ac4msite
 
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.
For 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 tones, bandwidth=500 Hz, speed=31.25 bauds, 39 wpm, lowest S/N =-12 dB,

* "32-1K" ("Standard" default mode): 32 tones, bandwidth=1000 Hz, speed=31.25 bauds, 48.8 wpm, lowest S/N =-12 dB,
* "8-500": "Normal" 8 tones, bandwidth=500 Hz, speed=62.5 bauds, 58.6 wpm, lowest S/N =-10 dB,
* "16-1K": "Fast" 16 tones, bandwidth=1000 Hz, speed=62.5 bauds, 78.2 wpm, lowest S/N =-9 dB,
* "4-500": "Fast 2" 4 tones, bandwidth=500 Hz, speed=125 bauds, 78.2 wpm, lowest S/N =-8 dB.
* "4-250": "Average 2" 4 tones, bandwidth=250 Hz, speed=62,5 bauds, 39 wpm, lowest S/N =-10 dB.
* "8-1K": "Very fast" 8 tones, bandwidth=1000 Hz, speed=125 bauds, 117 wpm, lowest S/N =-5 dB.

For RTTYM

* "8-250": "Slow" 8 tones, bandwidth=250 Hz, speed=31.25 bauds, 58 wpm, lowest S/N=-12 dB,
* "16-500": "Average" 16 tones, bandwidth=500 Hz, speed=31.25 bauds, 78 wpm, lowest S/N =-10.5 dB,
* "32-1K" * "32-1K" ("Standard" default mode): 32 tones, bandwidth=1000 Hz, speed=31.25 bauds, 97 wpm, lowest S/N =-10 dB,
* "8-500": "Normal" 8 tones, bandwidth=500 Hz, speed=62.5 bauds, 117 wpm, lowest S/N =-9 dB,
* "16-1K": "16-1K": "Fast" 16 ttones, bandwidth=1000 Hz, speed=62.5 bauds, 156 wpm, lowest
S/N =-7.5 dB,
* "4-500": "Fast 2" 4 tones bandwidth=500 Hz, speed=125 bauds, 156 wpm, lowest S/N =- 6 dB.
* "4-250": "4-250": "Average 2" 4 tonalitÚs, bandwidth=250 Hz, speed=62,5 bauds, 78 wpm, lowest S/N =-8.5 dB,
* "8-1K": "Very fast" 8 tonalitÚs, bandwidth=1000 Hz, speed=125 bauds, 234 wpm, lowest S/N =-3 dB.

* CONTESTIA is a bit less sensitive than Olivia (+1.5 dB on minimum S/N).

* RTTYM is a less sensitive than Olivia (+ 3 dB on minimum S/N).

- Not used hardly ever
- not many softwares support these modes
+Real good signal to noise ratio when using small bandwidths.
- slightly less senstive than Olivia
+Handle ionshperic effects fairly well especially in the wider bandwidths.












Mode Menu
CONTESTIA and RTTYM

FFT Screen Shot
Mode Audio Sample
contestia
VIDEO OF AN ACTUAL RTTYM QSO HERE