I got in those Adafruit GPS boards. They are a very nice little GPS. VERY
sensitive. I could get good lock indoors on my (windowless) kitchen floor.
The house is 2 story, stucco with wire mesh in the stucco. I could also get
lock in a restaurant that had a tin roof. We were far from any windows.
The 1PPS signal is normally low and pulses high for 100 milliseconds. The
RS-232 adapter board that I built feeds this into an RS-232 transmitter chip
(MAX3232), so on the interface connector CD will be at +V and pulse down to
-V. Is this what stock NTP likes?
Also, I laid out the adapter board so it an accommodate a Trimble Resolution T
or a Crius CN06 receiver. The Crius receiver uses a U-Blox NEO-6M receiver.
They can be had for around $22 at HobbyKing. They seem to perform even better
than the AdaFruit module. It looks like you will need to bodge a wire onto the
TIMEPULSE pin to use it for 1PPS.
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