[time-nuts] Effect of EFC noise on phase noise

Bob Camp kb8tq at n1k.org
Mon Aug 1 10:40:52 EDT 2016


It’s just very standard FM modulation math. The only gotcha is the 
(often unknown) bandwidth of the EFC port. Even on a precision 
OCXO, it might be <10 Hz, it might be over a KHz …. The trap many
fall into is the “small angle” restriction. You can get into modulation 
indexes that will get the second and third order terms contributing. 
It’s more common to see on vibration, but it can happen on a noisy


> On Aug 1, 2016, at 9:46 AM, Attila Kinali <attila at kinali.ch> wrote:
> Moin,
> I need some formulas that relate EFC noise to the (added) phase noise of
> an OCXO. It shouldn't be too difficult to come up with something. But
> before I make some stupid mistakes, i wanted to ask whether someone
> has already done this or has any references to papers? My google-foo
> was not strong enough to find something.
> 			Attila Kinali
> -- 
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