Hi Put another way:
If you set up / sync up a time source based on a cheap 1 ppm TCXO, you are good for more than 10,000 seconds after the sync. If your viewing period is in the 2 to 4 hour range, it should work out pretty well. Bob On Nov 26, 2010, at 7:58 PM, Brooke Clarke wrote: > Hi Bill: > > The telescope has around arc second pointing capability so I think he needs a > hundredth of a second or slightly better. > > What's now done is to manually bring the scope onto a half dozen known stars > (called a short run) which sets time in the tracking software. But if the > tracking computer had much better time the short run would no be needed. > > I've found some NMEA software that will set a PC clock, but it expects the > data on a COM port. Don't know how it might work with USB data. > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > > > Bill Hawkins wrote: >> Brooke, >> >> Google says the SD-200 speaks 4800 baud NMEA at 1 second intervals. >> >> It is not clear whether the message is fixed of if it will reply >> to queries. >> >> Your question only concerned cost. Is one second accuracy adequate? >> >> Bill Hawkins >> >> >> -----Original Message----- >> From: [email protected] >> Sent: Friday, November 26, 2010 3:43 PM >> To: [email protected] >> Subject: [time-nuts] USB Low Cost GPS Timing Receiver >> >> Hi: >> >> A friend is looking for a low cost GPS receiver to set the clock in the >> computer that controls his telescope mount. USB would be nice but is not >> a requirement. >> >> For example does eBay item 130456356506 set the computer clock? >> >> This GPS receiver for the Nikon has a mini-USB connector, but when >> connected to my computer is not recognized. >> http://www.prc68.com/I/Nikon.shtml#GPS >> >> Have Fun, >> >> Brooke Clarke >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
