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Hi Frank (and All), Thanks for your email. I appreciate your help on scintillation measurements. It will be good to get a handle on scintillation not only...
Hi Frank (and Bruce and All), Thanks for keeping me in the loop. Good discussion of saturation. As soon as I get some data, I'll send to your for analysis...
Hi Russ- Any video format is ok as long as it can be parsed, and as long as it can be recorded at high frame rate. Ideally it would be at higher bit depth...
Hi Mohan, Rebecca, and Paul, Good first night's run on the 20 inch at Leeward Community College. Mainly the normal start up things. We got my SBIG ST402...
Dr. Robert E. Williams Distinguished Research Scholar Space Telescope Science Institute President, International Astronomical Union Dear Bob, Sorry I missed...
Hi BJ and All, Very good! We'll have a go at it, perhaps as early as tonight. Tom Smith just sent me the 6th Orbit catalog on a spreadsheet with data from ...
Hi David, Congratulations! A successful 60-inch slump. Very good! An excellent first step in a long but doable road. I’ll let the folks at Glass Tops...
Hi Donny and Dave (and Bruce, John, David, Mounir, Laura, and Mike), Good discussions at the conference on active primary mirrors in general and for the 1.5...
Hi Russ It would be a little trickier to construct - but if you glued the pulley to a nut and the magnet to the end of a threaded rod, you could get the rod to...
Hi Wayne, That sounds like a good idea--similar to a linear stepper motor. I suppose if they were not too expensive, just going with a linear stepper might...
Because of the heat generated by holding current, I generally try to avoid using stepper motors near telescope optics. Even when stationary, stepper motors...
... I2C is a terrible protocol over more than an on-board interface. Like SPI it is essentially single ended. CAN would be the best way to go, since fault and...
FWIW, I have used I2C over distances up to 10 meters without problems. It depends on the application. Meade's LXD/ETX/DS/LX GOTO scopes all use a modified I2C...
On 5 February 2012 20:40, Christopher Erickson < ... I'm sorry, I disagree fundamentally that RS232 is a good choice in a modern system - yes serial, sure, but...
RS-232 and serial are exactly the same thing. They both refer to a defacto-standard of communications that has a lot of history and a lot of iterations. One...
I'm not inclined to use RS-232/488/485 any more as support is waning. For portable applications where a lap top is used, you are force to use an additional...
The perspective of the developer and the manufacturer is often considerably different from that of the end-user. From a developer's point of view, USB is the...
On 5 February 2012 21:45, Christopher Erickson < ... Oh dear, so much wrongness. So, by your argument Rs232= RS485 = RS422 = ethernet, because they're all ...
On 5 February 2012 23:38, Christopher Erickson < ... I think you are missing the MUCH simpler design path of modern USB development. Take a look at the latest...
Hi all I'm with Christopher on this one. As an electronics design engineer with over 30 years experience, and having designed embedded systems for a multitude...
... mirror, I have to take issue with the continuing wailing and gnashing of teeth about USB development. ITS EASY NOW. Sure, it used to be hard, but because...
Hi Steve Each of us can only go on our own experiences. You have yours, and I have mine. If you have had a good experience with USB, then I can't argue with...
Hi all, Wayne, I agree that most need a dongle, and agree with the partitioning if I2C etc. I've done a little with the TI and PIC line and looked at a few...
how much range do you need ? I played with the servo motors used for model airplanes etc... they are really easy to interface when you need may channels + USB...
Hi David, Good on the successful move out of the kiln, but sorry it's too heavy for the grinding machine. Larger motors or entire new machine or ... ? Yes, ...
Russ, Dave, Ritchie Observatory on Bainbridge Island has a large machine but it may only go to 1m http://www.bpastro.org/index.php?page=edwin-ritchie-telescope...
Scheduled Maintenance:
We are undertaking some essential, but extensive maintenance to improve Yahoo!
Calendar. Your Group Calendar is being migrated to a much improved version of
Yahoo! Calendar. During the maintenance period, you may not have access to your
Groups Calendar.
We sincerely apologize for this inconvenience. Your Groups Calendar is in great
shape and we are working to have it available again as quickly as possible
- Yahoo! Groups & Yahoo! Calendar Team
