[aprssig] Draft Copy of Thesis on APRS

Curt Mills curt.we7u at gmail.com
Tue Dec 9 17:24:36 CST 2014

Regarding the checksum-on-KISS discussion (pages 25/26/27), there have
been cases where these things have happened:

*) RF from a local transmitter (could be vhf/uhf/hf) gets into the
serial cable and corrupts the packet.  Often we have to re-route
cables and put ferrites on EVERYTHING to keep the digital
communications running, particularly with 100W or more HF stations in
close proximity.  Serial cables make good antennas.

*) The PC has troubles keeping up with the incoming packets on its
UART, therefore drops a few characters.  Lack of a checksum can cause
corrupted KISS packets to be processed.

Curt, WE7U

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