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<h1 style="text-align: center;">Psk Viewer</h1>
<br>
The psk viewer dialog can help to locate a signal of interest on a busy
band. The viewer can be visible at any time, but is only active
when fldigi is in one of the psk modes. Open the viewer by
clicking on the <span style="font-style: italic; font-weight: bold;">Viewer</span> menu item.<br><div style="text-align: center;"><img style="width: 576px; height: 376px;" alt="" src="images/pskviewer.png" hspace="5" vspace="5"><br></div>
<br>The psk viewer can decode up to
30 simultaneous signals. As each signal is acquired within a 100
Hz channel width it is printed on the associated line. The radio
frequency (or audio if fldigi is not operating with CAT) of the signal
is also shown on the line. The default behavior of the line of
text is to scroll in a marquee fashion after the line buffer becomes
full. The size of the line buffer is controlled by the width of
the display.<br>
<br>
You can enter any text you want to search for in the "Find:" widget.
This text can be a simple text snippit such as "CQ" or any
regular expression. <br>
<br>
With a regex you can specify a more generic pattern, which means that
you can match more things and your search is somewhat noise tolerant.
Here is an example for a CQ from a US station (should match most
callsigns):<br>
<br>
cq.+[aknw][a-z]?[0-9][a-pr-z][a-z]{1,2}<br>
<br>
This says "cq followed by at least one character, followed by one A,
K, N, or W, followed by an optional letter, followed by a digit,
followed by a letter that is not q, followed by one or two letters".
The search is case-insensitive.<br>
<br>
All plain text is a valid regular expression, unless you really had been
looking for these metacharacters:<br>
<br>
.[{()\*+?|^$<br>
<br>
These will have to be escaped with a backslash.<br>
<br>
If you left click on a line of received text the waterfall frequency is
adjusted to that value. The contents of the line of text is
transferred to the Rx text widget, and the main Psk loop begins to
track and decode that signal.<br><br><div style="text-align: center;"><a href="index.html">Contents</a></div></body></html>
