PSN-L Email List Message

Subject: Re: GPS serial connection
From: "Larry Cochrane" lcochrane@..............
Date: Tue, 20 Apr 2004 22:33:06 -0700

Hi Richard,

> Hi Larry
> Thank you for the reminder about the 1pps signal. I had forgotten about
> What do you think of driving rs232 and the 1pps a distance of about 70

It should work fine. I've tried 50 feet without any problems.

> There are some tall slender oaks trees which partially lean over the house
> and can partially block satellites at times which is why I want my gps
> mounted near the roof peak, just inside the roof vent. It is easily
> through a stairway in my garage. Also I am in the northern latitude,
> N 42 degrees  14 minutes  11.628 seconds
> W 72 degrees 41 minutes  00.628 seconds

After the receiver is locked, it only takes 2 or more satellites to keep
accurate time. I find that I can place the antenna just about any place
inside my house and still have enough signal for good time keeping. I have a
single story house with a wood roof.

> I have a used receiver and used antenna I bought from you a couple of
> ago. I think the antenna lead is about 10 to 12 feet long. Could I do this
> cat 5 or would you recommend twisted pair? I am looking for suggestions. I
> you must be busy so take your time as I work a lot of overtime so I am not
in a
> rush. Thank you.

You can't extend the antenna with cat 5, you need to use a good quality low
loss 50 ohm coax wire between the antenna and the receive. Cat 5 may work
without some sort of converter for the RS-232 input/outputs. Give it a try
and let us know how it works out.

-Larry Cochrane
Redwood City, PSN


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