Again I disagree. Your are not discussing the same factor that I am of
the radio changing carrier frequency as displayed with data shift
allowance already of ;
FUNC > RADIO SETTING > Mode PSK/DATA> DATA SHIFT {SSB} set 1500 HZ .
So if I see a spot at 28.079.400, I tune to 28.079.00 and sure enough I
find that target at 400Hz on the Pan display.
I TX mark 1200 Hz on pan and the SUB vfo transmits 28.078.500 (500HZ sub
vfo auto down shift controlled from wsjtx), and audio frequency is 1700HZ,
keeping the 1500 - 2000 HZ sweet spot window the split shift is designed
for.
I do not accept the radio is not changing RF frequency on TX, I do
accept it is and the software generates the appropriate audio frequency
to compensate,
which the sum becomes the frequency spotted. My explanation is the radio
condition at the radio, not the received signal elsewhere.
73
vk4tux
On 1/5/23 13:55, Jim Brown via wsjt-devel wrote:
On 4/30/2023 4:30 PM, Adrian via wsjt-devel wrote:
Reino, this is where we disagree, as my point is if the vfo frequency
changes, then the 'radio frequency' which I consider the same also
changes.
Adrian,
Reino is right, and you are wrong. Nothing personal, just scientific
fact. The frequency readout of virtually all modern transceivers set
to receive CW is radio frequency corresponding to the center of the
receive bandwidth. When a second RX set to receive CW is tuned to peak
your FT8 signal, that readout IS the center of the 50 Hz signal you
are transmitting. If your USB dial frequency is 21.074 MHz (21,074
kHz) and your offset is 1.5 kHz, the center of your signal is 25 Hz
above 21.0755 MHz (21,075.5 kHz) (25 Hz because WSJT-X defines TX
frequency as the frequency of the lowest tone).
73, Jim K9YC
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