General Information
Aircraft Communication Addressing and Reporting System (ACARS) is a digital data link system for exchange of small messages between aircraft and ground stations.
Usage:
§ Aeronautical communication over VHF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation, primary / secondary |
DSB-AM / MSK |
|
|
Shift (Hz) |
1200 |
|
|
Bandwidth (kHz) |
25 |
|
|
Symbol rate (Bd) |
2400 |
|
|
Coding |
CRC |
|
Demodulator Settings |
Demodulator |
G (MSK) |
|
|
Type |
MSK |
|
|
Symbol rate (Bd) |
2400 |
|
|
SR tolerance (Bd) |
2.000 |
|
|
BT |
1.0 |
|
|
Min. burst length (s) |
0.050 |
|
|
Max. burst length (s) |
2.000 |
|
|
Min. pause length (s) |
0.010 |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
yes |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the peak 20 kHz above the low cutoff-frequency of the signal. | |
|
Frequencies (MHz) |
129.125 USA & Canada 130.025 USA and Canada 130.425 USA 130.450 USA & Canada 131.125 USA 131.450 Primary channel for Japan 131.475 Air Canada company channel 131.525 Secondary Europe 131.550 Primary Channel worldwide 131.725 Primary channel in Europe 131.850 New Europe 136.700 Additional channel for USA 136.750 Additional channel for USA 136.750 New Europe 136.800 Additional channel for USA 136.850 SITA North American Frequency 136.900 Secondary Europe | |
Table 1: ACARS VHF
Figure 1: ACARS VHF Spectrogram