Thanks Bill I calculated frequency differences and my conclusion is that there is no ghosts, but only AM or/and FM modulation possibly in a power amplifier due to less than perfect power supply filtering and possible overdriving so that output power follows the supply voltage variations. This is a typical modulation result, when the modulating voltage waveform is triangle with a sharp rise time. Not all modulation sidebands are strong enough to be decoded.
73, Reino From: Bill Barrett [mailto:w2pky...@gmail.com] Sent: 13. heinäkuuta 2019 21:29 To: WSJT software development <wsjt-devel@lists.sourceforge.net> Subject: Re: [wsjt-devel] FT8 ghost signals Hello Reino- 190708_224015 50.313 Rx FT8 -24 0.3 350 WC4H W4I R-13 190708_224015 50.313 Rx FT8 -12 0.3 710 WC4H W4I R-13 360 = 3 x 120 190708_224015 50.313 Rx FT8 -7 0.3 830 WC4H W4I R-13 120 190708_224015 50.313 Rx FT8 17 0.3 950 WC4H W4I R-13 120 190708_224045 50.313 Rx FT8 -24 0.3 350 WC4H W4I 73 190708_224045 50.313 Rx FT8 -14 0.3 709 WC4H W4I 73 Thanks for the tip. Here is the episode. Bill W2PKY On Sat, Jul 13, 2019 at 1:46 PM Reino Talarmo <reino.tala...@kolumbus.fi <mailto:reino.tala...@kolumbus.fi> > wrote: Bill, Do you happen to have an ALL.TXT on that situation? If so what was the frequency difference between those sub-harmonics? 73, Reino oh3ma _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net <mailto:wsjt-devel@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/wsjt-devel
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