Thanks, Hal. Tomorrow, I will take it all outside again and leave it, ...I only left it on the car for 5 minutes or so.
My only other 'GPS' experience is my new Garmin for the car, ...it comes up almost instantly. Maybe I should take it apart! :-) -Don ------------------------------------------------------- -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Friday, January 06, 2012 7:29 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Getting my Rockwell D200 GPS to work dlewis6...@austin.rr.com said: > The antenna is currently on a shelf above my workbench, ....there is a > ceiling and an upstairs above it. Then the roof. > Is it very critical to be outside in order to 'see' the sky? > I did take it out once and set the antenna on my car roof, ....but still no > satellites. How long did you leave it on your car? There are two problems in this area. One is being able to hear the satellites. There may not be enough signal at your workbench. It depends upon how sensitive your receiver is. Most of my newer GPS receivers work in my house. Older ones work less well. The other problem is what frequency to listen to. The satellites broadcast the orbit parameters. That lets a receiver calculate the frequency to listen on. (The Doppler correction is important.) In order to do that, you have to know the time. That's why there is a pin for the backup power to the clock. Without knowing the time, the receiver has to do a brute force search which takes a while. I would put it in the best location you can easily get to and wait a while. It may take 15 minutes or longer. I wouldn't get upset if it takes a half hour. Once you get it working outside, you can take it inside and see if it still works. If you unplug it without the backup battery you will have to start over again. You can also just let it run overnight and see if that works. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.