my understanding of the principle of operation is, that the algorithm is not depending on a perfect alignment of the scope or camera in relation to the mount axis. The algorithm will always find the point in the sky around which the axis of the mount revolves, i.e. the MOUNT will be polar aligned. Whether your scope is parallel to the mount axis or not is a different question. So even with a pefectly polar aligned mount axis you could still have a cone error. But the PA algorithm should not be affected by this.
Probably Hy can comment on this as I just derive this from my theoritical understanding.

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@KD6AWA: easiest way to find the code of your mount may be to connect via EQmod. Go to the "Firmware" tab within the EQmod - indi control panel and look-up the value under "Mount Code".

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Dirk Tetzlaff created a new topic ' OAG focus monitor' in the forum. 3 months ago

I just wonder, whether the following implementation would make sense: while guiding with an OAG the HFR of the guide star(s) is constantly beeing measured. To get reliable results, the average of every x exposures is being recorded. Based on these values a moving average is being calculated. When the system moves out of focus, the HFR gets worse and hence at some point the most recent HFR value will surpass the moving average (last n (e.g. 20) measurements). One could set a threshold value (e.g. HFR +10%) and once this is surpassed the imaging run is paused at the end of the current exposure, the autofocus routine is being initiated and thereafter the imaging session continues.
This idea is derived from the ONAG real time autofocus. While the ONAG seems to correct the focus while imaging, the idea here is simply to gain an indication, if and when the imaging train moved out of focus (mirror flop, temperature change, other) by a pre-defined threshold.
All the critical algorithms and data are already there: the autoguide makes an exposure every n-second(s) anyway, the HFR value could be measured by the same algorithms used for autofocus. It is simply a question of calculating the HFR value, the average and comparing the actual values to a moving average; additional system load should be minimal. Only flip side I can think of is that this approach can not differentiate between change of HFR values due to "out of focus causes" and variable seeing-conditions. But even this could be build into an additional feature: if the focus can not be enhanced (i.e. because of deteriorated seeing conditions), the imaging run could be paused and restarted once HFR values get better again. 
Anybody thought about that ? Does this make sense ?

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Again, haven´t experienced any of those crashes with my setup. Have you tried a differently rated SD card or an USB SSD ?

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Dirk Tetzlaff replied to the topic 'Skywatcher Alt-Az backlash' in the forum. 3 months ago

some further information regarding the issue: even though it appears the same as backlash compensation, it apparantly has a different root cause. Here is part of the log file. First part is with tracking enabled, the second part is with tracking disabled (which can only be turned on/off via indi control panel, not with the ekos panel). With tracking disabled the backtracking move does not occur, only with tracking enabled. Does the encoder readout initiate the backtracking ? Can I disable this ? Can anybody please give a hint, here ?

/w tracking enabled:

[2021-03-13T12:16:13.450 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] SkywatcherAPIMount::Goto "
[2021-03-13T12:16:13.450 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] RA 8.566670 DEC 60.416700 "
[2021-03-13T12:16:13.452 CET INFO ][           org.kde.kstars.indi] - Skywatcher Alt-Az :  "[INFO] New Tracking target RA  8:34:00 DEC 60:25:00 "
[2021-03-13T12:16:13.452 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Celestial to telescope - Actual Alt 28.736193 Az 22.181683"
[2021-03-13T12:16:13.452 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Celestial to telescope - Apparent Alt 28.736193 Az 22.181683"
[2021-03-13T12:16:13.452 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.811949 y -0.331047 z 0.480777 "
[2021-03-13T12:16:13.452 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Conversion OK "
[2021-03-13T12:16:13.453 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] New Altitude 28.736193 degrees 735646 microsteps Azimuth 22.181683 degrees 567851 microsteps "
[2021-03-13T12:16:13.473 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Initial Axis2 8388608 microsteps Axis1 8388608 microsteps "
[2021-03-13T12:16:13.473 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Current Axis2 9124392 microsteps Axis1 8955906 microsteps "
[2021-03-13T12:16:13.474 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Altitude offset -138 microsteps Azimuth offset 553 microsteps "
[2021-03-13T12:16:13.476 CET INFO ][           org.kde.kstars.indi] - Skywatcher Alt-Az :  "[INFO] SlewTo axis: 0 offset: 553 "
[2021-03-13T12:16:13.478 CET INFO ][           org.kde.kstars.indi] - Skywatcher Alt-Az :  "[INFO] SlewTo axis 0 Offset 553 CurrentEncoder 8955906 SlewToTarget 8956459 "
[2021-03-13T12:16:13.493 CET INFO ][           org.kde.kstars.indi] - Skywatcher Alt-Az :  "[INFO] SlewTo axis: 1 offset: -138 "
[2021-03-13T12:16:13.497 CET INFO ][           org.kde.kstars.indi] - Skywatcher Alt-Az :  "[INFO] SlewTo axis 1 Offset -138 CurrentEncoder 9124392 SlewToTarget 9124254 "
[2021-03-13T12:16:13.964 CET DEBG ][     org.kde.kstars.ekos.mount] - Mount status changed from  "Idle"  to  "Slewing"
[2021-03-13T12:16:13.971 CET INFO ][     org.kde.kstars.ekos.guide] - "Mount is moving. Resetting calibration..."
[2021-03-13T12:16:13.972 CET INFO ][     org.kde.kstars.ekos.guide] - "Calibration is cleared."
[2021-03-13T12:16:14.445 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] SkywatcherAPIMount::ReadScopeStatus "
[2021-03-13T12:16:14.483 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis2 encoder 9124254 initial 8388608 alt(degrees) 28.736172 "
[2021-03-13T12:16:14.483 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis1 encoder 8956459 initial 8388608 az(degrees) 22.181680 "
[2021-03-13T12:16:14.483 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.811949 y -0.331047 z 0.480777 "
[2021-03-13T12:16:14.484 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to celestial - Apparent Alt 28.736172 Az 22.181680"
[2021-03-13T12:16:14.484 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ApparentVector x 0.811949 y -0.331047 z 0.480777"
[2021-03-13T12:16:14.484 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ActualVector x 0.811949 y -0.331047 z 0.480777"
[2021-03-13T12:16:14.484 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to Celestial - Actual Alt 28.736172 Az 22.181680"
[2021-03-13T12:16:14.484 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Conversion OK "
[2021-03-13T12:16:14.484 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] New RA 8.566666 (hours) DEC 60.416682 (degrees) "
[2021-03-13T12:16:14.487 CET INFO ][           org.kde.kstars.indi] - Skywatcher Alt-Az :  "[INFO] Slewing started "
[2021-03-13T12:16:15.483 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] SkywatcherAPIMount::ReadScopeStatus "
[2021-03-13T12:16:15.511 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis2 encoder 9124254 initial 8388608 alt(degrees) 28.736172 "
[2021-03-13T12:16:15.511 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis1 encoder 8956459 initial 8388608 az(degrees) 22.181680 "
[2021-03-13T12:16:15.512 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.811949 y -0.331047 z 0.480777 "
[2021-03-13T12:16:15.512 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to celestial - Apparent Alt 28.736172 Az 22.181680"
[2021-03-13T12:16:15.512 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ApparentVector x 0.811949 y -0.331047 z 0.480777"
[2021-03-13T12:16:15.513 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ActualVector x 0.811949 y -0.331047 z 0.480777"
[2021-03-13T12:16:15.514 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to Celestial - Actual Alt 28.736172 Az 22.181680"
[2021-03-13T12:16:15.514 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Conversion OK "
[2021-03-13T12:16:15.515 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] New RA 8.566952 (hours) DEC 60.416682 (degrees) "
[2021-03-13T12:16:15.522 CET INFO ][           org.kde.kstars.indi] - Skywatcher Alt-Az :  "[INFO] Tracking started "
[2021-03-13T12:16:15.523 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Celestial to telescope - Actual Alt 28.739072 Az 22.188105"
[2021-03-13T12:16:15.523 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Celestial to telescope - Apparent Alt 28.739072 Az 22.188105"
[2021-03-13T12:16:15.524 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.811889 y -0.331129 z 0.480822 "
[2021-03-13T12:16:15.524 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Tracking AXIS1 CurrentEncoder 8956459 OldTrackingTarget 8957762 AXIS2 CurrentEncoder 9124254 OldTrackingTarget 9131076 "
[2021-03-13T12:16:15.525 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] New Tracking Target Altitude 28.739072 degrees 735720 microsteps Azimuth 22.188105 degrees 568015 microsteps "
[2021-03-13T12:16:15.526 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] New Tracking Target AltitudeOffset 74 microsteps AzimuthOffset 164 microsteps "
[2021-03-13T12:16:15.526 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SetClockTicksPerMicrostep "
[2021-03-13T12:16:15.527 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Tracking - AXIS1 restart "
[2021-03-13T12:16:15.527 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Tracking - AXIS1 offset 164 microsteps rate 97560 direction 0 "
[2021-03-13T12:16:15.528 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SetClockTicksPerMicrostep "
[2021-03-13T12:16:15.553 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Tracking - AXIS2 restart "
[2021-03-13T12:16:15.554 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Tracking - AXIS2 offset 74 microsteps rate 216216 direction 0 "
[2021-03-13T12:16:15.554 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Tracking - AXIS1 error 1303 AXIS2 error 6822 "
[2021-03-13T12:16:15.964 CET DEBG ][     org.kde.kstars.ekos.mount] - Mount status changed from  "Slewing"  to  "Tracking"
[2021-03-13T12:16:15.964 CET DEBG ][     org.kde.kstars.ekos.mount] - Slew finished, MFStatus  "FLIP_NONE"

/w tracking disabled:
[2021-03-13T12:15:32.966 CET DEBG ][     org.kde.kstars.ekos.mount] - Mount status changed from  "Tracking"  to  "Idle"
[2021-03-13T12:15:33.338 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] SkywatcherAPIMount::ReadScopeStatus "
[2021-03-13T12:15:33.427 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis2 encoder 9131072 initial 8388608 alt(degrees) 29.002500 "
[2021-03-13T12:15:33.429 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis1 encoder 8957753 initial 8388608 az(degrees) 22.232227 "
[2021-03-13T12:15:33.429 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.809579 y -0.330914 z 0.484848 "
[2021-03-13T12:15:33.429 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to celestial - Apparent Alt 29.002500 Az 22.232227"
[2021-03-13T12:15:33.430 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ApparentVector x 0.809579 y -0.330914 z 0.484848"
[2021-03-13T12:15:33.430 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ActualVector x 0.809579 y -0.330914 z 0.484848"
[2021-03-13T12:15:33.430 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to Celestial - Actual Alt 29.002500 Az 22.232227"
[2021-03-13T12:15:33.431 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Conversion OK "
[2021-03-13T12:15:33.431 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] New RA 8.533380 (hours) DEC 60.633300 (degrees) "
[2021-03-13T12:15:33.448 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SkywatcherAPIMount::MoveNS "
[2021-03-13T12:15:33.450 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Starting Slew South "
[2021-03-13T12:15:33.451 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Slew axis: 1 speed: -0.004667 "
[2021-03-13T12:15:33.457 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SetClockTicksPerMicrostep "
[2021-03-13T12:15:33.965 CET DEBG ][     org.kde.kstars.ekos.mount] - Mount status changed from  "Idle"  to  "Moving S"
[2021-03-13T12:15:34.156 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SkywatcherAPIMount::MoveNS "
[2021-03-13T12:15:34.157 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Stopping Slew South "
[2021-03-13T12:15:34.429 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] SkywatcherAPIMount::ReadScopeStatus "
[2021-03-13T12:15:34.432 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis2 encoder 9126345 initial 8388608 alt(degrees) 28.817852 "
[2021-03-13T12:15:34.432 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis1 encoder 8957753 initial 8388608 az(degrees) 22.232227 "
[2021-03-13T12:15:34.433 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.811021 y -0.331504 z 0.482027 "
[2021-03-13T12:15:34.433 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to celestial - Apparent Alt 28.817852 Az 22.232227"
[2021-03-13T12:15:34.433 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ApparentVector x 0.811021 y -0.331504 z 0.482027"
[2021-03-13T12:15:34.434 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ActualVector x 0.811021 y -0.331504 z 0.482027"
[2021-03-13T12:15:34.434 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to Celestial - Actual Alt 28.817852 Az 22.232227"
[2021-03-13T12:15:34.435 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Conversion OK "
[2021-03-13T12:15:34.435 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] New RA 8.545136 (hours) DEC 60.469166 (degrees) "
[2021-03-13T12:15:34.965 CET DEBG ][     org.kde.kstars.ekos.mount] - Mount status changed from  "Moving "  to  "Idle"
[2021-03-13T12:15:35.398 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] SkywatcherAPIMount::ReadScopeStatus "
[2021-03-13T12:15:35.420 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis2 encoder 9126345 initial 8388608 alt(degrees) 28.817852 "
[2021-03-13T12:15:35.421 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis1 encoder 8957753 initial 8388608 az(degrees) 22.232227 "
[2021-03-13T12:15:35.422 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.811021 y -0.331504 z 0.482027 "
[2021-03-13T12:15:35.423 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to celestial - Apparent Alt 28.817852 Az 22.232227"
[2021-03-13T12:15:35.424 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ApparentVector x 0.811021 y -0.331504 z 0.482027"
[2021-03-13T12:15:35.424 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ActualVector x 0.811021 y -0.331504 z 0.482027"
[2021-03-13T12:15:35.425 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to Celestial - Actual Alt 28.817852 Az 22.232227"
[2021-03-13T12:15:35.425 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Conversion OK "
[2021-03-13T12:15:35.426 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] New RA 8.545422 (hours) DEC 60.469166 (degrees) "
[2021-03-13T12:15:35.650 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SkywatcherAPIMount::MoveNS "
[2021-03-13T12:15:35.651 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Starting Slew South "
[2021-03-13T12:15:35.651 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Slew axis: 1 speed: -0.004667 "
[2021-03-13T12:15:35.660 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SetClockTicksPerMicrostep "
[2021-03-13T12:15:35.672 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SkywatcherAPIMount::MoveWE "
[2021-03-13T12:15:35.673 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Starting Slew West "
[2021-03-13T12:15:35.673 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Slew axis: 0 speed: -0.004667 "
[2021-03-13T12:15:35.681 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SetClockTicksPerMicrostep "
[2021-03-13T12:15:35.951 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SkywatcherAPIMount::MoveNS "
[2021-03-13T12:15:35.952 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Stopping Slew South "
[2021-03-13T12:15:35.956 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] SkywatcherAPIMount::MoveWE "
[2021-03-13T12:15:35.956 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[SCOPE] Stopping Slew West "
[2021-03-13T12:15:36.420 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] SkywatcherAPIMount::ReadScopeStatus "
[2021-03-13T12:15:36.448 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis2 encoder 9124392 initial 8388608 alt(degrees) 28.741563 "
[2021-03-13T12:15:36.449 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Axis1 encoder 8955906 initial 8388608 az(degrees) 22.160078 "
[2021-03-13T12:15:36.449 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] TDV x 0.812032 y -0.330724 z 0.480860 "
[2021-03-13T12:15:36.449 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to celestial - Apparent Alt 28.741563 Az 22.160078"
[2021-03-13T12:15:36.449 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ApparentVector x 0.812032 y -0.330724 z 0.480860"
[2021-03-13T12:15:36.450 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] ActualVector x 0.812032 y -0.330724 z 0.480860"
[2021-03-13T12:15:36.450 CET DEBG ][           org.kde.kstars.indi] - AlignmentSubSystem: "[ALIGNMENT] Telescope to Celestial - Actual Alt 28.741563 Az 22.160078"
[2021-03-13T12:15:36.450 CET DEBG ][           org.kde.kstars.indi] - Skywatcher Alt-Az : "[ALIGNMENT] Conversion OK "

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Dirk Tetzlaff created a new topic ' Skywatcher Alt-Az backlash' in the forum. 3 months ago

When using the Skywatcher Alt-Az driver for my Az-Eq 6 for visual observation, my mount will perform a backlash compensation after every manual slew with the joystick. I could not see any backlash option in the indi control panel tabs, nor in the code itself. Does anybody else observe this behaviour ? Any ideas how to disable this ?

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I think the speed setting ist called "usb bandwidth" and you can set it in the controls tab (the tab where you set offset, gain, WB etc.).
The images are huge indeed, but 20 megapixel with 2 byte per pixel plus some overhead give you exactly this size when not compressed.

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just a thought: may this problem be related to the usb speed setting ? I have mine at 40%. No crashes.
Are you using USB 3.0 cables or USB 2.0 cables ?

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just to follow up on my testing: had one night of clear skys last week. The Alt-Az driver did work with my Az-Eq 6 with the limitations described earlier by geehalel:
- solve & slew to target works great
- no syncing
- tracking somewhat choppy
- guiding of no use

regarding the two last points: tracking probably ok for visual observation. While taking pictures it would coarsely change position (couple of arcminutes) every 40 secs or so. Tried to enable guiding: calibration successful, but RMS around 4 arcsecs, which is probably of no good use. My perception was the bad guiding is connected to these coarse changes of position while tracking (guiding in same seeing conditions with eqmod around 0.6 - 0.8 arcsecs). Another issue I noticed is my mount is somewhat backtracking manual slewing (like a very strong backlash compensation). Had no backlash enabled, though (have no options to do so).

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just to reconfirm:
my config:
- Pi 4 4GB
- Stellarmate beta channel (last update approx. 2 weeks ago)
- Asi 2600 MC
- Asi 290 (guidescope)
- EQmod (AZ-EQ 6)
- Celestron focuser
- Deep Sky Dad focuser
- Joystick
- Skysafari

I ran this system live last week (first clear sky for weeks; only one night, unfortunately). Took approx. 100 exposures whith guiding enabled. No crashes.

I had a very similar problem with my system crashing while operating the 2600 MC in parallel to my QHY 178III. This problem did not occur when I used Zwo cams only and it completely vanished now. I had this cam temporarily used on my equipment with a 50mm CCTV lens I attached, which gives me a 8 degree fov for the new PA routine. Again, no crashes.

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Dirk Tetzlaff replied to the topic 'hand compiling indi' in the forum. 5 months ago

The more I work with linux, the more I realize how little I know. Did the strip-all of my bin file. It came out at 174k (down from 584k), but still almost double the size of the stellarmate or astroberry version. What else could I do, to shrink it ? Is there any option I can use for compilation to get the smallest possible binary ?

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This sounds like a very nice feature ! Many thanks !!!
Currently, due to weather conditions, I am limited to simulation. I am struggling to set up my simulator with deliberate erros. I tried various settings within the "Simulator Config", i.e. PAE, EQ PE, but I only get some misalignemt for "normal" alignment. With the PAA I always get a perfect PA. Can someone hint me in the right direction, please ?

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Dirk Tetzlaff created a new topic ' GSC missing on beta channel ?' in the forum. 5 months ago

I just switched to the beta channel to have the latest skywatcher_AltAz driver. But I am now missing the GSC database. Tried to install it with "sudo apt install gsc" but I get an "unable to locate package gsc" in response. Can somebody help, please ?

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