Hi Rolando, I've read WHWang's travails with the 150 on cloudynights. From your description below, isn't it obvious that he is under-mounted with the Mach2? The little engine that could is being

Hello again, I want to follow up with a bit more information and historical perspective for those interested in how mounts have evolved and why. Today's mounts are different from previous generation

And to answer your "how hard" question, it's easy and straightforward. Download the database file from A-P, and follow the instructions in a document named dataload201.pdf. I don't know where to find

Hi Christopher, That's quite a list of culprits. Slight chance it could be #s 4 and 8. Definitely #11 is playing a big part. Pier goes down 9 feet and is filled with a lot of concrete. Best wishes,

If the hand controller battery was replaced at some point then it is almost a certainty that the object database in the hand controller was corrupted by the bad battery, or got corrupted when the

PA is very good as evidenced by small corrections via PHD2. Best wishes, Michael

To me, some of the possibilities are: 1. Orthogonality/Cone-error. 2. Corrupted hand controller. 3. Misconfigured hand controller. 4. OTA/attachment mech problem. 5. Motor optical encoder problem. 6.

The shift key on a desktop keyboard and the shift key on a laptop keyboard will do the same thing. Like Roland, I do a fresh calibration every time I use the mount, even if it has been left outside

Keypad database corruption is generally catastrophic in terms of GoTos. Database corruption sends you to the complete wrong place - not just *off-by-a-bit*. And that's if you can slew to catalog

Thanks for the suggestions. I replaced the battery soon after I got the mount. The comparing the coordinates sounds like a good first step. How complicated is it to replace the database if

Exactly. Unless you already did, it would be worth replacing the keypad battery and updating the DB of objects. Scott Cooke

Could be anything, depends also on how far you are off. Without more specifics, we are shooting in the wind. Rolando

Is the object database in your keypad corrupted ? You might want to cross check the coordinates that you get from the keypad with the published coordinates. Mike

I truly love my AP900 GTO3 which I bought from the original owner a couple of years ago. However, I cannot get accurate GoTos no matter what I try. I use solely the had controller with the upgraded

May be if you overlap the frames you can understand if the star position after the event is restored in alignment with the previous frames or remains shifted. If it is recovered it is a transient

yes that is what in fact I am seeing.

Hi All, For those of you on CN, you may have seen this entry by Mr. Whang: https://www.cloudynights.com/topic/767964-lets-torture-the-mach-2/page-6#entry11425336 He has a 150TOA with fairly heavy

When you do Shift + Guide you will see PHD2 enter calibration mode and perform a calibration. There really is no confusion on whether it is doing a calibration or not. Try it and confirm for

I'm not an expert on PHD2, but for every new setup i do a new calibration. I do this for any imaging run because I'm always switching scopes and cameras and never have them perfectly lined up from the

I really appreciate the feedback. the entire community is enriched by your participation. That being said I do need to clarify something on this thread. As I have looked back at my guide screen, I