[ntp:hackers] Output disciplined PPS from RS-232?

Greg Dowd GDowd at symmetricom.com
Thu Sep 27 18:52:18 UTC 2007


My guess was that he wanted to see the disciplined clock output.   


Greg Dowd
gdowd at symmetricom dot com (antispam format)
Symmetricom, Inc. 
www.symmetricom.com
"The current implementation is non-obvious and may need to be improved."




-----Original Message-----
From: hackers-bounces+gdowd=symmetricom.com at lists.ntp.org
[mailto:hackers-bounces+gdowd=symmetricom.com at lists.ntp.org] On Behalf
Of Hal Murray
Sent: Thursday, September 27, 2007 11:48 AM
To: Fernando P. Hauscarriaga
Cc: NTP Hackers Mailing List
Subject: Re: [ntp:hackers] Output disciplined PPS from RS-232?


> May be some of you have more experience on PPS than me (almost none), 
> I would like to know if is it possible to output a PPS from a 
> disciplined (pps-kit) stratum 1 server on the RS-232 interface, the 
> scenario is this:

> a ntp server (stratum 1) with a gps reference clock, and a pps input 
> from the same gps disciplining the clock via pps-kit patch...

What are you trying to do?

Your description seems silly, so I probably don't understand something.
It looks like you want to take a good PPS signal, feed it into a PC, and
get
(roughly) the same signal out.  I'd expect that PC to add lots of jitter
so the output will be lower quality than the input.

There are several boxes available that contain a GPS receiver, a good
OSC, and a pile of software and some dedicated hardware.  Google for
Z3801A.  It's being retired from cell phone towers.  They are popular
with hams so there is a lot of info available.



--
These are my opinions, not necessarily my employer's.  I hate spam.



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