[time-nuts] Special connector for Symmetricom X72 rubidium standard

Christopher Hoover ch at murgatroid.com
Thu Aug 17 04:11:13 EDT 2017

I'm interested in a piece or two if you do this.   Happy to review
schematics and layout, too.  -- Christopher  AI6KG

On Tue, Aug 15, 2017 at 8:28 AM, Mark Sims <holrum at hotmail.com> wrote:

> Symmetricom sold some interface boards for the X72.   They are 0.32-ish
> inch thick PCB's  with a dual sided edge tab pattern on them.   The PCB
> edge tab will insert into the connector on the X72.  The interface board
> for my X72's only breaks out 12 pins...  a lot of Ebay X72's come with that
> 12 pin connector board...  I think that they were pulls from some piece of
> equipment.   My X72's only had 250 hours on them.
> I have been thinking about laying out an X72 interface board that has the
> edge tab broken out to a standard 26 pin 0.1" pattern,  a RS-232 inteface,
> BNC's for the 10 MHz, ACMOS output,  1PPS in,  1PPS output, etc.  The board
> would also have a way to connect it to the SA22.
> Lady Heather now talks to X72's (and probably X99's and SA22's).   I have
> implemented a disciplining algorithm for use with X72s that have the older
> firmware that does not do disciplining... like probably 99% of the X72's
> out there.  Symmetricom's code only seems to keep the 1PPS aligned with 300
> ns.  My code attempts to keep it within 100 ns.
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