ETX-90EC USER FEEDBACK
This page is for user comments and information specific to the Meade ETX-90EC. Comments on accessories and feedback items appropriate to other ETX 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: Help Sent: Thursday, September 28, 2000 09:13:39 From: email@example.com (Brian) Mike I think your site is just fantastic. I am new to the hobby of astronomy and love it. I am however frustrated right now with my ETX. I must tell you that I am the type of person that must have all the bells and whistles when I get into something. I know that this is not necessary in Astronomy and that a working knowledge is better than all the electronics for the most part. Here is my plight and I woas wondering if you could help me or post it on your site to have others see where I am making my mistakes (sorry this is so lengthy) I have the ETX 90 with autostar (I have updated to the 2.0 version) Meade tripod 26mm lens barlow and 9.7 mm lens Here is my problem....I take the scope and tripod out side do the alignment process to prevent the scope from hitting the hard stops (you know spin it counter clockwise till it stops then back clockwise till the arm is over the control panel) and point it due north (I cannot see Polaris due to a tree a large one) but I have looked at maps, used a compass and a GPS unit to verify that I am looking north (I can see the stars of the big dipper that point to Polaris so I know I am close). I tilt the tripod head to 41 degrees (I live in Toledo Ohio) level the tripod and start autostar. I then select say a star, hit enter, then go to.....the scope starts to slew (counterclockwise) trying to get around to the star and hits the hard stop before it gets there. thats it....any ideas......Mike here: Well, a question first: is the control panel on the east or west side of the tripod? Some users have reported success using it on the east side but I think it is supposed to be on the west side.
it is on the west side. When I turn it clockwise from the Hard stop I am turning it maybe 180 degrees....maybe a little more maybe a little less..I am following the instructions that came with the tripod but sometimes it acts weird......batteries are new....i just am lost....Mike here again: If you follow the steps "Autostar Altitude/Azimuth HOME Position" on the Autostar Information page, what happens?
same thing...the scope tries to slew the wrong direction...if it went clockwise it would have to turn 360 degrees to get there but at least it could do it instead of hitting the hard stop...
Subject: ETX-90EC Questions Sent: Wednesday, September 27, 2000 15:06:45 From: firstname.lastname@example.org (Ed Mitiu) Hi! I've been researching the Meade ETX-90EC. It looks like a lot it's a lot easier and more interesting to use than a regular telescope! . . . had one of those already, but it was too difficult to find things in the night sky and too touchy to focus and keep that way. What kind of tips or advice can you offer me on buying a used model? Are there any updates or improvements to the ETX-90EC that I should know about? I know of a guy who is offering his used ETX-90EC with the following things included: # 497 Autostar Computer Controller # 825 8x25mm Right-Angle Viewfinder # 880 Table Tripod # 1244 Electric Focuser 26mm Super Plossl Multicoated Lens The # 1244 Electric Focuser . . . does the ETX-90EC come standard with this. If not, is it necessary . . . or recommended . . . to have the electric focuser? Is the # 497 Autostar Computer Controller included with this model or do I need to purchase it separately? And how about the tripod? . . . I've heard that it make using the unit quite a bit easier . . . is that right? This guy says he's only had it out of the box once and never did any actual viewing with it. Any ideas on what a fair price for this would be? I understand these are a lot of questions, but I would sincerely appreciate any information or insight you could give me. Thanks . . . EdMike here: The ETX-90EC does make a fine telescope. Only the finderscope and eyepiece you mentioned are included in the standard $595 system. However, the rightangle version of the finderscope is not standard. The table top tripod legs, Autostar, and electric focuser are optional. With the Autostar, you may not need the legs since you can use the ETX in Alt/Az mode. However, you will find the focuser VERY useful to avoid hand-induced vibrations during focusing. As to a price, this system would sell for approximately $900 (US) new. You might want to check eBay for going prices. Also, check Shutan's site for used ETX models; they may have some if you really want to go the used route. I haven't priced any used systems.
Subject: Using AC supplies with the ETX Sent: Sunday, September 17, 2000 12:59:19 From: email@example.com (Paul J. Boudreaux) I saw the email from Anonymous on Sep 15, 2000, USER COMMENTS ETX90 about how he/she had connected an battery powered electric drill charger supply to the ETX. Most of these recharger power supplies are not true DC level supplies. They often are merely half wave pulse rectifiers designed to pulse charge NiCd batteries. You need a full DC level (no pulses) to operate the ETX with an external power supply. When people want to use an AC power supply with the ETX, be sure you have a true DC output and not a pulsed DC level. Perhaps that is what happened to Anonymous? Paul Boudreaux
Subject: Re: Anonymous and the fried ETX***ETX90 E/C Section*** Sent: Sunday, September 17, 2000 12:08:02 From: firstname.lastname@example.org (Damian Davis) I've just read the posting from Anonymous (15 Sept), regarding the use of an X-acto drill power supply, and the subsequent demise of his ETX. This is sheer supposition, based on 25 years experience as an engineer with a world famous Broadcasting Corporation based in Britain, but I suspect that the nominal 12V from the X-acto PSU is nearer to 18V when it is off load, dropping to 12V when driving the drill. The ETX will take much less current than the drill (when the motors are not running), so the voltage experienced by it will be about 15-18 volts, which is probably enough to send it into the next world. These small 'battery eliminator' type of power supplies are not regulated, and rely on the load and their own internal resistance to give the stated voltage, similar to your 12V car battery dropping to 8V while turning the starter motor. Others be warned!! Use the Meade device, or a *regulated* PSU (9 volts seems to avoid motor runaway, and is perfectly adequate), or take the plunge and buy 8 NiMH rechargeables and the appropriate charger. (they last longer than NiCads, and have less of a 'memory' effect) If you want to use a PSU that you have 'lying around', then use a voltmeter to measure the off-load voltage, as this is more like what the ETX will experience, but if the PSU is a low power output one, then the voltage will drop alarmingly when both motors are slewing, and you may well get the 'Motor unit failure' (low battery) message as the ETX stops. Best get the proper one. Cheers, Damian Davis, London.
Subject: ETX-90EC further review Sent: Friday, September 15, 2000 20:31:23 From: Tim.Sheets@AMCG.com (Sheets, Tim) It's Tim Sheets. I normally write you from my home email, which is email@example.com. Please post this latest installment of my review of the truly "Mighty" ETX90-EC w/Autostar... Well, after 2 weeks of ownership of my ETX, I finally encountered a few hours of relatively good conditions for giving this little beauty a real go at the skies. The skies have been clear for several days now, but, of course, the moon was nearly full and had been rising right at nightfall. Tonight, I got in a good 2 hours of really putting the ETX and Autostar through it's paces. As I mentioned in a previous post, the alignment of the Autostar is rather easy once you get the mount (table) level. I set the scope in it's home position, told it the date and time, and chose easy alignment. Within a few seconds the scope had slewed around to the bright red star Arcturus. The star, though not visible in the eyepiece was easily centered in the finderscope, and in turn, in the eyepiece. Next, the Autostar decided upon the much dimmer Alpharatz. Once again, the star was slightly out of the field of view of the standard 26mm Plossl, but was very obvious in the finderscope. A couple presses of the directional keys centered the star, enter was pressed, and the scope was successfully aligned. I was set up in my rural, yet suburban back yard. Street lamps and neighbor's porch lights added to the light pollution. However, the sky was quite clear, with the beautiful Milky Way dim, but readily visible. With no reference materials or charts with me, I decided to go after some of the more well known objects. I started with M13, the Great Globular Cluster in Hercules. After calling up the object in the extensive database of the Autostar, and pressing "GOTO", the scope began to slew towards the target. After a few seconds, the BEEP of the Autostar indicated that the object had been found. Foregoing the finderscope entirely, I went straight to the 26mm eyepiece. There it was, not centered but well within the field of view, the fuzzy ball of light that I expected to see. After a couple of presses of the slew keys, the object was centered. Even through my light polluted skies, the ETX gave me a wonderful view of this famous globular. Next, off to one of my favorites. Looking up, Vega, in Lyra was obvious about 2 degrees from the zenith. Alright, I thought to myself, let's go after the most famous of planetary nebulae, M57, the Ring Nebula. Once again, the Autostar slewed the scope to the object and placed it well within the field of view of the eyepiece. This particular object made the strongest case yet for the quality of the optics in this great device. At only 48X, under light polluted skies, the Ring shape of this nebula was readily obvious with averted vision, and visible on occasion when looking right at it. Over the next hour or so, I viewed the Eagle nebula, the Dumbbell Nebula, the Andromeda gallaxy, and a host of other deep space delights. All were readily visible, and within the eyepiece's field of view after the Autostar slewed to it. Though little detail could be made out of the objects, I suspect this was more a problem in my light cluttered location that with the resolving abilities of the ETX. Of about 15 objects I asked the Autostar to find for me, 12 or 13 were within the inner 50-60% of the FOV immediately upon the completion of the slew. The other couple were visible, and only one was on the extreme edge of the FOV. I am simply overwhelmed with the accuracy of the Autostar, and the optical quality of this scope. I would strongly recommend it to anyone as a first scope, or as a portable device for easy trips to dark skies. One note of disappointment. Though the tracking provided in Alt-Az mode by the Autostar is certainly usable, it is far from perfect. After placing one of several globulars that I viewed into the eyepiece, I stepped away from the scope long enough to have a smoke. Upon returning, the object was still in the field of view, but had drifted from center to the outer third of the FOV. I suspect utilizing an EQ mount would remedy this situation I hope to travel to darker skies tommorrow evening. If conditions are better, I may provide one more review. Thanks for allowing me to share this most pleasurable experience with you folks! Tim Tim Sheets NT/LAN Administrator American Color Graphics, Inc. Brentwood, TN
Subject: Fried electronics Sent: Friday, September 15, 2000 18:09:38 From: Anonymous Greetings (and kudos for the great site), My question to you is where do I go for information regarding the following? I made a DC adapter following the ../techtips/power2.html instructions. The power source I used is an old 12V X-acto hobby drill power supply. Polarity of the DC adapter tip was correct. I fried my etx. From what I recall of my college electronics course some 20-odd years ago, only the impedence of the circuit determines the drawn amps; should be able to plug it into the Grand Coulee Dam and the circuit would only draw the amps it needs. So why the fry? My etx's board was flaky before I started: it wouldn't come up in RA-track mode, handbox unresponsive, had to flip on and off again 5 to 10 times to get its attention. (I really, really, don't like to flip the power on and off. Electronic components like it even less.) Does Meade not disconnect the batteries when a DC source is present in the adapter socket? Did I zing the board with 24 volts? Any thoughts?Mike here: Sorry to hear this. The batteries ARE disconnected when a *proper* DC plug is inserted into the ETX. If the plug you used was not quite right (whatever "right" is) then perhaps the batteries were not disconnected. Let this be a further warning to others of what can happen.
Subject: surge in RA drive when adjusting at slower setting Sent: Tuesday, September 12, 2000 01:53:29 From: firstname.lastname@example.org (Chris Davis) Thanks to the enthusiasm of yourself and the good people who contribute to your pages, I have got back into astronomy as a hobby having pursued it as a profession for the last 10 years (can't tell you which star is which, just a hand wavey explanation as to how they work!). I have had my ETX90 EC for about a week now, running on the table tripod and powered by batteries and without Autostar. I've been blown away. This scope is far better than the cumbersome 4" refractor I used as an undergraduate student. Anyway, last night I was after M31. The scope was tracking fine and was trying to centre the image by setting the hand-controller to the slowest speed. At what seemed like random occasions however, the depression of the RA control would result in the scope slewing at (what sounded like) high speed and the image was momentarily lost. In under a second, the scope regained its senses and tracked at the slower speed again, but I now had to back track to where I was before I attempted the fine adjustment. I seem to remember seeing someone enquiring about the same 'feature' in your archives but, as these are so extensive, and I read through quite a few of them (therefore not leaving an obvious trail), I now can't find it again! Does this behaviour ring any bells? Cheers, Chris.Mike here: I don't explicitly recall this behavior with the standard electronic controller. There have been some reports of the Autostar exhibiting this. Power has been a suspected culprit. Or perhaps some dirt on the encoders. Or some other cause.
Subject: ETX90/EC Second Session Sent: Thursday, September 7, 2000 20:41:08 From: email@example.com (Tim Sheets) Please add this to my previously submitted initial observations of the ETX90/EC... After 2 nights of complete cloud cover, the skies opened up last night night enough to get in some more use of my new ETX90/EC. As I stepped out of my house with ETX in hand (note, hand, singular, very light, at just less than 9 lbs.), 2 bright "stars" rather close together in the eastern sky stood out strongly, as though they didn't belong. Hmmm, Jupiter and Saturn perhaps. As the area on my patio that I generally consider to be the area that I will do most of my viewing has a large row of very tall trees to the east, I decided to go ahead and sit the ETX down on my steeply sloped driveway as to avoid the obstruction and take a look at these objects that are so near and dear to most of us who enjoy the night sky. In a matter of seconds I had centered the first of the two objects in the 8x21 viewfinder. It was readily apparent even through the viewfinder that my assumption of this being a planet was correct. However, I did guess incorrectly as to which was which. Through the 48X 26mm standard equipment plossl, Saturn was small but brilliant. With less than perfect skies the Cassini division was not visible, but Titan was obvious. Once again I noted the incredibly clear optics of the ETX. After looking at this, my favorite object above all for several minutes (or was it hours?), I slewed the scope down to the other bright "star" and sure enough, there was the Jovian giant, in all it's glory. Once again, through the only eyepiece I currently own, the image of Jupiter was small but breathtaking. 3 of the four moons were obvious, and no less than 5 bands were visible on the disc, the cloud bands of Jupiter's atmosphere of course. Wow, the more I use this little wonder, the more I am impressed with the quaility of the optics. Ok, enough of the Solar system, let's get out in deep space. I took the scope down to the patio and placed her on the patio table. This is where my story gets frustrating. After 2 hours, well past midnight, on a work night, and many attempts at aligning the Autostar computer, I had to give up. It seemed no matter how much care I took in attempting to properly set the scope in it's proper home position, the alignment stars were never anywhere near the fov of even the finderscope after the ETX slewed to the "approximate" position that it thought the star's should be. After coming inside, and, though completely exhausted, reading extensively on the topic of alignment from Mike's great site, I believe I have realized my problem. From what I gather, reasonably accurate leveling of not only the OTA, but of the scopes mount (in this case, the patio table) is critical. I can say for certain that my patio, and therefore patio table, being on a hill, is far from level. The skies are completely overcast again tonight, but as soon as they clear, we'll get a level out, and get that table leveled and try again. More to come.... Tim
Subject: ETX90/EC First Night Sent: Monday, September 4, 2000 19:57:05 From: firstname.lastname@example.org (Tim Sheets) Well, I finally got up the nerve to tell my wife I was going to by a new telescope. I had decided on the DS114/EC as the cost was not overly prohibitive. But what I really wanted was the ETX90/EC. Well, I got to the mall, and walked in to the Discovery Channel store. I pointed at the DS114 to the sales guy and asked him to get one out and I'd take it. While I was waiting for him to return, I was pleasantly surprised to see that this local store had knocked the price of the ETX down to $507 in order to compete with a sale that the Natural Wonders store is running nation wide. So, after a little prodding I convinced my better half to allow me to buy the ETX90EC and #497 Autostar instead of the DS114EC and the #495 Autostar. After visits to several woman's clothing stores and such (had to go wherever she wanted after having just spent $700), I drove my new little toy home. Straight out of the box I was overwhelming pleased. The unit came very well packed and it was obvious that everything was there and in good shape. This is truly a wonderful looking little device. I installed the batteries and hooked up the standard hand controller. As was expected, I pressed the buttons and the sweet little scoped moved on command. One note of irritation is that the drives seem to have enough play as to cause a delay in full movement speed. For example, when pressing up, at full speed, the scope hesitated for a moment, then moved slowly at first, and finally full speed in the up direction. Though this is a bit annoying, I don't see it as a problem. Also, the gear noise that is commonly complained about was blatantly audible, but certainly not too loud as to become annoying. I simply don't see it as an issue. Well, at this point, it was early dusk. I decided to hook up the Autostar and take her outside to run the required one time training of the Autostar to match the specific gears in the scope. Easy as pie. First you aim the scope at any specific distant terrestrial object, then tell it to start, it moves the scope a bit to the left, then tells you to move it to the right using the directional keys to recenter the object and hit enter. Once you've accomplished this in all 4 directions, the training is complete. I was frustrated as the sky was still very hazily overcast and though it was nearing darkness, I couldn't see a single star. My 10 year old daughter quickly pointed out however that the moon was readily visible. Hmmm, ok, sounds good. I used manual controls to center the moon in the 8X21 finder, then moved to the 26mm eyepiece. I had to recenter the moon as my finder was not aligned well, but this was my doing. Once aligned, I was in awe. The terminator presented hundreds of beautifully displayed craters, as well as many Maria. Even through hazy skies, the presentation of Luna was overwhelming. Quite obviously superb quality optics. Now, if this darn haze will go away before I have to go off to bed. Will write more as soon as I get some clearer skies. Tonight, perhaps, but not likely. Tim Sheets
Subject: Re: Power Source Modification Sent: Wednesday, August 30, 2000 10:05:19 From: email@example.com I have a similar problem that was reported by Ron Marriotti on 3/20/00 titled "Power Source Modification" under technical tips - Misc. With my ETX90/EC, I also have the dec motor drive wildly 5 to 10 degrees when the Meade AC adapter is used. It usually occurs within 10-15 minutes of alignment and tracking. I also spoke with Meade tech support and they had only two suggestions: Use a surge protector and live with battery power only. I bought the Radio Shack RF filter, and a surge protector that Meade tech support suggested. Never a problem with batteries. I was excited to build Ron's voltage regulator and put it inside of the AC adapter housing after setting the voltage at 10V as specified. When I turn-on the scope, I see the power LED light momentarily and then go out. Went back to battery and see no problem, so I assumed that the regulator voltage was a bit too low. So I tried 11V, 12V, 13V and went to the max that the regulator would put-out (14.5V). Still the LED lights and then goes out. The raw voltage from the AC adapter is 15.5V. I'm not sure why Ron was able to get the 10V to work and mine doesn't. Anyone else have this problem? Any further commentary regarding the fix? Thanks for your effort in the web site. It sure is a great asset to ETX users. -Phil Watt
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