This location is decoded and displayed on the Wacars graphic map display as shown below. The ACARS system is used to free up some of the duties of the flight crew as many functions are automated with occasional TX of data “Squitters” indicating location of the aircraft by Latitude & Longitude. N2uhc describes the acars operation below better than I could so is presented below as the original website is defunct.ĪCARS, or Aircraft Communications Addressing & Reporting System, is a VHF Band AM Signal in digital mode bursts known as “Squitters” for civilian and military aircraft to report various in flight information. The frequencies used are different for various continents so you need to RX on the correct frequency in the VHF Band on AM Amplitude Modulation with NO Squelch on.Īustralia uses 131.550 AM and the coverage can be up to 500 miles with good conditions on VHF considering the aircraft can be at 35000 + feet.īeing close to the Ham 2 meter Band on 148 Mhz it gives a good indication of current propagation on that Amateur Band ACARS Aircraft Monitoring on VHF Band with Radio Scanner and Personal Computer.Īll commercial Aircraft use ACARS on VHF for data TX/RX to ground stations worldwide.
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