It's important to remind ourselves now and then of the benefits of the
work of the dev team on fake-it or real split in preventing the awful
signals that used to be common. All of those horrors with 2,3,4 and even
5 in-band copies of the harmonics of signals at low audio base tones,
created by folks who don't understand about the basics of setting audio
drive levels.
Also it's now thankfully rare to see signals with missing low or high
tones from audio roll-off because folks are unaware of the frequencies
they are trying to push through their legacy radios because of the usage
of automagical split in wsjt-x.
A huge vote of thanks to the dev team for handling all of the edge cases
and the legacy issues of historic radios, so folks without such
refinements as flat passbands, 48 kHz or greater audio bandwidth and 1
Hz frequency steps that even work during a transmission, can still use
their radios. Must be challenging work! Thanks folks.
As for a "sweet spot", anywhere from more than half the frequency where
the phase/amplitude rolloff begins *should* be fine. If your high tones
are being reduced by the time they reach 1900 Hz, there is something
very odd going on. I'd disable split and send some fixed tones like
@1000, @1500, @2000 or whatever to see what power the radio produces.
Almost any SSB transmitter should be reasonably flat and phase-linear up
to 2 kHz even with a rolloff at 2700 Hz. Is there any weird filtering in
the data mode perhaps? Something designed for RTTY or 1200 baud packet
perhaps? Sending specific tones without split should be a good
diagnostic approach. Good luck!
--
Neil G4DBN
https://youtube.com/MachiningandMicrowaves
On 06/07/2024 18:57, Black Michael via wsjt-devel wrote:
Some rigs have 100Hz resolution for example.
500Hz is guaranteed to work on pretty much all rigs.
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