Standalone receivers don't have to be expensive. Take a look at the GPS
receiver modules at sparkfun.com. They are under $100 (some way under),
and some either require or can take an external antenna, and they
provide 1 PPS output. Garmin themselves sells receiver boards without
integrated antennas.
Now, they are navigation not timing receivers, so the 1 PPS accuracy is
likely only a microsecond or so, not in the nanosecond range. But that's
plenty for NTP. And because they are recent receiver designs, they have
higher sensitivity and faster acquisition than older receivers. Some
support WAAS corrections.
-Dave
On 20/02/2015 10:25, Jim Lux wrote:
And yes, a gps antenna needs a good view of the sky, but the receiver
itself can be 100+ meters away from the antenna
I think you're getting into receivers that are well into the hundreds
of dollars range, if bought new.
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