Weasner's Meade ETX-90 User Feedback

ETX-90 USER FEEDBACK

Last updated: 18 January 2005

This page is for user comments and information specific to the Meade ETX-90RA (originally known as the "ETX Astro"), the ETX-90EC, and the ETX-90AT. Comments on accessories and feedback items appropriate to other ETX and DS models are posted on other pages. If you have any comments, suggestions, questions or answers to questions posed here, e-mail them to me and I'll post them. Please use an appropriate Subject Line on your message. Thanks.

Subject:	EXT 90 RA
Sent:	Tuesday, January 18, 2005 08:52:42
From:	Ray Chamberlain (rchamber@sspencer.k12.in.us)
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 Chamberlain

Mike 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 (wilstay@juno.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,FL

Mike 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 (rossvalentin@yahoo.com)
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,
Ross

And from our resident hardware expert:

From:	P. Clay Sherrod (drclay@tcworks.net)
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.bilton@ntlworld.com)
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, UK

Mike here: 1.5A is best. Otherwise you will get slewing and tracking errors.

And:

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 (raehot@hotmail.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!

- Robert

Mike 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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