PSN-L Email List Message

Subject: Re: GPS serial connection
From: apsn@...........
Date: Tue, 20 Apr 2004 13:08:19 -0800 (AKDT)


Richard,

My GPS antenna, similar to what Larry sells and hooked to a Motorola
Oncore GT+ receiver, can only see the western 1/4 of the sky through
60-foot tall trees.  I routinely get 4+ satellites even during the green
season, rain, snow, etc.  Plus, I have a 7200v power line about 100 feet
from the antenna.  Timing accuracy has never been a problem for me in this
environment.

Just an FYI,

Bob Hammond
Public Seismic Network - Alaska
http://apsn.awcable.com


> Hi Larry
>
> Thank you for the reminder about the 1pps signal. I had forgotten about
> it. What do you think of driving rs232 and the 1pps a distance of about
> 70 feet? There are some tall slender oaks trees which partially lean
> over the house roof and can partially block satellites at times which is
> why I want my gps receiver mounted near the roof peak, just inside the
> roof vent. It is easily accessed through a stairway in my garage. Also I
> am in the northern latitude, actually,  N 42 degrees  14 minutes  11.628
> seconds
> W 72 degrees 41 minutes  00.628 seconds
> I have a used receiver and used antenna I bought from you a couple of
> years ago. I think the antenna lead is about 10 to 12 feet long. Could I
> do this with cat 5 or would you recommend twisted pair? I am looking for
> suggestions. I know you must be busy so take your time as I work a lot
> of overtime so I am not in a rush. Thank you.
>
> 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 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
>>
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Photos: High-quality 4x6 digital prints for 25
> http://photos.yahoo.com/ph/print_splash
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.



__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


[ Top ] [ Back ] [ Home Page ]