Hi Be careful when you do this.
A signal with harmonics 20 db down and sub-harmonics 30 db down will make a fine reference input for a counter / signal generator / spectrum analyzer. A signal with a 1 second ADEV of 5x10^-10 will look absolutely perfect on any spectrum analyzer ever made. It will not be a good a reference for an instrument as a source at 5x10^-12. Close in phase noise / ADEV is what you need to set up to check. A relative test is fine ( divide 10 by 2 and compare to 5), but that’s what you need to check Bob > On Dec 3, 2014, at 6:04 PM, paul swed <[email protected]> wrote: > > Have successfully tapped into the clean 10 MHz of the the Lucent and using > a EL2020 50 Mhz current opamp have a very nice 10 Mhz sine wave out. Any > spurs are down at least 43 db. Close in at 4Khz total span or 500 Hz/div I > don't see anything down to at least 65 db. Thats the best detail the HP > 8568B will allow. > > To get the signal out of the Lucent I sliced the 15 Mhz trace and injected > the 10 Mhz into the SMA output connector. > > I am sure there are many other amplifiers and methods that could be used > but this ones working well and can drive some real coax lengths. > > Now the really hard part. Mounting it and the power supply into a rack > panel. > Regards > Paul > WB8TSL > _______________________________________________ > 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.
