From: "centurion40tim" <urgent40@cybertrails.com>
Date: October 6, 2007 4:51:40 PM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: Purchased a new straight thru RJ-12 cable
Rats. May try again tonight if weather eases up. I am using my main 9.25 scope for
guiding while I am learning. Have not made any adjustment to the guide rate. I was mainly
after a simple button test.
On the Celestron yahoo site they are saying that the default autoguide rate is 50% sidereal
which works out to 7.5 arc-seconds per second guide correction - much slower than the
Meade default rate. I assume that's what it is since I haven't changed it. Most folks are
saying that they bump it to 99%. Will try that. I also found a document on that site so I can
recheck the pinout arrangement vis a vis my new cable.
thanks again
--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@...> wrote:
Hi Tim;
On 6-Oct-07, at 1:05 PM, centurion40tim wrote:
from CablesToGo ( I mention the company because it was a good price
- 5 bucks) and set
up for a daytime guiding test. The bad news: I could not perceive
any scope movement
with the directional stickly buttons.
Then it's not working, and I would not bother to do a calibration
unless you can move it with the buttons.
What do you have the Camera attached to, the C9.25 or the 80 mm
guider and what Auto Guide rate have you set the CG5 to? You change
the Auto Guide Rate using the Hand Controller which probably runs
0.25x to say 2x.
If the camera is on the 80 mm which has say a 400 mm focal length,
then each pixel is 2.89 arc seconds in width / height. To see 1 pixel
of motion on screen, the mount must move at least 2.89 arc seconds.
So if the CG5 is set to say 0.25x times movement (which is 3.75 arc
seconds per second of motion at 0 declination ) and your using say a
400 mm focal length Guide Scope, then it will be roughly one second
of time of motion on the Left or Right buttons are down will result
in 1 pixel of motion. If you turn on the Reticule, the center most
dashed circle is 30 pixels in diameter and it will take at least 15
seconds to move an object from center to the edge of the circle in
this case.
The good news: It successfully went through its
calibration and happily began its alignment procedures. Never got
that far before.
I would not be too sure about that. Given that your scope was blowing
all over the place, the alignment process was likely picking up on
the wind not mount movement due to the GPUSB.
Seems
like good news to me. May I conclude that my new cable is good?
I have no idea if it's good or not, but from what it says on the
"CablesToGo" site it sounds okay. The only way to tell is to hook a
volt meter with a power source or conductivity meter up and test each
pin on each cable end to see if they pass current or not.
The other possibility is that the GPUSB is not working properly, and
again you'd need a volt meter to make sure the pins deliver voltage.
I terminated the test
because the wind was blowing my scope all over the place.
The Wind blowing things around is likely what caused the calibration
to complete.
Hope That Helps..
Milton J. Aupperle
President
ASC - Aupperle Services and Contracting
Mac Software (Drivers, Components and Application) Specialist
#1005 - 815 14th Avenue. S.W.
Calgary Alberta T2R0N5
1-(403)-229-9456
milton@...
www.outcastsoft.com
Proud Supporter of the "Party of Alberta"
http://www.partyofalberta.org/