Hi Leo.
I dug out my old homebrew 10 MHz xtal oscillator and measured it with the E5052A. One of the design goals for this was to be able to use it as a low noise LO for the E5052A so I could measure phase noise for carrier signals below 10 MHz.. But it was also an exercise to see if it agreed with theory and how low I could get the noise floor.
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The circuit does run the crystal with a very high drive level and I didn't bother trimming it to 10 MHz.?
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I used a basic MMIC gain block as the active device so I think I could improve on the close in noise by several dB if I used a lower noise device. I might revisit this at some point although the performance below is already good enough for my needs with the E5052A.
Regards
Jeremy
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