[amsat-bb] Simulate past passes in MacDoppler w/o changing OS date/time?

[John Brier]

I am also using old keps from spacetrack.
On Jun 18, 2016 4:49 PM, "Bryan KL7CN" <bryan at kl7cn.net> wrote:

> They would be incorrect, of course.
>
> I should elaborate -- I definitely used contemporaneous TLEs from the time
> period I needed.
>
> Thanks for bringing that up!
>
> -- bag
>
> Bryan KL7CN/W6
>
> On Jun 18, 2016, at 13:42, dave at g4dpz.me.uk wrote:
>
> Hi
>
> Not sure how the SGP4 algorithms will cope with old prediction if it is
> before the TLE reference date.
>
> 73
>
> Dave G4DPZ
>
> Sent from my iPhone
>
> > On 18 Jun 2016, at 21:23, Jim Jerzycke <kq6ea at verizon.net> wrote:
> >
> > GPredict does future passes quite well.
> >
> > If you go to the lower right box and click on the "down arrow" just to
> the left of the satellite name, it has an option to show future passes.
> >
> > 73, Jim  KQ6EA
> >
> >
> >> On 06/18/2016 08:00 PM, Bryan KL7CN wrote:
> >> It would be lovely to learn how to make MacDoppler do the same thing!
> >>
> >> I am sure that *enough* research would result in the same for GPredict.
> >>
> >> I was satisfied with Orbitron, so I left it at that. If it's enough for
> Captain Yuri...
> >>
> >> -- bag
> >>
> >> Bryan KL7CN/W6
> >>
> >> On Jun 18, 2016, at 12:57, John Brier <johnbrier at gmail.com> wrote:
> >>
> >> Yeah, I normally use Orbitron and it does this easily, but I'm
> >> travelling and all I have is a MacBook Pro. I guess I will virtualize
> >> windows so I can use Orbitron easily in the future.
> >>
> >> 73, KG4AKV
> >>
> >>> On Sat, Jun 18, 2016 at 3:34 PM, Bryan KL7CN <bryan at kl7cn.net> wrote:
> >>> After extensive research and experimentation, I was able to reliably
> handle past pass prediction using Orbitron.
> >>>
> >>> predict on the command line also works, but Orbitron is more flexible
> for day-to-day use with past passes.
> >>>
> >>> Orbitron is Windows-only, FYI.
> >>>
> >>> -- bag
> >>>
> >>> Bryan KL7CN/W6
> >>>
> >>> On Jun 18, 2016, at 12:28, John Brier <johnbrier at gmail.com> wrote:
> >>>
> >>> I just setup MacDoppler last night and got it to do basically what I
> >>> wanted but I can't figure out if it's possible to simulate past/future
> >>> passes beyond the 6 hour +/- changes you can make with the slider. I
> >>> can get beyond that limit if I change the system date/time but I'd
> >>> prefer not to have to do that to get what I want.
> >>>
> >>> I did see you can get predictions for anytime but what I'm interested
> >>> in is not just that, but watching the map from the past passes.
> >>>
> >>> Is there a way to do that?
> >>>
> >>> 73,
> >>>
> >>> John Brier KG4AKV
> >>> _______________________________________________
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> > _______________________________________________
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> _______________________________________________
> Sent via AMSAT-BB at 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
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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