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Working Split with WSJT-x

Bob Lewis (AA4PB) on August 20, 2017
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Working Split with WSJT-x

By AA4PB

We usually think of “working split” as receiving on one frequency and transmitting on another. With WSJT-x however, working split means calling CQ on one frequency (the calling frequency) and completing the entire QSO exchange on a different frequency (the working frequency). If the calling frequency is not too busy, we can complete the entire QSO there without too much problem. When it gets busy however, it can really slow down the QSO exchange, often taking many tries to get each exchange through. During the busy times working split can offer a big advantage as the QSO exchange takes place on a different, less used frequency.

Let us assume that we are working MSK144 on 6 Meters. The standard calling frequency is 50.280 MHz and we choose to use a working frequency of 50.260 MHz. Here is how we would set up split operation with WSJT-x:

· Check the TXCQ box on the main screen and set the number to TXCQ: 280. This is the calling frequency where your CQ will occur.

· Tune the transceiver VFO to 50.260 Mhz. This is the working frequency where you want to have the QSO exchange.

· When you call CQ, the transceiver will automatically QSY to 50.280 MHz before beginning the transmission.

· Your CQ transmission will include “260” to indicate that you want your CQ to be answered on 50.260 MHz.

· When the answering station clicks on your call (containing the “260”), his transceiver will automatically QSY to 50.260 MHz for the QSO. After the QSO is completed he will have to manually retune his transceiver to the 50.280 MHz calling frequency. Note: Programming the calling frequency into the WSJT-x frequency list will make it easy to return with a mouse click.

· Your transceiver will remain on the 50.260 MHz working frequency until your next CQ call.

Member Comments:
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Working Split with WSJT-x Reply
by VK3BL on August 20, 2017 Mail this to a friend!
The new FT8 mode has a feature called 'Answer First', and will automatically QSY to the first decode to your CQ if needed.

Its absolutely fantastic, and I think it will revolutionise JT Modes.

The other feature I like is that if you call a Rare DX Station off frequency, and they don't QSY to yours to keep 'their' frequency, FT8 will automatically QSY to their frequency if they call you!

FT8 has such great potential; finally a JT mode that is suitable for DXPeditions, especially low budget ones.

The trade off is of course sensitivity; with ~-18 being the reliable decode threshold. On the other hand, because QSOs take 1/4 of the time, you can make contacts before QSB sets in!

Its a game changer, and I plan on using it extensively on my next Holiday DXPedition, slated to be Fiji 3D2 in 2018.

On the trip I will be taking an Icon IC-7200, LDG AT-600 ProII & THP HL-450B.

Bands will likely be 20 & 40M, and digital modes used extensively. A 12M Spiderbeam pole will be taken, with G5RV and Vertical operation possible.

If your a little pistol, need 3D2 and digital modes are you go to, make sure you get FT8 capable and feel free to send me an email when the DXPedition is announced on DXNews for a sked :)

73,
Jarrad VK3BL
 
RE: Working Split with WSJT-x Reply
by AA4PB on August 20, 2017 Mail this to a friend!
FT8 has been released since this article was written and I agree that FT8 changes everything.
 
D'uh…? Reply
by VE3CUI on August 21, 2017 Mail this to a friend!
Gee, but I must be a low-tech, dumbed-down, pre-historic Hamosaurus here…I think that I already HAVE this feature/operation in my station & equipment, & that I've been using it for YEARS now, too…

Only I call it "R.I.T.," or, "receiver incremental tuning."

Go figure. You learn something new every day!
 
RE: Working Split with WSJT-x Reply
by VK3BL on August 21, 2017 Mail this to a friend!
Bob, I know how you feel re: articles taking ages to get published; I do hope you didn't take my comments as criticism.

If you want to work a rare one using JT65, replying split is a must if you've only got a vertical and 100 watts.

As for the other comment... well there is always one...
 
RE: Working Split with WSJT-x Reply
by AA4PB on August 21, 2017 Mail this to a friend!
No problem, Jarrad. I was working MSK144 on 6M and found split to be helpful at times when there was lots of activity. Of course now most activity is FT8. Things change fast now days.
 
RE: D'uh…? Reply
by K0UA on August 21, 2017 Mail this to a friend!
Gee, but I must be a low-tech, dumbed-down, pre-historic Hamosaurus here…I think that I already HAVE this feature/operation in my station & equipment, & that I've been using it for YEARS now, too…

Only I call it "R.I.T.," or, "receiver incremental tuning."

Go figure. You learn something new every day!


I bet you don't work WSJT modes at all. or you would not have replied in this manner. "better to remain silent......."
 
K0UA Reply
by VE3CUI on August 21, 2017 Mail this to a friend!
I said it first, though, didn't I…?

I'm just a low-tech pre-historic dinosaur here --- take it in any way you might care to, as I'm afraid that I could care less, silence, or no silence…

Eddy
 
RE: D'uh…? Reply
by K9MHZ on August 22, 2017 Mail this to a friend!
by VE3CUI on August 21, 2017.."Gee, but I must be a low-tech, dumbed-down, pre-historic Hamosaurus here…I think that I already HAVE this feature/operation in my station & equipment, & that I've been using it for YEARS now, too…"


Another "Gee..." post, great. Worn out and condescending.
 
D'uh! Reply
by VE3CUI on August 22, 2017 Mail this to a friend!
by K9MHZ on August 22, 2017…"Another 'Gee...' post, great. Worn out and condescending."

Another unyielding, blowhard, pontificating insult instinctively hurled within the protective confines of the internet. How atypical and symptomatic of the ails and travails of the very country of its origin.

 
RE: D'uh! Reply
by K9MHZ on August 22, 2017 Mail this to a friend!
You're boring, Canuck.

Don't you have some tubes to play with?
 
K9MHZ Reply
by VE3CUI on August 22, 2017 Mail this to a friend!
Do you even know what tubes ARE…?

I mean, beyond what you may have seen once in "The Golden Book" encyclopedia for pre-pubescent bullies...
 
RE: K9MHZ Reply
by K9MHZ on August 22, 2017 Mail this to a friend!
by VE3CUI on August 22, 2017 "Do you even know what tubes ARE…?"

Uh, yeah....unfortunately that's all we had years ago. Also know they're nothing but a simple novelty today, and that's being kind. Sorry, but I think you rolled in on this thread with that stupid remark that had nothing to do with this topic. I'm sure all the Americans appreciated your other comment as well. Way to go. Funny how people hate what they evny.
 
Envy…?! Reply
by VE3CUI on August 22, 2017 Mail this to a friend!
Yeah, K9MHZ, I sure am envious --- as are doubtlessly ALL Canadians --- of your country's lack of universal health care, irrelevant political leadership, dysfunctional social services, subservience to Chinese (and now Russian) domination, etc. etc. etc.

Yes, I may know a bit about TUBES, alright --- but I admit to having absolutely no clue whatsoever as to what food stamps are, the 2nd amendment, and all those other cherished "values" that people of your ilk seem to hold so very near & dear to their bosuns, at the cost of most everything else.…

Yup --- my jealously betrays me…but enough of this nonsense: let's all just go back to simply bashing one another across international borders for our ignorance on the latest & greatest trends & fads in Ham radio, & leave the politics OUT of the equation, OK…? I'm big enough to let it all pass --- are you…?
 
RE: Envy…?! Reply
by K9MHZ on August 22, 2017 Mail this to a friend!
Ha, oh man. You really are a piece of work.

So sorry to everyone else. I'm done with this moron.

 
RE: Envy…?! Reply
by K0UA on August 22, 2017 Mail this to a friend!
To VE3CUI, Tell you what. Why don't you bring some of your famous Canadian beer down with you and come on down to my place and we will shoot some of my pistols, and when we are done and they are put away, we will drink some of your beer. How about that for burying the hatchet and showing some good will. 73 James K0UA
 
Working Split with WSJT-x Reply
by W1XWX on August 23, 2017 Mail this to a friend!
Thanks for the good article. 73
 
RE: Working Split with WSJT-x Reply
by N1KDO on August 24, 2017 Mail this to a friend!
Split is a must for FT8, because right now it can only decode one signal on the RX frequency. If two stations answer your CQ, and they are both equally strong, nothing decodes. Nada. It works great as long as there are not a lot of stations calling, or the band is not that busy (think 6m...)

JT65 can decode more than one caller on the same frequency through some mathematical wizardry ("signal subtraction") so IMHO it is better on a busy band.

The WSJT-X release notes state that the dev team is working on the signal subtraction to allow multiple callers on the same frequency.

 
RE: Working Split with WSJT-x Reply
by K3FHP on August 25, 2017 Mail this to a friend!
So THAT'S why you guys from down under have such strong signals on JT modes. I normally use no more than 5W and feel like a war criminal when I go to 20 to snag a qso. I'm just a qrp'er at heart I guess.

72 es dx to ua

K3FHP, Dave
 
RE: Working Split with WSJT-x Reply
by ND6M on August 29, 2017 Mail this to a friend!
The term "split" doesn't even apply to the way it is actually being used on WSJT.
 
RE: Working Split with WSJT-x Reply
by AA2UK on September 5, 2017 Mail this to a friend!
MSK144 supports numerous Q's on the same frequency as long as stations local remain on the same timing sequence.
FT8 decodes the entire passband like JT65.
FT8 is great for lite to strong E's and extended tropo.
FT8 compliments MSK144, however FT8 doesn't work with meteors. If you want to run meteors MSK144 is the mode.
73, de AA2UK
 
RE: Working Split with WSJT-x Reply
by AA2UK on September 7, 2017 Mail this to a friend!
Signal subtraction or the ability to decode more than 1 station on the same frequency has been added to FT8 with the latest public release if WSJTX. The release is v1.8.0-rc2 r8069. It can be found on the WSJTX webpage. Also contest mode has been added for FT8 and MSK144.
73, de Bill AA2UK
 
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