[time-nuts] Ashtech Z-12-R Operation?
brooke at pacific.net
Fri May 29 19:28:37 UTC 2009
How can I tell if the external clock is working?
I'm using Thunderbolt -> HP 8648A -> Z-12.
Tom Van Baak wrote:
>> I got an Ashtech Z-12-R that powers up and displays the start up
>> screen, see:
>> But it does not progress or respond to button presses. Does someone
>> have a pdf manual or know how to kick start one of these?
> My Z12-T requires an external 20 MHz reference clock; I'm not
> familiar with your -R model but it too may require this. It's not
> uncommon for high-end geodetic-grade timing receivers to rely
> on an external clock (e.g., cesium or maser). The idea is that
> all received GPS signals are referenced to a real external clock
> instead of an internal or virtual gps clock, or something like that.
> So try that first. The quality of the 20 MHz is not important just
> to see if it starts working. But clearly, to get good results, you'll
> want to lock your 20 MHz to something atomic.
> When I got my Z12 I played a bit with how to get 20 MHz. See:
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