[time-nuts] gpsd 1pps pulse?

Bob Camp lists at rtty.us
Mon May 6 12:29:27 EDT 2013


Unless you have a holdover requirement (running without a GPS antenna for
x,xxx hours), a TBolt is major overkill for NTP. A cheap / simple / low
power GPS receiver with a pps out is plenty good enough. Save the TBolt (and
it's complicated power demands) for a place where you need it. 

Depending on the exact hardware you have in your PC, 10 us may (or may not)
be to narrow. It's easy enough to hook up a TTL to RS-232 chip and try it


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chuck Forsberg WA7KGX N2469R
Sent: Monday, May 06, 2013 9:39 AM
To: time-nuts
Subject: [time-nuts] gpsd 1pps pulse?

I would like to set up a NTP server on a machine running Linux
(currently Korora 18).

What are the requirements for the 1 PPS signal fed to the carrier detect 
I presume the 10 us 1pps from the Thunderbolt is too narrow.
I assume the rising edge of CD is the one gpsd triggers on.

      Chuck Forsberg WA7KGX   caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430

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