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ace8f6418e
bad data. 2. Fix a bug that could allow a Koetter-Vardy false decode instead of a valid Berlekamp-Massey decode, sometimes leading to program crash. 3. Many more edits in the User's Guide, *.adoc files. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3664 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
98 lines
3.8 KiB
Plaintext
98 lines
3.8 KiB
Plaintext
// Status=review
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.Wide Graph Settings:
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- *Bins/Pixel* = 7
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- *Zero* = -3
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- Adjust the width of the Wide Graph window so that its upper
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frequency limit is approximately 4000 Hz.
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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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.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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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 @).
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... Figure here showing text windows ...
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Since the Tx mode was set to *Tx JT65*,
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signals in that mode were decoded first. If you had selected *Tx JT9*,
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JT9 signals would have been decoded first.
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TIP: Notice the [blue]*BLUE* marker on the waterfall scale, by default
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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 JT65 signals below this frequency and JT9
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signals above it.
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- Confirm that mouse-click behavior is similar to that described
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<<X13,above>>, in Example 1. The program automatically determines the
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mode of each JT9 or JT65 signal.
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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.
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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 and the program will decode a JT9
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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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TIP: Notice that when a signal is decoded in this way, the Tx mode
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automatically switches to that of the decoded signal and the Rx and Tx
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frequency markers on the waterfall scale resize themselves
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accordingly.
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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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These data were recorded with a much narrower Rx bandwidth, roughly
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200 to 2600 Hz. If you have no Rx filter wider than about 2.7 kHz, you
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will be using data like this. For best viewing, adjust *Bins/Pixel*
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and the width of the Wide Graph so that only the active part of the
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spectrum shows, say 0 to 2600 Hz. Re-open the example file after any
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change of *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 in
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JT9+JT65 mode you’ll need to move the JT65 nnnn JT9 delimiter down to
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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
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*Gain* parameters. *Start* sets the starting frequency 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 *Zero*=0, *Gain*=0.
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Re-open the wave file after each change, to see the new results.
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