So you simply refuse to do the test I asked you for? Why? Roland Christen

Thanks Roland, that is a big help. So by checking the time we can check the crystal oscillator. And given the clock is not maintained during the power down state I will run the test with the mount

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Thank you Michael.

a) There is only one precision oscillator in the CP that does all functions, including setting the sidereal rate. b) I would have to ask Ray to answer that one c) the clock time is not maintained when

I am not absolutely certain the RA drift is due to an offset in the clock frequency, it is only a possibility among others. But I do like the idea of measuring the clock using the method you

According to our servo engineer: "The CP internal clock uses a crystal controlled oscillator with accuracy of 25ppm, or 0.0025% One way to test the oscillator is to read time of day, :SL#, and compare

Yes of course it does because I artificially change that rate by 0.1%. The internal clock we use is accurate to a very high precision. It does not drift to 0.1%. Your assumptions are wrong. Now, you

Hi Christopher, Take a look at the DONUTS article I posted above, ATrack, a software program I developed, follows closely what they did. In other words, to maintain the very high tracking accuracy,

The graph shows clearly that a small change in servo sidereal rate will result in a significant drift in RA, 10 arcsec over 700 seconds. Last night ATrack showed an average drift in RA of -0.01500

Craig, where are you observing that seeing allows you to keep a 1 arcsecond accuracy on a single pixel for several hours? Here on Mauna Kea we frequently get sub-arcsecond seeing but we can't even

Measured tracking rate over 600 seconds time period. Each 100 second segment used a precision lab encoder pulse count to determine the exact rate of axis rotation with respect to time. The result is

The ATrack design is very similar to DONUTS, introduced in 2013: https://www.jstor.org/stable/10.1086/670940?seq=1#metadata_info_tab_contents For high precision photometry it is very important that

Which points did he bring up that are significant to you.? You realize that tracking to sub-arc sec levels is quite possible and has been possible for many years. In your opinion, what are we

Ray, Many AP clients doing photometry REQUIRE that kind of 1 arc-sec precision and it seems achievable with the right approach. A number of us would like to know more about how to achieve it.

I use an 1100 mount with my Astro-Physics180 EDT and SBIG STXL16200. The 1100 handles this setup without any problems.Here is a photo: Best Regards Michael Hambrick ARLANXEO TSR Global Manufacturing

It's all about the moment arm. Long tube, weight on each end. The Mach 2 will support the weight. But it may have the Jello effect because of the long moment arm. Sent via the Samsung Galaxy

Hi Stuart, If I absolutely need the 1600 then that may be an option. Alternately I do have a Paramount MX (legacy) with a 90 lb payload capacity which may or may not suffice. The TEC 180 spec says

Is the 1600 out of reach financially? That is a big, long scope. So weight isn't the only issue. Stuart Heggie http://www.stuartheggie.com/ -- Stuart http://www.astrofoto.ca/stuartheggie/

Hello All, I have two AP refractors (130GTX and Stowaway). I am also on the April 2019 list for the Mach2 GTO and on waitlist for a TEC 180FL. I use either a SBIG ST8300M + FW or Proline FLI 16803