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Subject: Re: [M]: OAG, 201XT, and LX-50's
From: Rick & Melissa Keil
Reply To: mapug@shore.net
Date: Tue Feb 03 00:42:24 1998

rlecker@juno.com wrote:

> Once you have calibrated the 201 using the diagonal, its set until you
> change the configuration i.e. straight through the OTA. The OAG is a
> diagonal and the pictor will guide using the pick-off prism. You don't
> need to re-calibrate unless you change the config.

Ric, sorry if I'm repeating myself or just not getting this, but this is
how I've callibrated my 201XT: I had a star diagonal directly connected
to the back of the OTA. The 201 was inserted directly into the diagonal.
Now when I'm manually guiding with just my 9mm ill reticle in this same
configuration, I can hold my hand controller upside down and push the
keypad in the direction I want the star to move, and the star will move
accordingly in both axes. Now the problem as I'm seeing it: when I
manually guide with my Lumicon OAG, using the diagonal ahead of my 9mm
ill reticle in the off axis port, I hold the hand controller upside down
and my movements in RA are the same as I decribed above when guiding
right from the rear of the OTA with the diagonal in place. However my
dec movements are reversed. This is opposite of the movement when I
guide from the back of the OTA with the diagonal in place. If I were to
use these same callibration settings, and the star was to drift down,
the 201 would try to correct for this by sending the star even further
down. Therefore my callibration motions would be different, depending if
I'm guiding through the off axis port of the OAG (dec reversed), or
guiding guiding direcly behind the OTA and star diagonal (dec normal).
Right? :)

So far I just manually guide with the OAG. That seems to fix this whole
mess! :)

Rick Keil
"If you ask a question, you're a fool for the day; Don't ask the
question, and you're a fool forever."-unknown