Meade SN-10 AT Manual de instrucciones descargar pdf (Pagina 11)

(overhead advances two RA hours every month, for the

same day number and time...approximately).

WHAT IS T HE MAXIMUM V OLTAGE T O BE USED AS A POWER SUPPLY:

Meade has never (that Ive seen) published a maximum

rating. The 4504 (similar motor units, same Autostar) has

15v on its power jack, and uses a 10-C-cell pack. The origi-

nal Meade adapters for the ETX90 and LX90 both are un-

regulated, and put out about 15.8 v unloaded... and they

have sufficient rating (an amp over measured demands)

that i doubt that they drop below 13v in operation.

Looking at the components inside the scopes, and histori-

cally, Clay and I and other have kind of agreed that 16v is

the upper limit.. Exceeding that is venturing into less-

charted territory. There -have- been reports of damage with

18v supplies (old LX200 supplies)... but those were prob-

ably unregulated, too, and really putting out above 20v.

The lowest-rated component Ive seen were 25v capacitors.

The Autostar (and the various subcomponent circuit cards)

all have on-board regulators... but if youre running higher

voltages, then those regulators have to dump more energy

as heat. The motors themselves may actually receive un-

regulated power (higher voltages makes them move faster

at full speed).

So: my recommendation is: dont exceed 16v. 15.8 is fine.

14 is fine, 12 is fine. 10 works...slowly. The area to the

immediate left of your Autostar display may get hot in

warm weather with high voltage operation... thats where

the heat-dumping regulator is. See photos at:

http://www.weasner.com/etx/autostar/ as_schematic.html

If you see the display pixels on that side staying on, the

display may be getting a bit too warm. Unregulated sup-

plies are perhaps -nice-, in that they -will- lower their out-

put if something goes strange with the telescope. A fully

regulated, powerful supply would continue to feed full

power... as can a 17ah battery (i -use- a 17ah battery on

my LX200, but its fused for 2.5 amps) (ah is ampere-

hour).

Jason mentioned the Battery Level readout in the Autostar

(its one of the displays you can scroll to if you lean on

[mode] for three seconds and release). Ive only done the

rigorous testing of its levels to voltages once, and have since

lost the scrap of paper. But roughly it reads 100% to 11v,

and 68% at 7 volts. My ETX90 goes weird at 6.8 volts.

Ive heard of other folks successfully operating down to

50%.

LINK TO CITY’S MAGNETIC VARIATION:

http://www.ngdc.noaa.gov/cgi-bin/seg/gmag/fldsnth1.pl

You can either fill in your specific latitude and longitude,

or, if you dont know the coordinates, you can type in your

zip code. The site will then fill in all the fields for you,

including your elevation. So, this site is also great for get-

ting a quick LAT and LONG for any city.

WHAT’S A MUF?: Motor Unit Failure is a message the

Autostar will display if it thinks the motors are not oper-

ating properly... accompanied with a long list of possible

causes (it just knows theyre not moving like they should).

The list includes: low batteries, and something holding the

scope from moving. Other (not listed) causes can included

dirty encoders. However: After verifying that something -

isnt- caught between the moving parts (such as the barrel

hitting the tripod), performing a Setup > Telescope > Cali-

brate [enter] will overcome MUFs caused by changing

power supplies (from, say, 10v batteries to a 15v wall

adapter), or, for that matter, can prevent slightly-low bat-

teries from messing up the session -quite- yet. Performing

a Calibrate will mess up your current alignment.

Courtesy of: Dick Seymour

More Information...

You may find these sites to be helpful in the pursuit of your

Amateur Astronomy hobby:

Arkansas Sky Observatory

http://www.arksky.org/

Drift Alignment Method

http://www.darkskyimages.com/gpolar.html

Harvard Education Ephemerides and Orbital Elements

http://cfa-www.harvard.edu/iau/Ephemerides/

Jason’s BackYard Astronomy

http://www.geocities.com/jascarden/

lxd55addendum.htm

Latitude / Longitude Format Converter

http://www.geology.enr.state.nc.us/gis/latlon.html

Meade AutoStar Update Page

http://www.meade.com/support/auto.html

Messier Catalog

http://www.seds.org/messier/

Mike Weasner’s ETX Site

http://www.weasner.com/etx/menu.html

Mike Weasner’s LXD Site

http://www.weasner.com/lxd/

Polar Alignment Procedures

http://www.starizona.com/basics/polarg3.html

Yahoo LXD55 Telescope Site

http://groups.yahoo.com/group/LXD55telescopes/

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