On 02/06/2020 16:41, Rik Strobbe wrote:
Hello,
while testing V2.2.0-rc1 in FT8 I get false replies after calling CQ
once in a while, eg:
153345 -17 1.1 1666 ~ OR7T I55RHO R LG23 ? a2
It seems only to happen short (1, 2 or 3 periods) after a CQ call.
I never noticed this in earlier versions.
73, Rik ON7YD - OR7T
Hi Rik,
that is expected behaviour. AP decodes are more likely to false decodes
as the message is being decoded from a smaller number of received
information bits. That particular AP mechanism, which is looking for
your callsign in the first position, is disabled automatically a few
periods after you stop calling CQ. So in summary, the a2 type AP decode
combined with the '?' low confidence marker should be considered
doubtful unless it makes sense to you as well as the decoder.
More information can be found in the WSJT-X User Guide here:
https://physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main-2.2.0.html#AP_Decoding
73
Bill
G4WJS.
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