mirror of
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First cut at adding FST4, FST4W to the User Guide.
This commit is contained in:
parent
475fe79d05
commit
598835d9c9
@ -30,8 +30,7 @@ set (UG_SRCS
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install-mac.adoc
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install-windows.adoc
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introduction.adoc
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measurement_tools.adoc
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protocols.adoc
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intro_subsections.adoc
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logging.adoc
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make-qso.adoc
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measurement_tools.adoc
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@ -53,6 +52,8 @@ set (UG_SRCS
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tutorial-example2.adoc
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tutorial-example3.adoc
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tutorial-example4.adoc
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tutorial-example5.adoc
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tutorial-example6.adoc
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tutorial-main-window.adoc
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tutorial-wide-graph-settings.adoc
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utilities.adoc
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@ -82,6 +83,9 @@ set (UG_IMGS
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images/FreqCal_Graph.png
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images/FreqCal_Results.png
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images/freemsg.png
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images/FST4_center.png
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images/FST4_Decoding_Limits.png
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images/FST4W_RoundRobin.png
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images/ft4_decodes.png
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images/ft4_waterfall.png
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images/ft8_decodes.png
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doc/user_guide/en/images/FST4W_RoundRobin.png
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doc/user_guide/en/images/FST4_Decoding_Limits.png
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doc/user_guide/en/images/FST4_center.png
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40
doc/user_guide/en/intro_subsections.adoc
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40
doc/user_guide/en/intro_subsections.adoc
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@ -0,0 +1,40 @@
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=== Documentation Conventions
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In this manual the following icons call attention to particular types
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of information:
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|
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NOTE: *Notes* containing information that may be of interest to
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particular classes of users.
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||||
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TIP: *Tips* on program features or capabilities that might otherwise be
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overlooked.
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IMPORTANT: *Warnings* about usage that could lead to undesired
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consequences.
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=== User Interface in Other Languages
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The _WSJT-X_ user interface is now available in many languages. When
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a translated user interface is available for the computer's default
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System Language, it will appear automatically on program startup.
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=== How You Can Contribute
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_WSJT-X_ is part of an open-source project released under the
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{gnu_gpl} (GPLv3). If you have programming or documentation skills or
|
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would like to contribute to the project in other ways, please make
|
||||
your interests known to the development team. We especially encourage
|
||||
those with translation skills to volunteer their help, either for
|
||||
this _User Guide_ or for the program's user interface.
|
||||
|
||||
The project's source-code repository can be found at {devrepo}, and
|
||||
communication among the developers takes place on the email reflector
|
||||
{devmail}. Bug reports and suggestions for new features, improvements
|
||||
to the _WSJT-X_ User Guide, etc., may be sent there as well. You must
|
||||
join the group before posting to the email list.
|
||||
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=== License
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Before using _WSJT-X_, please read our licensing terms
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<<LICENSE,here>>.
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@ -3,42 +3,39 @@
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_WSJT-X_ is a computer program designed to facilitate basic amateur
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radio communication using very weak signals. The first four letters in
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the program name stand for "`**W**eak **S**ignal communication by
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K1**JT**,`" while the suffix "`-X`" indicates that _WSJT-X_ started as
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an extended and experimental branch of the program _WSJT_,
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first released in 2001. Bill Somerville, G4WJS, and Steve Franke,
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K9AN, have been major contributors to program development since 2013
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and 2015, respectively.
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K1**JT**,`" while the suffix "`*-X*`" indicates that _WSJT-X_ started
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as an extended branch of an earlier program, _WSJT_, first released in
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2001. Bill Somerville, G4WJS, and Steve Franke, K9AN, have been major
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contributors to development of _WSJT-X_ since 2013 and 2015, respectively.
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_WSJT-X_ Version {VERSION_MAJOR}.{VERSION_MINOR} offers ten different
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protocols or modes: *FT4*, *FT8*, *JT4*, *JT9*, *JT65*, *QRA64*,
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*ISCAT*, *MSK144*, *WSPR*, and *Echo*. The first six are designed for
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making reliable QSOs under weak-signal conditions. They use nearly
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identical message structure and source encoding. JT65 and QRA64 were
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designed for EME ("`moonbounce`") on the VHF/UHF bands and have also
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proven very effective for worldwide QRP communication on the HF bands.
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QRA64 has some advantages over JT65, including better performance
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for EME on the higher microwave bands. JT9 was originally designed
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for the LF, MF, and lower HF bands. Its submode JT9A is 2 dB more
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sensitive than JT65 while using less than 10% of the bandwidth. JT4
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offers a wide variety of tone spacings and has proven highly effective
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for EME on microwave bands up to 24 GHz. These four "`slow`" modes
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use one-minute timed sequences of alternating transmission and
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reception, so a minimal QSO takes four to six minutes — two or three
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transmissions by each station, one sending in odd UTC minutes and the
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other even. FT8 is operationally similar but four times faster
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(15-second T/R sequences) and less sensitive by a few dB. FT4 is
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faster still (7.5 s T/R sequences) and especially well-suited for
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radio contesting. On the HF bands, world-wide QSOs are possible with
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any of these modes using power levels of a few watts (or even
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milliwatts) and compromise antennas. On VHF bands and higher, QSOs
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are possible (by EME and other propagation types) at signal levels 10
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to 15 dB below those required for CW.
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Note that even though their T/R sequences are short, FT4 and FT8 are
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classified as slow modes because their message frames are sent only
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once per transmission. All fast modes in _WSJT-X_ send their message
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frames repeatedly, as many times as will fit into the Tx sequence
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length.
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_WSJT-X_ Version {VERSION_MAJOR}.{VERSION_MINOR} offers twelve
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different protocols or modes: *FST4*, *FT4*, *FT8*, *JT4*, *JT9*,
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*JT65*, *QRA64*, *ISCAT*, *MSK144*, *WSPR*, *FST4W*, and *Echo*. The
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first seven are designed for making reliable QSOs under weak-signal
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conditions. They use nearly identical message structure and source
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encoding. JT65 and QRA64 were designed for EME ("`moonbounce`") on
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the VHF/UHF bands and have also proven very effective for worldwide
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QRP communication on the HF bands. QRA64 has some advantages over
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JT65, including better performance for EME on the higher microwave
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bands. JT9 was originally designed for the HF and lower
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bands. Its submode JT9A is nearly 2 dB more sensitive than JT65 while using
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less than 10% of the bandwidth. JT4 offers a wide variety of tone
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spacings and has proven highly effective for EME on microwave bands up
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to 24 GHz. These four "`slow`" modes use one-minute timed sequences
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of alternating transmission and reception, so a minimal QSO takes four
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to six minutes — two or three transmissions by each station, one
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sending in odd UTC minutes and the other even. FT8 is operationally
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similar but four times faster (15-second T/R sequences) and less
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sensitive by a few dB. FT4 is faster still (7.5 s T/R sequences) and
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especially well-suited for radio contesting. FST4 was added to
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_WSJT-X_ in version 2.3.0. It is intended especially for use on the
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LF and MF bands; further details can be found in the following
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section, <<NEW_FEATURES,New Features in Version 2.3.0>>.
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On the HF bands, world-wide QSOs are possible with any of these modes
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using power levels of a few watts (or even milliwatts) and compromise
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antennas. On VHF bands and higher, QSOs are possible (by EME and
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other propagation types) at signal levels 10 to 15 dB below those
|
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required for CW.
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|
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*ISCAT*, *MSK144*, and optionally submodes *JT9E-H* are "`fast`"
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protocols designed to take advantage of brief signal enhancements from
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@ -51,15 +48,25 @@ messages up to 28 characters long, while MSK144 uses the same
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structured messages as the slow modes and optionally an abbreviated
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format with hashed callsigns.
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Note that some of the modes classified as slow can have T/R sequence
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lengths as short the fast modes. "`Slow`" in this sense implies
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message frames being sent only once per transmission. The fast modes
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in _WSJT-X_ send their message frames repeatedly, as many times as
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will fit into the Tx sequence length.
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*WSPR* (pronounced "`whisper`") stands for **W**eak **S**ignal
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**P**ropagation **R**eporter. The WSPR protocol was designed for probing
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potential propagation paths using low-power transmissions. WSPR
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messages normally carry the transmitting station’s callsign, grid
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locator, and transmitter power in dBm, and they can be decoded at
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signal-to-noise ratios as low as -31 dB in a 2500 Hz bandwidth. WSPR
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users with internet access can automatically upload reception
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reports to a central database called {wsprnet} that provides a mapping
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facility, archival storage, and many other features.
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**P**ropagation **R**eporter. The WSPR protocol was designed for
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probing potential propagation paths using low-power transmissions.
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WSPR messages normally carry the transmitting station’s callsign,
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grid locator, and transmitter power in dBm, and with two-minute
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sequences they can be decoded at signal-to-noise ratios as low
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as -31 dB in a 2500 Hz bandwidth. *FST4W* is designed for
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similar purposes, but especially for use on LF and MF bands.
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It includes optional sequence lengths as long as 30 minutes and
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reaches sensitivity tresholds as low as -45 dB. WSPR and FST4W users
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with internet access can automatically upload reception reports to a
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central database called {wsprnet} that provides a mapping facility,
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archival storage, and many other features.
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*Echo* mode allows you to detect and measure your own station's echoes
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from the moon, even if they are far below the audible threshold.
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@ -1,107 +1,31 @@
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[[NEW_FEATURES]]
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=== New in Version {VERSION}
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*Improvements to decoders*
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_WSJT-X 2.3.0_ introduces *FST4* and *FST4W*, new digital protocols
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designed particularly for the LF and MF bands. On these bands their
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fundamental sensitivities are better than other _WSJT-X_ modes with the
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same sequence lengths, approaching the theoretical limits for their
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rates of information throughput. FST4 is optimized for two-way QSOs,
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while FST4W is for quasi-beacon transmissions of WSPR-style messages.
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FST4 and FST4W do not require the strict, independent time
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synchronization and phase locking of modes like EbNaut.
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*FT4:* Corrected bugs that prevented AP (_a priori_) decoding and/or
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multi-pass decoding in some circumstances. Improved and extended the
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algorithm for AP decoding.
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The new modes use 4-GFSK modulation and share common software for
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encoding and decoding messages. FST4 offers T/R sequence lengths of
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15, 30, 60, 120, 300, 900, and 1800 seconds, while FST4W omits the
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lengths shorter than 120 s. Submodes are given names like FST4-60,
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FST4W-300, etc., the appended numbers indicating sequence length in
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seconds. Message payloads contain either 77 bits, as in FT4, FT8, and
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MSK144, or 50 bits for the WSPR-like messages of FST4W. Message
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formats displayed to the user are like those in the other 77-bit and
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50-bit modes in _WSJT-X_. Forward error correction uses a low density
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parity check (LDPC) code with 240 information and parity bits.
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Transmissions consist of 160 symbols: 120 information-carrying symbols
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of two bits each, interspersed with five groups of eight predefined
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synchronization symbols.
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*FT8:* Decoding is now spread over three intervals. The first starts
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11.8 s into an Rx sequence and typically yields around 85% of the
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possible decodes, so you see most decodes much earlier than before. A
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second processing step starts at 13.5 s, and the final one at 14.7 s.
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Overall decoding yield on crowded bands is improved by 10% or more.
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Systems with receive latency greater than 0.2 s will see smaller
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improvements, but will still see many decodes earlier than before.
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SNR estimates no longer saturate at +20 dB, and large signals in the
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passband no longer cause the SNR of weaker signals to be biased low.
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Times written to cumulative journal file ALL.TXT are now correct even
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when the decode occurs after the T/R sequence boundary. In FT8
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DXpedition Mode, AP decoding is now implemented for Hounds when the
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Fox has a compound callsign.
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*JT4:* Formatting and display of averaged and Deep Search decodes has
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been cleaned up and made consistent with other modes used for EME and
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extreme weak-signal work on microwave bands.
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*JT65:* Many improvements have been made for averaged and Deep Search
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decodes, and their display to the user. For details see <<VHF_JT65,JT65>>
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in the <<VHF_AND_UP,VHF+ Features>> section of this guide.
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*WSPR:* Significant improvements have been made to the WSPR decoder's
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sensitivity, its ability to cope with many signals in a crowded
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sub-band, and its rate of undetected false decodes. We now use up to
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three decoding passes. Passes 1 and 2 use noncoherent demodulation of
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single symbols and allow for frequency drifts up to ±4 Hz in a
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transmission. Pass 3 assumes no drift and does coherent block
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detection of up to three symbols. It also applies bit-by-bit
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normalization of the single-symbol bit metrics, a technique that has
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proven helpful for signals corrupted by artifacts of the subtraction
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of stronger signals and also for LF/MF signals heavily contaminated by
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lightning transients. With these improvements the number of decodes
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in a crowded WSPR sub-band typically increases by 10 to 15%.
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*New message format:* When *EU VHF Contest* is selected, the Tx2 and
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Tx3 messages -- those conveying signal report, serial number, and
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6-character locator -- now use hashcodes for both callsigns. This
|
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change is *not* backward compatible with earlier versions of _WSJT-X_, so
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all users of *EU VHF Contest* messages should be sure to upgrade to
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version 2.2.0. See <<CONTEST_MSGS,Contest Messages>> for details.
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*Minor enhancements and bug fixes*
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- *Save None* now writes no .wav files to disk, even temporarily.
|
||||
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- An explicit entry for *WW Digi Contest* has been added to *Special
|
||||
operating activities* on the *Settings | Advanced* tab.
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|
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- The contest mode FT4 now always uses RR73 for the Tx4 message.
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|
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- *Keyboard shortcuts* have been added as an aid to accessibility:
|
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*Alt+R* sets Tx4 message to RR73, *Ctrl+R* sets it to RRR.
|
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|
||||
- The *Status bar* now displays the number of decodes found in the
|
||||
most recent Rx sequence.
|
||||
|
||||
- As an aid for partial color-blindness, the "`inverted goal posts`"
|
||||
marking Rx frequency on the Wide Graph's frequency scale are now in a
|
||||
darker shade of green.
|
||||
|
||||
=== Documentation Conventions
|
||||
|
||||
In this manual the following icons call attention to particular types
|
||||
of information:
|
||||
|
||||
NOTE: *Notes* containing information that may be of interest to
|
||||
particular classes of users.
|
||||
|
||||
TIP: *Tips* on program features or capabilities that might otherwise be
|
||||
overlooked.
|
||||
|
||||
IMPORTANT: *Warnings* about usage that could lead to undesired
|
||||
consequences.
|
||||
|
||||
=== User Interface in Other Languages
|
||||
|
||||
Thanks to Xavi Perez, EA3W, in cooperation with G4WJS, the _WSJT-X_
|
||||
user interface is now available the Catalan language. Spanish will
|
||||
follow soon, and other languages when translations are made. When a
|
||||
translated user interface is available for the computer's default
|
||||
System Language, it will appear automatically on program startup.
|
||||
|
||||
=== How You Can Contribute
|
||||
|
||||
_WSJT-X_ is part of an open-source project released under the
|
||||
{gnu_gpl} (GPLv3). If you have programming or documentation skills or
|
||||
would like to contribute to the project in other ways, please make
|
||||
your interests known to the development team. We especially encourage
|
||||
those with translation skills to volunteer their help, either for
|
||||
this _User Guide_ or for the program's user interface.
|
||||
|
||||
The project's source-code repository can be found at {devrepo}, and
|
||||
communication among the developers takes place on the email reflector
|
||||
{devmail}. Bug reports and suggestions for new features, improvements
|
||||
to the _WSJT-X_ User Guide, etc., may be sent there as well. You must
|
||||
join the group before posting to the email list.
|
||||
*We recommend that on the 2200 and 630 m bands FST4 should replace JT9
|
||||
for making 2-way QSOs, and FST4W should replace WSPR for propagation
|
||||
tests*. Operating conventions on these LF and MF bands will
|
||||
eventually determine the most useful T/R sequence lengths for each
|
||||
type of operation.
|
||||
|
@ -14,7 +14,7 @@ Special cases allow other information such as add-on callsign prefixes
|
||||
aim is to compress the most common messages used for minimally valid
|
||||
QSOs into a fixed 72-bit length.
|
||||
|
||||
The information payload for FT4, FT8, and MSK144 contains 77 bits.
|
||||
The information payloads for FST4, FT4, FT8, and MSK144 contain 77 bits.
|
||||
The 5 new bits added to the original 72 are used to flag special
|
||||
message types signifying special message types used for FT8 DXpedition
|
||||
Mode, contesting, nonstandard callsigns, and a few other
|
||||
@ -54,7 +54,7 @@ were the callsigns `E9AA` through `E9ZZ`. Upon reception they are
|
||||
converted back to the form `CQ AA` through `CQ ZZ`, for display to the
|
||||
user.
|
||||
|
||||
The FT4, FT8, and MSK144 protocols use different lossless compression
|
||||
The FST4, FT4, FT8, and MSK144 protocols use different lossless compression
|
||||
algorithms with features that generate and recognize special messages
|
||||
used for contesting and other special purposes. Full details have
|
||||
been published in QEX, see {ft4_ft8_protocols}.
|
||||
@ -71,6 +71,21 @@ _WSJT-X_ modes have continuous phase and constant envelope.
|
||||
[[SLOW_MODES]]
|
||||
=== Slow Modes
|
||||
|
||||
[[FST4PRO]]
|
||||
==== FST4
|
||||
|
||||
FST4 offers T/R sequence lengths of 15, 30, 60, 120, 300, 900, and
|
||||
1800 seconds. Submodes are given names like FST4-60, FST4-120, etc.,
|
||||
the appended numbers indicating sequence length in seconds. Message
|
||||
payloads contain 77 bits, and a 24-bit cyclic redundancy check (CRC)
|
||||
appended to create a 101-bit message-plus-CRC word. Forward error
|
||||
correction is accomplished using a (240,101) LDPC code. Transmissions
|
||||
consist of 160 symbols: 120 information-carrying symbols of two bits
|
||||
each, interspersed with five groups of eight predefined
|
||||
synchronization symbols. Modulation uses 4-tone frequency-shift
|
||||
keying (4-GFSK) with Gaussian smoothing of frequency transitions.
|
||||
|
||||
|
||||
[[FT4PRO]]
|
||||
==== FT4
|
||||
|
||||
@ -225,6 +240,20 @@ information the least significant. Thus, on a 0 – 3 scale, the tone
|
||||
for a given symbol is twice the value (0 or 1) of the data bit, plus
|
||||
the sync bit.
|
||||
|
||||
[[FST4WPRO]]
|
||||
==== FST4W
|
||||
|
||||
FST4W offers T/R sequence lengths of 120, 300, 900, and 1800 seconds.
|
||||
Submodes are given names like FST4W-120, FST4W-300, etc., the appended
|
||||
numbers indicating sequence length in seconds. Message payloads
|
||||
contain 50 bits, and a 24-bit cyclic redundancy check (CRC) appended
|
||||
to create a 74-bit message-plus-CRC word. Forward error correction
|
||||
is accomplished using a (240,74) LDPC code. Transmissions consist of
|
||||
160 symbols: 120 information-carrying symbols of two bits each,
|
||||
interspersed with five groups of eight predefined synchronization
|
||||
symbols. Modulation uses 4-tone frequency-shift keying (4-GFSK) with
|
||||
Gaussian smoothing of frequency transitions.
|
||||
|
||||
[[SLOW_SUMMARY]]
|
||||
==== Summary
|
||||
|
||||
@ -239,17 +268,28 @@ which the probability of decoding is 50% or higher.
|
||||
|
||||
[[SLOW_TAB]]
|
||||
.Parameters of Slow Modes
|
||||
[width="90%",cols="3h,^3,^2,^1,^2,^2,^2,^2,^2,^2",frame=topbot,options="header"]
|
||||
[width="100%",cols="3h,^3,^2,^1,^2,^2,^2,^2,^2,^2",frame=topbot,options="header"]
|
||||
|===============================================================================
|
||||
|Mode |FEC Type |(n,k) | Q|Modulation type|Keying rate (Baud)|Bandwidth (Hz)
|
||||
|Sync Energy|Tx Duration (s)|S/N Threshold (dB)
|
||||
|FT4 |LDPC, r=1/2|(174,91)| 4| 4-GFSK| 20.8333 | 83.3 | 0.15| 5.04 | -17.5
|
||||
|FT8 |LDPC, r=1/2|(174,91)| 8| 8-GFSK| 6.25 | 50.0 | 0.27| 12.6 | -21
|
||||
|FST4-15 |LDPC | (240,101)| 4| 4-GFSK| 16.6667 | 67.7 | 0.25| 9.60 | -20.7
|
||||
|FST4-30 |LDPC | (240,101)| 4| 4-GFSK| 7.14 | 28.6 | 0.25| 22.4 | -24.2
|
||||
|FST4-60 |LDPC | (240,101)| 4| 4-GFSK| 3.09 | 12.4 | 0.25| 51.8 | -28.1
|
||||
|FST4-120 |LDPC | (240,101)| 4| 4-GFSK| 1.46 | 5.9 | 0.25| 109.3 | -31.3
|
||||
|FST4-300 |LDPC | (240,101)| 4| 4-GFSK| 0.56 | 2.2 | 0.25| 286.7 | -35.3
|
||||
|FST4-900 |LDPC | (240,101)| 4| 4-GFSK| 0.180 | 0.72 | 0.25| 887.5 | -40.2
|
||||
|FST4-1800 |LDPC | (240,101)| 4| 4-GFSK| 0.089 | 0.36 | 0.25| 1792.0| -43.2
|
||||
|FT4 |LDPC |(174,91)| 4| 4-GFSK| 20.8333 | 83.3 | 0.15| 5.04 | -17.5
|
||||
|FT8 |LDPC |(174,91)| 8| 8-GFSK| 6.25 | 50.0 | 0.27| 12.6 | -21
|
||||
|JT4A |K=32, r=1/2|(206,72)| 2| 4-FSK| 4.375| 17.5 | 0.50| 47.1 | -23
|
||||
|JT9A |K=32, r=1/2|(206,72)| 8| 9-FSK| 1.736| 15.6 | 0.19| 49.0 | -27
|
||||
|JT9A |K=32, r=1/2|(206,72)| 8| 9-FSK| 1.736| 15.6 | 0.19| 49.0 | -26
|
||||
|JT65A |Reed Solomon|(63,12) |64|65-FSK| 2.692| 177.6 | 0.50| 46.8 | -25
|
||||
|QRA64A|Q-ary Repeat Accumulate|(63,12) |64|64-FSK|1.736|111.1|0.25|48.4| -26
|
||||
| WSPR |K=32, r=1/2|(162,50)| 2| 4-FSK| 1.465| 5.9 | 0.50|110.6 | -31
|
||||
|FST4W-120 |LDPC | (240,74)| 4| 4-GFSK| 1.46 | 5.9 | 0.25| 109.3 | -32.8
|
||||
|FST4W-300 |LDPC | (240,74)| 4| 4-GFSK| 0.56 | 2.2 | 0.25| 286.7 | -36.8
|
||||
|FST4W-900 |LDPC | (240,74)| 4| 4-GFSK| 0.180 | 0.72 | 0.25| 887.5 | -41.7
|
||||
|FST4W-1800 |LDPC | (240,74)| 4| 4-GFSK| 0.089 | 0.36 | 0.25| 1792.0| -44.8
|
||||
|===============================================================================
|
||||
|
||||
Submodes of JT4, JT9, JT65, and QRA64 offer wider tone spacings for
|
||||
@ -259,12 +299,10 @@ threshold sensitivities of the various submodes when spreading is
|
||||
comparable to tone spacing.
|
||||
|
||||
[[SLOW_SUBMODES]]
|
||||
.Parameters of Slow Submodes
|
||||
.Parameters of Slow Submodes with Wider Tome Spacings
|
||||
[width="50%",cols="h,3*^",frame=topbot,options="header"]
|
||||
|=====================================
|
||||
|Mode |Tone Spacing |BW (Hz)|S/N (dB)
|
||||
|FT4 |20.8333 | 83.3 |-17.5
|
||||
|FT8 |6.25 | 50.0 |-21
|
||||
|JT4A |4.375| 17.5 |-23
|
||||
|JT4B |8.75 | 30.6 |-22
|
||||
|JT4C |17.5 | 56.9 |-21
|
||||
@ -272,7 +310,7 @@ comparable to tone spacing.
|
||||
|JT4E |78.75| 240.6 |-19
|
||||
|JT4F |157.5| 476.9 |-18
|
||||
|JT4G |315.0| 949.4 |-17
|
||||
|JT9A |1.736| 15.6 |-27
|
||||
|JT9A |1.736| 15.6 |-26
|
||||
|JT9B |3.472| 29.5 |-26
|
||||
|JT9C |6.944| 57.3 |-25
|
||||
|JT9D |13.889| 112.8 |-24
|
||||
|
24
doc/user_guide/en/tutorial-example5.adoc
Normal file
24
doc/user_guide/en/tutorial-example5.adoc
Normal file
@ -0,0 +1,24 @@
|
||||
FST4 is is designed for making 2-way QSOs on the LF and MF bands. Do
|
||||
not confuse it with FT4, which has a very different purpose! Most
|
||||
on-screen controls, auto-sequencing, and other features behave in FST4
|
||||
as in other modes. However, operating conventions on the 2200 and 630
|
||||
m bands make it desirable to have additional user controls that set
|
||||
the active frequency range for decoding. Spin boxes labeled *F Low*
|
||||
and *F High* set lower and upper frequency limits for the FST4
|
||||
decoder.
|
||||
|
||||
image::FST4_center.png[align="center"]
|
||||
|
||||
Decoding limits are marked by dark green angle-bracket symbols *< >* on
|
||||
the Wide Graph frequency scale:
|
||||
|
||||
image::FST4_Decoding_Limits.png[align="center"]
|
||||
|
||||
In general the specified range should be no larger than needed, since
|
||||
detected transmissions in modes other than the selected FST4 sequence
|
||||
length will be undecodable and will slow down the decoding process.
|
||||
|
||||
If *Single decode* on the the *File | Settings | General* tab is
|
||||
checked, the decoding range is further limited to the *F Tol* range
|
||||
around *Rx Freq*.
|
||||
|
16
doc/user_guide/en/tutorial-example6.adoc
Normal file
16
doc/user_guide/en/tutorial-example6.adoc
Normal file
@ -0,0 +1,16 @@
|
||||
FST4W has significant advantages over WSPR for use on the 2200 and 630
|
||||
m bands. As for WSPR, the default Rx Freq is 1500 Hz and F Tol is
|
||||
100 Hz, so the active decoding range 1400 to 1600 Hz. However, for added
|
||||
flexibility you can select different center frequencies and F Tol values.
|
||||
We expect that usage conventions will soon be established for FST4 activity on 2200 and 630 m.
|
||||
|
||||
A new drop-down control below F Tol offers a round-robin mode for
|
||||
scheduling FST4W transmissions:
|
||||
|
||||
image::FST4W_RoundRobin.png[align="center"]
|
||||
|
||||
If three operators agree in advance to select the options 1/3, 2/3,
|
||||
and 3/3, for example, their FST4W transmissions will occur in a fixed
|
||||
sequence with no two stations transmitting simultaneously. Sequence 1
|
||||
is the first sequence after 00:00 UTC. For WSPR-like scheduling
|
||||
behavior, you should select Random with this control.
|
@ -32,6 +32,9 @@ include::introduction.adoc[]
|
||||
[[NEW_FEATURES]]
|
||||
include::new_features.adoc[]
|
||||
|
||||
[[INTRO_SUBSECTIONS]]
|
||||
include::intro_subsections.adoc[]
|
||||
|
||||
[[SYSREQ]]
|
||||
== System Requirements
|
||||
include::system-requirements.adoc[]
|
||||
@ -162,6 +165,14 @@ include::tutorial-example3.adoc[]
|
||||
=== FT4
|
||||
include::tutorial-example4.adoc[]
|
||||
|
||||
[[TUT_EX5]]
|
||||
=== FST4
|
||||
include::tutorial-example5.adoc[]
|
||||
|
||||
[[TUT_EX6]]
|
||||
=== FST4W
|
||||
include::tutorial-example6.adoc[]
|
||||
|
||||
[[MAKE_QSOS]]
|
||||
== Making QSOs
|
||||
include::make-qso.adoc[]
|
||||
|
Loading…
Reference in New Issue
Block a user