[time-nuts] Lucent KS-24361 10 Mhz out success.

Bob Camp kb8tq at n1k.org
Wed Dec 3 19:40:09 EST 2014


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 


> On Dec 3, 2014, at 6:04 PM, paul swed <paulswedb at gmail.com> 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
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