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[aprssig] APRS Message workarounds

Jason KG4WSV kg4wsv at gmail.com
Thu Jan 17 22:59:11 UTC 2008


Right, got all that.  I make my living in part at (mostly wired) networking;
I understand basic practical and theoretical aspects.  Going back to your
original post:

1) Never try to message beyond 1 or 2 hops reliably.
>
> 2) Recognize that your message had 2 to 4 times higher chance of
> getting through then you will ever see in getting an ACK back.
>

You are making rather emphatic statements about how APRS works, based on the
assumption that P=.5 .  My question is: how accurate is that assumption?
 Has there been any network analysis, or any mathematical analysis (perhaps
based on or related to the APRS Aloha circle formula) to verify or support
this assumption?

I'm not arguing that it's wrong - intuitively, it sounds about right to me -
but assumptions should be backed up, when design choices or operating
methods are based on that assumption.

-Jason
kg4wsv
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