The obvious first places to look are the calibrations of each radio. My
K3 (always one, has the TCXO option) stays within a cycle or two and I
can 'net' it to within about a quarter cycle (using the WOW method).
Who ever answers on the tone freq I use in FT8 (actually kind of rude
because multiple callers cause a mess, use an offset) is typically
within one cycle of what I've selected, so it's not a common issue.
I'd venture proper calibration hasn't been done within that group.
If no one else has done that, your mileage WILL vary. This is the most
likely reason since phone folks tend to tolerate frequency variations
easier than other modes.
The other place is to make sure that the XIT (or second VFO) is not engaged.
Rick NHC
On 1/18/2019 8:54 AM, Richard wrote:
After working a friend on 10 meters with FT8 I phoned and asked him why he
always stayed up high at 2454 Hz. He said WSJT-X said he was dead on 2500 Hz.
I asked him what it said my frequency was. He said it was 1048 Hz; my WSJT-X
said I was dead on 1000 Hz. We did more testing at other frequencies and on
other bands and found similar discrepancies.
We involved a third station and compared three ways. The results were the same:
no agreement anywhere.
The radios were my K3s, a TS-990s, and a high-end Yaesu. All of us were using
WSJT-X 2.0.0. None of us had RIT or XIT in use.
What’s the deal? Is there a way to calibrate the software so the frequency
shown by WSJT-X is the frequency upon which we are actually transmitting or
receiving?
Please keep in mind that none of us is a Paul Horowitz, but neither are we
Gomer Pyle… somewhere in between.
Cheers.
Richard - W4KBX
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