On 01/01/16 15:47, Bill Somerville wrote: > On 01/01/2016 15:36, Barry Jackson wrote: >> Not sure if this is related, but I am testing 6330 in WSPR mode and I am >> seeing triple decodes of strong signals the main one and then two others >> at approx +/-30Hz about 25dB down e.g.: >> >> 1504 -21 -0.9 7.040038 0 DF2JP JO31 30 417 >> 1504 7 -0.9 7.040070 1 DF2JP JO31 30 417 >> 1504 -19 -0.9 7.040101 -1 DF2JP JO31 30 417 >> >> I appreciate that this may be due to my settings, but I don't recall >> seeing this with 1.6.0 and kvasd. >> >> Maybe this decoder is hearing sprogs that the old one could not detect ;) >> >> Barry > > Hi Barry, > > WSPR mode in the WSJT-X development branch is virtually unchanged from > the v1.6.0 GA release. Also KVASD has no bearing on WSPR decodes. > > Multiple decodes are invariably due to spurious mixing products either > at the Tx station or the receiving station in the baseband audio domain > i.e. not related to software. Given that your case reports DF2JP spurii > down by >30dB below his main signal; I would not worry too much. The > ~31Hz spacings are unusual, more commonly 2*local line frequency mixing > products (100Hz/120Hz) are far more prevalent due to PSU ground return > issues. > > 73 & HNY > Bill > G4WJS. > > ------------------------------------------------------------------------------ > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > Hi Bill, Thanks for the explanation, and a Happy New Year to you too!
Barry G4MKT ------------------------------------------------------------------------------ _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
