kopia lustrzana https://github.com/jamescoxon/dl-fldigi
104 wiersze
4.1 KiB
Plaintext
104 wiersze
4.1 KiB
Plaintext
/**
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\page fsq_configuration_page FSQ Configuration
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\tableofcontents
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\image html config-fsq.png ""
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\image latex config-fsq.png "" width=5.0in
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<br>
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\section fsq_rx_parameters Rx Parameters
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The FSQ decoder is essential a set of single frequency filters spaced by the interval
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samplerate / symbol_length, 2.93 Hz. The filters are achieved using a Fast Fourier Transform.
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Each spectral line (or bin) of the FFT is then filtered using a time domain filter called a
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moving average (boxcar) filter. The moving average filter is the optimum filter
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for locating a signal transition in the time domain. The moving average filter can
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be adjusted to average 1 to 4 samples. A setting of 1 disables the filter. The
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default value for the moving average filter is 3.
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The filtered spectral lines are then tested for maximum value. The Min Hits adjustment sets
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the number of consecutive times a spectral line is the maximum before being designated as
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a detected signal. Min Hits can be set over the range 3 to 6. The default value is 3.
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Images are detected by first converting the signal to a base band. This is accomplished
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by mixing a 1500 Hz sine wave with the rx stream. This is equivalent to an analog receiver
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that using direct conversion. The down converted signal can be filtered to reduce the
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effect of noise. Your choice is NONE, 300, 400 or 500 Hz for the low pass filter 6 dB
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cutoff frequency. Use the narrower filters for noisy conditions, but remember that filtering
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will both reduce the image noise and also blur the image.
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Callsigns that satisfy the parsing requirements will be added to the FSQ heard list.
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You can elect to have the heard list periodically managed so that older entries are removed or aged.
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The user can elect no aging, Never; or 1, 5 10, 20 minutes intervals for aging.
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\section fsq_tx_parameters Tx Parameters
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FSQ transmissions can occur ar 2, 3, 4.5, or 6 baud. The default rate is 4.5. The baud
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rate can be selected on the fsq configuration tab, or by left clicking on the left
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most entry on the fldigi main dialog status bar.
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FSQ "Sounding" is a periodic transmission of your call sign followed by a colon. The
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Sounding signal is a way of announcing your presence on the channel with the smallest
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possible data stream. Other FSQ stations will add you to their Heard list if they detect
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your Sounding signal. You set the Sounding interval to OFF, 1, 10 or 30 minutes.
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Your QTC text can be sent using the "QTC" button on the main dialog. It can also be
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requested for auto reply by another FSQ station.
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All FSQ transmissions are designed to be inhibited so long as the software detects
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a received signal (open squelch).
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\section fsq_logging Logging
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Any of the text in the Rx Panel or the Monitor Panel can be captured for copy, and
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saving to a file. Simply right click on the panel for a pop menu.
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Fldigi's FSQ also saves a continuous log of all Heard stations, and an Audit log that
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includes all received data. These logs are named fsq_heard_log.txt and fsq_audit_log.txt
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respectively. The logs are never cleared unless the operator does so using the operating
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system file handling facilities. Data is appended to each log as it occurs. These logs
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are located in the fldigi temp folder:
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<br>
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<center>
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<table>
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<tr>
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<td><kbd>XP</kbd></td>
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<td><kbd>C:\\Documents and Settings\\\<username\>\\fldigi.files\\temp</kbd></td>
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</tr>
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<tr>
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<td><kbd>Vista</kbd></td>
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<td><kbd>C:\\Users\\\<username\>\\fldigi.files\\temp</kbd></td>
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</tr>
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<tr>
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<td><kbd>Win7</kbd></td>
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<td><kbd>C:\\Users\\\<username\>\\fldigi.files\\temp</kbd></td>
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</tr>
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<tr>
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<td><kbd>Win8</kbd></td>
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<td><kbd>C:\\Users\\\<username\>\\fldigi.files\\temp</kbd></td>
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</tr>
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<tr>
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<td><kbd>Linux</kbd></td>
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<td><kbd>/home/\<user\>/.fldigi/temp</kbd></td>
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</tr>
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<tr>
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<td><kbd>OS X</kbd></td>
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<td><kbd>/home/\<user\>/.fldigi/temp</kbd></td>
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</tr>
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<tr>
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<td><kbd>Unix</kbd></td>
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<td><kbd>/home/\<user\>/.fldigi/temp</kbd></td>
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</tr>
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</table>
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</center>
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You can elect to disable the logging functions. You may also rename the log to suit
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your particular operations.
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<br>
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\ref fsq_configuration_page "Return to Top of Page"
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<br>
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\ref main_page "Return to Main Page"
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*/
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