Hi What you probably will wind up with is a bit wider PLL bandwidth than 50 Hz. The noise floor of your dividers and your phase detector will need to be below that of the BVA. If you divide by 10, then the 20 log N works against you in this case. Take a look at the phase noise numbers on the OCXO at 100 Hz offset to get an idea of just what you are up against.
Next up, the noise of the output VC(X)O will need to be below the multiplied noise of the BVA at the cross over frequency. Here you get a benefit from 20 log N. You still will have a hard time beating the 10 MHz OCXO close in. Phase noise data on both the VC(X)O and the BVA will come in very handy in figuring things out. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Anders Time Sent: Friday, July 01, 2011 7:34 AM To: [email protected] Subject: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz I want go generate a stable 26MHz and 19.2MHz signal with stability in the 1E-13 range at 1s from my 10MHz BVA. Have been thinking about dividing the signals down to 1MHz and 100kHz and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to that signal. But I'm worried that the division will generate noise so it will not be stable enough? Have also been thinking about using a DDS to the 26MHz and 19.2MHz and then pll, but the DDS subject seems to bee very difficult to get a grip on. Is it possible to generate a signal with that kind of stability in the 1s range? Thanks Anders _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
