[aprssig] "Emergency!" test convention?
KC2MMi kc2mmi at verizon.netWed Jul 21 14:07:07 UTC 2004
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Bob, either I've missed something when reading the APRS specs, or there's a glaring omission in them. It would seem that there is no test period specified for actually testing an APRS unit beaconing the "Emergency!" status. What I mean by this, is that many distress systems put aside five minutes every hour, and during that five minute period anyone that needs to test a system--test it under actual conditions--is free to do so. Stations receiving the emergency beacon will ignore it during that period. The purpose is simple, there's really no way to test emergency beacons without activating them and of course, one can't just do that at random without calling wolf. So may I suggest adding a small point to the APRS spec? From two and half minutes before the hour, to two and a half minutes after the hour, every hour, that five minute period be set aside for emergency beacon tests. Any signal received in that window will be treated as a test to be ignored. Any signal continuing after that period, or sent before it, would be treated as a real emergency signal of course. (If there is a different quiet period, i.e. from the hour to five past, that you'd prefer to synchronize with, I don't mind at all.) The alternative is bringing equipment into a faraday cage or sticking a can over the antenna, etc, and none of that quite allows everything to be tested as it really will deploy--including reception in the APRS system. Or, as I said, did I miss something and is this already addressed? Jared
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