GPS stability
Posted: Sat Dec 23, 2023 2:50 pm
Hello Robin and other QHY174GPS user,
I'm processing the different films of my expedition to the occultation of Betelgeuse.
I used 2 GPS cameras and 3 other non-GPS. I'm now looking in detail the time stability between the computer system time and the GPS time.
I have some surprises.
One camera/computer time was very stable, except for 2 events.
Here the region with the special time ... where the end of the frame is before the start of the frame.
Does somebody already remark the same ?
What could be the reason ?
Here the complete curve from the beginning to the end of the capture.
And for the other camera: without extreme event with 1 s difference, but with several "flat" sequences.
My setups were the following:
On the first EQ8 mount, 2 telescopes (RASA8 and Newton 254/1000) and 3 cameras (QHY268 on the RASA, QHY174GPS and QHY178 on the Newton with a beam-splitter cube). On the second EQ8 mount, 2 telescopes (GSO RC6 with QHY174GPS and GSO RC8 with Allied Vision Goldeye SWIR camera).
For the synchronisation of all the cameras, I prepared a photo flash ... it was in my hands switch-on ready to use.
But I looked up and saw a cloud band cross Orion ... so I was concentrated on the cloud and I completely forgot to use the flash for the synchronisation. So it means that I have more work now to synchronise the other 3 cameras with the GPS time.
Best regards and nice Christmas,
Jean-Francois
I'm processing the different films of my expedition to the occultation of Betelgeuse.
I used 2 GPS cameras and 3 other non-GPS. I'm now looking in detail the time stability between the computer system time and the GPS time.
I have some surprises.
One camera/computer time was very stable, except for 2 events.
Here the region with the special time ... where the end of the frame is before the start of the frame.
Does somebody already remark the same ?
What could be the reason ?
Here the complete curve from the beginning to the end of the capture.
And for the other camera: without extreme event with 1 s difference, but with several "flat" sequences.
My setups were the following:
On the first EQ8 mount, 2 telescopes (RASA8 and Newton 254/1000) and 3 cameras (QHY268 on the RASA, QHY174GPS and QHY178 on the Newton with a beam-splitter cube). On the second EQ8 mount, 2 telescopes (GSO RC6 with QHY174GPS and GSO RC8 with Allied Vision Goldeye SWIR camera).
For the synchronisation of all the cameras, I prepared a photo flash ... it was in my hands switch-on ready to use.
But I looked up and saw a cloud band cross Orion ... so I was concentrated on the cloud and I completely forgot to use the flash for the synchronisation. So it means that I have more work now to synchronise the other 3 cameras with the GPS time.
Best regards and nice Christmas,
Jean-Francois