Preliminary results of using GPS to look for clock skew

[Jan Ceuleers]

On 09/23/2011 11:38 AM, Dave Taht wrote:
> Thirdly - as much as I would like to get a PPS signal, that seems
> impossible with the hardware we are
> currently playing with. That said, delays/variations of 10ms are not a
> real problem as the bufferbloat signal
> can often be measured in close order of seconds.
>
The cheapest GPS timing receiver, which includes a PPS signal, that I am 
aware of is the Garmin GPS18LVC. It requires soldering to a serial port 
connector, and also needs a +5VDC power source such as can be obtained 
from a USB port, but it is a very capable device.

Note that it needs to be the LVC variant - other variants of the GPS18 
lack the PPS signal.