[time-nuts] Z3801 Replacement GPS Receiver Card

Mike S mikes at flatsurface.com
Thu Sep 13 20:44:07 UTC 2012


On 9/13/2012 2:00 PM, Chris Albertson wrote:
> On Thu, Sep 13, 2012 at 10:53 AM, Mike S <mikes at flatsurface.com> wrote:
>> Search for "oncore vp" (which is what a z3801a needs), and you won't find
>> ANY, at any price.
>>
> Really?  It can't use the newer UT?  I thought the UT is identical except
> for better performance.

Yes, really. The z3801a starts by sending a @@Ca (self test) command. 
None of the later models have that, so it fails. When they brought the 
self test back with the M12s, it was changed to @@Ia. Then it sends @@Cg 
(go to Position fix mode). They don't have that, either, it was changed 
to @@At on the UT/GT/SL, @@Gd on M12s. There are probably others, but 
that's more than enough to make anything later than a VP fail.



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