ACARS monitoring

I’m trying to get a handle on the amount of traffic that there is on the various many ACARS channels that seem to be in use. In a previous post, I counted 20 channels and that information was from a few different sources.

So i pointed the output of acarsdec to a text file, and let it capture almost 82k messages over the 7.6 day period from 4 Jun to today. Due to the maximum instantaneous bandwidth limitations of acarsdec and the RTL-SDR dongle, I decided to focus on the following

130.025 130.425 130.450 130.825 131.125 131.425 131.550
71.8% 0.0% 0.2% 0.0% 0.0% 0.0% 27.8%
49621 20 172 18 2 31 19211
4.54 0.00 0.02 0.00 0.00 0.00 1.76

As can be seen, the vast majority of ACARS messages on the 7 channels scanned over that 7.6 day period are on only 2 channels, 130.025 and 131.550. Row 1 is the channel frequency, row 2 the percentage of messages received on that channel, row 3 the absolute message count for that channel, and row 4 the average messages per minute on that channel.

Now I’ll change the channels and do another run to see if there is more activity elsewhere.

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