[amsat-bb] when are TLE's too old to use?

[Gregory Beat]

????
Clint,
I have been working satellites since Oscar 6, when I was in high school.
Worked STS-9 (Owen Garriott, Spacehab-1) when I was in graduate college.

No need for education or evangelizing. 
73.

greg, w9gb
AMSAT-NA, AMSAT-UK
Sent from iPad Air

> 
> On May 17, 2018, at 8:43 PM, Clint Bradford <clintbrad4d at earthlink.net> wrote:
> 
> If you are working the ISS (fruitless right now), I would update every week, because 
> they re-position themselves a couple times a month. NOTHING drastic, but that is 
> where the slight difference is from week-to-week.
> 
> And since you’re updating already, snag ‘em all (grin).
> 
> If not working the ISS - every couple weeks or up to a month is fine.
> 
> Clint K6LCS
> http://www.work-sat.com
> 909-999-SATS