Joe
The newer Motorola VP-Oncore receivers are known to be an improved
design over the original Oncores that came with the Z3801A's .
I have recently done some side by side comparison's with two z3801A's
on the same antenna the newer Vp-Oncore's ran SS numbers 15-30 points
higher on the same bird than the older receiver. In all fairness the
older receiver is on its last legs (see last paragraph below)
I also found out that there are two versions of the newer VP-Oncore.
These can be distinguished by the antenna connector, One version has a
right-angle chassis mounted connector like the original 6CH Oncore, the
2nd version has a straight on antenna connector. This 2nd version while
they will work in a Z3801A, have an interference fit problem with a an
IC on the board below when the antenna cable is plugged in and you
can't tighten down all the receiver board mounting screws. I am told
that the straight on version fits the Z3816A with no problem. I have not
verified this since I don't have a Z3816. I have no info on the other
Z38xx models and the fit of the later VP-Oncore
The older 6ch Oncore receivers receivers are beginning to die
apparently. I have had one fail here a few months ago and recently
acquired a 2nd Z3801A that is displaying similar symptoms to the first
failure in that the receiver just stops working after a few hours...over
time the symptom are the receiver drops out for no apparent reason
then revives if the unit is powered off for a while. Over time the time
to receiver drop out gets shorter and shorter after each successive
power cycle, I have one receiver that will now fail within 20 minutes
predictably.
Dave
NR1DX
On 3/16/2016 7:03 AM, Joseph Gray 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, or is
mine defective. BTW, same antenna on a 4-port splitter, same elevation
mask.
Joe Gray
W5JG
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--
Dave
manu...@artekmanuals.com
www.ArtekManuals.com
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