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