RTTYM

RTTYM
Frequencies	3 MHz,30 MHz
Frequency Range	3 MHz - 30 MHz
Mode	USB
Modulation	MFSK
ACF	—
Emission Designator	—
Bandwidth	150 Hz,250 Hz,500 Hz,1000 Hz,2 kHz
Location	Worldwide
Short Description	RTTYM, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. RTTYM is about 4x faster than Olivia, but trades the speed for reduced robustness and sensitivity.
I/Q Raw Recording	—
Audio Sample

OLIVIA based Modes: Olivia - Contestia - RTTYM - PAX - VOICE

RTTYM, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. RTTYM is about 4x faster than Olivia, but trades the speed for reduced robustness and sensitivity.

Compared to Olivia, RTTYM has +3 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. minimum signal to noise ratio compared to Olivia. RTTYM uses a block size of 16 where Olivia uses a block size of 64. RTTYM uses a slightly modified RTTY Baudot 5-bit alphabet encoding.

RTTYM 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.

RTTYM's submodes are determined by bandwidth and number of tones. This is represented with the "RTTYM X/Y" or "RTTYM 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: RTTYM 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 RTTYM submodes (bandwidth/tones) are 4/125, 8/250, 16/500, 32/1000, and 64/2000.

The most commonly used submodes right now are 8/125, 4/250, 8/250, 4/500, 8/500, 16/500, 8/1000, 16/1000 and 32/1000.

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, 58 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.,
16-500: "Average" 16 tones, bandwidth=500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=31.25 bauds, 78 wpm, lowest S/N =-10.5 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.,
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, 97 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.,
8-500: "Normal" 8 tones, bandwidth=500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=62.5 bauds, 117 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.,
16-1000: "Fast" 16 tones, bandwidth=1000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=62.5 bauds, 156 wpm, lowest S/N =-7.5 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.,
4-500: "Fast 2" 4 tones, bandwidth=500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=125 bauds, 156 wpm, lowest S/N =- 6 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, 78 wpm, lowest S/N =-8.5 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.,
8-1000: "Very fast" 8 tones, bandwidth=1000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., speed=125 bauds, 234 wpm, lowest S/N =-3 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..