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Author Topic: The FT4 Protocol for Digital Contesting.  (Read 2636 times)
VA3VF
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Posts: 3002




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« on: April 22, 2019, 02:35:39 PM »

http://physics.princeton.edu/pulsar/k1jt/FT4_Protocol.pdf
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WD7E
Member

Posts: 10




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« Reply #1 on: April 22, 2019, 04:01:28 PM »

Excellent!  FT8 is great for these bottom cycle conditions, but it lacks a bit as a contest mode.  I know, not everyone likes contests, I get that.  But for those of us who do, I say "yeah! can't wait!" 

Thanks, and 73 to K1JT and team!

Bill
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K0UA
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Posts: 4813




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« Reply #2 on: April 22, 2019, 04:25:50 PM »

Looking forward to playing with it.
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73  James K0UA
ARRL Missouri Technical Specialist
W6VZV
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Posts: 23




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« Reply #3 on: April 23, 2019, 07:31:34 AM »

Looking forward to playing with it.

Same here de Roger W6VZV
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AE5X
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Posts: 1465




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« Reply #4 on: April 23, 2019, 12:09:46 PM »

I'm looking forward to it too. Did you notice that one more step in the automation process has been added:

"One new on-screen control is available for FT4 operation, a button labeled Best S+P, just below the Call 1st checkbox. Clicking this button during an Rx cycle arms the program to examine all CQ messages decoded at the end of the 6-second Rx sequence. The program will select the best potential QSO partner (from a contesting perspective), and treat it as if you had double-clicked on that line of decoded text. Here “best potential QSO partner” means “New Multiplier” (1st priority) or “New Call on Band” (2nd priority). “New Multiplier” is currently interpreted to mean “New DXCC”; a more broadly defined multiplier category (for the ARRL RTTY Roundup rules) will be implemented soon. We may also provide additional priority rankings, for example “New Grid on Band” (useful for North American VHF contests), sorting by signal strength, etc."
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VA3VF
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Posts: 3002




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« Reply #5 on: April 23, 2019, 03:29:47 PM »

Quote
Did you notice that one more step in the automation process has been added:
Just accept it, it hurts less. Grin

FT2 will be fully automatic. There is no way a human can make a QSO decision in 2-3 seconds. Wink

Jokes aside, I'm looking forward to it. FT8 contesting did not impress me. FT4 may be different.

Good to see that K1JT and team are still brainstorming, and developing new modes.
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AE5X
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Posts: 1465




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« Reply #6 on: April 24, 2019, 08:39:19 AM »

Quote
Did you notice that one more step in the automation process has been added:
Just accept it, it hurts less. Grin

Oh I'm totally onboard with it.
Here's a video from the Man Himself on FT4:
https://ae5x.blogspot.com/2019/04/ft4-video-presentation-by-k1jt.html
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AE5X
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Posts: 1465




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« Reply #7 on: April 24, 2019, 09:28:50 AM »

Addendum:

"At about 20 minutes into the video presentation, Joe describes FT4 as being asynchronous, meaning that you can start transmitting any time you wish, rather than being synchronized to an accurate clock.  That asynchronous method did not work out as well as expected in on-the-air testing, and was abandoned.
 
The version of FT4 that will be coming out on Monday is synchronous, on a 6-second cycle, and requires a more accurate clock than FT8.  One thing that you can do now, before the program release on Monday, is to make sure that your computer clock is as accurate as possible.  The Meinberg NTP program is recommended by K1JT for keeping your clock accurate https://www.meinbergglobal.com/english/sw/ntp.htm
 
You can check the accuracy of your computer clock by going to www.time.is
 
Dave Hachadorian, K6LL"
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PU2OZT
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Posts: 116




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« Reply #8 on: April 24, 2019, 09:37:08 AM »

FT8 + Contest, can't be better than that  Angry + Angry
Not funny what that old fart stated to his audience of even older operators @6:40. But hey!! screwing up even more the radio-amateur hobby, them, they won't be missing too much, after everyone got addicted -his words- to a silly and effortless propagation checker.
 
Oliver
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K0UA
Member

Posts: 4813




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« Reply #9 on: April 24, 2019, 10:14:05 AM »

FT8 + Contest, can't be better than that  Angry + Angry
Not funny what that old fart stated to his audience of even older operators @6:40. But hey!! screwing up even more the radio-amateur hobby, them, they won't be missing too much, after everyone got addicted -his words- to a silly and effortless propagation checker.
 
Oliver

I don't know about you but I was invited out to Field Day to run an FT8 station, and I am excited to do it. What do you think about them apples?  Smiley
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73  James K0UA
ARRL Missouri Technical Specialist
PU2OZT
Member

Posts: 116




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« Reply #10 on: April 24, 2019, 10:45:52 AM »

Rather working on my homebrew MLA or reading chapters of the ARRL Handbook, if not able to make contacts... and you'll miss the tricky part and sole interesting aspect of any Digital Mode, installing programs, connecting radios, interfaces and computers.

Oliver
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K0UA
Member

Posts: 4813




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« Reply #11 on: April 24, 2019, 12:53:53 PM »

Rather working on my homebrew MLA or reading chapters of the ARRL Handbook, if not able to make contacts... and you'll miss the tricky part and sole interesting aspect of any Digital Mode, installing programs, connecting radios, interfaces and computers.

Oliver

Well, actually I have quite a bit of expertise in interfacing, and I am personally responsible for getting dozens of hams going on digital modes. So by extension perhaps I am partially the blame for
"What is wrong with ham radio today"    Smiley  Smiley   ... I would like to think so...Smiley
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73  James K0UA
ARRL Missouri Technical Specialist
VA3VF
Member

Posts: 3002




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« Reply #12 on: April 25, 2019, 05:36:03 PM »

This may interest some people:

Dr. Taylor - FT8 & Beyond: FT4 - Finale, this mode is 3x Faster than FT8

https://www.youtube.com/watch?time_continue=498&v=2Pd7zB40xdY

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K0UA
Member

Posts: 4813




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« Reply #13 on: April 29, 2019, 02:53:46 PM »

Has anyone tried FT4 yet.  It is up on the website  2.0.1 rc5.
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73  James K0UA
ARRL Missouri Technical Specialist
K6JH
Member

Posts: 525




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« Reply #14 on: April 29, 2019, 02:59:20 PM »

Addendum:

"At about 20 minutes into the video presentation, Joe describes FT4 as being asynchronous, meaning that you can start transmitting any time you wish, rather than being synchronized to an accurate clock.  That asynchronous method did not work out as well as expected in on-the-air testing, and was abandoned.
 
The version of FT4 that will be coming out on Monday is synchronous, on a 6-second cycle, and requires a more accurate clock than FT8.  One thing that you can do now, before the program release on Monday, is to make sure that your computer clock is as accurate as possible.  The Meinberg NTP program is recommended by K1JT for keeping your clock accurate https://www.meinbergglobal.com/english/sw/ntp.htm
 
You can check the accuracy of your computer clock by going to www.time.is
 
Dave Hachadorian, K6LL"


So the question is - just how accurate does the clock have to be? I didn't see where Dr Taylor specified it...

Not that I care. I've got a USB GPS receiver syncing my clock, and I routinely get better than 0.1 seconds off at time.is. But an answer might be of use to others.

I've been using NMEATime2 from visualgps, just because it has some cool charts. $20.48. http://www.visualgps.net/#nmeatime2-content
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73
Jim K6JH
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