<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>To clarify exactly what a high power TX station needs to send is say 30 copies of the APRS grid format in a single burst IE send this to the TNC every minute:</div><div><br></div><div>>GG##gg<CR></div><div><div>>GG##gg<CR></div><div>>GG##gg<CR></div></div><div>>GG##gg<CR><br></div><div>...</div><div><div>>GG##gg<CR></div><div>>GG##gg<CR></div></div><div><br></div><div> The TNC will concatenate probably seven to ten of these at a timel into dense packets with only a single TX delay, not 30 delays. </div><div><br></div><div>The TNC has UNPROTO set to simply "APRS" no path! And set to CONVErSE..</div><div><br></div><div>Adjust the number (30?) till the TX burst lasts 15 seconds each minute.</div><div>The result is a complete grid in only 200 milliseconds each. Hopefully short enough so that occasionally one will get bounced somewhere by the extremely short meteor path bursts at VHF. </div><div><br></div><div>Point beam to a high ham population density at least 600 miles away. Vertical or Horizontal will work.</div><div><br></div><div>This will take special software for the 15 TX stations. (METEOR-1 through METEOR-15)</div><div><br></div><div>RX stations need nothing special. Any APRS software should capture and decode and plot a grid report if received overnight. All of this on the national channel 144.39 from midniight to 6 AM local time</div><div><br></div><div>Here is the report form 1998 event</div><div> <a href="http://aprs.org/APRS-docs/LEONIDS.TXT" target="_blank">http://aprs.org/APRS-docs/<span class="gmail-il">LEONIDS</span>.TXT</a><br></div><div><br></div><div>Bob WB4APR</div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 12, 2020 at 5:06 PM GEO Badger <<a href="mailto:w3ab@yahoo.com" target="_blank">w3ab@yahoo.com</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><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:16px"><div><div dir="ltr">Actually, I can program my spare TNC, KPC 3+, to TX every X seconds for X time.</div><div><br></div><div>---<br> Ciao baby, catch you on the flip side<br>73 de W3AB/GEO<br><br>WA2LSI, KE6RJW, AAR9AG<br><br> <a href="http://www.w3ab.org" target="_blank">http://www.w3ab.org</a><br><br>You can say "over", you can say "out", you just can't say "over and out".</div></div>
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On Thursday, November 12, 2020, 01:39:04 PM PST, Robert Bruninga <<a href="mailto:bruninga@usna.edu" target="_blank">bruninga@usna.edu</a>> wrote:
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<div><div id="gmail-m_7630216999638856854gmail-m_-1996295880728082961ydpf94aa278yiv9096539999"><div><div dir="ltr">AMEN! Your location? Beam should point to high APRS population density about 600 miles away.<div><br clear="none"></div><div>Do you have APRS familiarity?</div><div>Though it is not required, bu will neet a PC program to send the 40 packets in 15 secs every minute,'</div><div>Hopefully someone will write it quickly.</div><div><br clear="none"></div><div>bOB</div></div><br clear="none"><div id="gmail-m_7630216999638856854gmail-m_-1996295880728082961ydpf94aa278yiv9096539999yqt21598"><div><div dir="ltr">On Thu, Nov 12, 2020 at 3:39 PM GEO Badger <<a shape="rect" href="mailto:w3ab@yahoo.com" rel="nofollow" target="_blank">w3ab@yahoo.com</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:Helvetica,Arial,sans-serif;font-size:16px"><div><div dir="ltr">I have 100W & 7 el beam. Will that meet the requirements?</div><div><br clear="none"></div><div>---<br clear="none"> Ciao baby, catch you on the flip side<br clear="none">73 de W3AB/GEO<br clear="none"><br clear="none">WA2LSI, KE6RJW, AAR9AG<br clear="none"><br clear="none"> <a shape="rect" href="http://www.w3ab.org" rel="nofollow" target="_blank">http://www.w3ab.org</a><br clear="none"><br clear="none">You can say "over", you can say "out", you just can't say "over and out".</div></div>
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On Thursday, November 12, 2020, 12:28:49 PM PST, Robert Bruninga via AMSAT-BB <<a shape="rect" href="mailto:amsat-bb@amsat.org" rel="nofollow" target="_blank">amsat-bb@amsat.org</a>> wrote:
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<div><div dir="ltr">We are seeking Amsat operators with beams and high power on VHF to<br clear="none"></div><div dir="ltr">participate in this coming Monday night's Leonids Meteor Shower APRS test.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">So far, no one on the APRS list seems to have any power and beams to be a<br clear="none"></div><div dir="ltr">transmitting station. If you have high power and a beam, you can help.<br clear="none"></div><div dir="ltr">Here is the pitch:<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">--------<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">With the Leonids Meteor shower coming up after Midnight next Monday (Tues<br clear="none"></div><div dir="ltr">AM), maybe its time to have some fun with APRS again!<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">Last time we did this was 1998 and over 48 MS packets were seen over 500 to<br clear="none"></div><div dir="ltr">600 miles on the APRS channel.. Here is the report:<br clear="none"></div><div dir="ltr"><a shape="rect" href="http://aprs.org/APRS-docs/LEONIDS.TXT" rel="nofollow" target="_blank">http://aprs.org/APRS-docs/LEONIDS.TXT</a><br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">THis year I propose not a free-for-all but just a few HIGH power stations<br clear="none"></div><div dir="ltr">transmitting and everyone else in the country checks the next morning to<br clear="none"></div><div dir="ltr">see what they copied.. Best TX stations are those with several<br clear="none"></div><div dir="ltr">hundred watts and a beam. Even one such station would be a great test,<br clear="none"></div><div dir="ltr">because on 144.39 we would have maybe 10,000 full time normal APRS stations<br clear="none"></div><div dir="ltr">as receivers. In retirement, i dont have the power nor the beam<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">But it would go something like this. Up to 15 TX stations around the<br clear="none"></div><div dir="ltr">country would TX a continuous keydown string of short packets for 15<br clear="none"></div><div dir="ltr">seconds every minute. Xmission is on the 144.39 national APRS channel to<br clear="none"></div><div dir="ltr">maximize the number of people that might copy one. Transmissions begin at<br clear="none"></div><div dir="ltr">midnight local time and runs to 6 AM only to minimize any interference to<br clear="none"></div><div dir="ltr">other operators. We all wake up the next morning to see what we got. Yes,<br clear="none"></div><div dir="ltr">this will burn the local channel within about 20 miles of the TX station.<br clear="none"></div><div dir="ltr">but since the packets have no path, they can only be heard in simplex range<br clear="none"></div><div dir="ltr">of a transmitter and everyone is sleeping anyway.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">But if a meteor happens, someone within about 400 to 600 miles is likely<br clear="none"></div><div dir="ltr">capture it. Remember, the APRS channel load in most areas is only a packet<br clear="none"></div><div dir="ltr">every 3 or 4 seconds and that gives everyone a receive window of 75% of the<br clear="none"></div><div dir="ltr">total slots available. And even if the TX stations are not even<br clear="none"></div><div dir="ltr">synchronized it doesnt matter because a given meteor path only exists for a<br clear="none"></div><div dir="ltr">fraction of a second and only between two fixed 100 mile or so areas for<br clear="none"></div><div dir="ltr">that instant.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">The original APRSdos had Meteor Mode built in and did the timing and<br clear="none"></div><div dir="ltr">transmissions. WIth a very short packet and short TXD a single key down<br clear="none"></div><div dir="ltr">could transmit about 30 packets during each 15 second period.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">Any high power TX volunteeers?<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">Oh, here is the original page: <a shape="rect" href="http://aprs.org/meteors.html" rel="nofollow" target="_blank">http://aprs.org/meteors.html</a><br clear="none"></div><div dir="ltr">Look about 75% down the page for the map of that 2m experiment.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">IGNORE the majority of that page. It was showing how an emergency response<br clear="none"></div><div dir="ltr">station for example could go to an area of total devastation with all APRS<br clear="none"></div><div dir="ltr">wiped out, and with enough power and persistence could likely get out an<br clear="none"></div><div dir="ltr">emergency email message. This one time, test is completely different.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">Bob, WB4APR<br clear="none"></div><div dir="ltr">_______________________________________________<br clear="none"></div><div dir="ltr">Sent via <a shape="rect" href="mailto:AMSAT-BB@amsat.org." rel="nofollow" target="_blank">AMSAT-BB@amsat.org.</a> AMSAT-NA makes this open forum available<br clear="none"></div><div dir="ltr">to all interested persons worldwide without requiring membership. Opinions expressed<br clear="none"></div><div dir="ltr">are solely those of the author, and do not reflect the official views of AMSAT-NA.<br clear="none"></div><div dir="ltr">Not an AMSAT-NA member? Join now to support the amateur satellite program!<br clear="none"></div><div dir="ltr">Subscription settings: <a shape="rect" href="https://www.amsat.org/mailman/listinfo/amsat-bb" rel="nofollow" target="_blank">https://www.amsat.org/mailman/listinfo/amsat-bb</a><br clear="none"></div></div>
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