[sdiy] oscillator jitter / phase noise

[Magnus Danielson]

From: Glen <mclilith at charter.net>
Subject: Re: [sdiy] oscillator jitter / phase noise
Date: Thu, 03 Jun 2004 07:25:46 -0400
Message-ID: <4.1.20040603071859.0095a1a0 at mail.charter.net>

Hi Glen,

> At 06:42 AM 6/4/04 , René Schmitz wrote:
> 
> >I would say, that if it isn't recordable with a DAT (or the likes), it 
> >shouldn't be audible on a recording. I think it would be futile to 
> >examine a process that is masked by the common recording methods.
> 
> I think the issue is that it might be somewhat recordable, but it's not
> recorded accurately and precisely enough to make some good
> "laboratory-grade" measurements of it. 

Exactly. Laboratory-grade measurements is my preference when possible.

> Also, just because something might be difficult to measure, certainly
> doesn't mean it doesn't exist, or that it doesn't matter.

Spot on. I think some myths and counter-myths about effects and their
non-measurability can be traceable to the fact that addequate measurement
methods where not in place or spread enought among investigators. Things have
*really* happend in the field of measurements since the dawn of synthesizers.

Also, voltage sampling is a much too over-rated method of measurement. You
can do alot of stuff that way, but there is a number of limits to it and you
need to be very aware of the limits of each and every method of measurements
that one considers to put in use. Fourier analysis is another example of an
over-rated method. Valuable and usefull, yes, but it is not the answers to all
problems.

Cheers,
Magnus - professionally cares about variations in time