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

paul swed paulswedb at gmail.com
Sat Jan 7 15:49:02 UTC 2012


I was suggesting tricks I used for the austron and odetics. I do not have a
manual on the rockwell. Thats what you would need the command set.
Regards
Paul.

On Sat, Jan 7, 2012 at 1:03 AM, Don Lewis <dlewis6767 at austin.rr.com> wrote:

> Thanks, Paul.
>
> How do you 'tell' them?
>
> -Don
>
>
>
>
>
>
>
> ----------------------------------------
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of paul swed
> Sent: Friday, January 06, 2012 8:56 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Getting my Rockwell D200 GPS to work
>
> 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.
> >
> >
> >
> >
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