[time-nuts] Difference between Oncore models

Joseph Gray jgray at zianet.com
Wed Mar 16 07:03:41 EDT 2016


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

Joe Gray
W5JG


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