Hello Bill,
thanks for the explanation, I thought that it was something like that. In most cases the call is "special" (as in the example) and the call / grid combination doesn't make sense. And even in the unlikely case that it is a meaningfull call /grid combination, I won't get any further response after replying (I assume:-). So at worst it can fool me for a moment, but never lead to a fake QSO. 73, Rik ON7YD ________________________________ Van: Bill Somerville <g4...@classdesign.com> Verzonden: dinsdag 2 juni 2020 18:13 Aan: wsjt-devel@lists.sourceforge.net Onderwerp: Re: [wsjt-devel] WSJT-X 2.2.0 GA release 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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