[aprssig] Re: APRS SSn-N Spec.
Stephen H. Smith
wa8lmf2 at aol.com
Thu Nov 29 18:58:49 EST 2007
Scott Miller wrote:
>> In the German APRS-Forum (http://www.amateurfunk.de/aprs/forum/) we
>> are currently discussing this issue.
>> To achieve a unique structure for SSn-N, we could use the country
>> codes defined in ISO 3166-1 and the subdivision codes defined in ISO
> Considering the size of some countries in Europe, is it even worth
> using the subdivisions? San Bernardino County is larger than
> Switzerland, and it doesn't rate its own SSn-N designator. California
> is larger than Germany and has (I think) two designators, mostly due
> to how long the state is in the N/S direction.
The point of the SSn-N paths is to limit the volume of APRS traffic to a
level below the Aloha overload threshold for a given network area. This
will be (approximately) determined by the absolute population (and
therefore the number of APRS hams) in a given region.
Since the population density of Europe is, on average, far higher than
most of the US, it makes sense to segment Euro SSn-N regions to areas
smaller than an entire nation, even though many nations are only the
size of many U.S. states.
Stephen H. Smith wa8lmf (at) aol.com
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