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 HFamateur radio bands.
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
Latencyedit
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.
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]
mt63, digital, radio, modulation, mode, transmission, high, noise, situations, developed, pawel, jalocha, call, sign, sp9vrc, primarily, keyboard, keyboard, conversations, amateur, radio, bands, spectrogram, modulation, contents, description, latency, media, a. 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 Spectrogram of MT63 1K Modulation Contents 1 Description 2 Latency 3 Media 4 See also 5 References 6 Related linksDescription editMT63 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 2K00J2DENLatency editMT63 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 lt 1Media edit nbsp A sample MT63 transmission source source The text Welcome to Wikipedia the free encyclopedia that anyone can edit sent as MT63 1K Problems playing this file See media help nbsp A sample MT63 transmission source source 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 editWalsh code Varicode Radioteletype Shortwave radio PSK63References edit VOA Radiogram MT63 Modes Wide Area Time Service with Extended Features Related links edit MT63 Technical Information ZL1BPU website archived 2008 MT63 ZL1BPU website archived 2008 BARTG site British Amateur Radio Teledata Group Fldigi MT63 MT63 mooted as a time transfer technology Retrieved from https en wikipedia org w index php title MT63 amp oldid 1214494736, wikipedia, wiki, book, books, library,
