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[aprssig] Mystery packet

Andrew Rich vk4tec at tech-software.net
Thu Dec 10 15:48:38 UTC 2009

thank you

----- Original Message ----- 
From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb at homeside.to>
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Sent: Thursday, December 10, 2009 11:39 PM
Subject: Re: [aprssig] Mystery packet

> Pete Loveall AE5PL Lists wrote:
>> So, bottom line is the TNC that was used to receive this packet indicated 
>> all digi'ed bits in the text representation of the packet which is 
>> perfectly acceptable as there is no monitor format in the AX.25 spec. 
>> The spec describes the link protocol, not the presentation of that 
>> information.
> The only thing not mentioned in this thread so far is that the AX.25
> packets on the air actually HAVE the "Used" bits set on ALL of the
> leading stations in the path.  It is only the humanly-readable format
> that sometimes (most of the time) suppresses the earlier ones and only
> puts the * on the last packet in the path to have been marked "used".
> This drove me nuts the first time I tried to interpret raw KISS packets
> (barely wrappered AX.25)  and thought my program was buggy due to all of
> the *s I was seeing.
> Lynn (D) - KJ4ERJ
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> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig


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