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 ==== 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 ==== Leap Second Museum :: Photos of Z3815A http://www.leapsecond.com/museum/z3815a/ Sent from iPad Air _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
