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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5505 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
118 lines
5.1 KiB
Plaintext
118 lines
5.1 KiB
Plaintext
// 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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- Set *Bins/Pixel* = 7
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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\130610_2343.wav+.
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The waterfall should look like this:
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//.130610_2343.wav Decode
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[[X14]]
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image::images/130610_2343-wav-80.png[align="left",alt="Wide Graph Decode 130610_2343"]
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IMPORTANT: Notice the [blue]*BLUE* marker on the waterfall scale, here
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set at 2500 Hz. Its position is set by the spinner control *JT65 nnnn
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JT9*, where nnnn is a frequency in Hz. In *JT9+JT65* mode the program
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will automatically decode JT9 signals only above this frequency.
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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 in the *Rx Frequency*
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window.
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[[FigDecodes]]
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image::images/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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IMPORTANT: 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="70%",cols="3,^3,^3,^4,^4,30",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="70%",cols="3,^3,^3,^4,^4,30",options="header"]
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|=====================================
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|UTC|dB|DT|Freq|Mode|Message
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|+2343+|+-7+|+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 Tx
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and Rx frequencies to that of DL7ACA, 975 Hz. If you had checked
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*Double-click on call sets Tx Enable* on the *Setup* menu, the program
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would configure itself to start a QSO with DL7ACA.
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- Double-click on the decoded JT65 message +CQ TA4A KM37+. The program
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will set Tx mode to JT9 and the Rx and Tx frequencies to 3567 Hz. The
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program is now configured properly for a 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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.Start, Zero, and Gain
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Now is a good time to experiment with the *Start*, *Zero*, and *Gain*
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parameters. *Start* determines the frequency displayed at the left
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side of the waterfall scale. *Zero* sets the baseline level for
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colors, and *Gain* sets the sensitivity for color changes. For the
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receiver setup of this file good values are close to *Zero*=0,
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*Gain*=0. You may want to uncheck *Flatten* when adjusting the *Zero*
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and *Gain* controls. Re-open the wave file after each change, to see
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the new results.
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IMPORTANT: When finished with this Tutorial, don’t forget to re-enter
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your own callsign as *My Call* on the *Settings | General* tab.
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