Guide Speed In Calibration Report

[Mike Jerry]

Perhaps a silly question, but is the RA and declination guide speed indicated in the calibration report below reporting the guiding rate set by the mount?

[Brian Valente]

Hi MIke

if you are referring to this part, yes that is the mount's reported guidespeed

On Thu, Apr 27, 2023 at 2:19 PM Mike Jerry <mjtransc...@gmail.com> wrote:

Perhaps a silly question, but is the RA and declination guide speed indicated in the calibration report below reporting the guiding rate set by the mount?

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Brian Valente

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[Mike Jerry]

Thanks Brian, that's what I thought.

I'm asking because I'm trying to change the guide rate for my AM5 and, no matter what I do, PHD2 is reporting the default 0.5x.

Onward...

Mike

[Brian Valente]

Where are you trying to set the mount guidespeed?

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[Mike Jerry]

In the ASI Mount program on the PC which installs with the ASCOM driver. So basically the setting change is being made in the driver itself before creating a new PHD2 hardware profile in which I mirror the changed guide rate.

[Bruce Waddington]

If you look in the top half of the calibration review dialog, you will see the measured guide speeds in units of arc-sec/px.  It is basically 0.5x sidereal, subject to some measurement uncertainty.  So the driver reports 0.5x as the guide speed (bottom panel), PHD2 measures the guide speed at 0.5x sidereal (top panel), so there it is.  It sounds like whatever you're doing with the configuration UI isn't accomplishing anything.

Good luck,

Bruce

[Mike Jerry]

Thanks Bruce. I agree, it looks like the driver isn't actually changing the guide rate, even when you change the setting. That at least narrows down the issue.

Mike

[mj.w...@gmail.com]

Hi Mike

I can relate to this.

Way back I found that a line of code in the LX200GPS driver changed the guide rate back to a default 0.66 as soon as PHD2 connected to the mount.

If I corrected the guide rate, in the mount, AFTER PHD2 was connected it "stuck" for that session.

Colin Dawson managed to correct that bug in his Generic driver.

Michael

Wiltshire UK

[Mike Jerry]

Thanks Michael. It is indeed looking like a driver issue.

One more question for you good folks: I want to experiment with different guiding rates in my mount. Assuming I can change it correctly in the ASCOM driver, after I make the change, should I run the wizard and generate a new profile or will a recalibration in the old profile suffice?

Mike

[Brian Valente]

Hi Mike

>>>One more question for you good folks: I want to experiment with different guiding rates in my mount. Assuming I can change it correctly in the ASCOM driver, after I make the change, should I run the wizard and generate a new profile or will a recalibration in the old profile suffice?

Assuming that is the ONLY thing you change, you can just recalibrate

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[Mike Jerry]

Yes, changing the guide rate in the driver is the only thing that I will change. Thanks Brian!

Mike

[Bruce Waddington]

This won’t work because it will run you into a bug that will be fixed in the next dev release.  Please do one of two things after you change the mount guide speed:

 

1.       Re-run the new-profile-wizard

2.      Open Advanced Settings, go to the ‘Guiding’ tab, then click on ‘Advanced’ to bring up the calibration step-size calculator.  Make sure all the fields in the form are correct including the new guide speed, then click on ‘Ok’ to close the dialog.  This will correctly adjust the calibration step-size.

 

Bruce

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[Mike Jerry]

Ah ha. Thanks Bruce.

Mike