[time-nuts] STEL-1173/CM Source

Azelio Boriani azelio.boriani at gmail.com
Fri Nov 14 10:56:44 EST 2014

Are you sure you are measuring the 4065A against the Tbolt? TBolt
feeding the start and 4065A feeding the stop and a counter in time
interval mode?

On Fri, Nov 14, 2014 at 3:26 PM, Ed Palmer <ed_palmer at sasktel.net> wrote:
> FYI, I found a source for the PLCC44 version of the STEL-1173 that's used in
> some Datum FTS Cesium standards.  I got mine from here:
> http://www.aliexpress.com/item/Free-shipping-10PCS-STEL-1173-CM-PLCC/2023682701.html
> I left positive feedback, not sure why it doesn't show.
> Shipping was very slow, but the chips appear to be NOS.  There are no
> scratches on the leads which suggests that they were never installed in a
> socket.  I was having trouble with one so I decided to sacrifice it to see
> what was inside it.  The die is labelled 'ORBIT B-100'.  When I chopped out
> the dead chip from my FTS-4065A, the bottom was stamped with the word ORBIT.
> ORBIT Semiconductor works on FPGA to ASIC conversions.  It looks like
> Stanford used Orbit as a fab house.
> I'm currently measuring my 4065A against my Tbolt.  After about 37 hours,
> I'm still not seeing anything that I can attribute to the 4065A. All I'm
> seeing is the Tbolt and the typical response that every GPSDO gives.  I'm
> looking at Total Deviation values of around 1E-13 at 100Kseconds.  Frequency
> offset error appears to be about 6E-13.
> All diagnostic status values are within spec.  I had to adjust the signal
> level from the tube - it was too HIGH!
> I decided to solder in a socket so that I won't have to go through any pain
> if this chip dies in the future - and I now have spares!
> Ed
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