Hi Based on the phase noise on the 15 MHz output, I would *guess* that the 5 MHz OCXO has a floor in the vicinity of -160 dbc / Hz. That would be correct per the MTI spec sheet. It also would make sense based on your phase noise plots. Close in ( around 200 Hz) your multiplier and amp are doing a better job than the stock 15 MHz tripler and buffer. They have a lot of buffer amps in their 15 MHz chain, so who knows where the issue is in the stock design. Bob > On Jan 17, 2015, at 7:24 AM, Gerhard Hoffmann <dk4xp@arcor.de> wrote: > > Am 03.01.2015 um 02:43 schrieb Gerhard Hoffmann: > >> over the Christmas season, I have designed and built a frequency doubler from 5 to 10 MHz and a distribution amplifier for the Lucent KS-24361. A preliminary writeup is under >> >> < http://www.hoffmann-hochfrequenz.de/downloads/DoubDist.pdf > > > I have updated the text with a phase noise measurement and some clarifications. > > regards, Gerhard > > _______________________________________________ > 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.