[time-nuts] Correcting jitter on the 1 PPS signal from a GPSreceiver.

Peter Reilley peter at reilley.com
Sat Sep 13 18:46:19 EDT 2014

The cables are not exactly the same lengths.   Differences in length
will result in a fixed offset.   I am not concerned about such fixed
errors, only jitter.

I am comparing the rising edges which is what the spec defines as the 
reference edge.


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Chris
Sent: Saturday, September 13, 2014 6:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Correcting jitter on the 1 PPS signal from a

On Sat, Sep 13, 2014 at 1:33 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
> Have they both completed a survey and does the survey make sense?

Are all of the cables the same length?  That includes the cables from
antenna to receiver and the cable carrying the 1PPS from the receiver to
where you are measuring.

And also are you SURE you are measuring the correct end of the pulse, you
want the raising edge.  It is easy to invert the pulse and therefore measure
the falling edge.

Chris Albertson
Redondo Beach, California
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