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[time-freq] Trimble Thunderbolt 1 PPS problem

Alan P. Biddle APBIDDLE at UNITED.NET
Tue Feb 22 14:58:02 UTC 2011


Richard,

That is a very interesting site.  My experiment was with a project that K1JT
is doing, and involved the rf signal generated by the sharp signal being
used in a time of flight propagation study.  Didn't hear anything, which is
why I tried a scope.  When I have a bit of time, I will try the pulse
stretcher, and if that shows it being there, I will try the other experiment
again. 

Thanks for the valuable reference.

73s,

Alan
WA4SCA



-----Original Message-----
From: Sylvain RICHARD [mailto:sr75pro at free.fr] 
Sent: Tuesday, February 22, 2011 8:48 AM
To: APBIDDLE at MAILAPS.ORG; TAPR time and frequency projects
Subject: Re: [time-freq] Trimble Thunderbolt 1 PPS problem

Le 22/02/2011 13:47, Alan P. Biddle a écrit :
> I have a Thunderbolt which I acquired from a Chinese source on eBay to use
> as a 10 MHz standard.  That has been working fine for two years.
Recently,
> I looked at the 1 PPS output for use with an experiment.  According to the
> monitor program, it should be working, and the 1 PPS output is enabled.
> However, the output is either DC high or low, depending on whether it is
set
> to rising or falling trigger, with no transition.  I have looked at it
with
> a 400 MHz Techtronics scope, which certainly should be fast enough to see
> it, and can see the 1 PPS from a Garmin GPS.
>
>
> Alan
> WA4SCA
>
>
Alan,

The 1pps is very sharp. Before you declare the output dead, have a look at
http://www.ko4bb.com/Test_Equipment/Thunderbolt/PulseStretching/

Good luck,

-- 
Sylvain RICHARD






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