kopia lustrzana https://github.com/jamescoxon/dl-fldigi
69 wiersze
2.7 KiB
Plaintext
69 wiersze
2.7 KiB
Plaintext
/**
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\page contestia_page Contestia
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\tableofcontents
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Fldigi can operate on the following Contestia modes without special setup
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by the operator:
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<br>
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Mode | Symbole Rate \(Baud\) | Typing speed \(WPM\) | Bandwidth \(Hz\)
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:---------------: | :-----------: | :-----------: | :---------:
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Contestia 4-250 | 62.5 | ~ 40 | 250
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Contestia 8-250 | 31.25 | ~ 30 | 250
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Contestia 4-500 | 125 | ~ 78 | 500
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Contestia 8-500 | 62.5 | ~ 60 | 500
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Contestia 16-500 | 31.25 | ~ 30 | 500
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Contestia 8-1000 | 125 | ~ 117 | 1000
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Contestia 16-1000 | 62.5 | ~ 78 | 1000
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Contestia 32-1000 | 31.25 | ~ 48 | 1000
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Unusual combinations of symbol rate and bandwidth can be selected
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using the \ref contestia_configuration_page tab.
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<br>
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Contestia is a digital mode directly derived from Olivia that is not
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quite as robust - but more of a compromise between speed and
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performance. It was developed by Nick Fedoseev, UT2UZ, in 2005. It
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sounds almost identical to Olivia, can be configured in as many ways,
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but has essentially twice the speed.
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Contestia has 40 formats just like Olivia - some of which are
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considered standard and they all have different characteristics. The
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formats vary in bandwidth (125,250,500,1000, and 2000hz) and number of
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tones used (2,4,8,16,32,64,128, or 256). The standard Contestia formats
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(bandwidth/tones) are 125/4, 250/8, 500/16, 1000/32, and 2000/64.
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The most commonly used formats right now seem to be 250/8, 500/16, and
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1000/32.
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<br>
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Contestia performs very well under weak signal conditions. It handles
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QRM, QRN, and QSB very well also. It decodes below the noise level but
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Olivia still outperforms it in this area by about 1.5 - 3db depending
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on configuration.
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It is twice as fast as Olivia per configuration. It is an excellent
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weak signal, ragchew, QRP, and DX digital mode. When ragchewing under
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fair or better conditions it can be more preferable to many hams than
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Olivia because of the faster speed. For contests it might also be a
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good mode IF the even faster configurations such as 1000/8 or 500/4 are
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used.
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Contestia get it's increased speed by using a smaller symbol block size
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(32) than Olivia (64) and by a using 6bit decimal character set rather
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than 7bit ASCII set that Olivia does. Therefore, it has a reduced
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character set and does not print out in both upper and lower case (like
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RTTY). Some traffic nets might not want to use this mode because it
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does not support upper and lower case characters and extended
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characters found in many documents and messages. For normal digital
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chats and ham communications that does not pose any problem.
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<br>
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\ref contestia_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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