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GTD G53F, User Manual

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GTD G53F User Manual Download Page 5

Adjusting Polar Elevation and Azimuth

The adjustment range of the elevation screw is cca 20 degrees. If you need 
more adjustment you have to reposition the RA head in the elevation plates 
as explained below.

1 Remove the DEC head from the RA head. This makes the procedure much 
more easy to do.

2 Turn the elevation screw close to the OUT position. (when the threaded rod 
has most of its length between the two cross rods) This makes the procedure 
easier.

3 Remove both elevation locks and the centering rings which are below the 
locks. These come out if you release all load on them by turning the mount 
head on its side for example.

4 Pull out backwards the RA head from the fork base.

G53F manual ver 2.7

p5   June 2017

www.geminitelescope.com

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Summary of Contents for G53F

Page 1: ...motor reduction gear Gemini Fluido and the drive roller The drive roller is pushed against the drive disk with the torque limited lock knob The gearing has an integrated slip clutch that prevets demage to the drive roller and the gearing itself To ensure high goto precison encoders are fitted directly to both axes The encoders correct any slip that may occur if the slip clutch enters in action or ...

Page 2: ...ameters Non default values only Total Red enter 350 the exact value will be calculated by Pulsar2 Track current 850mA GoTo current 1200mA Stop current 400mA or 800 for guided photography Motor step R D 400 Encoders Mount encoders are fitted answer Yes to Mount encoder RA and DEC answer No to Motor encoder RA and DEC Resolution 72 000 both RA and DEC Rotation leave as it is will be defined by Pulsa...

Page 3: ...e if left alone in an unsuitably horizontal position Make sure the orienting pin in the lower saddle engages the hole in the DEC head This ensures the correct contact of the DB9 connector 2 Next place the upper saddle on the DEC head as shown below Find the position when the bolts enter their relative threaded holes in the lower saddle The gaps at the two sides should be approximately equal G53F m...

Page 4: ...es frequently Fasten them firmly finally You will need a 6 mm Allen key hexagonal You are ready now Disassembling is the reverse of assembling G53F manual ver 2 7 p4 June 2017 www geminitelescope com Gap on either side should be approx equal ...

Page 5: ...e much more easy to do 2 Turn the elevation screw close to the OUT position when the threaded rod has most of its length between the two cross rods This makes the procedure easier 3 Remove both elevation locks and the centering rings which are below the locks These come out if you release all load on them by turning the mount head on its side for example 4 Pull out backwards the RA head from the f...

Page 6: ... DEC head To fine adjust elevation and azimuth use the screws indicated below 1 turn of the elevation screw is cca 0 6 degree change in elevation Connecting Cables You need to connect 3 plugs to Pulsar2 and one to the G53F The rest is routed internally You also have a power plug routed to the RA head to supply all your 12V DC equipment on the scope without additional cables G53F manual ver 2 7 p6 ...

Page 7: ...2h with a hard stop Do not attemp to force it over this position The DEC axis can be rotated without restriction Pulsar2 side of cable connections shown below The cable is cca 60 cm long No damage will occur if you swap the encoder cables but the mount will not operate correctly The plugs are marked R and D for identification G53F manual ver 2 7 p7 June 2017 www geminitelescope com ...

Page 8: ...Mount side connector G53F manual ver 2 7 p8 June 2017 www geminitelescope com RA lock knob DEC lock knob Losmandy lock knobs ...

Page 9: ...t you will want to do the automatic setup process which calculates the total reduction and the encoder direction Insert the counterweight shaft and lock the axes by turning both red knobs right until you hear a click The mount is well balanced with the counterweight shaft remove any load from the telescope platform Correct position for running Red autoset G53F manual ver 2 7 p9 June 2017 www gemin...

Page 10: ... as applicable to your situation and skill Have the parameters set up correctly see First time setup paragraph Set User parameters Goto mode Pulsar2 logic This is for GE mounts like the G53F Set also DEC rotation for the flip as explained on p13 Have the mount decently polar aligned got precision heavily depends on polar alignment Turn the GPS on to refresh time UT and position The GPS is behind t...

Page 11: ...on signal of the encoders sent once in every full rotation of the axes and use this as a reference for initializing the mount You still need to be polar aligned and have time UT and lat long in decimals set correctly With this feature you can initialize the G53F remotely using only an IP camera as your eyes To save a reference select the Set Reference submenu in Mount Parameters and follow the ins...

Page 12: ... 2 pv suitable for shooting unguided images with short focal lengths or doing automated photometry sessions The tracking correction can be turned on in the PEC menu of Pulsar2 The rate of correction is 60 sec so there is a need to wait about 60 seconds from the end of a slew before tracking becomes stable A precise Polar Alignment is necessary for unguided imaging I suggest the King method offered...

Page 13: ...things to remember for successful imaging 1 use the correct guide speed for your pixel scale E g Speed 1 2 for high resolution up tp 1 5 pixel speed 3 4 for medium and 5 for telephoto imaging 2 Have stop current set close to track current to avoid jumps in declination 3 Do not let any cables hang off the telescope or camera Route them all via the center of the declination head thru the supplied ca...

Page 14: ...absolute reference as described in this manual optional Program your Parking Homing position p8 of Pulsar2 manual You will use Park Unpark from ascom to shut down the mount and to start your next session Now you can leave the observatory and proceed with your first observing session in remote At the end of the night shut the mount down by Parking it from your ascom program The next night you can s...

Page 15: ...Innovation and service since 1996 www geminitelescope com G53F manual ver 2 7 p15 June 2017 www geminitelescope com ...

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