Fwd: Re: [aprssig] APRS routing strategies (3-3 or 2-2?)
Robert Bruninga bruninga at usna.eduFri Feb 18 00:31:51 UTC 2005
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>>> henk.de.groot at hetnet.nl 2/17/05 6:00:46 PM >>> Robert Bruninga schreef: > Absolutely he should! He should be using 3 if he > needs to go 3 hops and he should never use > 5 as he will QRM too much area... >How does the user know he needs 3 hops while driving >down the highway where sometimes he needs 1 and >sometimes he needs 4 hop to hit an IGATE. Very simple. *** We assume he is a Ham and has at least a clue about VHF radio range. ***Then he looks around him. If he sees Mountains then he knows that other fellow hams who cannot resist mountains has probably installed an APRS digipeater on one of them. And if so, then the range might be 50 miles or more. If not, then the range might be 20 miles or less. *** Then this same sentient being also knows whether he is 20, 50, 100, or 300 miles from the nearest city. *** Since almost EVERY city in the USA has APRS and at least one IGate, then he can do the mental math of whether 1 hop, 2 hops or 3 hops will probably get him to the Internet (if that is his objective). *** If he is so cluless about the range of his VHF radio, he probably shouldnt be licensed to use it. If he is so clueless about where he is, he should look at a map... If he is so clueless how to think these things together, and is just an internet appliance operator, then he can always look at the very nice dummy map we have put together for him on the New n-N Paradigm web page: http://www.ew.usna.edu/~bruninga/aprs/usamapfu.gif where it is obvious to the most casual observer what path is probably appropriate where... >Even if he could read it from a front pannel and punching >it in while doing 60 mph, by the time he activates it the >value is already obsolete. Its a big country. I'd say that 80% of its AREA is safe for WIDE4-4. I'd say that 90% of it is safe for WIDE3-3 and 100% of it is safe for WIDE2-2. On a five day drive from New York to LA on Interstate you might have to change your path twice. In NY CIty, start with WIDE2-2 to be gentlemenly with your use of spectrum. THen 3 hours later in PA, switch to WIDE3-3. Then 2000 miles later and 5 days later shift to WIDE2-2 as you enter LA. This is really not rocket science... de Wb4APR, Bob
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