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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