[time-nuts] windows for FFT measurements of phase noise

Bob Camp kb8tq at n1k.org
Fri Jun 10 17:02:47 EDT 2016


If you sit and watch most commercial gear, they go for the “we need more data” approach. 
Put another way, you don’t get 10 Hz data up on the screen in one second. It’s more like  10 to
100 seconds (some gear can be painfully slow).  


> On Jun 10, 2016, at 3:42 PM, jimlux <jimlux at earthlink.net> wrote:
> What sort of windows do folks use for making FFT measurements of phase noise.
> Say you have 1 second of sampled data (so the FFT resolution is 1 Hz). If you're interested in the noise power at, say, 10 Hz away, a rectangular window isn't going to be very far down, unless you have a LOT of points in the FFT.
> Grove's paper from 2004 doesn't mention this detail.
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