Date   

Re: Silex USB Server

Steve... <astropix@...>
 

We finally had a clear night here and I was able to test the Silex SX-2000WG+ in a normal
imaging situation.

Overall it worked but I found that at rapid guiding rates (which I need for my AO), the
guiding display did not keep up. Guiding seemed to be working but I cannot be entirely
sure of that. But the display of the guide star was pretty much frozen from the initial
frame.

It also had a few hiccups at startup and disconnected at one point. This was prior to
starting an imaging run but if it had occurred while I was sleeping and the imager running,
it would have been quite fatal. I ran several hours of tests and it only did this once.

All in all, I've decided to return this unit. I decided that trying to pass real-time control
signals through my LAN was not a good idea. So it's on the way back to Amazon.

I am pretty confident that it could work fine for systems in different configurations. In
general it was easy to set up and configure and if you're guiding with 5 to 10 second guide
exposures, it would probably work fine. So it's worth a go. In any event, it definitely did
interface with my STL camera and transported control to the PC in the house through the
LAN with normal IP protocol over Ethernet.

Steve...


--- In ap-gto@..., "Steve..." <astropix@...> wrote:

I was able to get the Silex SX-2000WG+ to work over a 100' cat 5 cable to my router
and
connect all my software applications to all the equipment. The STL camera and dual
RS232
converter appeared as normal USB devices on the PC, the software connected to them
and
everything worked fine.

There is very little apparent delay from this device, something I was worried about. I
tested guiding using my AO and at 0.1 sec exposures got a 6.67 Hz guiding rate which
is
about as fast as I've seen it run. If you're streaming hi-def video over your LAN, all bets
are off.

I did not try the wireless interface since I primarily want to run this using low cost media
converters for Ethernet over fiber.

It should be possible to put this device in the DMZ of your router and access it from
outside the LAN but I did not test this.

I was not able to get it to work using WinXP / Fusion VM / Leopard (Mac OS X). I'll
continue
to work on that. There is probably a setting in the Mac that needs tweaking somewhere.
But on an old WinXP PC, it was fine.

I should mention that this has not been yet been subjected to an all night imaging
session, this was all daytime tests. So there still could be some more snags awaiting.

Steve...


Re: AP1200-database corruption?

Roland Christen
 

In a message dated 2/16/2009 10:13:21 AM Central Standard Time,
J.Zeglinski@... writes:


Do you see any merit in perhaps doing the initial setup, as you describe
for Park-1, below, but using Park-2 position instead?
No, there is no provison in the keypad for starting from Park2. The reason
Park 1 is used is because it is a reference position which also sets your
latitude.

Rolando


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Re: AP1200-database corruption-resolved

Roland Christen
 

In a message dated 2/15/2009 3:39:00 PM Central Standard Time,
snightingale40@... writes:


Assuming it's fixed, any reason why a series of resets would cause
the mount to get so confused? Maybe science can't explain everything.
See my previous post.

Rolando


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Re: AP1200-database corruption?

Roland Christen
 

In a message dated 2/15/2009 8:51:28 AM Central Standard Time,
snightingale40@... writes:


But so far, it's not totally obvious to me that database corruption
is the problem. But one thing is sure; with AP's support (and the
help from this group) I'll be up and running again at some point! And
in the meantime, my AP1200 has setting circles (even though with
today's electronics, they are no longer needed!) ;>)
Set your keypad to Autostart "NO". Then turn off power. Place the telescope
into Park1 position (pointing to northern horizon). Turn on the power. Go thru
the startup procedure and do a "Start from Park1". Now slew to any object that
is up (Sun, Moon, Planets, or reference stars). Center the object, do a Rcal
and then slew to other objects.

You problem may simply be that you started the telescope on the wrong side of
the meridian, and therefore it tried to go to the objects with the scope
underneath the mount. When in doubt, before doing anything else, ALWAYS do the
above steps to get your mount back into normal operating mode.

Rolando


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easy steps!
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6bcd=febemailfooterNO62)


Astrophysics command center?

chris <lineman_16735@...>
 

Any updates on this project Ray?

Chris


AP1200-database corruption-resolved

snightingale40 <snightingale40@...>
 

I think. Here's what happened:

1. Last night, rapid fire resets/clicks, followed by random slewing,
scope wouldn't go to park position.
2. RA and Decs for M objects checked, and are correct. Looks like
database is OK.
3. Thoroughly cleaned power connector with DeOxit, spread pin,
cleaned pins inside hand controller.
4. Went through original start-up procedure (clock time was off a
little).
5. Manually slewed to sun, and used synch routine for polar aligned
mount.
6. Pressed park and it parked itself as nice as can be.

So it seems like it's fixed, when dark I'll (hopefully) find it's all
good!

Assuming it's fixed, any reason why a series of resets would cause
the mount to get so confused? Maybe science can't explain everything.

BTW, the pin cleaning procedure described by Howard in a previous
post (I don't have the post number) was quite simple. I wonder if the
procedure should be on AP's website, or come with the mounts. Seems
like a simple thing to do every year, or as needed.

Steve


Re: AP1200-database corruption?

Joe Mize
 

Nope Steve, my 01-2007 GTOCP3 doesn't need a new battery. Roland expects batteries to last 10yrs or more, he related a story once where an early CP1 is still chugging along on its original battery.

Make sure you use the correct DB9 Port as detailed in the instructions.

Ahhh, Vista. Howard at A-P should be able to help. I'd bet you're not the only person who has had that problem. Give him a call Monday...joe :)


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "snightingale40" <snightingale40@...>
To: <ap-gto@...>
Sent: Sunday, February 15, 2009 9:51 AM
Subject: [ap-gto] Re: AP1200-database corruption?


Thanks Joe,

I've been called a lot worse than "George". Like when I told my wife
I wanted the new 3600 mount!

Was your problem due to a weak battery?

Interestingly my RA and Dec coordinates displayed by the hand
controller seem to be correct for the couple of M objects I checked;
I'll check again later. Also, I'll take some time today to clean the
contacts as per instructions Howard H gave awhile back.

Downloading the database was easy on my old computer, but with my
newer Vista system I get a message that I'm missing "mscomm32.ocx",
and have had no luck installing it. I haven't yet purchased a USB-
serial converter which I will also need.

But so far, it's not totally obvious to me that database corruption
is the problem. But one thing is sure; with AP's support (and the
help from this group) I'll be up and running again at some point! And
in the meantime, my AP1200 has setting circles (even though with
today's electronics, they are no longer needed!) ;>)

Steve



--- In ap-gto@..., "JoeMize" <jmize@...> wrote:

Ooops! I got mixed up Steve...joe :P


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "JoeMize" <jmize@...>
To: <ap-gto@...>
Sent: Sunday, February 15, 2009 9:06 AM
Subject: Re: [ap-gto] AP1200-database corruption?


Hi George, sorry to hear you're having problems. Last Summer I
had the
same
exact problem happen. A simple download and installation of my
Keypad
fixed
it right away. After all was done I chocked this oddity up to
some bit
getting flipped somehow.

Interestingly, as soon as the database was downloaded I had full
use of my
Keypad even before doing the Rest to wipe and load the old/new
database.
After I did the Reset I was supposed to have lost all my settings
but they
were retained correctly.

Have fun, it was simpler than I remembered. For my old upgraded
GTOCP1 I
had to use a DB9, this time I used a DB9->USB Converter. I guess
A-P made
some changes for CP3...joe :)


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "snightingale40" <snightingale40@...>
To: <ap-gto@...>
Sent: Saturday, February 14, 2009 10:29 PM
Subject: [ap-gto] AP1200-database corruption?


Hi Folks,

I had a database corruption a few years ago (2?), and
successfully
repaired it by replacing keypad battery and downloading new
database
from AP.

Tonight I had problems again, but it seems different. First,
when I
turned on my power supply got a string of "clicks" as if I had a
bad
power connection. Tightened everything up, and it all seemed
good.
Tried a goto to M42 and the mount headed off to a random
direction.
Manually slewed to M42 and "zeroed it"; tried a slew to M1 and
again
it headed off in a random direction. Stopped the slew, punched in
M42, and it went back fine. Tried a slew to Rigel and again no
go.
Tried to park it and again, a random slew.

The coordinates displayed for these objects seem correct, and
I'm not
getting any weird "below horizon" messages, etc.

Any help would be greatly appreciated.

Steve



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Re: AP1200-database corruption?

snightingale40 <snightingale40@...>
 

Thanks Joe,

I've been called a lot worse than "George". Like when I told my wife
I wanted the new 3600 mount!

Was your problem due to a weak battery?

Interestingly my RA and Dec coordinates displayed by the hand
controller seem to be correct for the couple of M objects I checked;
I'll check again later. Also, I'll take some time today to clean the
contacts as per instructions Howard H gave awhile back.

Downloading the database was easy on my old computer, but with my
newer Vista system I get a message that I'm missing "mscomm32.ocx",
and have had no luck installing it. I haven't yet purchased a USB-
serial converter which I will also need.

But so far, it's not totally obvious to me that database corruption
is the problem. But one thing is sure; with AP's support (and the
help from this group) I'll be up and running again at some point! And
in the meantime, my AP1200 has setting circles (even though with
today's electronics, they are no longer needed!) ;>)

Steve



--- In ap-gto@..., "JoeMize" <jmize@...> wrote:

Ooops! I got mixed up Steve...joe :P


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "JoeMize" <jmize@...>
To: <ap-gto@...>
Sent: Sunday, February 15, 2009 9:06 AM
Subject: Re: [ap-gto] AP1200-database corruption?


Hi George, sorry to hear you're having problems. Last Summer I
had the
same
exact problem happen. A simple download and installation of my
Keypad
fixed
it right away. After all was done I chocked this oddity up to
some bit
getting flipped somehow.

Interestingly, as soon as the database was downloaded I had full
use of my
Keypad even before doing the Rest to wipe and load the old/new
database.
After I did the Reset I was supposed to have lost all my settings
but they
were retained correctly.

Have fun, it was simpler than I remembered. For my old upgraded
GTOCP1 I
had to use a DB9, this time I used a DB9->USB Converter. I guess
A-P made
some changes for CP3...joe :)


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "snightingale40" <snightingale40@...>
To: <ap-gto@...>
Sent: Saturday, February 14, 2009 10:29 PM
Subject: [ap-gto] AP1200-database corruption?


Hi Folks,

I had a database corruption a few years ago (2?), and
successfully
repaired it by replacing keypad battery and downloading new
database
from AP.

Tonight I had problems again, but it seems different. First,
when I
turned on my power supply got a string of "clicks" as if I had a
bad
power connection. Tightened everything up, and it all seemed
good.
Tried a goto to M42 and the mount headed off to a random
direction.
Manually slewed to M42 and "zeroed it"; tried a slew to M1 and
again
it headed off in a random direction. Stopped the slew, punched in
M42, and it went back fine. Tried a slew to Rigel and again no
go.
Tried to park it and again, a random slew.

The coordinates displayed for these objects seem correct, and
I'm not
getting any weird "below horizon" messages, etc.

Any help would be greatly appreciated.

Steve



------------------------------------

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see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links






------------------------------------

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Re: AP1200-database corruption?

Joe Mize
 

Ooops! I got mixed up Steve...joe :P


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "JoeMize" <jmize@...>
To: <ap-gto@...>
Sent: Sunday, February 15, 2009 9:06 AM
Subject: Re: [ap-gto] AP1200-database corruption?


Hi George, sorry to hear you're having problems. Last Summer I had the same
exact problem happen. A simple download and installation of my Keypad fixed
it right away. After all was done I chocked this oddity up to some bit
getting flipped somehow.

Interestingly, as soon as the database was downloaded I had full use of my
Keypad even before doing the Rest to wipe and load the old/new database.
After I did the Reset I was supposed to have lost all my settings but they
were retained correctly.

Have fun, it was simpler than I remembered. For my old upgraded GTOCP1 I
had to use a DB9, this time I used a DB9->USB Converter. I guess A-P made
some changes for CP3...joe :)


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "snightingale40" <snightingale40@...>
To: <ap-gto@...>
Sent: Saturday, February 14, 2009 10:29 PM
Subject: [ap-gto] AP1200-database corruption?


Hi Folks,

I had a database corruption a few years ago (2?), and successfully
repaired it by replacing keypad battery and downloading new database
from AP.

Tonight I had problems again, but it seems different. First, when I
turned on my power supply got a string of "clicks" as if I had a bad
power connection. Tightened everything up, and it all seemed good.
Tried a goto to M42 and the mount headed off to a random direction.
Manually slewed to M42 and "zeroed it"; tried a slew to M1 and again
it headed off in a random direction. Stopped the slew, punched in
M42, and it went back fine. Tried a slew to Rigel and again no go.
Tried to park it and again, a random slew.

The coordinates displayed for these objects seem correct, and I'm not
getting any weird "below horizon" messages, etc.

Any help would be greatly appreciated.

Steve



------------------------------------

To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links






------------------------------------

To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links




Re: AP1200-database corruption?

Joe Mize
 

Hi George, sorry to hear you're having problems. Last Summer I had the same exact problem happen. A simple download and installation of my Keypad fixed it right away. After all was done I chocked this oddity up to some bit getting flipped somehow.

Interestingly, as soon as the database was downloaded I had full use of my Keypad even before doing the Rest to wipe and load the old/new database. After I did the Reset I was supposed to have lost all my settings but they were retained correctly.

Have fun, it was simpler than I remembered. For my old upgraded GTOCP1 I had to use a DB9, this time I used a DB9->USB Converter. I guess A-P made some changes for CP3...joe :)


"May You Go Among The Imperishable Stars"
Joe Mize www.cav-sfo.com
Chiefland Astronomy Village, Fla.

----- Original Message -----
From: "snightingale40" <snightingale40@...>
To: <ap-gto@...>
Sent: Saturday, February 14, 2009 10:29 PM
Subject: [ap-gto] AP1200-database corruption?


Hi Folks,

I had a database corruption a few years ago (2?), and successfully
repaired it by replacing keypad battery and downloading new database
from AP.

Tonight I had problems again, but it seems different. First, when I
turned on my power supply got a string of "clicks" as if I had a bad
power connection. Tightened everything up, and it all seemed good.
Tried a goto to M42 and the mount headed off to a random direction.
Manually slewed to M42 and "zeroed it"; tried a slew to M1 and again
it headed off in a random direction. Stopped the slew, punched in
M42, and it went back fine. Tried a slew to Rigel and again no go.
Tried to park it and again, a random slew.

The coordinates displayed for these objects seem correct, and I'm not
getting any weird "below horizon" messages, etc.

Any help would be greatly appreciated.

Steve



------------------------------------

To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links




AP1200-database corruption?

snightingale40 <snightingale40@...>
 

Hi Folks,

I had a database corruption a few years ago (2?), and successfully
repaired it by replacing keypad battery and downloading new database
from AP.

Tonight I had problems again, but it seems different. First, when I
turned on my power supply got a string of "clicks" as if I had a bad
power connection. Tightened everything up, and it all seemed good.
Tried a goto to M42 and the mount headed off to a random direction.
Manually slewed to M42 and "zeroed it"; tried a slew to M1 and again
it headed off in a random direction. Stopped the slew, punched in
M42, and it went back fine. Tried a slew to Rigel and again no go.
Tried to park it and again, a random slew.

The coordinates displayed for these objects seem correct, and I'm not
getting any weird "below horizon" messages, etc.

Any help would be greatly appreciated.

Steve


Re: Keyspan USB Server

rmdesantis <desantis.rm@...>
 

I bought this device just a few weeks ago and returned it. It
certainly does work as advertised - you can use USB devices over a
network, but it still will not support a USB Camera (like SBIG). So
if you want to use it for a remote camera, then this is not the tool.

Mike

--- In ap-gto@..., "wmalkin2000" <wmalkin@...> wrote:

Be careful with this product and USB cameras. Check the fine print!
I
tested this about two years ago and it would not work.

SBIG cameras use isochronous bulk data transfers which were not
supported in the version of the Keyspan device that I have. Maybe
there is a new version that supports this, but I think the idea of
an
Ethernet device and time-sensitive data delivery are fundamentally
incompatible.

Other cameras may work fine.

Wayne

--- In ap-gto@..., "Steve..." <astropix@> wrote:

Is any one using the Keyspan USB server being sold on the
AstroPhysics website (USB1S4P) to
reach a USB based CCD camera? If so, which camera? Any
complaints,
work ok?

Thanks!

Steve...


OT: 2009 Midwest Astro-Imaging Conference

Al - AstroPhoto Insight <Al.Degutis@...>
 

The 3rd Annual Midwest Astro-Imaging Conference (MWAIC), hosted by
AstroPhoto Insight Magazine, will take place on June 26-27, 2009 at
the NIU Educational Center in Hoffman Estates, IL only 20 minutes from
O'Hare International Airport. Speakers include Richard Berry, Michael
Kran, Warren Keller, Craig Stark, Hap Griffin, Chris Peterson, Robert
Reeves, Alan Friedman, plus others.

Registration will open on March 1st with an early bird discount. Visit
http://www.mwaic.com to learn more about the conference and join the
MWAIC Yahoo group (http://groups.yahoo.com/group/mwaic) for
information on the early bird discount.

Clear skies,
Al Degutis
Midwest Astro-Imaging Conference Chair
http://www.mwaic.com


Re: Repost: Mount Rejects Coordinates

jennings0002
 

I've had the same behaviour as well. AP1200, Maximum DL 5, latest
Ascom Driver 4.1.25, through an Aquest Astro Hub or Keyspan USB
converter.



--- In ap-gto@..., "Bob Holzer" <b.holzer@...> wrote:


Hi Roland:

Occasionally during an automated ACP/Maxin run I will get an error
that says the AP mount has rejected the coordinates sent to it by
the
software. Here is an example during a Park, but it could be anytime:

02:14:37 Parking scope.
02:14:39 **Script Error (Tracking has been stopped)**
02:14:39 Source: ASCOM AstroPhysics GTO Driver
02:14:39 Message: AP mount rejected set TargetAltitude = +00*00:00
at
line 1732 column 13.
ACP console log closed 17-Nov-2008 02:14:39 UTC

These have become more frequent as of late, so I'd like to get to
the
bottom of it. It has also been reported by others on the ACP list.

Any thoughts?

Thanks,

Bob


Re: RA/DEC Coordinate System Epoch?

astrokattner
 

Hank,

If you're just doing visual work, you won't see much difference between
JNOW and J2000 as Howard notes. If you're imaging at the higher focal
lengths, then it is better not to mix up JNOW and J2000 if you want to
accurately put a guide star on the chip.

I used to do my initial sync with the keypad (since it was easier to do
near the scope) and then I would slew with the SKY when imaging. This
caused me problems since the original sync was J2000 and subsequent
slews were with JNOW using the SKY. So what I do now is to make sure
the orginal sync is with JNOW if I am going to subsequently run the
scope from the SKY using JNOW.

Ken


Re: How much can the AP 900 handle?

Philip Perkins <ppml3@...>
 

So a 10" f/6 in say a lightweight tube should be no problem? A standard
tube would require much less work on my part over a truss design. 10" F/6
would be ideal for my application, although 12 or 12.5" would be
nice too;-)

If you're doing imaging I would go with a carbon fiber tube. Sure the 900
would handle it with ease.
Confirmed by experience over 8 years using my 12.5" RCOS (carbon fibre tube) on my AP 900 GTO. The 900 GTO is a very strong mount and does indeed handle the big RCOS with ease - not only in rare 'perfect' conditions but in many different conditions over this long period. The only slight struggle these days (with my increasing years) is getting the damn thing on the mount! Once it's on the mount the 900 GTO says: "That's cool - what was all the fuss about" -- and handles it nicely with never a hint of overload. Weather in southern France was abysmal during 2008 (all three trips) so my most recent image with this combo was in 2007:

http://www.astrocruise.com/galaxies/M64_07.htm

The 900 GTO is perfect for my tri-annual expeditions to southern France because it fits very nicely in the Landcruiser whereas the 1200 GTO would not fit, what with the larger portable pier, etc. Here is an (old) picture of the setup - very unusually with an OAG in this case:
http://www.astrocruise.com/articles/intro/rcnew.jpg

Philip
--

Philip Perkins
<ppml3@...>
Wiltshire UK & Luberon France
www.astrocruise.com
--
Note: the above email address may change in future.
To find my latest email address please visit: www.astrocruise.com
and click the "Send Email" link.
--


Re: How much can the AP 900 handle?

chris provost <lineman_16735@...>
 

So a 10" f/6 in say a lightweight tube should be no problem?  A standard tube would require much less work on my part over a truss design.  10" F/6 would be ideal for my application, although 12 or 12.5" would be nice too;-)
 
Chris

--- On Thu, 2/12/09, chris1011@... <chris1011@...> wrote:

From: chris1011@... <chris1011@...>
Subject: Re: [ap-gto] How much can the AP 900 handle?
To: ap-gto@...
Date: Thursday, February 12, 2009, 2:47 PM






In a message dated 2/12/2009 1:21:45 PM Central Standard Time,
lineman_16735@ yahoo.com writes:

I'm thinking of building a Newtonian for imaging with a smallish chip.
I have a last run AP 900. Before I buy a blank and start hogging it
out I thought I would ask for some opinions first. What do you think
would be an acceptable sized newt for the 900? 10" F/5 or F/6? Any
larger? I will be making a truss type OTA to minimize wind effects.
Stability is more important to me than mirror size.

Chris
A 10" F5 or 6 will fit comfortably on a 900 mounting. You could even go
larger if the tube is a lightweight truss. Consider using a conical mirror to save
weight and to make the collimation of the main mirror more robust and
permanent.

Rolando

************ **
Nothing says I love you like flowers! Find a florist
near you now. (http://yellowpages. aol.com/search? query=florist& amp;
ncid=emlcntusyelp00 000002)


Re: Silex USB Server

Joe Zeglinski
 

Steve,

When doing your tests, I wonder if you could find something in XP that reports the number of data errors, or transmission packet retries. That would be an interesting metric between the CAT5 versus wireless connection.

To really fine tune this, you should look at optimizing the packet size in your installed XP. I found that the packet size defaulted during XP install was far too small, designed to make XP at least work, in the worst situations - really dumbed down speed. From my own experience, years ago, I found the following free download optimization program a great performance enhancer, and to just gather statistics :

visit: http://www.dslreports.com/tweaks

Joe

----- Original Message -----
From: "Steve..." <astropix@...>
To: <ap-gto@...>
Sent: Thursday, February 12, 2009 2:20 PM
Subject: [ap-gto] Re: Silex USB Server


I was able to get the Silex SX-2000WG+ to work over a 100' cat 5 cable to my router and
connect all my software applications to all the equipment. The STL camera and dual RS232
converter appeared as normal USB devices on the PC, the software connected to them and
everything worked fine.
snip>
I should mention that this has not been yet been subjected to an all night imaging
session, this was all daytime tests. So there still could be some more snags awaiting.

Steve...



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Re: Silex USB Server

Joe Zeglinski
 

Hi Steve, and group.

I would like to add a recent observation on "CAT5 versus Wireless-N" comms.
Yesterday, I was trying to resolve an internet speed issue in a home - PC upstairs, Sympatico DSL modem downstairs, right below, attached to the phone line. I ran a brand new 50 foot CAT5 cable from the room, down the stairway, to the modem/router. I also had a Linksys-N USB adapter/antenna on top of the PC. Using an internet speed test program (at Toast.net), I averaged 7 runs of a text and photo transmission, first using the CAT5 cable and then, with it unplugged, using Wireless-N.

Imagine my utter surprise that for this old PC setup, the Wireless-N was about 10% faster than CAT-5 copper!
(averaged, 2304 Kb Wireless-N, versus 2134 Kb CAT5, on a 5 Mb ISP connection).
Sort of ruins my faith in hard wired copper connection. Of course, the modem's antenna was only about 15 feet below the room with the PC, and there was some signal loss through one floor and plaster ceiling, but the radio waves also bounced down the open stairway, carrying the copper run.
No excuse for the copper CAT5 being slower, although I wonder if CAT6 cable might have helped.

P.S.
This testing was triggered by BELL Sympatico's Far East tech support "supervisor" siding with his tekky, telling me that 237 Kb (yes, two hundred thirty seven K bits/sec) was acceptable (to him, after he loop back tested my DSL modem), and perfectly normal, in fact better than I should expect, since:
... "sir, you must multiply that figure by 8 to get the true connection speed" !
Suspecting it was all a problem with a flakey phone cable, hung by an amateur electrician over top of the door frame between rooms, I decided to move the modem downstairs to a different phone jack, and run CAT5 from the upstairs PC room. The Wireless-N was supposed to be a backup solution, but ended up as the primary method, faster than CAT5.

I would recommend you do a similar "across the lawn" CAT5 versus Wireless-N test to your observatory, before settling on either choice.
If you do go Wireless-N, I very strongly suggest you (perhaps reluctantly), spend almost twice the cost for something like the Linksys DUAL-Band wireless-N (not their other lower priced Linksys-N home products). The reason is that while the others do use the new N-standard, those products periodically hunt and try to decide if they prefer using the G standard over the N standard received frequency band, as the signal strength varies over time, leading to dropped carrier - not good in the middle of an image download. I know this from experience, in a back yard laptop test. The more expensive Dual Band, doesn't switch, but compares, votes, or averages the data received simultaneously from both band antennas, without carrier dropout. Of course, you must have a matched pair, since there are performance features coded right into their device drivers. I use Linksys as an example - there may be other (matched pair) brands that work this way as well.

As for fibre media, it probably works great - if the cable is not kinked or bent too sharply. Fibre optics cable attenuates signal due to optical polarization change with applied pressure on the fibre, and significantly decreased performance in below freezing. That may only be significant using very long lengths of the high quality single mode fibre optic cable rather than the home plastic multimode variety, and at Gigabit rates rather than typical LAN connection, based on personal experience decades ago.

Sorry for the long winded reply ...
Hope this helps.

Joe

----- Original Message -----
From: "Steve..." <astropix@...>
To: <ap-gto@...>
Sent: Thursday, February 12, 2009 12:45 PM
Subject: [ap-gto] Re: Silex USB Server


Hi Bill,

Thanks for the heads up. I'm using WinXP here and have the firewall turned off entirely.

I was able to get the SX2000WG+ to work with my RS232 converters, no problem at all. It
works fine over a 50' cable however it will not operate over a 100' cat5 cable so I haven't
been able to try it in the observatory with my camera. I haven't tried the wireless interface,
my planned use is with ethernet media converters and fiber, my new observatory will be
about 300' from the house.

I also cannot get it to work under Mac OS X + Fusion + WinXP but I'll get back to that later
once I see it run my STL camera.

Steve...


Re: How much can the AP 900 handle?

Hank Sielski
 

Chris,

I only have a 6" F/7 refractor on mine, but I think folks put 7" F/9
refractors and 12-14" RC's/SCTs and the like on them pretty successfully.
I'd be pretty surprised it it couldn't handle a 12" F/5 or F/6...maybe even
a 14" F/5, depending on the thickness of your blank and how wind resistant
you make your OTA...of course, faster/shorter would be better from that
POV...its not the weight, but the moment arm that counts more here.

Good luck,

Hank

On Thu, Feb 12, 2009 at 11:21 AM, chris <lineman_16735@...> wrote:

I'm thinking of building a Newtonian for imaging with a smallish chip.
I have a last run AP 900. Before I buy a blank and start hogging it
out I thought I would ask for some opinions first. What do you think
would be an acceptable sized newt for the 900? 10" F/5 or F/6? Any
larger? I will be making a truss type OTA to minimize wind effects.
Stability is more important to me than mirror size.

Chris