At 07:28 AM 3/13/2011, Bob Bruninga wrote: >Toyo san, > >A few more ideas. It is easy to manually estimate ISS pass times >every day once you have heard a pass. >See: http://aprs.org/MobileLEOtracking.html > >1) ISS over Japan today is between about 0830 to 1830 JST. > >2) When you hear the first pass, then you will have additional >passes every 91 minutes or so that day. > >3) Each day a given GOOD pass is 23 minutes later. > >4) But overall-long-term pattern is moving earlier every other day >by 51 minutes. > >5) So in one week from now, the time window will be 0600 to 1600 > >6) The pass pattern is about the same. First 2 passes peak to the >SE, then NW. Then a low northern pass, then the last two passes are >NE and then SW. > >You can get EXACT pass times from http://heavens-above.com and >select a city. However, this web page does not show the 1 or 2 low >passes each day below 10 degrees elevation. > >The problem with using the ISS digipeater is that the survivors in >the devistated area do not know the frequency (145.825). One way to >solve this is to look for opportunity for someone to take a portable >digipeater on an airplane over devistated area. The new TH-D72 HT >can digipeat now! So have someone with a D72 catch a ride in an >aircraft one day. > >The D72 can BEACON on 144.64 a MESSAGE BULLETIN with info about the >ISS digipeater and the time-window. WHile it is aloft, it can also >act as a digipeater on Japanese APRS channel 144.64 and can also >capture a list of any APRS stations or mobiles on the air. > >The short bulletins might say something like this: > >TO: BLN1 >MSG: ISS Digi on 145.825 between 0830 to 1830 > >TO: BLN2 >MSG: Passes are 6 min long every 91 minutes > >TO: BLN3 >MSG: Every day, passes are 23 minutes later > >TO: BLN4 >MSG: Time window moves EARLIER 51m every 2 days > >Keep bulletins to under 45 characters to make sure that every radio >display can see the full bulletin (D7 screen limit).
All good suggestions except the last one. I think the road system is devastated as all the relief work has been by air in the severest hit areas. ~ Ed , KL7UW >But in small area like Japan, I think it might be easier just to try >to drive APRS mobiles (acting as digipeaters) to nearby hill tops on >144.64 normal APRS Japanese Frequency and keep everyone on same >frequency without confusion. > >Bob, WB4APR > >_______________________________________________ >Sent via [email protected]. Opinions expressed are those of the author. >Not an AMSAT-NA member? Join now to support the amateur satellite program! >Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep [email protected] ====================================== _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
