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WSJT-X, Questions/réponses, entraide, actualité

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F4HTQ
Posted (edited)

ça bouge...

"

To:   WSJT-X users interested in testing FT4

From: K1JT, K9AN, and G4WJS

 

Soon after the "FT8 Roundup" held on December 1-2, 2018, we started serious work on a faster, more contest-friendly digital mode that can compete with RTTY-contesting QSO rates while preserving many of the benefits of FT8.  The result is FT4 -- a new digital mode specifically designed for radio contesting.

Over the past month a small group of volunteers have been conducting on-the-air tests of FT4.  The early tests were very successful and helped us to make a number of important design decisions.  We believe

FT4 has considerable promise for its intended purpose.

We'll soon be ready for testing by a larger group.  If you might be interested in participating and offering your considered feedback, please read the descriptive document "The FT4 Protocol for Digital Contesting", posted here:

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

We plan to post downloadable installation packages for WSJT-X 2.1.0-rc5 on April 29, one week from today.  The document linked above includes

  - Instructions for installing WSJT-X 2.1.0-rc5 and FT4 configuration

  - Operating instructions for FT4

  - Basic description of the FT4 protocol, modulation, and waveform

  - Detailed sensitivity measurements for FT4 under a wide variety of

    simulated propagation conditions

  - Schedule for upcoming test sessions

Please consider helping us to make FT4 a successful mode for digital contesting

With best wishes and 73,

                -- Joe (K1JT), Steve (K9AN), and Bill (G4WJS)

..."

 

Alors on va voir ce qu'il se passe.

Quand K1JT a crée le JT65 pour l'EME il s'est retrouvé "massivement" utilisé en HF.

Quand K1JT à crée le JT9 pour la HF, il a été assez peu utilisé en HF ( bien moins que le JT65), mais est pas mal utilisé sur les 630M.

Quand K1JT à crée le FT8 c'était pour les sporadiques ( 10M et surtout 6M)... on connais la suite.

Alors la, il nous parle du FT4 crée pour les concours... mais que ca t'il devenir ?

On va regarder à quoi ça ressemble.

David.

 

 

Edited by F4HTQ

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F4HTQ
Posted (edited)

Me revoila...

J'ai lu les spécificités de ce mode, et il me semble évident qu'il ne va pas être utilisé que pour les concours, mais aussi et surtout pour la course aux diplômes.

Pourquoi ? tout simplement car les échanges se font en 6 secondes au lieu des 15 secondes du FT8, donc un QSO devrait pouvoir se régler en 24 secondes.

Alors évidemment ça se paie au niveau du SNR minimal, -16.5dB au lieu de -24dB pour le FT8, il faut a peu prés 5.6 fois plus de puissance pour faire le QSO, mais comme les remplisseurs de log ont des stations taillées pour la phonie, ça ne devrait pas être un frein.

Ce qui est en train de progressivement disparaître c'est les QSO pour petites stations ou en "weak signal", on revient sur des niveaux de SNR quasiement jouables en CW ( il en manque plus grand chose) l'apport principal se trouvant donc au niveau de la vitesse de remplissage du log. 

La release candidate sera distribuée dans une semaine.

David.

 

Edited by F4HTQ

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F4HTQ

ça y est ça commence...🤣

"..I could also see some non-contest uses for it - think SOTA/WWFF/POTA type 'activations' which are not WARC band restricted but where an operator may wish to use a higher throughput rate for QSOs.  While primarily a contest tool, FT4 could serve as a mechanism for operators who operate non-contest award programs where there is some value in operating faster QSOs than FT8 or other low signal modes allow for..."

IL NOUS LE FAUT POUR LES ZACTIVATIONS !!!!

Visiblement, ça semble être une question de la plus haute importance.

24 secondes le QSO, ça aiguise les appétits.

 

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F4HTQ
Citation

The WSJT Development Group is pleased to announce the general availability (GA) release of WSJT-X Version 2.1.0.

 

WSJT-X 2.1 is a major upgrade that introduces FT4, a new protocol for HF contesting.  Improvements have also been made in the following areas:

 

   - FT8 waveform generation using GMSK, fully backward compatible

   - user options for low-sidelobe waterfall and spectrum display

   - UDP messaging for inter-program communication

   - accessibility

 

... as well as many minor enhancements and bug fixes.

 

We now provide a separate installation package for 64-bit Windows, offering significant improvements in decoding speed.

 

 

A more detailed list of program changes since WSJT-X 2.0.1 can be found

in the cumulative Release Notes:

http://physics.princeton.edu/pulsar/k1jt/Release_Notes.txt

 

Upgrading from earlier versions of WSJT-X should be seamless.  There is

no need to uninstall a previous version or move any files.

 

Please do not continue to use any release candidate -- that is, any beta

release with "-rc#" in the version name.

 

Links to installation packages for Windows, Linux, and Macintosh are

available here:

http://physics.princeton.edu/pulsar/k1jt/wsjtx.html

 

You can also download the packages from our SourceForge site:

https://sourceforge.net/projects/wsjt/files/

It may take a short time for the SourceForge site to be updated.

 

WSJT-X is licensed under the terms of Version 3 of the GNU General

Public License (GPL).  Development of this software is a cooperative

project to which many amateur radio operators have contributed.  If you

use our code, please have the courtesy to let us know about it.  If you

find bugs or make improvements to the code, please report them to us in

a timely fashion.

 

We hope you will enjoy using WSJT-X Version 2.1.0.

 

      -- 73, Joe, K1JT, for the WSJT Development Group

 

 

_______________________________________________

wsjt-devel mailing list

wsjt-devel@lists.sourceforge.net

https://lists.sourceforge.net/lists/listinfo/wsjt-devel

Le FT4 arrive donc dans une release officielle.

David.

 

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