Thanks Ed (and Skip),
I've bolted the PCBs back together, and have it connected both via
SatStat and Ulrich's Z38XX. I'll let the oscillator cook for another
week and check the PN and ADEV, and if the E1938 looks good, figure out
the UT+ configuration.
Cheerio.
Hi David,
Skip Withrow and I were able to figure out the connections and the
basic operational features. I've attached a document that describes
our findings.
I wouldn't mind picking up another E1938 oscillator, but I'm reluctant
to buy one that might have mismatched oscillator and circuit board
(i.e. the serial numbers don't match). I've asked a couple of vendors
if the serial numbers matched, but they won't respond. Does anyone
have any experience with a mismatched combination? How's their
performance?
Ed
On 10/27/2013 1:26 PM, David Hooke wrote:
Hi Ed,
My E1938 also came from a very battered STLN4096A from the same
source, and I might also try to get the other boards functional.
Could you share the details of the GPS connections, and which GPS
receiver you used?
Cheers,
david
I recently purchased a Motorola STLN4096A with the HP E1938A
oscillator. I bought it for the oscillator only.
Then I got intrigued by the HP Z3817A GPSDO that's included. I've
reverse engineered most of it and I've got it running. The 1 PPS is
really good ( 1000 measurements, Std. Dev. of <200 ps, min to max
range of <1.5 ns) and the HUP is very slowly dropping (currently at
13 us after ~1.5 days) as the oscillator works out the kinks after
it's long sleep. It's dropping much slower than my Z3801A did when I
first turned it on.
There's one input that I haven't been able to figure out. I've got
data in and 1 PPS in from the GPS receiver. Everything seems to be
working so I'm at a loss what that the other input could be for.
There are no clues to it's function because it appears to go into
one of the Xilinx chips.
Does anyone have any more info on the unit? Has anyone figured out
the other input?
I have searched the net and the archives. There's very little info
or discussion on this unit.
Ed
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