ARQ-M2-242

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

ARQ-M2-242

Frequencies	3 MHz,30 MHz
Frequency Range	3 MHz - 30 MHz
Mode	USB
Modulation	FSK
ACF	—
Emission Designator	—
Bandwidth	600 Hz
Location	Worldwide
Short Description	ARQ-M2-242 (Also known as TDM 242, TDM-2, 96-TDM, and ARQ-28) is a two-channel time division multiplexed telex system. This is the CCIR 242 standard version. Used in Aeronautical, Marine, and Point-to-Point services.
I/Q Raw Recording	—
Audio Sample

ARQAutomatic Repeat reQuestAutomatic Repeat Query-M2-242 (Also known as TDM 242, TDM-2, 96-TDM, and ARQAutomatic Repeat reQuestAutomatic Repeat Query-28) is a two-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 was commonly used by the French Military Forces.

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 430 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)..

Typically 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., or 200 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. An uncommon baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rate of 128.5 was seen on circuits between Papeete, Tahitti, and Mururoa.

Decoding Software

Professional Equipment/Software

• go2DECODE
• go2MONITOR
• Hoka Code 300-32
• Wavecom W-Code
• Wavecom W-Spectra
• Rohde&Schwarz CA100

Video Examples

Analysis and decoding ARQ M Signal (TDM Mode)

Additional Links

• Wikipedia ARQ-M
• RadioRaft ARQ-M2
• scancat Digital modes
• numbersoddities Info
• shoc Database: ARQ-M2-242
• WAVECOM Database: ARQ-M2-342 and ARQ-M2-242