Re: [wsjt-devel] Enforcing WSJT-X split mode

[John K. <joh...@gm...>]

Lance,

Yes, as I said I recall that as the reason to stay above 1500 Hz.  I just
don't see how rig split or fake it solves the problem.  Or is it that
regardless of your DF, either of those modes *always* places you above 1500
Hz?

John

On Mon, Oct 13, 2025 at 12:45 PM Lance Collister, W7GJ via wsjt-devel <
wsj...@li...> wrote:

> Hi John,
>
> It IS important not to overdrive your audio stage, but that is not the
> biggest issue.
> The problem arises if the audio signals actually transmitted by the
> computer are
> under 1500 Hz...in that case, the audio harmonics can be passed through
> the filter in
> the transmitter and broadcast all across the spectrum.
>
> Before he passed away, W9MDB explained this on his website:
>
>
> https://www.dropbox.com/scl/fi/avq8nt3higd3evutjssv4/FT8Noise8.pdf?rlkey=xgfxw0bmtdik23h1psu7khz38&e=1&dl=0
>
> GL and VY 73, Lance
>
> On 10/13/2025 18:50:14, John Kludt via wsjt-devel wrote:
> > Guys,
> >
> > I thought this all started with an observation that some people hit it
> way too hard
> > and generate unwanted harmonics.  I have always thought the "cure" for
> that was to
> > turn down the audio feed.  It is not clear to me how using rig split or
> Fake It
> > solves that problem.  I always use Fake it - have for literally years.
> I thought
> > either method ,Rig Split or Fake It, was about keeping your signal more
> or less in
> > the center of the bandpass.   I do recall advice somewhere to run higher
> in the
> > bandpass rather than lower in the bandpass to move unwanted signals out
> of the
> > bandpass - is that why you all are discussing Fake It versus Rig Split?
> Isn't the
> > better answer to make sure you have a clean signal and in some cases
> maybe turn
> > down the power just a little bit?
> >
> > Just curious what I am missing.
> >
> > John K7SYS
> >
> > On Sun, Oct 12, 2025 at 11:57 PM Reino Talarmo via wsjt-devel
> > <wsj...@li...> wrote:
> >
> >     Hi Andy,
> >
> >     Your statement ‘Testing fake-it requires a transmission but rig
> split does
> >     not.’ without additional information makes no sense to me. Do you
> mean how an
> >     operator can see that he is transmitting at correct radio frequency?
> Most
> >     radios indicate the used VFO frequency, when commanded for
> transmission. In the
> >     fake-it operation the RX VFO (A) frequency changes and in the rig the
> >     transmission uses the TX VFO (B). For an indication both require a
> rig
> >     transmission activation.
> >
> >     If the Tune button is used for the activation, then there is output
> power in
> >     both cases. If the Test Cat button or the Test PTT button is used,
> then no
> >     audio will be transmitted, and no RF output will be sent. (If PTT
> method VOX is
> >     used, then the Test PTT don’t work and only the Tune button can be
> used.)
> >
> >     The change of the audio frequency is not presented to the user.
> >
> >     It would be much easier to help in the rig split operation, if at
> least you
> >     tell us the rig type and how CAT control is arranged.
> >
> >     73, Reino OH3mA
> >
> >     *From:*Andy Durbin via wsjt-devel <wsj...@li...>
> >     *Sent:* Monday, October 13, 2025 12:24 AM
> >     *To:* WSJT software development <wsj...@li...>
> >     *Cc:* Andy Durbin <a.d...@ms...>
> >     *Subject:* Re: [wsjt-devel] Enforcing WSJT-X split mode
> >
> >     "I provided a signal report with screen shots to one offending
> station and he
> >     improved his signal with audio drive adjustment.  He stated he was
> using rig
> >     split."
> >
> >     Correction - He stated he was using fake-it.  Testing fake-it
> requires a
> >     transmission but rig split does not.
> >
> >     Andy, k3wyc
> >
> >     _______________________________________________
> >     wsjt-devel mailing list
> >     wsj...@li...
> >     https://lists.sourceforge.net/lists/listinfo/wsjt-devel
> >
> >
> >
> > _______________________________________________
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> --
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