Re: PPS USB GPS recommendation

[David J Taylor]

List members,
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2. If one were to compare using the NTP servers provided by the NIST vs 
using a PPS via USB GPS device, which would seem the better choice and why?
[]

Thanks in advance to everyone that reads or answers my post.

Very Respectfully,

Stuart Blake Tener, N3GWG (Extra), MROP
Computer Scientist
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Stuart,

Some primary servers (perhaps NIST) are very overloaded, and you would get 
better results using the "pool" directive to allow NTP to use multiple 
servers, many of which may be better performers than an overloaded popular 
server.  You can still have an NIST server in the list.

PPS over USB is likely to be /worse/ than using Internet-based servers, as 
USB is not polled very frequently.  A direct PPS connection is /far/ 
preferable.  Of course, if your only choice it would be better than nothing, 
and would stand alone in the case of Internet loss.

PPS only takes one wire from the GPS direct to the GPIO pin or DCD pin on an 
RS-232 port (possibly via a level converter).

Cheers,
David
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