[aprssig] APRS Meteor Scatter test!
w2ev at yahoo.com
Wed Nov 11 08:47:37 EST 2020
In years-gone-by, my station logged many, many others using this method. In fact, I wrote an article for QST (with one crucial setting omitted that munged alot but there was still a boatload of successes)...including a nice catch from Rochester, MN to my place in Rochester, NY! :-)
That was when the continent was divided into 4 quarters, each having a 15-second TX interval assigned and everyone in that region TX'd at the same time.
This approach is an interesting variation. Is there an APRS desktop client with meteor mode and no TNC requirement (soundcard only)? My station is being rebuilt but I (and others) may be able to cobble something together quickly. Maybe. :-)
On Wednesday, November 11, 2020, 4:06:28 AM EST, Robert Bruninga <bruninga at usna.edu> wrote:
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!
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: http://aprs.org/APRS-docs/LEONIDS.TXT
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
So first, do we have any such stations? And then We can further organize the test.
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.
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.
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.
Any stations?Oh, here is the original page: http://aprs.org/meteors.htmlLook about 75% down the page for the map of that 2m experiment.
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.
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