[ntp:questions] GPS clock for Linux
unruh-spam at physics.ubc.ca
Fri Sep 12 13:40:00 UTC 2008
"Richard B. Gilbert" <rgilbert88 at comcast.net> writes:
>Terje Mathisen wrote:
>> Richard B. Gilbert wrote:
>>> Hal Murray wrote:
>>>> The Garmin GPS 18 LVC is popular. "Some assembly required."
>>>> (aka soldering) No big deal if somebody has a soldering iron
>>>> handy. There are a couple of links from here:
>>> You will need a 5VDC power supply and a DB-9 or DB-25 connector that
>>> will connect to a serial or parallel port. The serial port DCD line
>>> is frequently used. Also some hookup wire, solder, and perhaps other
>> Using a USB port for the +5V line is the canonical solution: Very cheap,
>> dependable, and no extra wall warts.
>I have read claims here that the high and unpredictable latencies in USB
>render it useless for time keeping!
Yes. That is why you ONLY use it for the 5V. The usb output is +5V, Signal
+, Signal -, Power ground. Ignore the signal lines and just use the +5V and
ground to power your Garmin GPS.
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