[time-nuts] Difference between Oncore models

Bob Camp kb8tq at n1k.org
Wed Mar 16 17:10:11 EDT 2016


Hi

> On Mar 16, 2016, at 7:03 AM, Joseph Gray <jgray at zianet.com> wrote:
> 
> I understand that the Oncore GPS in the Lucent units is a newer module
> that tracks eight satellites, vs the older Oncore in the Z3801A that
> only tracks six satellites.
> 
> I decided to do a re-survey with my Z3801A that has been in holdover
> for some time, just as a test. Watching the status screens from both
> GPSDOs, both are seeing the same number of satellites, however, the
> Z3801A is consistently locking to 3-4 fewer than the Lucent.
> 
> This begs the question, is the older Oncore module that deaf,

Yes, the older part is indeed “more deaf” than the newer Oncore modules. The 
“newer” 8 channel modules are deaf compared to a modern module. The “why” 
relates as much to processing horsepower as it does to the actual noise figure 
in this or that component. 

Bob


> or is
> mine defective. BTW, same antenna on a 4-port splitter, same elevation
> mask.
> 
> Joe Gray
> W5JG
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