Despite claims the AM5 is "backlash free" AA is compensating 4 steps of backlash on calibration for a distance of 20.935
See the log below - mount is coming back from East Calibration at 3.060 distance from original starting point:
East,0,1.150,-2.835,1700.219,690.323,3.060
Then proceeds to clear 4 steps of backlash until the new starting point on the N_S axis is at 20.935
Backlash,0,0.000,0.000,1700.219,690.323,0.000
Backlash,1,4.419,-5.006,1695.800,695.329,6.677
Backlash,2,9.152,-10.402,1691.066,700.726,13.855
Backlash,3,13.678,-15.849,1686.540,706.172,20.935
Which will become North 0
The mount is obviously moving (position is changing=mount is moving=there is no backlash) so why this extra unneeded backlash steps?
Calibration log below:
_PHD2 version, Log version 2.5. Log enabled at 2022-09-25 01:30:07
Calibration Begins at 2022-09-25 01:30:07
Equipment Profile =
Camera = ZWO ASI174MM Mini
Exposure = 1000 ms
Pixel scale = 10.07 arc-sec/px, Binning = 1, Focal length = 120 mm
Mount = ZWO AM5, Calibration Step = 9000 ms, Assume orthogonal axes = no
Dec = -5.4 deg, Hour angle = -4.05 hr, Pier side = West, Rotator pos = N/A
Lock position = 1701.416, 687.451, Star position = 1701.585, 687.537, HFD = 4.37 px
Direction,Step,dx,dy,x,y,Dist
West,0,0.000,0.000,1701.368,687.488,0.000
West,1,-5.014,-4.616,1706.382,692.104,6.815
West,2,-10.595,-9.899,1711.963,697.387,14.500
West,3,-15.880,-14.974,1717.248,702.462,21.826
West,4,-21.087,-19.993,1722.455,707.481,29.058
West calibration complete. Angle = -136.5 deg, Rate = 0.807 px/sec, Parity = N/A
East,4,-21.087,-19.993,1722.455,707.481,29.058
East,3,-15.880,-16.017,1717.248,703.505,22.554
East,2,-10.123,-11.753,1711.491,699.241,15.511
East,1,-4.379,-7.328,1705.748,694.816,8.537
East,0,1.150,-2.835,1700.219,690.323,3.060
Backlash,0,0.000,0.000,1700.219,690.323,0.000
Backlash,1,4.419,-5.006,1695.800,695.329,6.677
Backlash,2,9.152,-10.402,1691.066,700.726,13.855
Backlash,3,13.678,-15.849,1686.540,706.172,20.935
North,0,0.000,0.000,1691.066,700.726,0.000
North,1,4.526,-5.447,1686.540,706.172,7.082
North,2,9.154,-11.334,1681.913,712.059,14.569
North,3,13.738,-17.199,1677.328,717.925,22.013
North,4,18.369,-22.816,1672.697,723.541,29.292
North calibration complete. Angle = 128.8 deg, Rate = 0.814 px/sec, Parity = N/A
South,4,18.369,-22.816,1672.697,723.541,29.292
South,3,15.689,-19.886,1675.377,720.612,25.330
South,2,11.411,-14.667,1679.656,715.393,18.583
South,1,7.563,-9.481,1683.503,710.207,12.128
South,0,3.516,-4.404,1687.550,705.130,5.635
Calibration complete, mount = ZWO AM5._