Hi Claude. I think Mike´s interpretation is correct. Third harmonics are often stronger than the 2nd, and the variation in signal strength does seem to match the fundamental (which, BTW, is not the TX/RX selected DF).
I see this quite frequently. A lot of hay is made on the Facebook group and elsewhere about it being some obscure digital mode, but the simplest solution is almost certainly right in this case. 73, George/KF2T > On Jul 31, 2018, at 11:07 AM, Claude Frantz <claude.fra...@bayern-mail.de> > wrote: > > On 07/31/2018 04:38 PM, Black Michael via wsjt-devel wrote: > > Hi Mike & All, > >> The signals look clean but they are the result of clipping the signal >> due to overdriving the audio. > >> Like this one...3rd harmonic at 2830 or so...offending signal at 940 or >> so... > > OK ! We can suspect a clipping, in the audio range, resulting in this > signal at 2830 Hz. But there is no 2nd harmonic at 1880 Hz on this > waterfall. Of course, such a clipping resulting only in odd harmonics is > possible, but it would be surprising to me. Further, the starting time > of this "3th harmonic" is not consistent with the fundamental signal. > > Best wishes, > Claude (DJ0OT) > > ------------------------------------------------------------------------------ > 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
