[time-nuts] Rare Symmetricom X72 with 1pps input available

Skip Withrow skip.withrow at gmail.com
Tue Jun 14 18:42:37 EDT 2016

Hello time-nuts,

I have available a Symmetricom X72 rubidium oscillator with version 5.08
firmware.  This firmware has the code to discipline the X72 to an external
1pps input.  Unit has been checked out (including 1pps disciplining) and
appears to be in good working condition.  Oscillator comes with one of the
adapter boards just like the non-pps units that we sell on ebay (check out
auction 361567934794), pin-6 is jumpered to provide the 1pps to the X72
(pin 19).  There is also a link to the manual in the ebay auction which has
a lot more on the 1pps disciplining function.

Yes, there are both pros and cons to the X72.  Being very small its
performance won't match an HP5065A.  However, being very small makes it
very portable, it has the GPSDO built in (damping can be set from 0.25 -
4.0, time constant can be set from 0 - 100,000 seconds), and power can be
10-32 volts DC.

Unit is being offered for $225 and includes shipping to the U.S.  First
email to skip at rdrelectronics.com wins, I will send you payment information.

If you miss this one and would like to be put on a waiting list please let
me know, I hope to have more in the future.

Skip Withrow
RDR Electronics, Inc.


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