Digital Dispatch Systems MDT

Digital Dispatch Systems MDT

Frequencies	152 MHz,854.7875 MHz
Frequency Range	152 MHz - 854.7875 MHz
Mode	NFM
Modulation	PSK
ACF	—
Emission Designator	—
Bandwidth	8 kHz
Location	United States
Short Description	Digital Dispatch Systems Mobile Data Terminal is a dispatching system used by taxi and private transportation companies.
I/Q Raw Recording	Download file
Audio Sample

Digital Dispatch Systems MDTMobile Data Terminal, A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, commercial trucking fleets, military logistics, and emergency vehicles, such as police cars, to communicate with a central dispatch office. is a dispatching system used by taxi and private transportation companies. Data transmitted on this data link include MDTMobile Data Terminal, A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, commercial trucking fleets, military logistics, and emergency vehicles, such as police cars, to communicate with a central dispatch office. usage, credit card information (encrypted), GPS location, and general dispatching activities. Uses a 4800 bpsBits per second (bps) QPSKQuadrature Phase-Shift Keying (2 bits per symbol) signal running at 2400 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. When idle (no data transmitting), it repeats a ~43Bd idle pattern. Data can be heard in very short bursts.

Samples

NFMNarrowband Frequency Modulation	USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)

Additional Samples

152 MHzMegaHertz (MHz) 10^6 Hz in Milwaukee.

Frequencies

Reported to be in the 150 MHzMegaHertz (MHz) 10^6 Hz band, the 400 MHzMegaHertz (MHz) 10^6 Hz band, and the 800 MHzMegaHertz (MHz) 10^6 Hz band. One notable user is London Towncars Inc in New York City. They are the first licensed chauffeured transportation company in New York City. FCC record

Additional Links

• Digital Dispatch
• Digital Dispatch Systems (DDS) 4800 bps QPSK - Taxi MDT Protocol

Additional Images

Spectrum of DDS MDTMobile Data Terminal, A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, commercial trucking fleets, military logistics, and emergency vehicles, such as police cars, to communicate with a central dispatch office.