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GTD E.fric, User Manual

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GTD E.fric User Manual Download Page 7

Onstep) proportionally (same percent) as the error is of the total goto distance.

Below is an example for testing goto precision in DEC 

Improving flip precision (optional)

The largest source of pointing error when the moun is making a meridian flip is 
optical axis/dec axis orthogonality error. Use trimming grub-screws (or shims) 
between the losmandy rail and one of the tube rings.

GTD E.fric manual

  7  

March 2021

Summary of Contents for E.fric

Page 1: ...ripod or pier should be approximately levelled to avoid cross interference between azimuth and elevation when polar alignment is done GTD E fric manual 1 March 2021 Potential finger trap do not insert your finger into the elevation base while adjusting elevation It may injure your finger Hazard to the drive electronics do not rotate manually the axes of the mount with locked clutches and connected...

Page 2: ...in the mount s range up to 84mm Operating the E fric Connect the electronics one of many optional choices with your motor cable supplied on request The supply voltage to the electronics should NOT be under 12V GTD E fric manual 2 March 2021 RA axis lock clckwise closed DEC axis lock clockwise closed RA Motor connector DEC motor connector ...

Page 3: ... pier This does not limit automated operation since this part of the sky is reached with the OTA on the WEST side of the pier Balancing Mount the OTA with the sky end corresponding to the SKY sign on the losmandy platform This will ensure that the locking knobs do not interfere with the mount body You can replace the long knobs with M6x40 cylindrical head bolts GTD E fric manual 3 March 2021 Sky e...

Page 4: ...some positions not all The top and bottom of the OTA are symmetric positions any side mounted accessory should be balanced You see some tips for fine tuning the balance above GTD E fric manual 4 March 2021 Losmandy knobs on left Tubering knobs on right Focuser knob On top bottom ...

Page 5: ...remove or add accessories after polar alignment because it will hamper precision Keep the central locking tight while adjusting The mount will be able to rotate smoothly on the hard plastic pads Below is the result of the polar alignment process with Sharpcap GTD E fric manual 5 March 2021 Azimuth control Elevation control Final adjustmet UP Loose for adjustment Lock gently after Adjustment check ...

Page 6: ...rosshair Apply refraction correction Onstep The suggested goto distance is 15 30 degree No meridian flip Ideally move in one coordinate only at a time Ra or Dec Use bright stars that are close in DEC for Ra test or close in Ra for DEC test Avoid positions near the horizon If the mount travels LESS INCrease the reduction microsteps 1 degree in GTD E fric manual 6 March 2021 ...

Page 7: ... testing goto precision in DEC Improving flip precision optional The largest source of pointing error when the moun is making a meridian flip is optical axis dec axis orthogonality error Use trimming grub screws or shims between the losmandy rail and one of the tube rings GTD E fric manual 7 March 2021 ...

Page 8: ...r alignment around 10 or multi star model will have field rotation near the pole Keep flexure at a minimum Pay attention to lock focuser extension rings set screws Remember that any part of your OTA that is not PERFECTLY firm will flex easily Do not leave cables hanging off the OTA CCD Apply refraction corrected tracking preferably with atmospheric parameters sensor for Onstep Generally speaking r...

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