Aircraft Communications Addressing and Reporting System (ACARS)
ACARS data is used to send messages to and from commercial airlines' aircraft. A good explanation can be found here.
The frequencies used in the United States for ACARS are:
These frequencies may be used in some areas:
136.675 Delta and Jet Blue
136.775 Air Canada, Air Transat, American, Delta, JetBlue, United
For ACARS questions, please post them on the Aircraft Monitoring Forum.
- In general, all that is necessary to hook up a receiver and PC to receive ACARS is a good shielded connection from the speaker or earphone of the scanner to the soundcard. A discriminator tap is not required, since it is not involved in AM reception
- There's a brief sync tone sent before each transmission; if the software doesn't receive it, no decoding will occur. Most scanners' squelch cannot open up fast enough, so keep the squelch off. There are, however, a few scanners that do open up fast enough; these include:
Links in bold are known to be compatible with certain SDRs such as the RTL-SDR, either directly or piping audio via applications like Virtual Audio Cable
For other RTL-SDR solutions, see the Big List of RTL-SDR Supported Software. Some of the packages listed here may work with other SDRs