For everything other than the ISS and lower, weeks. For sats in 600km and higher, probably months if you are manual tuning and pointing.
YMMV.
73, Drew KO4MA
-----Original Message----- From: AMSAT-BB amsat-bb-bounces@amsat.org On Behalf Of Ron VE8RT Sent: Saturday, May 12, 2018 1:03 PM To: amsat-bb@amsat.org Subject: [amsat-bb] when are TLE's too old to use?
I understand that there won't be a good answer for how old can TLE's be before they're of no use. If you were going to be offline for an extended period, roughly, for a LEO, how long would you go before they're worthless?
Ron VE8RT
-- Ron VE8RT ve8rt@yknwt.ca _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb