[amsat-bb] Observations on tracking programs

[Wendy and Terry Osborne]

Hi Folks,

Following JoAnne's advice, I found 3 entries for AO-91 in GPredict for 
Windows.
One was 5 minutes fast, one was 5 minutes slow and the 3rd one was correct.
The correct one is the 3rd one down on the menu.
If anyone else is having problems, then that is the one to check.

73,
Terry Osborne ZL2BAC

-----Original Message----- 
From: Wendy and Terry Osborne
Sent: Monday, September 03, 2018 2:58 PM
To: JoAnne K9JKM
Cc: amsat-bb at amsat.org
Subject: Re: [amsat-bb] Observations on tracking programs

Hi JoAnne and everyone,

Thanks for that.
Yes I had two entries for AO-91. One with last years keps that I had
selected and one with current keps that I hadn't selected.
Putting the correct entry in fixed the problem and Nova now agrees with
Orbitron.

I usually go outside and catch AO-91 with a hand held  + yagi.
When using Nova, I had to wait about an extra 5 minutes for AOS and LOS was
about 5 minutes later than predicted.
I actually like Nova, just a personal preference really.

73,
Terry Osborne ZL2BAC


-----Original Message----- 
From: JoAnne K9JKM
Sent: Monday, September 03, 2018 1:02 AM
To: 'AMSAT BB'
Subject: Re: [amsat-bb] Observations on tracking programs

> Nova has two algorithms for computing the location of the satellites.  Try
> the other algorithm.

I've noticed a bit of sneakiness tracking AO-91 with Nova. I find I'm
several minutes off once or twice a year. The main symptom is a weak
downlink from AO-91 since the antenna is aimed at a spot in the sky which is
not on time.

What I've found is somehow Nova has 2 or 3 instances of AO-91 in the table
where you choose the satellites to add to the tracking view. None of the
other satellites have multiple instances. What I need to do is to select
each instance of AO-91 and keep only the one that accurately matches the
other resources you can compare with.

--
73 de JoAnne K9JKM
k9jkm at amsat.org



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