[Elecraft] XG3 All-Band RF Signal Source/phase noise performance?

[Alan Bloom]

Someone asked about using the XG3 to measure the skirt attenuation of a
crystal filter.

If the phase noise is -105 dBc / Hz, then with a 500 Hz crystal filter
the filter skirts will disappear into the noise at about -105 + 10 *
log(500) = -78 dB.  With a 2.7 kHz filter, it works out to -71 dB.

Alan N1AL


On Wed, 2011-04-13 at 18:51 -0700, Wayne Burdick wrote:
> Hi John,
> 
> Phase noise is specified in the manual. It is a relatively constant  
> -105 dBc/Hz, even at very close spacings, which is excellent  
> performance for a low-cost, wide-range signal source.
> 
> I wouldn't amplify it to 1KW.
> 
> Let me know how it works for you as a replacement for the HP8640. Not  
> as many knobs and switches, but it runs from a 9-V battery.
> 
> 73,
> Wayne
> N6KR
> 
> 
> On Apr 13, 2011, at 6:46 PM, juergen wrote:
> 
> > Hi
> >
> > No phase noise performance data in the manual. What is the phase  
> > noise performance of the XG3 like?
> >
> > My HP8640 is being held together by a miracles and prayers, I need a  
> > replacement.
> >
> > 73
> > John
> 
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