Contestia

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OLIVIA based Modes: Olivia - Contestia - RTTYM - PAX - VOICE
Contestia
Contestiathmb.png
Frequencies 3 MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
,30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
3,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
- 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation MFSKMultiple Frequency Shift-Keying
ACF
Bandwidth 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.15 kHzKiloHertz (kHz) 10^3 Hz
1.5e-4 MHzMegaHertz (MHz) 10^6 Hz
,250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.25 kHzKiloHertz (kHz) 10^3 Hz
2.5e-4 MHzMegaHertz (MHz) 10^6 Hz
,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.5 kHzKiloHertz (kHz) 10^3 Hz
5.0e-4 MHzMegaHertz (MHz) 10^6 Hz
,1000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).kHzKiloHertz (kHz) 10^3 Hz
1.0e-3 MHzMegaHertz (MHz) 10^6 Hz
,2000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).kHzKiloHertz (kHz) 10^3 Hz
0.002 MHzMegaHertz (MHz) 10^6 Hz
0.15 kHzKiloHertz (kHz) 10^3 Hz
1.5e-4 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.002 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description Contestia, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance.
I/Q Raw Recording
Audio Sample
Contestia, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance.

Contestia performs very well under weak signal conditions. It decodes below the noise level but Olivia still outperforms it in this area by about 1.5 - 3db depending on configuration. Despite this, Contestia performs twice as fast as Olivia comparatively (e.g. Contestia 8/250 is twice as fast as Olivia 8/250). Contestia uses a block size of 32 where Olivia uses a block size of 64. Contestia also uses a modified alphabet that's 6-bit encoded.

Contestia Submodes[edit]

125, 250, 500, 1000, and 2000 are the available bandwidths. 4, 8, 16, 32, 64, 128, and 256 are the available tones. There are a total of 40 possible submodes.

Contestia's submodes are determined by bandwidth and number of tones. This is represented with the "Contestia X/Y" or "Contestia X-Y" format, where X = # of tones and Y = Bandwidth in HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).. Y/X is also alternatively used. E.g: Contestia 8-250 = 8/250 = 250/8 = 8 tones, 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). bandwidth.

The standard Contestia submodes (bandwidth/tones) are 4/125, 8/250, 16/500, 32/1000, and 64/2000.

The most commonly used submodes are 4/125, 4/250, 4/500, 8/250, 8/500, and 16/500.

Possible Submodes
blue = Standard
green = Non-Standard Common Modes
2/125 4/125 8/125 16/125 32/125 64/125 128/125 256/125
2/250 4/250 8/250 16/250 32/250 64/250 128/250 256/250
2/500 4/500 8/500 16/500 32/500 64/500 128/500 256/500
2/1000 4/1000 8/1000 16/1000 32/1000 64/1000 128/1000 256/1000
2/2000 4/2000 8/2000 16/2000 32/2000 64/2000 128/2000 256/2000

Mode Characteristics[edit]

  • 8-250: "Slow" 8 tones, bandwidth=250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=31.25 bauds, 29.2 wpm, lowest S/N=-13 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.,
  • 16-500: "Average" 16 tones, bandwidth=500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=31.25 bauds, 39 wpm, lowest S/N =-12 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.,
  • 32-1000: ("Standard" default mode) 32 tones, bandwidth=1000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=31.25 bauds, 48.8 wpm, lowest S/N =-12 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.,
  • 8-500: "Normal" 8 tones, bandwidth=500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=62.5 bauds, 58.6 wpm, lowest S/N =-10 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.,
  • 16-1000: "Fast" 16 tones, bandwidth=1000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=62.5 bauds, 78.2 wpm, lowest S/N =-9 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.,
  • 4-500: "Fast 2" 4 tones, bandwidth=500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=125 bauds, 78.2 wpm, lowest S/N =-8 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal..
  • 4-250: "Average 2" 4 tones, bandwidth=250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=62,5 bauds, 39 wpm, lowest S/N =-10 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal..
  • 8-1000: "Very fast" 8 tones, bandwidth=1000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=125 bauds, 117 wpm, lowest S/N =-5 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal..

Samples[edit]

Contestia Modes
4/125 4/250 4/500
Contestia 4-125.png
Contestia 4-250.png
Contestia 4-500.png

8/250 8/500 16/500
Contestia 8-250.png
Contestia 8-500.png
Contestia 16-500.png

Decoding Software[edit]

Hobby Level Software

Additional Links[edit]

Additional Images[edit]