Quote:
Originally Posted by Astromaniac
Hi All,
 I'm building a 16" truss dob, almost finished, and own a used ArgoNavis which came with low resolution encoders. Any idea where to find 32k optical encoders? I've been searching the web but no luck.  Your help is appreciated. 
Cheers,
John |
Hi John,
For quite a while now, all Argo Navis/Obsession telescope combinations
have been shipping with 32K encoders and some Argo Navis/ServoCAT
combinations with 40K encoders.
To purchase a standalone pair, recommend you contact Gary Myers
at StellarCAT
rxdesign@ssvecnet.com or Dave Kriege at Obsession at
telescopes@netwurx.net or purchase a pair from U.S. Digital
https://www.usdigital.com/
Whilst building the scope, any extra effort you put into the following
will pay off in pointing dividends :-
* Making sure the axes are orthogonal. Az to alt should be at right angles
and alt to optical axes should be at right angles.
* Ensuring the altitude bearings and trunnions are circular.
* Ensuring that the altitude encoder is positioned at the
exact alt axis and is mounted "true".
* Ensuring there is a minimum of flex in the trusses.
# Ensuring there are no sources of significant random errors, such
as mirror shift or flex in the focuser when you change eyepieces.
These sources of errors, and others, tend to dominate the pointing
error residuals on most truss Dobs more so than the benefit in going
from say, 10K encoders to 32K encoders.
Argo Navis also has the in-built Telescope Pointing Analysis System
(TPAS) that can analyse and potentially compensate for several of the
more common sources of systematic error. What's more, you can save
a model for re-use on a subsequent observing session.
Be sure to join the Argo Navis User's Group if you have not done so
already for additional tips.
https://groups.yahoo.com/neo/groups/argo_navis_dtc/info
Best Regards
Gary Kopff
Managing Director
Wildcard Innovations Pty. Ltd.
20 Kilmory Place, Mount Kuring-Gai
NSW. 2080. Australia
Phone +61-2-9457-9049
Fax +61-2-9457-9593
sales@wildcard-innovations.com.au
http://www.wildcard-innovations.com.au