[time-nuts] Keysight N5511A - phase noise measurements down to theoretical-177 dBm/Hz

[Bruce Griffiths]

That should have been:

Its only necessary (as NIST have shown) to cool the splitters to reduce the correlated or anti-correlated thermal noise between splitter outputs. Everything else can run at ambient temperature. 

Bruce

> On 21 August 2019 at 21:13 Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> 
> Its only necessary (as NIST have shown) to cool the splitters to reduce the correlated or anti-correlated noise between the outputs. Everything else can run at ambient temperature. 
> 
> Bruce
> > On 21 August 2019 at 18:49 ed breya <eb at telight.com> wrote:
> > 
> > 
> > That's quite an impressive system. I guess it's a few generations beyond 
> > my 11729C.
> > 
> > One way to get overall performance to the limits of room temperature kT 
> > noise level, is to lower the T where you work. I wouldn't be surprised 
> > if some parts are TE-cooled, easily affordable in a big budget system. 
> > My first thought was maybe a bunch of stuff in a cryogenic system, but 
> > it looks like most pieces are modules in a rack mainframe, and not in a 
> > special environment. But, within the modules, I could picture some 
> > degree (PTP) of TE-cooling being included, giving some margin on the 
> > capabilities.
> > 
> > Ed
> > 
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