WSJT-X Split Operation and Why Use It

K0PIR

I'm an Amateur Radio enthusiast. I love the hobby and experimenting with radios, antennas and software. On my YouTube channel I upload videos on the Icom 7300 and Icom 7610 along with Ham radio software programs. I hope to inspire people to try new things in Amateur Radio.

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Steve
4 years ago

Rich
Doesn’t using split tie up twice as much band width??
The FT8 band portion is already crowded most times
Steve
KK6NTL

Guest
Earl Palmer, N7EP
4 years ago

I am very impressed with FT-8 and us it a lot. However, I don’t like using split with FT-8 for the following reasons.

1. When using split the required bandwidth is doubled. When not using split both sending and receiving stations use the same frequency and 50 Hz bandwidth. When using split each station is using 50 Hz for a total bandwidth of 100 Hz.

2. Split causes interference. A station calling CQ picks a clear frequency and the answering station blindly picks a different frequency that may not be clear for the calling station. This creates the possibility of interference to other stations on those frequencies. This often occurs when a desired DX station calling CQ is simultaneously called by multiple stations.

When the band isn’t busy, split works fine. When it is very busy split doesn’t work well, creates interference and uses double or more of the bandwidth.

FT-8 is amazing. I have called CQ and then simultaneously copied and worked 2 or more stations answering on the same frequency.

It will be interesting to see how FT-8 works out on field day. My guess is that if propagation is good the existing 20 Meter 3 KHz FT-8 window will expand to about 13 KHz or more, perhaps from 14.070 to 14.083 MHz.

Earl, N7EP

Guest
Ray Lewis
4 years ago

Rich, I have found that with the 7300, if you use “rig” for the split and you change the band you are operating on, as an example 40 meters to 30 meters, your receiver changes to the frequency that is that your switch to automatically with WSJT-X, but your second VFO does not change frequency on the transmit. The 7300 will try to transmit on 40 meters when you change to 30 meters for receive. Do not have my 7610 set up for WSJT so I do not know if it does the same or not. When you check the “fake it” box, the 7300 switches both transmit and receive correctly. 73, Ray AA4EZ

Guest
Guy G4DWV
4 years ago

Hi Rich,

Thanks for a nice article as always.

I always work split and ALWAYS call the DX off his channel. I have had astounding success with this and am surprised that you have not. Okay, I may have to call for over 10 mins, but I invariably snag ’em. I have also started to stop sending the line with my locator. It makes for much quicker QSOs.

73 de Guy G4DWV 4X1LT

Guest
Deryl, wb4qiz
4 years ago

Rich,

I am using the Icom 7300, HRD, and WSJT-X with FT8. Audio with Codec, I have followed your instructions with the one USB cable. I get a green signal when I press the button and red with PTT. My problem is I get little power output. I followed all the internal radio connections on the 7300. I am getting signals coming in. I can call CQ and still very little power output. I have the pwr set at 100 watts on the radio and trying to control the slider on the software cannot make the power go higher.

73,

Deryl, WB4QIZ

Guest
Deryl
4 years ago

I did what you said above: however, the radio jumps out of the USB-D when transmitting to USB on 14.074

I am using the 7300, on the WSJT-X, on settings, the Radio: Rig is Ham Radio Deluxe, Network server is blank, Mode: I have tried all three, None, USB, and Data/pkt, and the rig jumps out of USB-D to USB when transmitting or when it stops transmitting, it jumps out of USB-D to USB.

Any suggestions?

Thanks you for all you help.

Deryl, WB4QIZ

Guest
John Foster
3 years ago
Reply to  Deryl

Did you get a solution on this? I have the exact same problem.

Best Regards!
John, KI4PSV

Guest
Bob Edge
4 years ago

Hi Rich . Having trouble getting a copy of Ham radio deluxe to match my Icom 7300 ,There are no old copies ,just new available, Are Canadians cut off? Tnx for the great job you are doing, Bob VA3RE

Guest
Deryl, WB4QIZ
4 years ago

Thanks for all your help, Rich. I have done everything you suggested, and I am unable to make WSJT-X work correctly. I get one thing working, and another thing messes up. I have tried v. 7, 8, 9 and still, something is not quite right. The latest problem is switching out of USB-D goes out to USB when it stops transmitting. I have tried many different ways. I have probably spent 20+ hours trying to make it work.

Thanks for all your effort. I am not one to give up, but, I am tired of trying.

73

Deryl, WB4QIZ

Guest
Brad
4 years ago

I have been using Rig with my 7610 and notied when it is time to transmit, the radio seems to start, resets and starts again and continues. I can hear the relays click twice. I will try fake it and see what happens. Enjoyed the conversation about split mode. It will make me a better operator. Going to use Hold Transmit.

I sure wish we could post picture here at your website.

Brad
N6GR

Guest
Bill, W9LR
4 years ago

Hi Rich,
I have 7610, WSJT JT alert. Works ok but VFO changes from USB-DATA to USB by itself sometimes. Any ideas?

Bil w9LR

Guest
Rich
1 year ago
Reply to  K0PIR

What I found happening with my IC-7300, when setting Rig to IC-7300 and using split & “Rig” in WSJT-X was that WSJT-X does *not* tell VFO-B to go into USB-D. I had to manually set VFO-B to USB-D.

So I decided to just go with “Fake It” instead. It does everything “Rig” does and I don’t have to worry about forgetting to set up VFO-B properly.

Callsign
K1THE
Guest
Edmundo CE2EC
3 years ago

Hi Rick

Thank you very much for your blog and even for the time you spend.

I am reading (Google translator) this part that interests me about how to understand.

But is it possible that you have some video?

I will appreciate your response.

73 Edmundo Ce2EC

Guest
Edmundo CE2EC
3 years ago
Reply to  K0PIR

Thanks Rick for your answer,

I hope you have time and make the video.

Edmundo, CE2EC

Guest
Sergey
3 years ago

Hello! Tell me how to set up WSJT-X to work simultaneously with two, with three stations ???

Guest
Paul W5PGR
3 years ago

Every time I seem to have a problem your channel or page has the answer. I was playing around with the radio and changed it to rig. It seemed to work ok and then in FT8 when the feq split on transmit the entire display would flicker or distort for a fraction of a second. I couldn’t figure it out and moving back to Fake it fixed it.

Thanks

Guest
Ed Dugo
2 years ago

Hi; i am new to both Ham Radio and Ft-8. Right now I am using WSJT-X on Linux and a Yaesu FT 450D. None is checked under split operation. I find that I do not have to move my Tx frequency on the 450D for qso’s on any band in FT-8 and it works fine. The problem I have is all my contacts are recorded as “wrong band”. The WSJT-X program saves them on the band actually worked, but the receiving station is receiving on a different band. Will that change if I check “fake it’

Guest
Ed Dugo
2 years ago

What I do is leave my 450D on 17 meters (18.100) and just change bands on the wsjt-x software. It works, but as I said above, I get wrong band errors coming back on station logs (QRZ, LotW, EQSL) from other stations.

Guest
Ed Dugo
2 years ago

I have flrig software to do rig control. I guess that isn’t working properly as the display on the radio doesn’t change and match the display on flrig. I guess I will have to work on that. thank you for your reply.

Guest
Ed Dugo
2 years ago

Sorry about the double post. We had a power flash and I wasn’t sure if it posted.
After reading your reply I did some checking and found that I never bought the serial to USB adapter cable so the rig control was not working at all. Oops. Thanks for your help

73

Ed

Guest
KM6DOV
2 years ago

One thing I noticed when I use the Hold TX Freq is that my Enable TX doesn’t turn off when the caller responds to someone else. With the checkbox off, it will stop my xmit. It seems like the logic only applies when it sees someone else’s call on the Tx freq. Any way to enforce good behavior here?

Guest
Gary
2 years ago

I still use “none” and not split with 7610 because the tax chain is very linear and I don’t see any harmonics in the tx spectrum scope. Using fake it causes enough delay that a short burst of noise fills the spectrum scope. I have observed other transmitted signals that generate the noise burst. So it is cleaner to use none. You can see the noise if you start a ft8 transmission after the start of the period or abort early. It must have to do with wsjtx not being phase continuous at those times.

Guest
Alan
1 year ago

Hi
Is this same for JS8CALL

Callsign
G7ARK
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