[time-nuts] Best phase detector / mixer for 100MHz?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Nov 27 11:08:22 UTC 2012


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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