[time-nuts] How do time-nuts measure phase noise?
iovane at inwind.it
iovane at inwind.it
Mon Aug 17 14:35:06 UTC 2009
In order to simplify the project, and given that I wouldn't need to distinguish
what source the noise comes from, I could use only S1 and X sources. And here is
my last question. If I don't lock the sources to one another (say two HP 10811),
what is the unconvenience? An additional signal in the spectrum, or something else
that I don't figure now?
Thanks and kind regards,
Antonio I8IOV
> Some have commercial phase noise measurement systems like Symmetricoms
> 5115A, 5120A. 5125A.
> Some have older HP phase noise measurement systems like the 3048A etc.
> The rest of us have to build our own systems based around sound cards or
> surplus spectrum analysers together with the necessary mixers, low noise
> amplifiers etc.
>
> Unless your sources are very noisy you wont be able to measure their
> phase noise with just a selective voltmeter or even an RF spectrum analyser.
> If you cant build it, then you need to acquire something like the HP3048
> or the NIST phase noise measurement box currently on ebay.(Item:
> 260423038423)
>
> Bruce
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