General Information
Mobitex-1200 is a wireless packet switched data network found on 70 MHz in Sweden. MOBITEX-1200 was the first MOBITEX standard and is similar to MOBITEX-8000 above the ROSI link-layer. Sweden closes down the service since 2012 step by step. It is unknown whether the service is still active in some areas.
Usage:
Transfer of textual information over VHF (mostly Taxi, Ambulance)
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FFSK |
|
|
Number of tones |
2 |
|
|
Bandwidth (Hz) |
15000 |
|
|
Symbol rate (Bd) |
1200 |
|
|
Coding |
ECC: Short Cyclic Block Code(69,48) |
|
Demodulator Settings |
Demodulator |
FSK 2,3,4 discr. |
|
|
Symbol rate (Bd) |
1200 |
|
|
SR tolerance (Bd) |
10 |
|
|
Modulation order |
2 |
|
|
Shift (Hz) |
600 |
|
|
Shift Tolerance |
150 |
|
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 15: MOBITEX-1200
Figure 13: MOBITEX-1200 Spectrogram