[time-nuts] Getting my Rockwell D200 GPS to work

paul swed paulswedb at gmail.com
Fri Jan 6 21:55:48 EST 2012


Adding to all of the info indeed it does need to have a clear view.
Further say its been off along time and the battery is dead or never
existed it can take hours to acquire the first sat. Especially if date and
time have not been set.
I have recovered older GPS units by actually telling them what PRN to look
so they obtain the tables along with the date and time.
Yours may be far newer then my circa 1994-1998. Just some thoughts.
Regards
Paul
WB8TSL

On Fri, Jan 6, 2012 at 8:40 PM, Don Lewis <dlewis6767 at austin.rr.com> wrote:

> 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-bounces at febo.com [mailto:time-nuts-bounces at 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
>
>
> dlewis6767 at 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 at 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 at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>



More information about the time-nuts mailing list