RFNM Campaign Round 2 Now Open…<\/a><\/p>\n\n\n\n Explore More with DragonOS…<\/a><\/p>\n\n\n \n\t\t\t\t\t\tSubscribe<\/a>\n\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n\n\n Trains use more than just stoplight signaling to report status and relay information. Head-of-Train (HOT), End-of-Train (EOT), and Distributed Power Units (DPU) are the names of radio telemetry signals that trains emit to monitor \u201cbrake status and accidental separation information to the head locomotive\u201d (Artemis). These signals emit from trains roughly every 40 seconds but will immediately send a signal if an accident occurs. The Association of American Railroads (AAR) assigned the frequency 457.9375 MHz to these signals, but some rail companies use different frequencies such as Norfolk Southern\u2019s 161.115 MHz. You can read more about EOT in Robert McGonigal\u2019s blog post on Trains.com<\/a> or directly from the AAR<\/a>. Shown below is the EOT signal\u2019s profile in Artemis, which has recently been patched to v4.0.5<\/a> from v4.0.3.<\/p>\n<\/div>\n\n\n\n Cemaxecuter released a video nearly a year ago<\/a> covering decoders such as SoftEOT<\/a> for Windows (note you must join the group before you can download the software) and PyEOT<\/a> for Linux. bkerler updated the old flowgraph for PyEOT to comply with GNU Radio 3.10.X<\/a>. Thankfully it did not involve a rewrite of the decoder itself! The next helpful open-source contribution would be creating a proper GNU Radio Out-of-Tree module for PyEOT to decode train packets within GNU Radio itself. Currently, PyEOT requires that the user runs a flowgraph to demodulate FSK before running a Python script to decode the demodulated packets from GNU Radio.<\/p>\n In the post below, you can see the output of PyEOT running with the new GNU Radio 3.10.X flowgraph. Thanks bkerler for the contribution!<\/p>\n<\/div>\n\n\n\n
\n\n\n\nHighlight of the Week: Decoding End-of-Train (EOT) Packets<\/h2>\n\n\n\n
![\"\"](\"https:\/\/cemaxecuter.com\/wp-content\/uploads\/2024\/07\/eot-1024x705.png\")
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