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Add a section on EME Tips to the User Guide.
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@ -74,6 +74,9 @@ set (UG_IMGS
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images/decodes.png
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images/download_samples.png
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images/echo_144.png
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images/EME_Deep_0.png
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images/EME_Deep_1.png
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images/EME_Deep_2.png
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images/file-menu.png
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images/FreqCal.png
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images/FreqCal_Graph.png
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@ -1,3 +1,4 @@
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[[AP_Decoding]]
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=== AP Decoding
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The _WSJT-X_ decoders for FT4, FT8, JT65, and QRA64 include optional
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@ -92,6 +93,7 @@ averaged to obtain the decode.
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|===========================================
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[[Decoded_Lines]]
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=== Decoded Lines
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Displayed information accompanying decoded messages generally includes UTC,
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@ -109,10 +111,10 @@ summarized in the following Table:
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|===========================================
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|Mode |Mode character|Sync character|End of line information
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|FT8 | ~ | | ?   aP
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|JT4 | $ | *, # | f, fN, dNC
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|JT4 | $ | *, # | f, fN, dCN
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|JT9 | @ | |
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|JT65 | # | |
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|JT65 VHF| # | *, # | f, fN, dNC
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|JT65 VHF| # | *, # | f, fN, dCN
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|QRA64 | : | * | R
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|ISCAT | | * | M N C T
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|MSK144 | & | | N H E
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doc/user_guide/en/images/EME_Deep_0.png
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doc/user_guide/en/images/EME_Deep_0.png
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doc/user_guide/en/images/EME_Deep_1.png
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doc/user_guide/en/images/EME_Deep_1.png
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doc/user_guide/en/images/EME_Deep_2.png
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@ -4,11 +4,10 @@ _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 e**Xt**ended (and originally e**X**perimental) branch of the
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program _WSJT_.
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Bill Somerville, G4WJS, and Steve Franke, K9AN, have been major
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contibutors to program development since 2013 and 2015, respectively.
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an e**Xt**ended and e**X**perimental 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 contibutors to program development since 2013
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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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@ -335,10 +335,91 @@ of the plot area on the Echo Graph window.
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image::echo_144.png[align="center",alt="Echo 144 MHz"]
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=== VHF+ Sample Files
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=== Tips for EME
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Sample recordings typical of QSOs using the VHF/UHF/Microwave modes
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and features of _WSJT-X_ are available for
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<<DOWNLOAD_SAMPLES,download>>. New users of the VHF-and-up features
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are strongly encouraged to practice decoding the signals in these
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files.
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The following tutorial aims to familiarize you with program features
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of particular interest for EME and other extreme weak-signal
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conditions. As a starting point, configure _WSJT-X_ as follows:
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.Settings | General:
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- *My Call* = W9XYZ
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- Check these boxes: *Enable VHF/UHF/Microwave features*, *Single
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decode*, *Decode after EME delay*
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.Settings | Advanced:
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- *Random erasure patterns* = 7, *Aggressive decoding level* = 0,
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*Two-pass decoding* = _unchecked_, *Waterfall spectra* = _Most sensitive_
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.Main window menus:
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- *View* = Message averaging
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- *Mode* = JT65
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- *Decode:* *Deep* selected, *Enable averaging* checked,
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*Enable deep search* unchecked, *Enable AP* checked
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.Main window:
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- *F Tol* = 500, *Rx* 1500 *Hz*, *Submode* = B, *Sync* = 0
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- *DX Call*, *DX Grid:* both empty
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.Wide Graph:
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- *Bins/Pixel* = 3, *N Avg* = 10
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- Adjust the width of the window so that the frequency range extends
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up to at least 2400 Hz.
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If you have not already done so, install the sample files available
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for <<DOWNLOAD_SAMPLES,download>>. Select *File | Open* and navigate
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to ...\save\samples\JT65\JT65B\000000_0001.wav.
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The waterfall should look something like the snapshot below. A barely
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visible vertical trace appears at 1300 Hz. This is the synchronizing
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tone of a simulated JT65B signal with SNR = -26 dB.
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image::EME_Deep_0.png[align="center",alt="EME_Deep_0"]
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The decoder recognizes the sync tone of a JT65 signal, but is unable
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to decode it, producing only this line in the _Single Period Decodes_
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panel:
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0001 -28 2.5 1300 #*
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Press *F6* repeatedly, to read subsequent files. When
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five files have been read your display should look like this:
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image::EME_Deep_1.png[align="center",alt="EME_Deep_1"]
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The message `CQ K1ABC FN42` appears in the _Average Decodes_ panel,
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flagged with the <<Decoded_Lines,end-of line label>> `f3`. The label
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means that decoding was accomplished with the Franke-Taylor
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algorithm, using the average or 3 transmissions.
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The _Message Averaging_ window now looks like this:
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image::EME_Deep_2.png[align="center",alt="EME_Deep_2"]
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The `$` symbols mark lines corresponding to transmissions used in the
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most recent attempt toward an average decode.
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Hit the *F6* key again to read the sixth file. You should now see the
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message `K1ABC G4XYZ IO91` displayed in the _Average Decodes_ panel,
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again with the `f3` label.
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Now pretend you are K1ABC (enter `K1ABC` and `FN42` as *My Call* and
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*My Grid* on the *Settings | General* tab). Click *Clear Avg* and
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double-click *Erase* to start with a fresh screen. Open the files
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000000_0002.wav and 000000_0004.wav. You should now see the message
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`K1ABC G4XYZ IO91` in the _Average Decodes_ panel. Its end-of-line
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flag `a22` indicates that this decode used *My Call* as _a priori_
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(AP) information of type 2 (see Table 1 in <<AP_Decoding,AP
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Decoding>>), and is based on the average of 2 transmissions.
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You might wish to experiment with other combinations of entries for
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*My Call*, *DX Call*, and *DX Grid*, and with toggling the various
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options of the *Decode* menu on and off.
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