I see you are using two for the phase noise test setup (a common way of doing it). I am curious about the phase matching between units. From the results it appears they must be pretty well matched, but did not see any actual data. Since it is over a very narrow frequency BW it should be no problem. Thanks & Regards - Mike
Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -----Original Message----- From: tim...@timeok.it <tim...@timeok.it> Sent: Monday, November 29, 2021 4:35 AM To: time-nuts@lists.febo.com Subject: [time-nuts] Re: Lowest noise (phase noise and ADEV) method to achieve 10 MHz signal from 5 MHz input you can use this: http://www.timeok.it/wp-content/uploads/2015/08/high-performance-frequency-d oublerv1-31.pdf Luciano P. S. Paramithiotti tim...@timeok.it www.timeok.it Da "Matt Huszagh" huszaghm...@gmail.com A time-nuts@lists.febo.com Cc Data Sun, 28 Nov 2021 19:29:58 -0800 Oggetto [time-nuts] Lowest noise (phase noise and ADEV) method to achieve 10 MHz signal from 5 MHz input Hi, I've got a 10 MHz distribution amplifier and am considering purchasing a 5 MHz reference. Most (not all) of my equipment accepts a 5 MHz reference, but I'd like to be able to use the existing distribution amplifier I have if possible. Therefore, I'm considering ways I might generate a low-noise 10 MHz signal from the 5 MHz reference. An obvious way is to use a doubler. However, as I understand it, even an ideal doubler will add 20log(2)=6 dB of phase noise to the 10 MHz signal. It seems like a possibly more expensive, but lower noise way would be to use a PLL with a divider that locks the divided 10 MHz signal to the 5 MHz input. If the time constant of the loop filter is set long enough, does this avoid the phase noise multiplication issue? From what I've gathered, this is a technique HP used in some of their gear. For example, the 8566 and 8340/1 lock a 100 MHz VCXO to an external reference with a PLL. Any other thoughts on this? Matt _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
