[time-nuts] Need a schematic of Trimble 2003 era Thunderbolt RX

[Said Jackson]

Bob,

Just my 2 cents: If you have a critical environment at work, you should probably not be using a 10 year old $150 product with unknown origin that many here are now reporting as failing on them and that requires multiple power supply rails that can each fail as well.

It will likely make things worse if you start putting wires onto critical traces such as the digital 10MHz going into the low pass filters.

Its fine for hobby applications, but likely not a good idea if you really have a critical environment you need to service. A penny saved but a dollar spent in the long run.

That said I think if I remember correctly there are companies that make mission-critical distribution amps with dual source inputs and auto switching, maybe Quartzlock, Symmetricom, or SRS?

Bye,
Said

Sent From iPhone

On Oct 22, 2013, at 22:15, "Bob Burchett" <Bob.Burchett at EEonTheWeb.com> wrote:

> Anyone have a link or PDF of the T-Bolt schematic? We are "never satisfied"
> with how things that seem to be working fine might fail one day in our
> critical environment SO: 
> 
> 
> 
> The object of the game is so if the T-Bolt fails to provide the 10 MHz
> signal that the loss of it will trigger a fail-over mechanism to a backup
> source so we built up a monitor-keys-a-controller circuit that watches the
> 10 MHz and while we DO have the Trimble PDF manual it doesn't have a
> schematic AND: 
> 
> 
> 
> Issue 1 is: We are monitoring the 10 MHz output of the T-Bolt and it appears
> to be AC coupled so this isn't as easily detected and we want to tap-in
> before the coupling capacitor to get a straight DC coupled signal for our
> special signal monitor circuit; that is one reason for schematic need PLUS: 
> 
> 
> 
> Issue 2 is: We see NO signal coming from the 1 PPS BNC jack and we hear that
> this is a port that can be enabled/ disabled and we are hoping one of you
> know how to enable it to output the 1 PPS which we might use to drive the
> monitor circuit OR: 
> 
> 
> 
> Optionally: how we might rewire it so we can get 10 MHz out of that "unused"
> jack to feed our monitor circuit.
> 
> 
> 
> Thanks!
> 
> 
> 
> Robert L. "Bob" Burchett WB6SLC
> 
> Certified Communications Engineer
> 
> Enterprise Electronics
> 
> 22826 Mariposa Ave. 
> 
> Torrance CA 90502
> 
> Direct line: 310.534.4456
> 
> FAX: 310.534.1233
> 
> Website: www.EEonTheWeb.com
> 
> 
> 
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