Hi Folks,
I have recently been following AO-91 with a selection of tracking programs and confirming the results with observations of the downlink.
Using the same QTH location and Keps, I found the following: The AMSAT-NA online tracking page is pretty accurate. See: https://www.amsat.org/track/index.php Heavens-above.com is also pretty good. See: https://www.heavens-above.com SatPC32, Orbitron, InstantTrack, and Quiktrak are pretty good and give the same results as the “On-Line” trackers.
Nova is about 5 minutes ahead. GPredict is about 5 minutes behind.
Has anyone else noticed this?
73, Terry Osborne ZL2BAC
On 9/2/18, Wendy and Terry Osborne wandtosborne@gmail.com wrote:
Hi Folks,
I have recently been following AO-91 with a selection of tracking programs and confirming the results with observations of the downlink.
Using the same QTH location and Keps, I found the following: The AMSAT-NA online tracking page is pretty accurate. See: https://www.amsat.org/track/index.php Heavens-above.com is also pretty good. See: https://www.heavens-above.com SatPC32, Orbitron, InstantTrack, and Quiktrak are pretty good and give the same results as the “On-Line” trackers.
Nova is about 5 minutes ahead. GPredict is about 5 minutes behind.
Has anyone else noticed this?
<snip>
I've never worked AO-91, so I can't comment on that. I run Gpredict on a Linux ThinkPad and i found that it's been accurate for satellites such as FO-29.
73s
Bernhard VA6BMJ
Make sure the keps are updated, Aldo the clock but I assume they are running on the same computer so that is unlikely to be a problem.
73, Don KB2YSI
On Sun, Sep 2, 2018, 02:10 B J va6bmj@gmail.com wrote:
On 9/2/18, Wendy and Terry Osborne wandtosborne@gmail.com wrote:
Hi Folks,
I have recently been following AO-91 with a selection of tracking
programs
and confirming the results with observations of the downlink.
Using the same QTH location and Keps, I found the following: The AMSAT-NA online tracking page is pretty accurate. See: https://www.amsat.org/track/index.php Heavens-above.com is also pretty good. See:
SatPC32, Orbitron, InstantTrack, and Quiktrak are pretty good and give
the
same results as the “On-Line” trackers.
Nova is about 5 minutes ahead. GPredict is about 5 minutes behind.
Has anyone else noticed this?
<snip>
I've never worked AO-91, so I can't comment on that. I run Gpredict on a Linux ThinkPad and i found that it's been accurate for satellites such as FO-29.
73s
Bernhard VA6BMJ _______________________________________________ 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
Nova has two algorithms for computing the location of the satellites. Try the other algorithm.
73, Steve N9IP -- Steve Belter, seb@wintek.com
On Sep 2, 2018, at 8:28 AM, Don KB2YSI kb2ysi@gmail.com wrote:
Make sure the keps are updated, Aldo the clock but I assume they are running on the same computer so that is unlikely to be a problem.
73, Don KB2YSI
On Sun, Sep 2, 2018, 02:10 B J va6bmj@gmail.com wrote:
On 9/2/18, Wendy and Terry Osborne wandtosborne@gmail.com wrote: Hi Folks,
I have recently been following AO-91 with a selection of tracking
programs
and confirming the results with observations of the downlink.
Using the same QTH location and Keps, I found the following: The AMSAT-NA online tracking page is pretty accurate. See: https://www.amsat.org/track/index.php Heavens-above.com is also pretty good. See:
SatPC32, Orbitron, InstantTrack, and Quiktrak are pretty good and give
the
same results as the “On-Line” trackers.
Nova is about 5 minutes ahead. GPredict is about 5 minutes behind.
Has anyone else noticed this?
<snip>
I've never worked AO-91, so I can't comment on that. I run Gpredict on a Linux ThinkPad and i found that it's been accurate for satellites such as FO-29.
73s
Bernhard VA6BMJ _______________________________________________ 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
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
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@amsat.org
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@amsat.org
_______________________________________________ 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
participants (5)
-
B J -
Don KB2YSI -
JoAnne K9JKM -
Stephen E. Belter -
Wendy and Terry Osborne