kopia lustrzana https://github.com/jamescoxon/dl-fldigi
96 wiersze
3.1 KiB
Plaintext
96 wiersze
3.1 KiB
Plaintext
/**
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\page rtty_fsk_configuration_page RTTY / FSK Configuration
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\tableofcontents
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\image html config-rtty-rx.png "RTTY RX"
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\image latex config-rtty-rx.png "RTTY RX" width=5.0in
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<br>
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\image html config-rtty-tx.png "RTTY TX"
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\image latex config-rtty-tx.png "RTTY TX" width=5.0in
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<br>
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\image html config-rtty-synop.png "RTTY SYNOP"
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\image latex config-rtty-synop.png "RTTY SYNOP" width=5.0in
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<br>
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Fldigi operates RTTY using AFSK and the transceiver set to USB. The
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RTTY signal can be transmitted anywhere within the USB passband of the
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transceiver.
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<br>
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You can select from various Shifts, Bauds, Bits, Parity and Stop Bits
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for both AFSK and FSK keying of the transmitter. You can elect to
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have fldigi automatically insert a CFLF when it reaches character 72 on
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a line. You can also have it insert a CR-CR-LF sequence instead
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of the standard CR-LF sequence. This is very useful if you are
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communicating with someone using a hardware TTY printer. The
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extra carriage return will give the physical device time to move to the
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left margin before new characters arrive.
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<br>
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The RTTY decoder maintains an internal AFC system for tracking the
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desired signal. Depending on operating conditions you may need to
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adjust the action of the AFC loop. Select from the Slow, Normal
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or Fast AFC loop. You can also disable AFC with the AFC button on
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the main panel.
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<br>
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The received signal processing consists of a tuned Raised Cosine Filter
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followed by an optimized Automatic Threshold Correcting (ATC)
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detector. The resulting bit stream is then processed to extract
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the byte data.
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<br>
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\image html config-rtty-classic-scope.png "Classic RTTY XY Scope"
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\image latex config-rtty-classic-scope.png "Classic RTTY XY Scope" width=1.5in
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<br>
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\image html config-rtty-pseudo-scope.png "Pseudo Signal XY Scope"
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\image latex config-rtty-pseudo-scope.png "Pseudo Signal XY Scope" width=1.5in
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<br>
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The Digiscope display can be defaulted to the X-scope or the Signal
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scope.
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<br>
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The classic XY-scope is similar to older hardware scopes that show
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the output of the separate Mark-Space filters, one applied to the horizontal
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and one to the vertical axis.
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<br>
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The Pseudo XY-scope is similar with the exception that the horizontal
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and vertical are phase related to the Mark-Space signals, but not the
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actual signal.
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<br>
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The Classis XY-scope will appear noisier than the Pseudo XY-scope.
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<br>
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PseudoFSK selection generates an additional audio signal on the right
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channel. This signal is a burst tone at the FSK keying rate.
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You can full wave rectify and filter the signal so that it can be
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used as the FSK keyline signal to a rig that supports FSK transmissions.
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See \ref pseudo_fsk_page "Pseudo FSK" for additional information and a
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suitable keying circuit.
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<br>
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Your log can record either the center frequency between the Mark and
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Space or the Mark frequency. You can also select the color that
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should distinguish the Mark frequency.
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\image html config-rtty-synop.png "RTTY SYNOP"
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\image latex config-rtty-synop.png "RTTY SYNOP" width=5.0in
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<br>
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See \ref synop_page "Synop" and \ref rtty_page "RTTY" for additional information.
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<br>
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\ref rtty_fsk_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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