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Re: Losmandy DSC strange results

Ray Porter
 

Thanks, Bert. The same procedure is outlined in my manual.

Now let me ask another question, how do you go about shimming a scope using
the Losmandy dovetail system to achieve the results the manual describes?
If you somehow insert shims between the G-11 saddle plate the universal
plate the scope's rings are attached to, won't the process have to be
repeated every time you setup (I don't have the luxury of a permanent
installation)? Should you instead shim between the rings and the scope?
That would seem to create a potential for damaging your OTA.

Thanks,
================================================
Ray Porter
Applications Analyst Programmer
Administrative Information Services, UNC-CH
Phone: 966-5878
email: ray_porter@...
dragon@...
Home Page:

"Meddle not in the affairs of dragons,
for thou art crunchy and taste good with ketchup."

----- Original Message -----
From: "bert katzung" <katzung1@...>
To: <Losmandy_users@...>
Sent: Sunday, September 10, 2000 11:10 PM
Subject: Re: [Losmandy_users] Losmandy DSC strange results



Hi Ray:
I had a similar problem with my G-11 with Losmandy DSC hardware and Sky
Commander electronics (which also has 4000 as the default resolution).
Turns
out that the Losmandy DSCs call for a 4096 step resolution setting, plus
the
"90 degree setting" is *quite* important, for my setup anyway. I found
that
the method described in the SkyCommander instruction book unmasked an
offset
in my dovetail mounting plates. The procedure they recommended, which
worked
for me, was to flip the dec axis horizontal on one side, center Polaris
roughly in a medium power eyepiece with the mount's azimuth knobs, then
flip
to the other side. If Polaris is not very close to center, the mounting
plate under the scope needs adjusting (shimming). After adjusting so that
Polaris is centerable on both sides, put the dec axis vertical and use the
altitude knob to center Polaris up-and-down in the eyepiece. Then get
Polaris dead-center right-to-left in the eyepiece and set, mark, or note
the
DEC mechanical setting circle reading. This will be your "90 degree
setting"
for aligning the computer. (Not sure why it's not the "89.24 degree
setting"
but that's another matter.) I then go on to do a two star setup and my Sky
Commander now gives very good pointing: objects all over the sky are
always
in the eyepiece at x20 and usually at x40.
Hope this helps...
Bert

Bert Katzung
San Rafael, CA
katzung1@...



----- Original Message -----
From: "Ray Porter" <ray_porter@...>
To: "Losmandy Users" <Losmandy_users@...>
Sent: Sunday, 10 September, 2000 3:41 PM
Subject: [Losmandy_users] Losmandy DSC strange results



Greetings all,
I finally got a clear night last night to take the G-11 I'm considering
buying outside for the first time. The dew was terrible (couldn't even
keep
my glasses clear) but I was able to try out the DSC (Losmandy according
to
the labels). I polar aligned using just the polar bore scope then
selected
1-star alignment. I used Vega which by this time was just west of the
meridian so I selected it from the 2nd-star list. I centered Vega in my
reticle then pressed enter. I then tried to target M13. When the DSC
display read zero, instead of M13 I was pointing somewhere about halfway
between Hercules and Ursa Major. I repeated the process using the
2-star
alignment and estimating the +90 degree position and got almost the same
results. Where did I go wrong? I had set the date (which I believe
affects
on planet location). The mount was leveled and it was certainly well
enough
polar aligned for visual observing. I had not reset the encoder
resolution
from the default 4000. The manual mentions 4000 as the default and
gives
the valid range but doesn't recommend a correct value.

Thanks,
****
Ray Porter
lrporter@...
dragon@...
ray_porter@...
Home Page:


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