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After updating my legacy HC to the 99.22 (I had to, because of the GPS rollover issue) and the MC to the 5.23 firmwares (siply because it was there, and I've got greedy), both acquired via Teamcelestron, my CPC was operating normally until, all of the sudden, its altitude motor stopped working. I've uploaded a video at youtube showing what happens:
As you can see, I don't get any error message in my HC but, if I try to move the scope in altitude, nothing happens (no movement, no motor noises, nothing). When I release the clutch and move the scope manually in altitude, it does move but has a weird noise by the same place where previously it used to make a snap one, which I already reported to celestron tech support once, and even made a video that I also uploaded to youtube:
I've already seeked help from Celestron Tech support (and the folks at Cloudy Nights) but any help from you would be very much appreciated. Best regards,
By Cosmic Geoff
On 25th March I tried some live stacking with Sharpcap and a 102mm f5 Startravel achromat & ASI120MC camera.
Mount was Celestron SLT on custom tripod. Image size: 1280x960.
With this setup it is possible to dial in an object to the GoTo and be confident that it will appear on the laptop screen.
These images may not look too exciting but they do mimic the FOV and general appearance as seen in a 203mm SCT with 25mm EP. Check the image for M87. When I checked the field in Stellarium I found that two faint non-star smudges matched with NGC4478 and NGC4476, which are 11th and 12th mag galaxies. I am gob-smacked that I managed to image these with such modest equipment from an urban site. There is no way I would be able to see these visually even with a C8 from here.
By Cosmic Geoff
I have discovered that the Nexstar+ handset of my CPC800 has a Camera sub-menu, apparently for controlling a camera. This is not documented in the CPC800 manuals and I could not find any instructions online. All I found on the Celestron website was a picture of a C8 SE with a camera attached and a cable leading from the camera to the aux port.
Has anyone used this feature, or have some instructions? Is it really useful for anything?
I wasn't sure where to post this tip....it is probably of most use here....
Many of us with observatories or indoor Mission Control use Windows 10 Pro Remote Desktop to control a scope side computer running camera and scope control software from a second computer indoors. This works superbly at 1080p resolution.
However, I have struggled for a year trying to perfect a wireless solution that works with 4K UHD cameras terminating in a 4K UHD display. Until now, whilst cat 6 cable does work fine, wireless even at 5Ghz 802.11ac has struggled with some lag and poor performance. I have spent a fortune upgrading wireless adapters and range extenders, but this isn't the issue!
Here is a solution;
1. Seperate your dual band network into distinct 5Ghz and 2.4 Ghz channels.
This is easy with (say) a BT Home Hub. If you don't do this, it can be a bit hit or miss whether your 5 Ghz wireless adapters connect to the right channel. You will now see TWO channels, one at 2.4 Ghz with a suffix like <hub name> and another at 5 Ghz named <hub name -5>. Connect your 5Ghz adapters to the latter. If your internal adapters are merely 2.4Ghz, you can disable them via Device Manager and plug in a USB version costing around £5. Note that at 5 Ghz wireless range might drop. If so, a Netgear EX8000 wireless extender is recommended as it employs 'mesh' technology.
2. ONLY if you have a fast network, and powerful CPUs and quality graphics card, try DISABLE 'RemoteFX compression' in RDP.
This allows uncompressed screen data to flow across RDP. I have found this improves performance whether using 802.11ac wireless or cat 6 cable. What RemoteFX compression appears to do is limit effective RDP speeds to under 10Mbps (due to translation times). That is crazy if you have 433 Mbps adapters, and an 802.11ac network (or catv6 cable). Unleash the beast! Send across uncompressed data! The issue is not with speed or bandwidth, it is an artificially imposed limit in RDP.
To do this type 'Edit Group Policy' in the Windows 10 Pro search box (doesn't work in Win 10 Home). You need to drill down through about five levels of Windows Configeration Folders, and Administration Templates and Remote Desktop Services/Host folders to find a utility named <Edit RemoteFX Compression>. In that, your options are <disable> compression or <enable> a compromise mode.
If you don't know how to do this try Googling 'Disabling RemoteFX Compression' to find a lengthy Microsoft tutorial. Or visit https://docs.microsoft.com/en-us/windows-server/administration/performance-tuning/role/remote-desktop/session-hosts .
I deliberately don't here state the quick route sequence to access this deeply embedded network utility command because you are delving deep into developer/administrator territory and do need to understand what you are doing and how to revert to your original RDP settings if your network can't handle these levels of uncompressed screen data. We don't want any novice attempting this on a cheap Compute Stick on an inadequate network!
3. When employing RDP from your computer indoors, select <WAN 10 Mbps> or <LAN 10 Mbps> as appropriate via <Options><Experience>. The default <auto-select my connectivity> often selects too low an option. The irony here is you can select this and still not enjoy faster speeds unless you have edited/disabled RemoteFX compression.
I now have Atik Infinity plus CPWI software running in an end to end 4K UHD system terminating in a 4K UHD monitor. Over 802.11ac wireless it is now rock steady. Over cat 6 cable my system is now turbo powered. If you don't need RemoteFX Compression, don't let it restrict your network performance. It is evidently set to ensure it works on lowest common denominator networks. If you have a fast network/CPU, disable RemoteFX compression and finally release the beast of 4k UHD over RDP.
After a fistful of stars from the other night here's a few stars more from last night . Transparency was poor, though and I had to give up in the end. As well as fitting the Lightwave 0.8x to my 80 mm F6, I've also transferred the scope to the Heq5. Although I think Sharpcap is great for live stacking it won't always detect enough stars to auto align which means I have to use guiding. I can see plenty of stars on the screen but Sharpcap refuses to share my view! I've tried noise reduction and boosted digital gain etc. I think I'll try the v3.2 beta. I might try without the uhc in future as it probably cuts out too much light when combined with the IDAS D1. All live stacked with darks and flats. Some were guided.
M35 - 20 x 30s with IDAS D1 and UHC:
NGC 2420 aka the Twinkling Comet Cluster, 30x30s:
Jellyfish Neb, 40x30s:
You can just see the edge of it with some stretching!
More apparent with overstretch but - yuk!