[time-nuts] Thunderbolt question

Bob kb8tq kb8tq at n1k.org
Fri Aug 4 11:38:20 EDT 2017


> On Aug 4, 2017, at 9:45 AM, paul swed <paulswedb at gmail.com> wrote:
> Arthur
> Thanks for the picture. I have a TBolt also and its working just fine at
> the moment.
> But one day it may not. As several people have mentioned lightnings an
> issue.
> So going down the crazy thought path for a moment.
> It appears from your pix you can figure out what the GPS receiver chip set
> is.
> The thought would be understand the chip set.
> Locate the TX RX and 1pps and plug another receiver in.
> Yes its a kluge and maybe a separate board level GPS receiver can not be
> found...
> But at least an approach.

On the TBolt … much more complex. The device looks at code phase to discipline 
the OCXO. The “guts” of the TBolt need to work closely with the receiver. If you really
want to resurrect a dead one, it’s probably best to trace out the RF section and start 
replacing this and that.  This of course *assumes* it’s not blown someplace like the 
RS-232 end of things … Most of the RF front end bits appear to be fairly generic. With
care, you should be able to swap them out. 


> One other comment. If it is lightning then just maybe its the preamp chip.
> They are typically 3 pin soics and replaceable.
> Regards
> Paul
> On Fri, Aug 4, 2017 at 9:34 AM, Arthur Dent <golgarfrincham at gmail.com>
> wrote:
>> The Thunderbolt is a single board with the GPS receiver in the lower right
>> between the oscillator case and the connectors in the photo in this link.
>> https://www.eevblog.com/forum/testgear/trimble-thunderbolt-
>> gps-disciplined-oscillator/?action=dlattach;attach=102948;image
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