TAG FOV and other Calculation
Gemini NMEA 0183 GPS info
http://www.psychologie.uni-regensburg.de/Zimmer/trafficresearch/NMEA0183/index.html http://home.mira.net/~gnb/gps/nmea.html#gprmc According to the Gemini manual, pp.85, “Gemini requires only the “Recommended Minimum” (RMC) NMEA 0183 sentence to be sent,” This is: $GPRMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68 225446 Time of fix 22:54:46 UTC A Navigation […]
RE: astrophotography
Hi Jimbo, Ahh, I am sorry, of course that doubleing the f/number is two stops difference! It must be this flue that is consuming my brain cells… 😉 Under one of your […]
star clock (sidereal time)
http://physics.lakeheadu.ca/courses/Astro/2310/sidereal/sidereal.htm
Re: DSC circuit – USB conversion?
Hi Jim, Glad everything’s working. Thanks for the report. BTW, I just finished revamping my digital setting circles web site and linked it to my blog. I posted some information about the […]
Moon at 6 days
First light with Pumpkin. I hardly really count this as a first light — the sun was still up and the scope was on a photo tripod. But, there you go. The […]
RE: DSC circuit – USB conversion?
Hi Jimbo – Nice thorough debugging job. Hard to conclude anything other than the encoder is bad. I’d forgotten that I left the Test menu in my application. That was something I […]
Re: DSCH – encoder resolution and pinout
Hello Jimbo On Sep 24, 2007, at 9:23 AM, Jimbo S. Harris wrote: > Hi Scott, > > When I bought my G-11 mount secondhand, it already had DSCH encoders > installed. […]
Re: DSC circuit – USB conversion?
Jimbo, thanks for the report on the success with the TTL232 modification. I’ll try to include that information on my web site for those who might be interested. On the issue with […]
RECENT UPDATE
Polar Alignment Calculations
Here’s a page that derives Polar Alignment Calculations. (update 5/2020: the original site is gone, so I found the text on Wayback and am inserting it below. This is by the original […]
Gear / Observatory / Telescope
Special Guest Star takes the mount at Hilltop O
The Astro Jedi needed somewhere to store his light sab—- I mean, bucket, and I was only too happy to accommodate him. I have decided that I need to come to a […]
General / Maintenance / Observatory
Dome shutter is motorized again!
I finally decided to bite the bullet and fix the shutter motor. Things went sideways last winter, and I’ve been opening the shutter manually (and tying it shut with rope, so we […]
Trixie 2017 – tube mods
I finally got around to cutting the MTA-UTA tubes to length; the only eyepiece that would come to focus with the focuser spacer in place is the Televue 55mm Plossl. If I […]
MOST COMMENTED
Observatory
Observatory 2.0 – Time has come today!
General / Maintenance
First Light, a deeper look
Mount / Observatory / Telescope
Observatory 2.0 – Result!
Observatory
Observatory 2.0 – The Pier goes in
Gear / General / Maintenance
Martin Farmer Wormblock installation notes
Deep Sky / Long Exposure Photography
NGC2244, The Rosette Nebula
Deep Sky / Long Exposure Photography
Another beautiful night.