[ntp:questions] Garmin GPS 18LVC Setup but questions on best way

George R.Kasica georgek at netwrx1.com
Tue Dec 30 18:16:47 UTC 2008


On Tue, 30 Dec 2008 17:14:52 GMT, Unruh <unruh-spam at physics.ubc.ca>
wrote:

>"David J Taylor" <david-taylor at blueyonder.neither-this-part.nor-this-bit.co.uk> writes:
>
>>Richard B. Gilbert wrote:
>>[]
>>> I think your best help/advice will come from another GPS18LVC user.
>
>>I described my own simple setup here:
>
>>  http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
>
>>but it's not Linux, and I don't feel competent enough to give "advice". 
>>It seems likely that the wrong edge is being detected, so why not try 
>>reversing the polarity?  I only use the:  127.127.20.1  reference clock, 
>>with GPS configured in the kernel.
>
>
>The other problem is that the the voltage levels might be wrong. A serial
>port is supposed to be -12V to 12V, not the 0-5V that the PPS line on the garmin
>delivers.   Now some serial ports are OK with the 0-5V but that is pretty
>unusual. YOu either need a voltage converter, or you need to use the
>parallel port instead, which takes 0-5V.
What you are proposing is contrary to almost everything I've read
about hooking up this unit.
-- 
George, Ginger/The Beast Kasica(8/1/88-3/19/01, 1/17/02- ), Rosie(9/1/07- ), Merlin/MR. Tibbs(8/1/90-5/24/06, 2/10/08- ), Nazarene(6/1/99-1/28/08)
Jackson, WI USA
georgek at netwrx1.com
http://www.netwrx1.com/georgek
ICQ #12862186

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