On 18/12/2019 12:13, John Kludt wrote:
Zeev,
I don't really understand your point - why are you setting the rig for
spilt operation? I sometimes worry that the use of the word "split"
immediately brings to mind the "Up 1 KHz" CW mindset. I work FT8
"spilt" all the time but I never ever put the radio itself in "Split"
mode. All "split" means in FT8 is that you are transmitting on a
different /audio/ frequency than the one on which your are receiving.
And that does not involve VFO-B or invoking the "Split" option /on the
radio./
The word "split" in FT8 means the same thing as in CW or SSB in that
you are transmitting on a frequency different from that on which you
are receiving. But having said that, the means to achieve that
"split" are completely different.between FT8 and CW or SSB.
Maybe I am missing something. Please help me understand why I would
want to physically place the radio in "split" when running FT8
Johnny
Johnny,
yes you are missing something. WSJT-X utilizes SPLIT mode on your rig to
optimize the transmitted signal. It allows WSJT-X to adjust the Tx audio
tones to always lie between 1500 Hz and 1999 Hz, whatever your chosen Tx
audio offset. This has several benefits including squashing any
undesirable audio harmonics by placing them above the LPF cutoff of your
rig's SSB Tx IF filter, and allowing any Tx audio offset to be used
without restriction by your rig's SSB Tx IF filter pass band.
If your rig does not support SPLIT reliably using CAT control then
WSJT-X offers an alternative which adjusts the rig's VFO dial frequency
just before and after transmission periods to emulate what SPLIT would
do. This is referred to as "Fake It" split operating on the WSJT-X
"Settings->Radio->Split Operating" panel.
73
Bill
G4WJS.
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