[aprssig] Error checking within APRS packets
iz6rdb at trentalancia.com
Thu Jun 23 12:42:07 EDT 2011
Hi Bill !
On 21/06/2011 20:50, Bill V WA7NWP wrote:
>> corrupted packets.
> FWIW - Packets on the serial link between a KISS TNC and the PC are
> not generally CRC protected.
They are only protected by the parity bit used in the serial link.
However that is extremely weak.
> At one time I was running a long serial
> link to the TNC, about 50 feet, and running HF packet at the same
> time. It was a strange coincidence that I'd see garbage packets
> coming in when ever the HF was transmitting...
50 feet of unshielded cable, that makes a good receiving antenna for HF !
You are stretching the limits of things, that's why...
> I believe some of the more advanced KISS protocols would protect against this.
> Bill - WA7NWP
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