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The funny thing is, now the problem has stopped happening. So I don't know if the offending digipeaters went off the air or what. I'm trying to see if there is a way to identify receive overrun, as it currently isn't reported. But it was very strange when it
was happening, as I would see one mangle within a second of the original beacon, and the second (different) mangle about 20 to 30 seconds later.
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-------- Original message --------<br>
From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb@homeside.to> <br>
Date:10/22/2014 10:57 (GMT-05:00) <br>
To: TAPR APRS Mailing List <aprssig@tapr.org> <br>
Subject: Re: [aprssig] Garbled echo-back caused multiple beacons <br>
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<div class="x_moz-cite-prefix">Are you sure it's the digipeater and not your own reception? If your TNC is in PASSALL (if it has such a mode) or if you have any overruns or parity errors on the serial line between the TNC and your system, this behavior can
occur.<br>
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It may be happening on other packets, but we typically only look at our own raw packets.<br>
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Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32<br>
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On 10/22/2014 10:12 AM, Andrew P. wrote:<br>
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<blockquote type="cite">Greetings, all.
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<div>I just had a weird "feature" with my station. I periodically run a 2-way I-gate for testing purposes, and found that APRS-IS was showing mangled copies of my beacon. Turns out the problem was that I was receiving mangled digipeats of my own beacon over
RF, and, because the packet checksum didn't match, my station was I-gating the mangled packets immediately after the original "clean" packet was sent to APRS-IS.</div>
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<div>Unfortunately, the mangling digipeaters didn't have tracing turned on, so I don't know who was chewing my packets. </div>
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<div>Should my station protect itself from such behavior by not digipeating or I-gating any traffic whose original sender's callsign-SSID matches my station's callsign-SSID?</div>
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<div>Andrew, KA2DDO </div>
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