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MT63

From Wikipedia, the free encyclopedia

Spectrogram of MT63-1K Modulation

MT63 is a digital radio modulation mode for transmission in high-noise situations. It was developed by Pawel Jalocha, call sign SP9VRC, primarily for keyboard-to-keyboard conversations on HF amateur radio bands.

YouTube Encyclopedic

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  • MT63 protocol on Amateur Radio - Ham HF

Transcription

Description

MT63 distributes the encoding of each character over a long time period, and over several tones. This code and symbol spreading implementation is key to its robustness under less than ideal conditions. The MT63 mode is very tolerant of mistuning; most software will handle 120 Hz tuning offsets under normal conditions.

Mode Symbol rate Typing speed Duty cycle Modulation Bandwidth ITU designation
MT63-500 5 baud 5.0 cps (50 wpm) 80% 64 × 2-PSK 500 Hz 500HJ2DEN
MT63-1000 10 baud 10.0 cps (100 wpm) 80% 64 × 2-PSK 1000 Hz 1K00J2DEN
MT63-2000 20 baud 20.0 cps (200 wpm) 80% 64 × 2-PSK 2000 Hz 2K00J2DEN

Latency

MT63 can use either a short or long interleaver. The long interleaver makes the mode more robust against interference, at the cost of increasing latency.

Mode ECC mode Latency (sec)
MT63 500 Hz short 12.8
MT63 1K short 6.4
MT63 1K long 12.8
MT63 2K short 3.2
MT63 2K long 6.4
PSK31 - <1

Media

A sample MT63 transmission
The text "Welcome to Wikipedia, the free encyclopedia that anyone can edit." sent as MT63-1K.
Problems playing this file? See media help.
A sample MT63 transmission
The text "Welcome to Wikipedia, the free encyclopedia that anyone can edit." sent as MT63-2LG.
Problems playing this file? See media help.

MT63 was used on shortwave by the VOA Radiogram until 2017,[1] but the software used to encode the text was not using the Varicode that MT63 used in its original design.

Modern software that supports MT63, such as Fldigi, uses base128,[2] essentially the same as ASCII.

MT63 has been promoted as a modulation format for time signal stations, but this system does not use Varicode.[3]

See also

References

  1. ^ "VOA Radiogram".
  2. ^ "MT63 Modes".
  3. ^ "Wide Area Time Service with Extended Features".

Related links

This page was last edited on 19 March 2024, at 08:55
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