Last updated: 30 September 2004
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.

Weasner Experiences the ETX-90EC! (7/31/99)
Sky & Telescope ETX-90EC review (4/30/99)
ETX-90EC, NexStar5 comparison (2/24/01)
ETX-90EC Press Release (1/28/99)
ETX-90EC Accessories (1/28/99)
DSX-90 Photos (12/03/03)

Subject:	faulty declination lock
Sent:	Sunday, September 26, 2004 19:09:50
From:	Daniel LaRoche (
Recently I purchased an ETX90EC Meade telescope secondhand from a friend
who said he "barely ever used it." It looked in pristine condition until
I looked at the telescope in more detail. The Declination lock, which I
was told was supposed to engage the vertical motors, would not engage.
The motors would whirr, but nothing happened and I could easily move the
scope manually. When I turned the lock all the way to the left (unlock),
the scope felt a little wobbly in the fork. When I turned  it to the
right until it abruptly stopped, it still felt wobbly, and the scope was
still able to move up and down manually. The motors again did not catch
when I used the controller. I've checked all the help sites for a
similar problem, but I could not find anything. Please help me.
-Dan LaRoche
Thetford, VT
Mike here: The Right Tube Adapter has failed. You can try a repair yourself (see the Telescope Tech Tips page or purchase a replacement from Meade or from Astro Hut (see the Astronomy Links page).
Subject:	ETX-90 on GEM?
Sent:	Sunday, September 26, 2004 15:43:45
From: (
Hello.  I would like to put my old ETX-90 RA on an GEM.  Is the tube
strong enough to use tube rings, or should I just use the 1/4" holes at
the base of the tube?
Thanks, Mark Kramer.
Mike here: Either will work fine. Some people use the ETX-90 as a guidescope and they mount it using rings.
Subject:	ETX RA 90 tube on a ETX70EC fork???
Sent:	Wednesday, September 15, 2004 11:20:28
From:	John McVey (
Have you heard of anybody successfully upgrading their ETX 90 RA to an
EC by buying an ETX70EC and using it's fork mount with the RA tube
Thanks for any guidance you can give,
Mike here: See the article "Putting ETX-90 on ETX-70 forks" on the Helpful Information: Telescope Tech Tips page.


Thanks!  I'll check it out.


Subject:	ETX 90 Versions
Sent:	Sunday, September 5, 2004 23:46:16
From:	mdimassa (
I am in the process of buying a used ETX 90 RA. From what I can gather,
this was the original version of the ETX 90. I was wondering if you
could direct me to some information on how the RA differs from the AT
and EC models, and what upgrades (if any) can be done to my scope to
bring it up to the standards of the later models.

Live Long & Prosper,

Michael  Di Massa

Publishing Support Assistant II
Digital Graphics ADvantage

"Reputation is what other people know about you.
Honor is what you know about yourself."
Lois  Mc Master  Bujold,
A Civil Campaign
Mike here: The telescope itself is the same. The EC model added a handcontroller and the AT model added the Autostar and a tripod. While there are some add-ons that can make the RA model more "electronic" (see the Accessory Reviews - Miscellaneous page), many of these add-ons may not be available any more. You could also mount the telescope on a different mount; see the Helpful Information: Telescope Tech Tips page for tips on that.


Interesting. Is it possible to simply plug the hand controller and the
Autostar into my ETX-90 RA, or is it more complicated than that?
Mike here: There is no electrical connection for the Meade EC handcontroller on the RA model. No upgrade is possible.


I have done a bit of Web surfing since I wrote; would a Meade 1244 or a
JMI Motofocus perform the same or similar function as the EC

Do you have any preference regarding these two devices?

Is there any major difficulty in connecting an AUTOSTAR #497 controller
to an ETX-90 RA?
Mike here: The Autostar can not be connected to the ETX-90RA. The EC handcontroller provides slewing, NOT focusing. But you can read about those focusers on the Accessory Reviews: Miscellaneous page.
Subject:	ETX90AT with autostar?
Sent:	Wednesday, September 1, 2004 16:00:09
From:	barry miller (
hi my name is dean and i was thinking about buying my first
telescope..however im not all that smart when it comes to them ...i know
in most cases you get what you pay for and i have been looking at the
meade etx 90mmx1250mm a.t  with autostar   is this a good choice? i have
a twelve year old and he is really interested  so i want to buy one that
when he looks through it he is amazed not dissapointed ...guess i want
to look at the moon or saturn and see something other then a blurry
white dot.. will this scope do this?  i appreciate your time and hope to
hear back from you
                                                                            thanx, dean
Mike here: As you can tell from many of the comments and info on my ETX Site, the ETX-90 is a fine telescope. You might want to read through some of the reports on the feedback pages, the Buyer/New User Tips page, and the User Observations pages.
Subject:	Re: ETX-90 motor specs?
Sent:	Tuesday, August 31, 2004 22:26:58
From: (
what is the operating RPM of the RA motor, and if possible the gear-box
ratio, i have now the model in Pspice of Power Electronics, maybe would
work to get a forward and backward AD using the TL494 PWM Controller
from texas instruments.

 Thanks, nice outcomings.

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