Hi Ed,
May I ask where did you get your STLN4096A and what you paid for it? Do
they have any more?
My E1938 recently crapped out. If I put a substitute 10MHz near the first
buffer, the PIC processor comes alive, then I can remove the 10MHz and it
begins to oscillate on it's own. I can quickly recycle power and it still
oscillates. Let it cool down and I need to repeat the "stimulus" procedure.
Anybody have any ideas?
Thanks,
Bob
----- Original Message -----
From: "Ed Palmer" <ed_pal...@sasktel.net>
To: "Time-Nuts" <time-nuts@febo.com>
Sent: Sunday, January 08, 2012 12:20 PM
Subject: [time-nuts] HP Z3817A Reverse Engineering
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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