I agree biff44,
but look at the price of the 8566b. more than $3000 even today. Bought for $150 the old 491 is more than enough. And it can go double the high frequency (40GHz) than the 8566b. What you pay is what you get though. The 1 kHz analyzer resolution is probably setting my 3 dB point, which does not probably represent the signal bandwidth at that point, if I get it right....
If you want to look at close in phase noise 'on the cheap' then mix down to AF with a known clean source and look on a PC soundcard with some decent software that can produce a spectrum view.
If you really want to go cheap, you can build a delay line frequency discriminator, and see the output on an oscilloscope. You just need a long low-loss coaxial cable to make one.
" I am susceptible of the method you propose, because the mixer and all the parts in the chain must be of low phase noise too"
You could use a reasonable DDS to generate an ultra low phase noise signal to beat with. Even if the DDS produces spurious terms you can rule these out by simply moving the DDS a few kHz and the spurs will move away.
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