their lat
and long.
73
Bill
G4WJS.
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