[time-nuts] Z3815A front panel status indicator

[Gregory Beat]

This Time-Nuts (archive) thread from January 2010 may be helpful.
Some of this information came from i.fluke (eBay reseller from East Asia)
https://www.febo.com/pipermail/time-nuts/2010-January/043928.html

Originally designed by HP, and made under licence by Chongho in Korea, the Z3815A used the famous (or infamous) HP E1938A oscillator. 
http://www.prc68.com/I/HPE1938.shtml
There were manufacturing problems with this oscillator, and later examples of the Agilent Z3815A like mine were reworked with an add-on board to replace the E1938A with a 5MHz Milliren MTI-260 OCXO. This unit was manufactured about 1998 - 2000 and was used in cellular base stations. It operates from 20 - 50V at about 20W. I use it with software especially written by Con Wassilieff ZL2AFP, although it also operates happily with Satstat, GPSCon.
https://www.febo.com/pipermail/time-nuts/2010-June/047771.html
--M. Greenman, ZL1BPU
http://www.qsl.net/z/zl1bpu/PROJ/Myrefs.htm
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The Z3815A is certainly less common - except down here in VK/ZL.  I have one, and can try to answer your questions. The oscillator used in the Z3815A is generally the HP E1938A, although mine is a more recent Symmetricom version with a Milliren 260 OCXO adaptation. Power supply is 20 - 60V, and the units were built under license by Chongho Industrial in Korea.
No official documentation is available yet for the Z3815A, so all I have was achieved by reverse engineering. The unit is compatible with Satstat and Z38XX. I have no experience of the Z3816A, although I have an HP Z3801A, a Samsung GCRU-D and a Trimble NTGS50AA.
 73, Murray ZL1BPU
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Leap Second Museum :: Photos of Z3815A
http://www.leapsecond.com/museum/z3815a/

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