PSN-L Email List Message

Subject: Re: GPS serial connection
From: apsn apsn@...........
Date: Wed, 21 Apr 2004 07:26:58 -0800


Richard,

You only need 4 satellites for 3-D positioning.  Accurate time can be had=20
by 1-2 satellites if I remember right.

Bob
http://apsn.awcable.com


At 06:17 AM 4/21/2004, you wrote:
>Hi Larry & group
>
>I did not mean cat5 for the antenna, only for rs232 and 1pps.. I guess I=
 was
>not clear on that. The system works fine and thank you for the follow up=20
>on the
>satellite reqirements. I thought I would need at least four sattelites.
>
>Richard
>
>
>
>--- Larry Cochrane  wrote:
> > Richard,
> >
> > My A/D board requires three signal lines to/from the GPS receiver. If=
 you
> > make up a RS232 cable, make sure connect up the 1 pps signal (pin 1) as=
=20
> well
> > as the transmitter, receiver and ground lines.
> >
> > Larry Cochrane
> > Redwood City, PSN
> >
> > ----- Original Message -----
> > From: "Richard Gagnon" 
> > To: 
> > Sent: Monday, April 19, 2004 10:05 AM
> > Subject: GPS serial connection
> >
> >
> > > Since there is power in my attic, I want to install my GPS receiver=
 near
> > the
> > > roof vent at the end of the house and run the cable down to Larry's=
 A/D.
> > The
> > > distance is about 100 feet and I think that is too far for RS232. I=
 have
> > read
> > > where RS485 is useful for this issue. Any suggestions would be
> > appreciated.
> > > Thank you.
> > >
> > > Richard Gagnon
> >
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>
>
>
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