You misunderstand how split works with WSJT-X. It's not like the split you're
used to on other modes.Technically, it is "split" as two your transmit/receive
are different.
But nobody even knows you're doing split but you. WSJT-X adjusts the audio on
the carrier to stay at your offset.
So....e.g.
14076 when you have offset 1200 would normally generate tones starting at
1200Hz.But turn on split and 14076 will become 14075.5 and the tones will
generated at 1700Hz to maintain the same offset to everybody receiving you.
So your transmitted signal looks no different to the outside world.
de Mike W9MDB
From: George J Molnar <geo...@molnar.com>
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Sent: Friday, June 30, 2017 9:23 AM
Subject: Re: [wsjt-devel] FT8 - build 7752 and rig control
Good morning/afternoon, Bill.
Don’t think anything is going wrong. Clearly, it’s working the way it’s written.
My concern is that, in a crowded band situation, as stations spread out, having
the software automatically “split” TX and RX in the name of spectral purity
could lead to unintended interference to stations operating perhaps several
hundred Hertz away. In an environment where there’s only one QSO in progress,
this is pretty much a non-issue, but when the passband fills, working with
non-identical TX and RX tones might lead to an effective 2-times congestion.
Practice appears to be in most circles (particularly on HF) for both stations
to use the same DF. That seems to be what most people expect. Calling off DF
can lead to click-chasing where stations ping each other around the passband,
leading to even more confusion.
Again, not saying this is the fault of the software, and keeping the tones
clean and well-centered is a good thing. Just don’t think it will work well for
the average operator under normal circumstances. I’d vote for the software not
to automatically make changes to operator settings like DF, etc.
Thanks for all the amazing work you guys are doing….
73 Geo
George J MolnarNevada, USA
KF2T @GJMolnar
On Jun 30, 2017, at 7:08 AM, Bill Somerville <g4...@classdesign.com> wrote:
Hi George,
please explain in detail what you think is going wrong? The behaviour Erik
described is normal and correct behaviour and allows you to transmit at *any*
DF plus it helps to keep your transmit signal as clean as possible.
73
Bill
G4WJS.
On 30/06/2017 14:12, George J Molnar wrote:
I see the same, and suggest it not be continued as the normal behavior. In a
multi signal environment, it will likely lead to confusion.
Using a configuration for FT8 that turns off split capability is a workaround
for now, it seems.
George J Molnar, KF2T Nevada, USA
On Jun 30, 2017, at 2:01 AM, Bill Somerville <g4...@classdesign.com> wrote:
On 30/06/2017 08:18, Erik Icket wrote:
I successfully operate latest build 7752, and in the last 12 hours, I was able
to copy on 14079 the following stations : OE1MWW, F1ABL, CT1FBK, I3VJW,
KB3MOW, AK1P, VA3VF, K9AN, K4DET, WB4KDI There is however one anomaly with
my rig control (ICOM 7100 in SPLIT mode) : When I PTT with an RX frequency of
14.079.000, the TX occurs on 14.078.500Note that the TX and RX spinners are on
1200 Hz as well as the green and red brackets on the wide graph.The same
happens on any other band (6m ..), whereby the TX is 500 Hz below the RX
frequency Has anyone else observed this ?
Hi Erik,this is normal and correct behaviour if you have
"Settings->Radio->Split Operating" set and have selected a Tx DF between 1000Hz
and 1499Hz. Other Tx DF values will select different Tx dial frequencies to
optimize your signal quality and Tx sub-band coverage.73
Bill
G4WJS.
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