On 1/8/2012 12:19 PM, Azelio Boriani wrote:
OK, I wasn't able to find anything else. Moreover the STLN4096A seems to
have a Rb oscillator now from the usual 'bay vendor... so seems confusing
as the Z3817A may be the E1938A mounted on the PCB that can discipline it
or it is another type of unit or whatever else. No picture found until now
using google.
Yes, I agree that it's odd. It appears that Motorola had the same part
number for both the OCXO-equipped and the Rubidium-equipped oscillators.
Is the Z3817A like the fig.1 picture you can find here:
http://www.prc68.com/I/HPE1938.shtml ?
No, the E1938A oscillator is the entire board shown on that page. The
board is the controller for the oscillator. Without the board, I think
that all you've got is a nice paperweight. A while ago on the auction
site, a vendor was selling just the crystal enclosure (the silver
disk). I wondered if it was even possible to put the enclosure on
another controller or if the controller contained some tuning parameters
that were specific to the enclosure. He sold a few, did any time-nuts
buy them? Anything to report?
I forgot to take pictures when I had the unit apart, but the STLN4096A
consists of the E1938A oscillator, a processor board, and a power supply
board. Here's what the OCXO version looks like from the outside:
http://gzwg.blogspot.com/2009/04/motorola-stln4096a-hight-remote.html
Actually, mine looked quite a bit worse than that one, but that's
another story.
Just for completeness, here's what the Rubidium version looks like:
http://gzwg.blogspot.com/2011/11/motorola-stln4096a-rubidium-oscillator.html
Ed
On Sun, Jan 8, 2012 at 6:57 PM, Ed Palmer<[email protected]> wrote:
Hi Azelio,
Thanks, but I already found that. I've moved quite a bit beyond that.
That message was one of the few in the archives that had any significant
info on this unit. For some reason, I find that surprising.
Ed
On 1/8/2012 11:33 AM, Azelio Boriani wrote:
Have you already this?
On the TIB (P1) DB-25 connector, I'm fairly confident about these:
V+ pins 1 and 21
V- pins 8 and 25
10MHz #1 pins 2/15 xfmr coupled, ~4.6V into 1M
10MHz #2 pins 23/16 xfmr coupled, ~4.6V into 1M
1PPS pin 14
Supply voltage is dictated by Lucent DC-DC converter. Input is 18-36V,
1.9A.
Still chasing down the other pins. Currently I am working on a possible
disciplining input:
input of some kind to U6/3 via 100 ohms pin 18, prob. diff with 4
input of some kind to U6/2 via 100 ohms pin 4, prob. diff with 18
The MMI (J1) DB-9 connector is RS-232, 9600baud, 8n1 and runs a a
familiar SCPI interface.
On Sun, Jan 8, 2012 at 6:20 PM, Ed Palmer<[email protected]> wrote:
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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