<div dir="ltr"><div>Scheduling and callsigns. and APRS-IS load</div><div><br></div><div>Yes, once we know the volunteer high power TX stations, I uess we will just assign them one of the 4 slots. If there are more, then we can separate the 4 slots into regions. THinkiong is that if say there are 4 stations in the USA NW, SE, SW, NW, then they beam (if they have it) back to any big pupulated region about 500 miles away. there were some sucesses with omnis too.</div><div><br></div><div>And the only stationjs that need special software are the few TX stations.</div><div><br></div><div>It does not make sense to beam to the middle of the coutry because there is not a density of APRS receivers there. Remember none of this will show up on the APRS-is since the packet will always be captured on the first local xmission. Useless data. So pick a dense populated APRS area bout 400-600 miles away.</div><div><br></div><div>But the APRS-IS will be loaded. WIll this bring it down? Or will the first packet frame in the 15 second burst go into an IGAte and all the rest will be ignored as dupe? In that case it is only one packet per minute per TX station? But wait, Every packet will be identical so they will all be dupes after the first. So does this make it OK for the APRSIS?</div><div><br></div><div>The reason for being on 144.39 is so that no one but the TX stations have to do anything. Just look at their logs in the morning.</div><div><br></div><div>We can have 15 TX stations as METEOR-1 through METEOR-15. More by changing the spelling somewhat.</div><div><br></div><div>I thought about the problem of using a KWD radio for RX with only 100 slots in the station list. If that cycles through in some busy areas due to local activity, then the meteor might drop off the bottom. But recently I notice traffic os down, especially if mormal people only use 2 hops.</div><div><br></div>Easy to test. Run your radio overnight and see the date/times of all stations in the lisrt and see if it didnt cycle to the bottom in the hours from midnight to say 8 AM?<div><br></div><div>Bob<br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 11, 2020 at 11:26 AM spam8mybrain via aprssig <<a href="mailto:aprssig@lists.tapr.org">aprssig@lists.tapr.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Greetings.
<div><br></div><div>Could you clarify what this meteor mode is? I'm not sure I understand, between your email and the webpages.</div><div><br></div><div>Please correct my interpretation:</div><div><br></div><div>The station sends repeated back-to-back APRS status packets using Maidenhead grid locators as fast as it can for 15 seconds, then listens for 45 seconds, basically using timeslotting with a 1-minute cycle and 4 slots.</div><div><br></div><div>Which part of North America gets which timeslot?</div><div><br></div><div>If I can get this clarified, I might be able to get a meteor-mode-capable build of YAAC out the door by the end of the week.</div><div><br></div><div>Andrew, KA2DDO</div><div>author of YAAC</div><br><br>-------- Original message --------<br>From: Robert Bruninga <<a href="mailto:bruninga@usna.edu" target="_blank">bruninga@usna.edu</a>> <br>Date: 11/11/20 04:05 (GMT-05:00) <br>To: TAPR APRS Mailing List <<a href="mailto:aprssig@lists.tapr.org" target="_blank">aprssig@lists.tapr.org</a>> <br>Subject: [aprssig] APRS Meteor Scatter test! <br><br><div dir="ltr"><div dir="ltr"><div dir="ltr">With the Leonids Meteor shower coming up in a week After Midnight next Monday (Tues AM), maybe its time to have some fun with APRS again!<div><br></div><div>Last time we did this was 1998 and over 48 MS packets were seen over 500 to 600 miles on the APRS channel.. Here is the report: <a href="http://aprs.org/APRS-docs/LEONIDS.TXT" target="_blank">http://aprs.org/APRS-docs/LEONIDS.TXT</a></div><div><br></div><div>THis year I propose not a free-for-all but just a few HIGH power stations transmitting and everyone else in the country checks the next morning to see what they copied.. Best TX stations are those with several hundred watts and a beam. Even one such station would be a great test, because on 144.39 we would have maybe 10,000 receivers. I dont have the power nor the beam</div><div><br></div><div>So first, do we have any such stations? And then We can further organize the test.</div><div><br></div><div>But it would go something like this. Say 4 TX stations around the country would TX a continuous keydown string of short packets for 15 seconds. Then the next, and so on till the minute is up and then start again. Xmission is on 144.39 national channel to maximize the number of people that might copy one. Transmissions begin at midnight and runs to 6 AM. We all wake up the next morning to see what we got. Yes, this will burn the local channel within about 20 miles of the TX station. but since the packets have no path, they can only be heard in simplex range of a transmitter and everyone is sleeping anyway.</div><div><br></div><div>But if a meteor happens, someone will likely capture it. Remember, our own APRS stations these days only hears a packet say once ever 3 or 4 seconds and that gives everyone a receive window of 75% of the total slots available. And even if the 4 TX stations are not even synchronized it doesnt matter because a given meteor path only exists for a fraction of a second and only between two fixed 100 mile or so areas for that instant.</div><div><br></div><div>The original APRSdos had Meteor Mode built in and did the timing and transmissions. WIth a very short packet and short TXD a single key down could transmit about 30 packets during each 15 second period.</div><div><br></div><div>Any stations?</div><div>Oh, here is the original page: <a href="http://aprs.org/meteors.html" target="_blank">http://aprs.org/meteors.html</a></div><div>Look about 75% down the page for the map of that 2m experiment.</div><div><br></div><div>IGNORE the majority of that page. It was showing how an emergency response station for example could go to an area of total devastation with all APRS wiped out, and with enough power and persistence could likely get out an emergency email message.</div><div><br></div><div>Bob, WB4APR</div></div></div></div>
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