kopia lustrzana https://github.com/jamescoxon/dl-fldigi
76 wiersze
2.3 KiB
Plaintext
76 wiersze
2.3 KiB
Plaintext
/**
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\page thor_page Thor
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\tableofcontents
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Thor is a new forward error correcting incremental frequency shift keyed
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communications mode. It was developed specifically to meet the needs of ARQ
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transfers in the HF spectrum. It is particularly well suited under
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conditions of atmospheric static noise. Thor borrows from two current modem
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technologies, \ref mfsk_page "MFSK" and \ref domino_ex_page "DominoEX".
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<br>
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Thor emits a distinctive double rising tone sequence at the
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beginning of each transmission. It is used to flush the receive
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decoder and also provides a visual and audible clue to its being used.
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<br>
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The modem code for Thor uses a wide band multiple frequency
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detector that can lock on and detect the incoming signal even when
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badly mistuned. Frequency domain oversampling is used to allow
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proper tone detection without the need for AFC. The AFC control does
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not alter the decoder in any way.
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<br>
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The waterfall and digiscope will appear as:
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<br>
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\image html Thor-1.png "Thor"
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\image latex Thor-1.png "Thor" width=6.0in
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<br>
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The text displayed in the status area is the secondary text being sent by the
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transmitting station. When the keyboard buffer is empty the Thor modem
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transmits text from the secondary text buffer. Your secondary text buffer
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can be edited on the Thor configuration tab.
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<br>
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The digiscope display is similar to the DominoEX display and represents the
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tone pairs moving through the tone filters. You can also use an alternate
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digiscope display (left click on the digiscope display area).
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<br>
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\image html dominoex-1a.png "DominoEx"
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\image latex dominoex-1a.png "DominoEx" width=1.0in
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<br>
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In this display mode the red line represents the center of the multiple
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tone bins that are in the detector. The dots will be blurry if the AFC is
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not locked on and become very distinct when AFC lock has been achieved. The
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tone dots will move from bottom to top (opposite the direction of the
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waterfall).
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<br>
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This is the same signal mistuned:
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<br>
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\image html dominoex-2.png "DominoEx Mistuned"
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\image latex dominoex-2.png "DominoEx Mistuned" width=6.0in
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<br>
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and with the signal badly mistuned:
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<br>
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\image html dominoex-3.png "DominoEx Mistuned 2"
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\image latex dominoex-3.png "DominoEx Mistuned 2" width=6.0in
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<br>
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<br>
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\ref thor_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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