I will be eager to see responses to this. It is similar to the behavior
I was seeing on my "tested" nortel unit that I purchased from the
e-place. Tried a bunch of things, new antenna, higher antenna (even
though my Z3801 worked fine on the old, before the Z3801 died) and
different power supplies.
Finally gave up & shut it off. Another time.
Hoping to see some ideas . . . . .
73,
Jim
wb4...@amsat.org
On 3/23/2014 3:45 PM, John Stuart wrote:
I just bought my second HP Z3805 (this one has a 12 ch. receiver) and have
been monitoring it with Ulrich Bangert's Z38XX software tool.
Last week, and again today, the PPS output has had several sudden excursions
of +- 100 ns or more. It appears that each jump is followed by a jump in
the opposite direction a few hours later.
I have inserted the following Z38XX graphs below:
1. Several PPS jumps from last night and early this morning.
2. Similar jumps from last week.
3. Oscilloscope measurement confirming PPS offset. Yellow trace =
ThunderBolt PPS, Blue = HP Z3805A PPS
Might I have a faulty HP Z3805A, or an erratic 10811-60165 DOCXO waking up
from a long nap in China?
John Stuart, KM6QX
Lafayette, CA
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