Hi Put another way - nobody should directly multiply 10 MHz to 10 GHz with an real expectation of low phase noise when they are done. The design of that multiplier chain is a big part of the equipment design. Cheap out on it and you will have trouble.
The same issues also get into high speed timing circuits. There the cause / effect are not quite as obvious to people. It's a frequency domain / time domain gotcha where the noise makes more sense in the frequency domain. Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: Tuesday, June 05, 2012 6:23 AM To: time-nuts@febo.com Subject: Re: [time-nuts] GPS and Rubidium frequency standards and noisequestion (new... Most Rb's can be improved when it comes to phase noise even a FRK-H, some by replacing the internal oscillators, some by adding an external analog loop. How ever multiplying to 10 GHz and you have to contend with the 60 db deterioration. One way around is higher frequency XTAL or SAW oscillator, but that is an off list discussion. Bert Kehren In a message dated 6/4/2012 11:35:15 P.M. Eastern Daylight Time, t...@skybase.net writes: On 3/06/2012 7:19 PM, Javier Herrero wrote: [snip] > > I don't remember if someone did a comparison in PN performance between > the two FE-5680A flavours. > Hi Javier, I've recently done precisily that. See enclosed graph. As for using RB's and Tbolts for LO locking of mwave synths, a lot of discussion and testing is occurring on our VK logger, specifically at URL.... http://www.vklogger.com/forum/viewtopic.php?f=40&t=10180 and http://www.vklogger.com/forum/viewtopic.php?f=40&t=10229 regards Tim -- VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK :: AMSAT _______________________________________________ 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. _______________________________________________ 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. _______________________________________________ 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.