Calibration drops after rotating to target.

[hugh...@gmail.com]

Hi,

I cannot get the calibration to remain valid after I have rotated to a target. My setup is as follows,

FSQ106, native F5 530mm

Nitecrawler rotator/focuser. QHY OAG with Ultrastar Pro.

all run through a Pegasus Astro UPBV2.

never seem to have an issue connecting rotator to PHD2 Dev and NINA at the same time.

attached are guidelogs. Calibration done on 2022-10-17.

Any help would be appreciated.

\

Thanks.

Matt

[Brian Valente]

Hi Matt

you need to send both the guidelog and matching debug log

please use the built-in log uploader utility

https://openphdguiding.org/getting-help/

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[hugh...@gmail.com]

ah ok. my bad. thanks.https://openphdguiding.org/logs/dl/PHD2_logs_7JZn.zip

https://openphdguiding.org/logs/dl/PHD2_logs_7JZn.zip

[steve]

Hi

Wrong order?

Rotate on target first, then calibrate.

Cheers and HTH

[hugh...@gmail.com]

Should it not matter? My understanding is that if I have the rotator attached and calibrate, slew to a target and rotate PHD2 should compensate.

A typical night would be to plate-solve and rotate on a target then calibrate PHD2 then back to the target. If I want to chnage to another target that involves with the plate-solve I shouldn’t have to re-calibrate? Otherwise what’s the point in connecting the rotator?  .

[Bruce Waddington]

Hi Hugh.   I'll take a look at this later today when I get some time.  As you say, it doesn't matter what order you do the calibration and rotation.

Bruce

[Brian Valente]

Hi Hugh

I have a rotator connected and it works as you might expect

I don't understand your workflow here: "A typical night would be to plate-solve and rotate on a target then calibrate PHD2 then back to the target."

The way to do it is to have everything connected and calibrate once (preferably at the intersection of meridian and celestial equator). Then when you slew to your new target including rotation, PHD will compensate for the rotation. 

 If you tear down and setup each night, I would probably do it at the start of each night

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[Bruce Waddington]

Hi again Hugh.  I've confirmed that the code works correctly and that PHD2 is getting rotator values from your equipment.  It looks like there's only one place in your logs where you started guiding at a different rotation than where you calibrated.  But I notice there's a 3+ hour gap there where nothing was happening.  Did you do anything in that time that would have *mechanically* changed the rotator position or the rotation of the camera?  If not, I think you should manually work through the scenarios to see what's happening.  Unless you know you mechanically rotated something before, I think the first thing to try is to reverse the rotator polarity option.  That's on the 'Other Devices' tab in Advanced Settings.  When you change that, you will need to do a fresh calibration.  So a test scenario would look like this:

1.  Change the 'reverse' option

2.  Do a fresh calibration

3.  Force the rotator to move to a different position.  The change should be pretty large so you can see the results quickly - 30-40 degrees should be enough.

4.  Start guiding

5.  If this doesn't work, reset the 'reverse' option and repeat steps 2-4

If it still doesn't work, send us the log files although I think one of these two will work.  You can see the reported position of the rotator using the 'Stats' window in PHD2.

Good luck,

Bruce

[A hwang]

Try to go to advanced settings. Then other devices tab. Check the reverse box for the rotator.

Set rotator to 0. Go to celestial equator and meridian and then calibrate. 

[The pick off mirror of the off axis guider is 1 reflective surface (odd number).]

Then try slew to target, solve, and rotate and see if it guides okay.

Allen

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[hugh...@gmail.com]

It’s just what I have todo to get the calibration to work. Get the right rotation then calibrate.

[hugh...@gmail.com]

Hi Allen and Bruce,

I’ll experiment and try to get it to work. I’ll start at the home position (0) each time. Thanks.

[hugh...@gmail.com]

ok.... finally a clear night (well morning). Attached are the guide logs but I managed to get it to work. I checked the reverse box under other as suggested and it worked perfectly. Thankyou everyone for your help.

https://openphdguiding.org/logs/dl/PHD2_logs_RdP3.zip

[Bruce Waddington]

Good, glad you got it sorted out.

 

Bruce

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