Thank you Bill. That makes sense. I read the manual cover to cover, but I didn’t correlate everything for AP. I will read it again, more closely.
I was a CIO/CSO for many years, specializing in DoD security and encryption. I’m fascinated by FT8. Thank you and the team for the responses. 73 de W8NET Gene 3905 Century Club Master #47 Portage County Amateur Radio Service (PCARS) since 2008 ARRL A-1 Op > On Mar 30, 2018, at 11:36 AM, Bill Somerville <g4...@classdesign.com> wrote: > >> On 30/03/2018 15:44, Gene Marsh wrote: >> At first, I thought someone was pranking me. Then, I saw it BEFORE I had >> transmitted. In my example, I had not been on for 3 days. >> >> I work FT8 approximately 10 hours a week, and approximately 10 hours of >> standing by on the program and radio. In that time, 5-6 instances occur. >> 50% were good call signs, 50% were bogus. ALL were properly formed and >> legitimate grid coords (but some were in the middle of nowhere). >> >> If you know the issue, please email me! Maybe I’m going crazy! > > Hi Gene, > > you have "Menu->Decode->Enable AP" checked. Please read this section of the > WSJT-X User Guide: > > http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main-1.8.0.html#_ap_decoding > > A priori decoding assumes parts of the candidate incoming messages using > information already known and tries to construct messages containing that > information. WSJT-X assumes you are waiting for CQ replies when you are not > in a QSO (DX Call cleared) so it assumes your callsign might be part of an > incoming message. If it can pull out a plausible message with a valid > checksum after making that assumption it will show a decode. It also tags > that decode to show it was obtained using AP information by appending a > marker, in this case 'a2', it may also append a '?' if the decode is marginal > even using AP. > > If you make your WSJT-X main window a little wider you will see these > appended markers (note the scroll bar at the bottom of the window). Of course > you could also disable AP decoding but you would lose around 1.5% of useful > decodes, that may not sound much but those 1.5% are the most interesting > decodes, i.e. stations calling you. > > WSJT-X v1.9 will stop considering AP type 2 decodes a few decodes after you > stop calling, this should reduce the already low rate of false AP type 2 > decodes to a very small one. > > 73 > Bill > G4WJS. > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
