Hi Saku,
I know what split is in SSB and CW. I also know and understand what split means
within the WSJT-X settings and how it works.And yes, you can theoretically say
that because either using FakeIt or CAT you may actually be shifting the RF
carrier frequency up/down and lowering/raising the audio offset to stay at the
center of the band pass, the term Split may be somehow applicable, it is not in
the same vain as in SSB or CW. If I am transmitting on offset 1450, the SPLIT
option has no effect. However, if I am on offset 300, the SPLIT function
actually does change (lowers) the carrier RF and raises the Audio offset so
that it is in the somewhat in the center of the Audio bandpass. The receiving
station then sees the decoded message at offset 300.
As to randomizing the TX offset on TX1 and/or TX6 I don't see any benefit but
can see potential problems. If I am calling CQ after I find what appears to be
a clear offset on my end, I do not want WSJT-X to move it for me. If I don't
receive replies after a few moments, I will stop, and look and analyze what I
see and if need be I will move it if necessary. The same applies to TX1. That
is part of what being a HAM is.
73,
Sam W2JDB
-----Original Message-----
From: Saku via wsjt-devel <wsjt-devel@lists.sourceforge.net>
To: wsjt-devel@lists.sourceforge.net
Cc: Saku <oh...@sral.fi>
Sent: Sun, Apr 30, 2023 3:25 am
Subject: Re: [wsjt-devel] Fwd: Enhancement suggestion - 30 second cycles
Sam W2JDB via wsjt-devel kirjoitti 28.4.2023 klo 15.03:
Saku, split on WSJT-X means that WSJT-X can automatically adjust your frequency
so that your transmit audio is always somewhere within the middle of the audio
bandpass.
73,
Sam W2JDB
Hi Sam! Split, what Google translate says, means "divide by parts". And that
it is when we are talking about split in Ham radio. I.E. Transmit on other
frequency as listen, just like Reino says.
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. 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.
Better would have been to call "settings/radio/split operation" as: "Optimize
audio passband": none, using 2 vfos, adjust 1 vfo That would have been less
confusing, just like Jim says.
But that was not the subject after all.
We were talking about the benefits of having randomized frequency on TX1 and
TX6.
Reino states that using random TX could prevent neighbor station to complete
his DX qso. Well, I do not think so.
TX1 and TX6 jumping may disturb neighbor, but only one time. Next transmit is
again on different frequency. Unless the qso is established and TX locked. But
that is life. It is not worse than losing DX because band polices "trying to
keep DX frequency clear" causing most qrm by them self.
And usually very close neighbors are using same period for TX when there is
no harm at all. That is the best benefit of FT8 DXing: keeping the TX periods
organized, mostly. There always are someones that think that transmitting on
other period than others could catch DX better. Ok, now the original subject is
splitting again. Best to QRT. --
Saku
OH1KH _______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
_______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
