Larry wrote:
"plano" wrote in
:

If averaged over 10 minutes or so, maybe 4800 would offer enough
bandwidth in certain locations, but you just cannot risk that say 20
(long) AIS sentences are received more or less simultaneously. There
is no way 4800 baud (1/8th!! of 38400) will handle that. Any idea
how much traffic one can expect say in the English Channel? It's the
worst case scenario that counts, not the average in Charleston harbor.
plano



You can watch the Irish Sea:
http://www.aisliverpool.org.uk/index.php
Finest AIS system on the internet.

But, of course, YOUR AIS isn't this good. Your range is about 10-12
miles with a 50' antenna listening to these 12W transmitters. This
limited range limits the number of AIS packets you must process in your
small system. That in itself reduces the load considerably.


If you think Liverpool, UK is a busy shipping area I suggest you think
again. Think English Channel, Shanghai, Rotterdam, Singapore for
"slightly" busier areas.

Also, range at see that I get is a LOT better than 20 km... The big guys
tend to have their antenna's pretty high up! (My AIS antenna is a Metz
Manta-6 whip mounted 2 m above sea level.)

--
Kees