The Alt-AD7 mount from Eckhard Alt finally arrived during the Summer of 2008. It can support and guide up to 100 kg of equipment. It is filled with proven and precise technology, but without any electronic chip inside. The controller and ports are completely kept outside in a separate aluminium/ electronic housing (FS-2 Koch).
Teeth count in RA = 270
Teeth count in DE = 160
Harmonicdrive gears RA/HDUF70BL3 = 1:70 (germany)
Harmonicdrive gears DEK/HDUF100BL3 = 1:100 (germany)
Escape stepper motors = P530 (switzerland)
= 100 full steps/turn (3.6° step angle)
= 200 half steps/U
= 3200 micro steps/U
Old Controller = Dynostar/Parameter:
Trackingfrequenz = ((Teeth) x (gear/ratio) x (half steps))/(starday)
RAslow = 270 x 70 x 200 /86164 = 43.869829627222505918945267164941
DEslow = 160 x 100 x 200 /86164 = 37.13848010770159231233461770577
RAfast = 700 ; 16x
DEfast = 594 ; 16x
Set Gearing RA = 270 x 70 x 100 x 64 = 120960000
Set Gearing DE = 160 x 100 x 100 x 64 = 102400000
Stepsize = 1/32
Acceleration = 2
Corrfactor/Autoguiding = 1.1825
Voltage = 12V
In the observatory installed Controller = FS-2 Astro Elektronik Koch/ Ascom Driver: AdvancedLX200 Telescope
The counterweight consist of several weights of 21kg, 21kg, 15kg, 15kg and a 7kg heavy rod/55cm (Alt-AD7). The overall weight is in balance 79kg
