mirror of https://github.com/saitohirga/WSJT-X.git
118 lines
5.0 KiB
Plaintext
118 lines
5.0 KiB
Plaintext
// Status=review
|
||
.Main Window:
|
||
- Select *JT9+JT65* on the *Mode* menu.
|
||
- Toggle the *Tx mode* button to read *Tx JT65*, and set the Tx and Rx
|
||
frequencies to 1718 Hz.
|
||
- Double-click on *Erase* to clear both text windows.
|
||
|
||
.Wide Graph Settings:
|
||
|
||
- Set *Bins/Pixel* = 7
|
||
- Adjust the width of the Wide Graph window so that the upper
|
||
frequency limit is approximately 4000 Hz.
|
||
|
||
.Open a Wave File:
|
||
|
||
- Select *File | Open* and navigate to +...\save\samples\130610_2343.wav+.
|
||
The waterfall should look like this:
|
||
|
||
//.130610_2343.wav Decode
|
||
[[X14]]
|
||
image::130610_2343-wav-80.png[align="left",alt="Wide Graph Decode 130610_2343"]
|
||
|
||
IMPORTANT: Notice the [blue]*BLUE* marker on the waterfall scale, here
|
||
set at 2500 Hz. Its position is set by the spinner control *JT65 nnnn
|
||
JT9*, where nnnn is a frequency in Hz. In *JT9+JT65* mode the program
|
||
will automatically decode JT9 signals only above this frequency.
|
||
|
||
JT9 signals appear in the *Cumulative* spectrum as nearly rectangular
|
||
shapes about 16 Hz wide. They have no clearly visible sync tone like
|
||
the one at the low-frequency edge of all JT65 signals. By convention
|
||
the nominal frequency of both JT9 and JT65 signals is taken to be that
|
||
of the lowest tone, at the left edge of its spectrum.
|
||
|
||
This sample file contains 17 decodable signals — nine in JT65 mode
|
||
(flagged with the character # in the decoded text windows), and eight
|
||
in JT9 mode (flagged with @). On multi-core computers the decoders
|
||
for JT9 and JT65 modes run simultaneously, so their results will be
|
||
interspersed. The *Band Activity* window contains all decodes (you
|
||
might need to scroll back in the window to see some of them). A
|
||
signal at the frequency specified by the green marker is given
|
||
decoding priority, and its message is displayed also in the *Rx
|
||
Frequency* window.
|
||
|
||
[[FigDecodes]]
|
||
image::decodes.png[align="center"]
|
||
|
||
- Confirm that mouse-click behavior is similar to that described
|
||
earlier, in <<TUT_EX1,Example 1>>. _WSJT-X_ automatically determines
|
||
the mode of each JT9 or JT65 message.
|
||
|
||
IMPORTANT: When you double-click on a signal in the waterfall it will be
|
||
properly decoded even if on the "`wrong`" side of the *JT65 nnnn JT9*
|
||
marker. The Tx mode automatically switches to that of the decoded
|
||
signal and the Rx and Tx frequency markers on the waterfall scale
|
||
resize themselves accordingly. When selecting a JT65 signal, click on
|
||
the sync tone at its left edge.
|
||
|
||
- Double-click on the waterfall near 815 Hz: a JT65 message
|
||
originating from W7VP will be decoded and appear in the *Rx Frequency*
|
||
window. Between the *UTC* and *Freq* columns on the decoded text line
|
||
you will find *dB*, the measured signal-to-noise ratio, and *DT*, the
|
||
signal's time offset in seconds relative to your computer clock.
|
||
|
||
[width="80%",align="center",cols="^10,2*^8,2*^10,54",options="header"]
|
||
|===
|
||
|UTC|dB|DT|Freq|Mode|Message
|
||
|+2343+|+-7+|+0.3+|+815+|+#+|+KK4DSD W7VP -16+
|
||
|===
|
||
|
||
- Double-click on the waterfall at 3196 Hz. The program will decode a
|
||
JT9 message from IZ0MIT:
|
||
|
||
[width="80%",align="center",cols="^10,2*^8,2*^10,54",options="header"]
|
||
|===
|
||
|UTC|dB|DT|Freq|Mode|Message
|
||
|+2343+|+-7+|+0.3+|+3196+|+@+|+WB8QPG IZ0MIT -11+
|
||
|===
|
||
|
||
- Scroll back in the *Band Activity* window and double-click on the
|
||
message +CQ DL7ACA JO40+. The program will set *Tx mode* to JT65 and Tx
|
||
and Rx frequencies to that of DL7ACA, 975 Hz. If you had checked
|
||
*Double-click on call sets Tx Enable* on the *Setup* menu, the program
|
||
would configure itself to start a QSO with DL7ACA.
|
||
|
||
- Double-click on the decoded JT65 message +CQ TA4A KM37+. The program
|
||
will set Tx mode to JT9 and the Rx and Tx frequencies to 3567 Hz. The
|
||
program is now configured properly for a JT9 QSO with TA4A.
|
||
|
||
.Reopen the First Sample File:
|
||
- Select *File | Open* and navigate to +...\save\samples\130418_1742.wav+.
|
||
|
||
Taking full advantage of the wide-band, dual-mode capability of
|
||
_WSJT-X_ requires a receiver bandwidth of at least 4 kHz. These
|
||
data were recorded with a much narrower Rx bandwidth, roughly 200 to
|
||
2400 Hz. If you have no Rx filter wider than about 2.7 kHz, you will
|
||
be using data like this. For best viewing, adjust *Bins/Pixel* and the
|
||
width of the Wide Graph so that only the active part of the spectrum
|
||
shows, say 200 to 2400 Hz. Re-open the example file after any change of
|
||
*Bins/Pixel* or Wide Graph width, to refresh the waterfall.
|
||
|
||
The signals in this file are all JT9 signals. To decode them
|
||
automatically in *JT9+JT65* mode you’ll need to move the *JT65 nnnn JT9*
|
||
delimiter down to 1000 Hz or less.
|
||
|
||
.Waterfall Controls
|
||
|
||
Now is a good time to experiment with the *Start* control and the
|
||
sliders controlling gain and zero-point of the waterfall and spectrum
|
||
plots. *Start* determines the frequency displayed at the left side of
|
||
the waterfall scale. Sliders set the baseline level and gain for the
|
||
waterfall and the several types of spectra. Good starting values
|
||
should be close to mid-scale. You might want to uncheck *Flatten*
|
||
when adjusting the sliders. Re-open the wave file after each change,
|
||
to see the new results.
|
||
|
||
IMPORTANT: When finished with this Tutorial, don’t forget to re-enter
|
||
your own callsign as *My Call* on the *Settings | General* tab.
|