Sam, as you very well know the User Guide talks about CAT ‘Split Operation’ or ‘Split Mode’. It is the manner how WSJT-X controls your rig. Unfortunately a short version ‘Split’ is used in discussions both in that manner and in the classical manner what is described in the User Guide in 6.8. FT8:
“To avoid QRM from competing callers, it is usually best to answer a CQ on a different frequency from that of the CQing station. The same is true when you tail-end another QSO. Choose a Tx frequency that appears to be not in use. You might want to check the box Hold Tx Freq.” Bill (sk) wanted to keep the terminology ‘Split operation’ as it is exactly what happens in the classical split working i.e. VFO frequency is changed. In any other mode outside WSJT-X the split is looked at the antenna interface, where is means a different Rx and TX frequency. Currently that mode of working is recommended in the User Guide as above. It is ‘use the Hold Tx Freq and choose a different Tx frequency that the other station is using i.e. Rx frequency’. Too many words, hi! I think that the ‘Split Operation’ is the WSJT-X terminology and word ‘split’ is not used alone. We could use e.g. ‘split working’ to separate those two usages of ‘split’. The word split is not owned in WSJT-X to cover only one specific meaning. 73, Reino OH3ma From: Saku via wsjt-devel [mailto:wsjt-devel@lists.sourceforge.net] Sent: sunnuntai 30. huhtikuuta 2023 10.25 To: wsjt-devel@lists.sourceforge.net Cc: Saku <oh...@sral.fi> 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
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