I disagree with below.
Sam explained it well. Keeping the same Pan TX location the RF frequency
is shifted to maintain and audio frequency suitable for the best
passband performance and level
continuity. It is split. The TX VFO adjust to 500, 1000 below the RX RX
VFO frequency when pan TX marker is set ~ 500 or 1000 below the mid
mark. and opposit when set above so the TX vfo raises frequency 500, 100
Hz and so on. The same effect of changing frequency changing the pitch
of a received voice/signal is the same effect used to get the audio
frequency in the sweetspot while maintaining pan position for stations
listening. Any frequency shift between TX and RX is split operation.
Fake (split) is changing the same (TX/RX) vfo frequency between TX and
RX for the same effect.
vk4tux
When using sideband modulation (USB/LSB) the RF frequency is tied to
audio slot frequency. That is: dumped RF carrier +/- audio frequency
depending on sideband used. If we change audio slot we change RF
frequency that means we are using "split" in means what is in Ham radio.
No it means you are altering audio frequency in line with the pan
marker, carrier point frequency remains the same, and unless it is
forced to shift then audio passband become an issue.
Using the thoughtlessly named "split operation" of
wsjt-x/settings/radio has NO effect to RF frequency that is produced.
It is always the same as "split operation", when used, adjusts the
ratio of RF carrier to audio frequency to keep the produced RF
frequency always the same while centering the audio frequency in
middle of AF filter passband.
Rubbish, The split operation shifts RF frequency on TX vfo in 500Hz
increments to suit the audio marker more than 500Hz off center.
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