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*Subject*: [amsat-bb] Hiker's Satellite Predictions*From*: "Robert Bruninga" <bruninga@xxxxxxxx>*Date*: Mon, 06 Feb 2006 15:25:45 -0500

>>> "Bruce Prior" <n7rr@hotmail.com> 02/06/06 11:13 AM >>> >... I will commence a ... trek on the Pacific Crest >National Scenic Trail (PCT)... I'm looking for a >"trail angel" to... provide me with regular >updates on APRS satellite passes and frequencies This is a good idea, but failing that, it is also easy to keep track of these satellites as long as you have a watch on your wrist and a pencil and notepad. I worked this up in great detail for each of the satellites and posted it on the AMSAT-BB several months ago, but cannot find it now. I made a table of these simple notes for each satellite: 1) The orbital period 2) For any given best pass on one day, how much earlier or later the SAME best pass would be each day. With those two numbers you can estimate passes well within the needs of APRS indefinately. For example. PCsat1 has a pass exactly 30 minutes earlier every day. And then once a week or so, you add 100 minutes to ratchet up a pass. The idea being, as long as you monitor a pass once every several days, and get a feel for the center of the pass, you can predict for the next several days just using addition. I sure wish I had kept a link to that little email... where I had worked all this up... For ISS it was something like 23 minutes earlier each day (long term) and 27 minutes or 63 minutes earlier each day... (not the right numbers, but you get the idea)... de Wb4APR, Bob ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

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