Contestia and RTTYM
Creator : Nick Fedoseev (UT2UZ) in 2005
Description : The Contestia and RTTYM modes are directly derived from the Olivia mode (Pawel Jalocha SP9VRC) but with a different compromise between speed and robustness
Block size (symbols) Contestia:32 RTTYM :16
Characters set : Contestia : bitschar -> decimal code
0 (idling) -> 0
Space -> 59
<CR> -> 60
CHR(33) à CHR(90)
->1 à 58
Multipsk specificity:
<BS> (key<---) -> 61
Small letters are transformed in capital letters
RTTYM: Same set of characters as for standard RTTY,except that the "letters" character is the CHR(0) instead the CHR(31) one
The idling character is the CHR(31) character.
Multipsk specificity:
<Bell> is coded as @ (second ' in Mixw)
For Contestia (terms "Slow"...qualify the sub-mode speed by comparison with the mean speed in Contestia):
* "8-250": "Slow" 8 tones, bandwidth=250 Hz, speed=31.25 bauds, 29.2 wpm, lowest S/N=-13 dB,
* "16-500": "Average" 16 tonalités, bandwidth=500 Hz, speed=31.25 bauds, 39 wpm, lowest S/N =-12 dB,
* "32-1K" ("Standard" default mode): 32 tonalités, bandwidth=1000 Hz, speed=31.25 bauds, 48.8 wpm, lowest S/N =-12 dB,
* "8-500": "Normal" 8 tonalités, bandwidth=500 Hz, speed=62.5 bauds, 58.6 wpm, lowest S/N =-10 dB,
* "16-1K": "Fast" 16 tonalités, bandwidth=1000 Hz, speed=62.5 bauds, 78.2 wpm, lowest S/N =-9 dB,
* "4-500": "Fast 2" 4 tonalités, bandwidth=500 Hz, speed=125 bauds, 78.2 wpm, lowest S/N =-8 dB
.
* "4-250": "Average 2" 4 tonalités, bandwidth=250 Hz, speed=62,5 bauds, 39 wpm, lowest S/N =-10 dB.
* "8-1K": "Very fast" 8 tonalités, bandwidth=1000 Hz, speed=125 bauds, 117 wpm, lowest S/N =-5 dB.
For RTTYM (terms "Slow"... qualify the sub-mode speed by comparison with the mean speed in RTTYM):
* "8-250": "Slow" 8 tones, bandwidth=250 Hz, speed=31.25 bauds, 58 wpm, lowest S/N=-12 dB,
* "16-500": "Average" 16 tonalités, bandwidth=500 Hz, speed=31.25 bauds, 78 wpm, lowest S/N =-10.5 dB,
* "32-1K" * "32-1K" ("Standard" default mode): 32 tonalités, bandwidth=1000 Hz, speed=31.25 bauds, 97 wpm, lowest S/N =-10 dB,
* "8-500": "Normal" 8 tonalités, bandwidth=500 Hz, speed=62.5 bauds, 117 wpm, lowest S/N =-9 dB,
* "16-1K": "16-1K": "Fast" 16 tonalités, bandwidth=1000 Hz, speed=62.5 bauds, 156 wpm, lowest S/N =-7.5 dB,
* "4-500": "Fast 2" 4 tonalités, bandwidth=500 Hz, speed=125 bauds, 156 wpm, lowest S/N =- 6 dB
.
* "4-250": "4-250": "Average 2" 4 tonalités, bandwidth=250 Hz, speed=62,5 bauds, 78 wpm, lowest S/N =-8.5 dB,
* "8-1K": "Very fast" 8 tonalités, bandwidth=1000 Hz, speed=125 bauds, 234 wpm, lowest S/N =-3 dB.
SUMMARY OF THE CHARACTERISTICS OF CONTESTIA AND RTTYM COMPARED TO OLIVIA
* CONTESTIA is a bit less sensitive than Olivia (+1.5 dB on minimum S/N). It is a also a bit less robust (due to a smaller block size) but it is twice more rapid (with a reduce set of characters). This mode is an excellent chat mode (because sensitive and rapid).
* RTTYM is a less sensitive than Olivia (+ 3 dB on minimum S/N). It is also less robust (due to a small block size and due to the RTTY problem of random shift from letters to figures or reversely, on an error) but it is almost four times more rapid (with the RTTY set of characters). This mode is interesting for very quick QSO.
