New Digi Mode for LF/MF FST4

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Bachlor
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Имя: Александр
Позывной: R6LDD, UA1021SWL

New Digi Mode for LF/MF FST4

#1

Сообщение Bachlor »

Рассылка RSGB. Сотворили новую моду цифровую. На КВ тож гоняют.
As some of you know, I have been part of the test group for the new
modes. I think they should be available very soon. Just a few final
things being worked on.



I can share a few test results comparing WSPR to FST4W.

http://n1bug.com/FST4WvsWSPR/2E0ILY.txt

http://n1bug.com/FST4WvsWSPR/K3RWR.txt



And also some internal tests with FST4W-1800.

http://n1bug.com/FST4W_Test/FST4W-1800A ... _Notes.txt

http://n1bug.com/FST4W_Test/FST4W-1800A ... ecodes.txt



One problem regarding FST4W and WSPRnet. WSPRnet does not provide any
way to tell FST4W apart from WSPR. Also no way to know which T/R period
is being used. To make it even worse, WSPRnet "corrects" times ending in
5 to make them look like WSPR2 ! I hope some of you will join me in
using call sign suffixes to show which mode and speed you are reporting.
All of my spots are uploaded like this:

N1BUG/2 ... WSPR2
N1BUG/15 ... WSPR15
N1BUG/120 ... FST4W-120
N1BUG/300 ... FST4W-300
N1BUG/900 ... FST4W-900
N1BUG/1800 ... FST4W-1800

I use these for RX reporting only. On TX I use only my call sign N1BUG
from another WSJT-X instance. That is because the suffix will cause
problems with the message encoding.



Nightly monitoring for this winter at my station will be WSPR2, WSPR15,
FST4W-120/300/900/1800, Op32, EU and TA QRSS windows. I will also
monitor some FST4 but not sure which speeds.

I will be very interested to try some DX QSOs with FST4 !

73,
Paul N1BUG
У кого есть хотелка - велком. :\m/: :acute:
KO89WC( Вологодская обл.)
Per aspera ad asra.

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Bachlor
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New Digi Mode for LF/MF FST4

#2

Сообщение Bachlor »

Продлжение.
The first public candidate release of WSJT-X 2.3.0 is now available for
download and use by beta testers. This release is your first chance to
try two new modes designed especially for use on the LF and MF bands,
and to provide feedback to the WSJT Development Team. The new modes are:

- FST4, for 2-way QSOs. Options for sequence lengths from 15 seconds
to 30 minutes, with threshold sensitivities from -20.7 to -43.2 dB in
a 2500 Hz reference bandwidth.

- FST4W, for WSPR-like transmissions. Sequence lengths from 2 minutes
to 30 minutes, threshold sensitivities from -32.8 to -44.8 dB.

FST4-60 is about 1.7 dB more sensitive than JT9, largely because it uses
multi-symbol block detection where appropriate. With AP decoding in FST4
the advantage can be as much as 4.7 dB. Additional sensitivity details
with respect to path Doppler spread are illustrated in the following
graph comparing JT9 and FST4-60:
https://physics.princeton.edu/pulsar/k1 ... s_fst4.pdf

FST4W-120 is about 1.4 dB more sensitive than WSPR, and FST4W submodes
with longer transmissions have proportionally better sensitivity.
Decoding probabilities are plotted as a function of SNR on the additive
white Gaussian noise (AWGN) channel for WSPR and all FST4W submodes
here: https://physics.princeton.edu/pulsar/k1 ... _fst4w.pdf

Tests over the past several months have shown FST4 and FST4W frequently
spanning intercontinental distances on the 2200 m and 630 m bands.
Further details and operating hints can be found in the "Quick-Start
Guide to FST4 and FST4W":

https://physics.princeton.edu/pulsar/k1 ... _Start.pdf

We strongly recommend that users of JT9 and WSPR on the LF and MF bands
should migrate to the more sensitive modes FST4 and FST4W.


Links to installation packages for Windows, Linux, and Macintosh are
available here:
http://physics.princeton.edu/pulsar/k1jt/wsjtx.html
Scroll down to find "Candidate release: WSJT-X 2.3.0-rc1".

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 this beta release of WSJT-X 2.3.0. Please
report bugs by following instructions found here in the User Guide:
http://www.physics.princeton.edu/pulsar ... ug_reports
KO89WC( Вологодская обл.)
Per aspera ad asra.

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Rybak27
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New Digi Mode for LF/MF FST4

#3

Сообщение Rybak27 »

Спасибо большое за информацию!
Я антенну поправлю немного, попробую помониторить.
Наблюдения буду выкладывать сюда.

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Bachlor
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New Digi Mode for LF/MF FST4

#4

Сообщение Bachlor »

Rybak27 писал(а):
04 окт 2020, 14:44
Я антенну поправлю немного, попробую помониторить.
Попобую повещать. QRPP. Как силов наберусь.
KO89WC( Вологодская обл.)
Per aspera ad asra.

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