General Information
The Nordic Mobile Telephone standard NMT-450 is an analog mobile telephone system developed by Telecommunications Administrations of Denmark, Finland, Norway and Sweden.
Usage:
§ Public mobile phone network on UHF (450 MHz, 900 MHz with some restrictions).
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FFSK |
|
|
Shift (Hz) |
600 |
|
|
Symbol rate (Bd) |
1200 |
|
|
Coding |
Convolutional FEC |
|
Demodulator Settings |
Demodulator |
(G)MSK |
|
|
Type |
MSK |
|
|
Symbol rate (Bd) |
1200 |
|
|
SR tolerance (Bd) |
100 |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal’s frequency range | |
Table 19: NMT450
Figure 17: NMT450 Spectrogram