[time-nuts] HP Z3805A with 100+ns PPS Jumps
Jim Sanford
wb4gcs at wb4gcs.org
Sun Mar 23 17:33:21 EDT 2014
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
wb4gcs at 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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