Author Topic: CGX sound at idle  (Read 688 times)

Steven Tolbert

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CGX sound at idle
« on: January 08, 2018, 12:29:47 AM »
I just got the new Celestron CGX mount. Its been really cloudy lately(of course) to actually try it, other than assembly and powering it on. Making sure it seems functional out of the box.
My question is: with tracking mode off, is this sound normal when idle ? see attached wav file.

The noise does not start until after it has found home position and continues until powered down. Tracking mode is off.

anyone else hear this? am I to assume it is just maintaining home position? I don't believe it makes that sound if I skip the find home position and try slewing then stop and listen.

I opened a support ticket with Celestron just to ask if this is normal.

Jeff



chibamaham

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Re: CGX sound at idle
« Reply #1 on: January 08, 2018, 01:05:07 PM »
Thanks for the info PWP. I forgot to mention I have nothing on the mount, no OTA or even a counter weight. not sure if it makes a difference.
I will have a look at the resetting.

Chad Fithian

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Re: CGX sound at idle
« Reply #2 on: January 08, 2018, 04:37:41 PM »
Yep, that's the sound mine makes while tracking or idle. More or less. More like the sound at the end of the file. It gets louder as the night goes on. I did mention this to Celestron in a support ticket but heave not heard back from them.

tinlengmmuner

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Re: CGX sound at idle
« Reply #3 on: January 10, 2018, 07:56:17 PM »
Thanks moonrider. does your function ok? tracking and goto wise?

I have an AVX and it seems to do almost the same sound. quiet when turned on, then as soon as you move the ra or dec motors it does it.

I sent Celestron tech support an audio file from the CGX. They want me to do a video showing the mount moving and what is displayed on the hand controller and go from there.

isanruptysp

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Re: CGX sound at idle
« Reply #4 on: January 12, 2018, 05:21:30 AM »
mine is still within 30 days of receipt from Skies Unlimited. If it does turn out to be a problem, should I send it in to Celestron or exchange it with Skies unlimited?

What does anyone think.?

Zachary Patterson

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Re: CGX sound at idle
« Reply #5 on: January 12, 2018, 05:44:11 AM »
Mine is tracking fine after doing a reset. I believe my noise is not as loud as yours, but it is quite different from my CG5asgt which was very quiet when idle or tracking, After I did the reset, it did quiet down some though.

leypelepha

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Re: CGX sound at idle
« Reply #6 on: January 12, 2018, 07:59:06 AM »
I bought the CGX mount last month and was wondering about this as well. Even with TRACKING OFF it sounds like an old computer hard drive. I bought mine from High Point Scientific, so I sent them a video of the sound. They seemed to think this was normal, but sent it on to Celestron as well to make sure. The mount seems to work perfectly fine, just makes a lot of noise if your surroundings are dead quiet!

Joseph Garrison

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Re: CGX sound at idle
« Reply #7 on: January 13, 2018, 08:06:19 AM »
Thanks for the info A380 Driver, (cool job by the way)

Yep, Great description of the noise as well. Good to hear others seem to have the same inherent noise and all is well. Maybe I am just paranoid, as long as it tracks well maybe it is just normal for this mount.

I have an AVX as well and noticed it making similar sounds when idle and not tracking, just not so pronounced. But it is a smaller mount. I uploaded my video of the mount to vimeo.com for Celestron tech support. Still waiting to hear what they say.

https://vimeo.com/209901333

ciomapicsta

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Re: CGX sound at idle
« Reply #8 on: January 13, 2018, 11:52:33 AM »
Jeff, my new CGX-L mount makes a similar sound in the Home position. Less so when slewed away.

dan
Seaside, Oregon

nontpremlapi

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Re: CGX sound at idle
« Reply #9 on: January 14, 2018, 05:23:49 AM »
I heard back from Celestron support.

They said "Hello Jeff,
Thank you I have been told that updating the firmware will correct the issue.Please try updating the firmware."
The firmware version they sent me was 2.3.7070

I tried it but it still makes that noise which is coming from the motor under the saddle plate.

Not sure what to think. Have had really bad weather to even try it out tracking, maybe this weekend.

Chris Jiles

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Re: CGX sound at idle
« Reply #10 on: January 18, 2018, 07:49:31 AM »
Thanks Dan, I guess I am just paranoid after spending a chunk of money on this. I need to check the axis position and see what it is doing when making that motor noise. Otherwise I guess all is well.

Clear skies, eventually

Jeff

Calvin Dolla

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Re: CGX sound at idle
« Reply #11 on: January 21, 2018, 07:53:24 AM »
Hey guys, I just set up my new cgx and powered up for first time and noticed the motor noise - very similar as yours. On mine it just sounds like the DEC motor more than the RA motor - sounds like little motor ticks but I think and just wondering if this is normal yet the noise is just attenuated by the plastic housing. Has anyone confirmed with Celestron if this is normal? I don't feel any vibration but I'm a little worried that this could be significant if we are worried about vibrations from the likes of mirrors and stuff, this seems weird to me. You would think that they planned on the min resolution ticks would be way below thresholds. Oh well, I just spent about 10 minutes on this so I'm going to check back - seems this site is the best place to see what is going on for us CGX owners. thanks Marty

Kyle Johnson

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Re: CGX sound at idle
« Reply #12 on: January 23, 2018, 08:14:53 AM »
Hi Marty,

As I mentioned in my earlier post. Celestron support said a firmware update would take care of it.The firmware version they sent me was 2.3.7070 which I had already done using the CFM utility. It did not eliminate it, may have helped some but doing a factory reset also helped.
Kind of mixed reviews on this whether it is an issue. A couple of vendors are saying they at least think it is normal and inherent to the mount. One suggested monitoring the axis positions on the hand controller and see if they drift. I did this for an hour and the coordinates(without tracking on ) stayed dead on.
When I power up it is dead quiet, until I slew or find home(set switches).
I have an AVX mount and I admit it makes a similar noise. Also know of a buddy with a CGE and pretty sure I heard the same sound.

Would be nice to hear from someone higher up at Celestron for a definitive answer?

Jeff

sainomaters

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Re: CGX sound at idle
« Reply #13 on: January 23, 2018, 05:33:31 PM »
CGX owners:

I wish I could be of more help vis-a-vis the noise issue. After further assessment, my CGX-L does indeed continue to emit the slight buzz modulated at ~1hz. It occurs after slewing, and changes somewhat when slewed back to the HOME position. The buzz continues with tracking off. In the HOME position, a noise is clearly heard (and amplified) thru the vents of my 1100 Edge HD and sounds like the whirl of a fan. It is the RA motor driving the belt. You can watch the cog move in tracking mode. In evaluating the NexStar data bus with an oscilloscope, there is a continuous ~1hz update that matches the noise interval. I did not see the data changing so perhaps it is just a watchdog/status poll. It is difficult to state anything definitive as it is all just a mysterious black-box with no technical details available. I would be tempted to pop the cover and look at the DEC circuit board ... but alas, other things to do. I wish Celestron would provide details on the circuit design or simply confirm the nature of the noise. It appears to be totally benign however and doesn't concern me in the least. I am using the latest firmware.

I am scheduling time to garner tracking metrics via PHD2. Just waiting for the rain and clouds to facilitate my requirements!

dan
Seaside, Oregon

David Felkel

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Re: CGX sound at idle
« Reply #14 on: January 23, 2018, 05:54:24 PM »
hi Jeff, quick update. I was talking to Dan an another thread on this what seems like an anti-backlash dec motor issue and pretty benign at this point. I tried a reset and looked for your version but I am confused with your version number. What exactly are you upgrading? I have a list of firmware revisions form here (link below) and I am on what should be the latest revision for MC of 7.13.6223.  I also submitted a ticket. I was hoping to hear from them by now. So I'm not too worried just more disappointed with the lack of clear feedback from them and a little bit annoyed too by the fact that the belt is not centered on the wheels and there does not seem to be an adjustment screw. Does it work, YES. I see this as something that will need a hardware revision. I'm just hoping it tracks way better than the DX. I didn't want to shell out more $$ for Large. I can live with the buzzing DEC motor. Maybe they rushed this a tad to market. I have not completely set up yet. I will try and report back.

http://software.cele...ion_History.pdf