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phase noise analyzer and phase noise measurement

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wanxiangwan:
phase noise analyzer and phase noise measurement:
https://www.qsl.net/bg6khc/

MegaVolt:
1. DMTD?
2. Noise Allan deviation graph?
3. Price?

jhenderson0107:
I purchased one of these for $780 to supplement existing E4440A spectrum analyzer -based phase noise measurements.  I've only used it for a short while, but it works well.  The developer is helpful and responsive via email. 

The biggest limitation I've encountered thus far is that its analog front-end is bandwidth limited to  < 1 GHz.  Even signals above 200 MHz are significantly attenuated, mitigating performance. 

The device can be used to measure frequency differences (examples provided), but I don't use that feature. 

bozidarms:
Does analyzer have independent input and reference frequencies?

jhenderson0107:
Yes, I've attached a basic block diagram. 

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