ARQ-M4-242

ARQAutomatic Repeat reQuestAutomatic Repeat Query-M Series: ARQ-M2-242 - ARQ-M2-342 - ARQAutomatic Repeat reQuestAutomatic Repeat Query-M4-242 - ARQ-M4-342 

ARQ-M4-242

Frequencies	3 MHz,30 MHz
Frequency Range	3 MHz - 30 MHz
Mode	USB
Modulation	FSK
ACF	—
Emission Designator	—
Bandwidth	250 Hz
Location	Worldwide
Short Description	ARQ-M4-242 (Also known as TDM 242, TDM-4, 192-TDM, and ARQ-56) is a four-channel time division multiplexed telex system. This is the CCIR 242 standard version. Used in Aeronautical, Maritime, and Point-to-Point services.
I/Q Raw Recording	—
Audio Sample

ARQAutomatic Repeat reQuestAutomatic Repeat Query-M4-242 (Also known as TDM 242, TDM-2, 96-TDM, and ARQAutomatic Repeat reQuestAutomatic Repeat Query-28) is a four-channel time division multiplexed telex system. This is the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 242 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. This mode has been used by Chinese, Vietnamese and Spanish embassies, along with some French Military Forces stations.

ARQAutomatic Repeat reQuestAutomatic Repeat Query-M stands for Automatic Repeat reQuest, Multiplex, and as such, has a time-division based multiplex of two channels using ITA-3 7-bit encoding. FSKFrequency-Shift Keying shift of 170 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)..

Uses 87 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 96 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 172 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 192 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., or 200 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second..

Decoding Software

Professional Equipment/Software

• go2DECODE
• go2MONITOR
• Wavecom W-Code
• Wavecom W-Spectra
• Rohde&Schwarz CA100

Additional Links

• Wikipedia ARQ-M
• RadioRaft ARQ-M4
• scancat Digital modes
• numbersoddities Info
• shoc Database: ARQ-M4-242
• WAVECOM Database: ARQ-M4-342 and ARQ-M4-242