[aprssig] Draft Copy of Thesis on APRS

Bill Vodall wa7nwp at gmail.com
Tue Dec 9 18:42:14 EST 2014

There are several extended versions of KISS that deal with this...

> 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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