I agree that the signal was strong, but there was another signal a little later that was also under 1000 Hz and was several dB stronger. Its fundamental was not extra wide and it did not have the associated harmonics.
The signal shown also suffered from a huge burst of white noise as the transmission started. Re: ALC not being the cause. It has been my experience working with stations to improve poor quality signals that reducing the AF drive usually fixes the ‘close in’ harmonics. > On Jun 7, 2020, at 13:55, Black Michael via wsjt-devel > <wsjt-devel@lists.sourceforge.net> wrote: > > That's actually just a very strong signal so you can see the side lobes of > the FFT that are always there but usually in the noise. > It's quite possible the harmonics you see is from your received signal > clipping given how intense that one is. > > Mike W9MDB > > > > > > On Sunday, June 7, 2020, 11:04:09 AM CDT, Bill Somerville > <g4...@classdesign.com> wrote: > > > David, > > that sort of distortion can only happen in the base band audio domain, ALC > and other RF applications can't cause close in harmonics like that. > > 73 > Bill > G4WJS. > >> On 07/06/2020 16:34, David Tiller wrote: >> To add to what Rick said, >> >> Even for radios that have a monitor function, the audio you'd get back would >> likely be 'clean' as it's probably echoed way before ALC and other >> processing have made the TX'ed signal nasty. Here's an example that I heard >> just this morning that probably would've sounded fine on the monitor, but >> look at what was transmitted: >> >> >> <Screen Shot 2020-06-07 at 10.33.16 AM copy.png> >> >> >>> On Jun 7, 2020, at 11:22 AM, Rick Drexel <rdre...@msn.com> wrote: >>> >>> Andy, >>> >>> Before starting a transmission, the Transmit / Receive relay kicks in and >>> disables the receiver section and enables the transmitter section. That >>> protects the receiver from the 1 or more watts of output generated by the >>> transmitter. The receiver section is generally designed for microwatts of >>> input. >>> >>> The Wide Graph pauses because nothing is received for processing. I've >>> thought about using a second radio but it would have to be miles away from >>> my QTH. >>> >>> 73, Rick >>> WK1P >>> >>> >>> From: Andy Durbin <a.dur...@msn.com> >>> Sent: Sunday, June 7, 2020 9:42 AM >>> To: wsjt-devel@lists.sourceforge.net <wsjt-devel@lists.sourceforge.net> >>> Subject: [wsjt-devel] Wide Graph during TX >>> >>> Wide Graph has always been frozen during TX for JT-65, JT-9, and JT65. >>> It's been that way since the earliest versions of WSJT-X, but why? >>> >>> If Wide Graph continued to run during TX it would/could allow monitoring of >>> TX audio for rigs that have that capability. Perhaps if people could see >>> the shit they are sometimes transmitting they would do something to fix >>> their signals. >>> >>> 73, >>> Andy, k3wyc > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > <Screen Shot 2020-06-07 at 10.33.16 AM copy.png> > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel
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