Last updated: 18 January 2005
Subject: EXT 90 RA Sent: Tuesday, January 18, 2005 08:52:42 From: Ray Chamberlain (firstname.lastname@example.org) I HAVE AN EXT 90 RA. IS IT POSSIBLE TO UP GRADE SO THAT I CAN AUTOSTAR HANDHELD, OR WILL I HAVE TO PURCHASE AND EXT 90 AT? Ray ChamberlainMike here: See the FAQ page on my ETX Site.
Subject: Converting ETX 90 to Autoatar using DS mount Sent: Monday, January 17, 2005 14:33:23 From: Thomas C Wilson-Stayton (email@example.com) I remember an article on your site in which the author described converting an older ETX 90 (non-Go-To) using a DS 90 (or similar) scope tripod and mount. I picked up a damaged DS-90 at Sam's Club (eyepiece holder destroyed, eyepieces missing, but mount, AutoStar and tripod in good shape) for $50 and am hoping to convert my older ETX-90 to Go-To. I couldn't find the article and was hoping you could help. Thanks. Claude Wilson-Stayton Brandon,FLMike here: I think the article you want is "ETX-90RA on DS Mount" on the Helpful Information: Telescope Tech Tips page.
Subject: ETX RA motor Sent: Tuesday, January 11, 2005 21:15:52 From: ROSS VALENTIN (firstname.lastname@example.org) Please help. I have a ETX 90 RA scope I'm trying to modify my RA drive. Do you know what kind of motor the Meade ETX 90 RA scope has? Among the type of motor listed below 1. plain DC motor 2. DC servo motor 3. AC motor 4. stepper motor. what could it be? What voltage is the motor running on? Is the motor of the ETX 90 RA the same as the ETX 90 EC? Thanks, RossAnd from our resident hardware expert:
From: P. Clay Sherrod (email@example.com) The motor is a small Hurst (or similar) 3 to 4.5 volt synchronous DC unit. Except for the control panel which really is nothing more than a North-South and switch plate, the voltage of a replacement would not matter if you had the power support to use it; the cycles are 60 for proper operation. Clay -------------------- Dr. P. Clay Sherrod Arkansas Sky Observatories Harvard MPC H41 (Petit Jean Mountain) Harvard MPC H43 (Conway) Harvard MPC H44 (Cascade Mountain) http://www.arksky.org/
Subject: ETX-90EC Milli Ampige Sent: Thursday, January 6, 2005 13:53:01 From: Lawrence Bilton (Lawrence.firstname.lastname@example.org) I have came across an AC to DC adapter with an out put of 12V but i wanted to know what the Milli ampige of the ETX-90EC is the one on the adpter i found is 300mA id that too less, somebody suggested 1200mA. Help would be appreciated Best regards, Lawrence Lincoln, UKMike here: 1.5A is best. Otherwise you will get slewing and tracking errors.
Tnak you for the quick reply, love the site so much info, Thank you, Lawrence
Subject: ETX-90 specs Sent: Monday, January 3, 2005 18:03:15 From: Robert Edmondson (email@example.com) I made a solar filter cell for my ETX-70 with Baader film (cardboard and a peanut can) and I would like to use the other half of my film sheet to make a filter cell for my friend's ETX-90 as a surprise gift. He has never really used the telescope and I think that the sun might be a good place to start for him - easy to find, changes frequently, etc. I was wondering if you knew the outside diameter of the ETX-90? Thanks for the site! - RobertMike here: I measured the inner diameter of my Thousand Oaks Solar Filter (which slips on over the aperture); it is 4.2".
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