[aprssig] Error checking within APRS packets

Guido Trentalancia iz6rdb at trentalancia.com
Thu Jun 23 12:42:32 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.
> 73
> Bill - WA7NWP


Guido IZ6RDB

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