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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