[time-nuts] need help with LPF

John Miles jmiles at pop.net
Mon Apr 12 22:05:02 EDT 2010

> Testing this at much less than -120dBc at 1KHz is not easy, since
> I need a
> phase noise analyzer that takes more than 30 seconds to give
> results for a
> measurement. So tapping with a hammer etc won't work.
> But I will try using my 8561E spectrum analyzer, maybe that will pick up
> the tapping noise?! I think we are close to the noise floor of that SA.

Listen to it with an HF receiver on SSB or NBFM mode.  Your Mark 1
Dual-Channel FFT analyzer will do the rest!

-- john, KE5FX

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