WSJT-X/doc/source/tutorial-example2.adoc

// Status=review
.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.

.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.

.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::images/130610_2343-wav-80.png[align="left",alt="Wide Graph Decode 130610_2343"]

TIP: Notice the [blue]*BLUE* marker on the waterfall scale, here
set at 2400 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 JT65 signals below this frequency and JT9
signals above it.

JT9 signals appear in the *Cumulative* spectrum as nearly
rectangular shapes about 16 Hz wide.  Although there is no clearly
visible sync tone like the one at the low-frequency edge of JT65
signals, by convention the nominal frequency of a JT9 signal is taken
to be that of its 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 @).  The *Band Activity* window should
contain these decodes (you may need to scroll back in the window to
see them all):

// ... Figure here showing the text windows ?
[[FigDecodes]]
image::images/decodes.png[align="center"]

Since the Tx mode was set to *Tx JT65*, signals in that mode were
decoded next.  If you had selected *Tx JT9*, JT9 signals would have
been decoded first.

- Confirm that mouse-click behavior is similar to that described
<<X13,earlier>>, in Example 1. The program automatically determines
the mode of each JT9 or JT65 signal.  

TIP: 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.

[width="70%",cols="3,^3,^3,^4,^4,30",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="70%",cols="3,^3,^3,^4,^4,30",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
2600 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 0 to 2600 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.

.Start, Zero, and Gain

Now is a good time to experiment with the *Start*, *Zero*, and *Gain*
parameters.  *Start* determines the frequency displayed at the left
side of the waterfall scale.  *Zero* sets the baseline level for
colors, and *Gain* sets the sensitivity for color changes.  For the
receiver setup of this file good values are close to *Zero*=0,
*Gain*=0.  Re-open the wave file after each change, to see the new
results.