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

[Bryan KL7CN]

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 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