MOBITEX-1200

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