#Mach2GTO #APCC #Absolute_Encoders #APCC #Absolute_Encoders #Mach2GTO


John Upton
 

Hi Everyone,

   Being new to Astro-Physics mounts and hampered by cloudy skies since getting my Mach2 a couple of weeks ago, I have a bunch of small questions. I'll be asking these over the next few days.

Here is Question #1:
What is the difference between the Mach2 Home and Park-3 positions?

   I have noticed that if I tell APCC to Find home (from the AE Tab) and then query its position (from the GoTo/Recal Tab) it gives me position almost exactly as I expected -- Alt/Az is equal to my Latitude and Azimuth of 0. The mount is not parked after this Find Home operation but tracking is turned off.

   Now, If I Park the mount to Park-3 using the Park Tab of APCC, the mount will slew ever so slightly -- practically invisible to the eye. However after this miniscule slew, if I again query the mount's position as before, I see that the reported position is ever so slightly different from that reported after the Homing. The reported Alt/Az now shows the altitude a little off a tiny amount from my Latitude and the Azimuth is now up to 10 arc-seconds from 0 and seems to vary from one Park to the next.

   What I have read in the manuals, says the Find Home is highly accurate and is set via the encoders at the factory. That is easy to understand. However, why is this not consider to be the same physical position as Park-3?

   It's not like this is terribly important because the difference in positions is tiny but why is there a difference at all?

John

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