Adrian wrote:
Bruce Griffiths schrieb:
Adrian wrote:
Bruce Griffiths schrieb:
Demian Martin wrote:
I asked Wenzel about mixers for phase noise measurement and they
directed me
to Marki Microwave as what they use:
http://www.markimicrowave.com/2770/Mixers.aspx I have not
obtained or
tested any myself but it's a pretty solid recommendation I think.
I got this guy to add cross correlation to his FFT software suite:
http://www.hpw-works.com/ however I have not built hardware to
try it. He
has a 30 day trial and its not expensive for what it is, $300.
There's no evidence of a cross power spectrum function in this suite.
One needs to be able to average at least 10,000 cross power spectra
for some applications.
Bruce
Here is one that does cross spectrum and more: http://www.sigview.com/
A while ago I tried it with a Xonar Essence XT sound card and the
results looked quite promising.
Then I got a 3562A to get to 100 kHz (don't follow me there! These
can be challenging to fix if not impossible. PAL's and other
unobtainable 'field programmables' appear to die faster than
anything else in that boxes. Finally, I needed three of them to get
one working unit...)
Adrian
Tried that as well, how does one get a log y scale on the cross
spectrum plot?
Bruce
With Sigview? I'm sorry my trial version has long expired and even
after installing the latest version it's now requiring a license key...
Adrian
The help file states that the cross power spectrum is the product of the
individual spectra - this is only correct if the individual spectra are
real.
Bruce
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