Bill,
I'm currently trying to capture some examples where the WSJT-X waterfall
appears to become corrupt with multiple images of signals, along with
multiple decodes - I see this fairly frequently when using FT8, and have
also seen it very rarely with JT65, including on older versions of
WSJT-X (e.g. the 1.7 release).
It's somehow related to something that happens between TX and RX periods
- i.e. it doesn't happen at all if TX is never enabled. That would
possibly explain why I see it more often with FT8, where RX/TX
transitions are much more frequent. Sometimes it "sticks" in its
corrupted state and sometimes it clears after a random number of periods
(but may just as easily come back again, etc). It *always* clears if the
s/w is restarted, and is absolutely an artifact - i.e. it is not "bad
signals".
I assumed it was some oddity in my setup that I would just have to put
up with, perhaps the fact that I'm using a second, external usb
soundcard for the radio. However, I'm seeing reports from other users on
the kst chats of the same thing so perhaps there's more to this than
meets the eye?
Mark
On 23/07/2017 13:49, Bill Somerville wrote:
On 23/07/2017 13:35, Costantino Cerrotta wrote:
I'm wondering why on JT65 I don't receive this spurious signals..
I have two ferrite clip onto the audio cables from the radio, but
maybe I need to put also at rear of PC or elsewhere.
I'm sure that when I find big signals, quite always there are spurs
on FT8: but this don't change my positive judge to this new mode,
that makes faster qsos.
Hi Costy,
you original screen capture shows two stations with spurii down only
13 dB on their main signal, it is unlikely that two separate stations
have such poor output (not impossible but unlikely). I suspect he
problem is in your audio interface between rig and PC. It is also
likely that if the problem is at your end then you will be
transmitting a signal including spurii at around the same level.
73
Bill
G4WJS.
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