#EXOS2 PMC Control Box makes rattling noises - Crazy? #EXOS2


Hello I´m Ersin from Germany and i bought a pre-owned comet hunter and the exos2 pmc mount. After getting the system run (probs with android and missing sqllite/data) i´m pretty happy but the rattling noise coming out of the controller makes me a little bit nervous. It sounds like a relay which is switching high frequently - any suggestions, firmware update?

Thank you for kind help and best regards from Germany

Jerry Hubbell - Explore Scientific VP Engineering

On Mon, Jun 29, 2020 at 08:06 AM, Ersin wrote:
It sounds like a relay which is switching high frequently - any suggestions, firmware update?
Hi Ersin,

I am sorry you are having this issue. The controller should not be making any noise at all as you noted.
Please contact Explore Scientific Germany at

They should be able to help you with checking out the PMC-Eight.  Do you know how old it is? Do you know if the previous owner 
registered the system with us? Did they tell you about any problems with the mount prior to you buying it?

Thanks, I am sure you will be taken care of.
Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at
1010 S. 48th Street
Springdale, AR 72762

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home

Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!


Thank you for kind and prompt reply Jerry.

According to the previous owner the "set" is from 2019 an he did not mentioned any issues with the mount. Maybe your colleagues in Germany are able to identify the mount with the serial number.

Again thank you for your help.

Best regards
Ersin Gueler