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[time-freq] Trimble Thunderbolt 1 PPS problem

Jianhui Luo jianhui.luo at gmail.com
Tue Feb 22 14:39:48 UTC 2011


Hi, Alan:

I have the same exact problems with two units which does not have 1PPS
output.  I try to troubleshooting it but without schematics, I do not
know where to start.

I also bought from Ebay and I am planning to return my two units to the seller.

Regards,

Tim

On Tue, Feb 22, 2011 at 7:47 AM, Alan P. Biddle <APBIDDLE at united.net> wrote:
> 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.
>
> I have tried resetting the unit using the monitor program, but no help.  Is
> there something else to try?  Google has not been my friend on this issue.
> I found the Time-Nuts group again, but got numerous warnings about expired
> and/or invalid security certificates.
>
>
> Alan
> WA4SCA
>
>
>
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