Nordic Mobile Telephone (NMT)

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Nordic Mobile Telephone (NMT)
NMT.jpg
Frequencies 450 MHz
Frequency Range 450 MHz - 450 MHz
Mode NFM
Modulation FSK
ACF
Bandwidth 25 kHz
Location Worldwide
Short Description Nordic Mobile Telephone (NMT, NMT-450, and NMT-900) is a first generation analog cell phone system. Originally designed for and by Nordic countries (Finland, Sweden, Norway, Denmark) it was widely deployed around the world. Nowadays (as of 2015) NMT is defunct.
I/Q Raw Recording
Audio Sample

Nordic Mobile Telephone (NMT, NMT-450, and NMT-900) is a first generation analog cell phone system. Originally designed for and by Nordic countries (Finland, Sweden, Norway, Denmark) it was widely deployed around the world, for example in Saudi Arabia, Russia and Switzerland. It was completely automatic and allowed for users to roam freely in participating countries. Nowadays (as of 2015) NMT is defunct.

Voice is transmitted as NFMNarrowband Frequency Modulation, data as FSKFrequency-Shift Keying. Data rate is 1200 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., with mark/space frequencies of 1200/1800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)..

Samples[edit]


Frequencies[edit]

NMT-450[edit]

Downlink frequencies (from base station to mobile station): 463.00 to 467.50 MHzMegaHertz (MHz) 10^6 Hz

Uplink frequencies (from mobile station to base station): 453.00 to 457.50 MHzMegaHertz (MHz) 10^6 Hz

Channel width: 25 kHzKiloHertz (kHz) 10^3 Hz


NMT-900[edit]

Downlink frequencies (from base station to mobile station): 935 to 960 MHzMegaHertz (MHz) 10^6 Hz

Uplink frequencies (from mobile station to base station): 890 to 915 MHzMegaHertz (MHz) 10^6 Hz

Channel width: 25 kHzKiloHertz (kHz) 10^3 Hz

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