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Absolute Encoders status
What conditions/actions will cause the Absolute Encoders to go into the "Set" condition? I have a GTO1600AE/CP4 and when I ran the APAE utility it showed the status of the encoders as "Set". I changed
What conditions/actions will cause the Absolute Encoders to go into the "Set" condition? I have a GTO1600AE/CP4 and when I ran the APAE utility it showed the status of the encoders as "Set". I changed
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By
Craig Young
· #73097
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APPC refraction correction question
That is great news. Still have not had a clear night yet to try 3 arc lines, weather forecast is showing early next week .. I think the night of the full moon (typical). When using 3 arc lines, what w
That is great news. Still have not had a clear night yet to try 3 arc lines, weather forecast is showing early next week .. I think the night of the full moon (typical). When using 3 arc lines, what w
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By
Craig Young
· #72129
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APPC refraction correction question
Hi Dean, Thanks for sharing your tracking results using DEC arc modeling, this is very useful information for others looking to try it. Looks like 3 arcs works very well, do you know if 2 arcs works?
Hi Dean, Thanks for sharing your tracking results using DEC arc modeling, this is very useful information for others looking to try it. Looks like 3 arcs works very well, do you know if 2 arcs works?
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By
Craig Young
· #72103
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APPC refraction correction question
I will give that a try on my next clear night. First, I will create a new model with two DEC arcs, with the target DEC arc sitting between the two sample arcs. That way the model straddles equally eit
I will give that a try on my next clear night. First, I will create a new model with two DEC arcs, with the target DEC arc sitting between the two sample arcs. That way the model straddles equally eit
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By
Craig Young
· #72088
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APPC refraction correction question
Thanks Ray. Here is the pnt file. It consists of 22 samples along a DEC arc of -15 degrees from HA -3 to the meridian. With refraction correction turned off the Offset error in HA is -170.12. With ref
Thanks Ray. Here is the pnt file. It consists of 22 samples along a DEC arc of -15 degrees from HA -3 to the meridian. With refraction correction turned off the Offset error in HA is -170.12. With ref
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By
Craig Young
· #72074
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APPC refraction correction question
That is what I said in my first post to this thread, that others are using this temporarily, but it would be useful to summarize the process for others who are not familiar with the technique to try i
That is what I said in my first post to this thread, that others are using this temporarily, but it would be useful to summarize the process for others who are not familiar with the technique to try i
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By
Craig Young
· #72072
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APPC refraction correction question
Dean, Actually, you can try DEC ARC modelling now. It is very simple, fast and easy to setup. Here is what you do: 1. Run APCC (I am running latest version (v1.8.2.1) 2. Click Pointing Model tab 3. Cl
Dean, Actually, you can try DEC ARC modelling now. It is very simple, fast and easy to setup. Here is what you do: 1. Run APCC (I am running latest version (v1.8.2.1) 2. Click Pointing Model tab 3. Cl
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By
Craig Young
· #72070
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APPC refraction correction question
Call it what you want Ray, the fact is it does work, as long as you do not use the Offset Error terms with refraction. And it is a lot easier to say than "Building an APPM model by sampling only point
Call it what you want Ray, the fact is it does work, as long as you do not use the Offset Error terms with refraction. And it is a lot easier to say than "Building an APPM model by sampling only point
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By
Craig Young
· #72067
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APPC refraction correction question
Can anyone, who is using APPM to build DEC ARC models, confirm that enabling refraction correction changes the model terms significantly. You can easily run this test during the day by slewing to any
Can anyone, who is using APPM to build DEC ARC models, confirm that enabling refraction correction changes the model terms significantly. You can easily run this test during the day by slewing to any
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By
Craig Young
· #72065
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APPC refraction correction question
The problem appears to be related to the Offset Error - Hour Angle term in the model. If this term is checked AND refraction correction unchecked then the model term value in the box is -170.12. If I
The problem appears to be related to the Offset Error - Hour Angle term in the model. If this term is checked AND refraction correction unchecked then the model term value in the box is -170.12. If I
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By
Craig Young
· #72019
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APPC refraction correction question
Recently I read here on the forum of others using APPM to create DEC arc models and getting good results when doing unguided images so I thought I would give it a try since previous attempts using a w
Recently I read here on the forum of others using APPM to create DEC arc models and getting good results when doing unguided images so I thought I would give it a try since previous attempts using a w
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By
Craig Young
· #71943
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Adjust CP4 Clock Frequency
Roland, I ran the clock test for 12 hours and there was no drift in the time. That would indicate the crystal oscillator is well within the accuracy required since a 0.1% drift would be 43 seconds in
Roland, I ran the clock test for 12 hours and there was no drift in the time. That would indicate the crystal oscillator is well within the accuracy required since a 0.1% drift would be 43 seconds in
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By
Craig Young
· #70219
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Adjust CP4 Clock Frequency
Roland, two tests were requested. The first one I think was to put tape on the mount to measure the RA drift after 24 hours. I believe this was done to check the sidereal rate. Assuming the sidereal r
Roland, two tests were requested. The first one I think was to put tape on the mount to measure the RA drift after 24 hours. I believe this was done to check the sidereal rate. Assuming the sidereal r
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By
Craig Young
· #70211
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Adjust CP4 Clock Frequency
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 alw
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 alw
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By
Craig Young
· #70207
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Adjust CP4 Clock Frequency
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 described
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 described
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By
Craig Young
· #70203
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Adjust CP4 Clock Frequency
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, AT
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, AT
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By
Craig Young
· #70200
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Adjust CP4 Clock Frequency
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 arc
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 arc
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By
Craig Young
· #70199
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Adjust CP4 Clock Frequency
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 th
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 th
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By
Craig Young
· #70196
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Adjust CP4 Clock Frequency
Ray, So if I understand correctly, using your scope, unguided, and with APCC corrective tracking, you can plate solve your first image, three hours later plate solve your last image and the difference
Ray, So if I understand correctly, using your scope, unguided, and with APCC corrective tracking, you can plate solve your first image, three hours later plate solve your last image and the difference
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By
Craig Young
· #70183
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Adjust CP4 Clock Frequency
Ray, No problem, let me know if you want to discuss further offline. But as I said above, it is not really necessary because ATrack provides excellent tracking with whatever condition the scope/mount
Ray, No problem, let me know if you want to discuss further offline. But as I said above, it is not really necessary because ATrack provides excellent tracking with whatever condition the scope/mount
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By
Craig Young
· #70179
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