Psk Viewer

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. 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.   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): cq.+[aknw][a-z]?[0-9][a-pr-z][a-z]{1,2} 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. All plain text is a valid regular expression, unless you really had been looking for these metacharacters: .[{()\*+?|^$ These will have to be escaped with a backslash. 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.

The psk viewer is configured by the Psk tab on the modems configure menu item. Marquee style - ON scrolling text.  OFF the text clears when buffer is full. Show Frequencies - ON - audio / rf frequencies shown, OFF channel # shown. # Channels - selectable 5 to 30 - vertical size of viewer changes accordingly Start Frequency - lowest channel frequency Aging - # seconds of inactivity before a channel clears