[time-nuts] Falling Edge Error

Randy Warner Randy at synergy-gps.com
Mon Aug 14 13:00:35 EDT 2006


Guys,

Maybe it would be better to call it the "leading" edge? I have actually
sent out a couple of our SynPaQ receivers with the 1PPS jumper in the
"inverted" position per customer request. There always have to be a
couple of oddballs.....

Randy 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Normand Martel
Sent: Monday, August 14, 2006 4:40 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Falling Edge Error

If i'm not wrong, virtually ALL GPS modules have their timing
standardized on the RISING edge and do NOT guarantee anything about the
falling edge.

Glenn's measurements confirm that fact... Ideally, to get sure the users
will use the rising edge, that signal shall be a sawtooth!!! (or
simpler: a random falling edge.)

73 de Normand VE2UM
Montreal, Qc. Canada

--- Glenn <glenn at net127.com> wrote:

> 
> I just tried a quick test with my HP 5334A, with a LPRO to TVB divider

> on channel A and an Oncore UT+ on channel B.
> 
> frequency difference:
> measured on the falling edge: 37E-9 Hz measured on the leading edge: 
> 6.7E-9 Hz
> 
> Both measurements are from the rising or falling edge of the 1 PPS of 
> the GPS, 100 sample average.
> 
> cheers,
> glenn
> 
> 
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