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Re: Losmandy DSC strange results


bert katzung
 

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@...
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