John Curl's Blowtorch preamplifier part II

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gerhard said:
Hey, I'm trying the same game with oscillators, also. 16 pcs. 5 MHz SC cut MTI-260
sloooowly phaselocked to one master, and the 16 outputs Wilkinson-combined
to a common coax. That should give pretty low phase noise.
How are you isolating them from each other? Oscillators running at the same frequency don't need much coupling to synchonise them, and so give correlated noise. As you are combining the outputs, and locking to the same master, there is considerable scope for unwanted coupling.
 
I recall seeing a NIST paper on Allen Variance testing that that used multiple series common base stages as isolating/unidirectional buffers

another interesting extreme performance xtal hack is using multiple xtals physically oriented to give multi-axis vibration acceleration error cancellation
 
And of course if the test equipment distortion becomes the limiting factor, then nothing better to do but improve it.

In short, guaranteed employment forever.


Almost forever.... now we can get very close in distortion harmonics at the levels of the lowest noise floors. Employment forever? Why do that?
I tried that once in my life.
Now, i dont have a job.

Leaving for Asia again in 3 days. 🙂 Be out there roaming around for another 3 months. L.G.

THx-RNMarsh
 
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Gravitational waves from black holes detected - BBC News

Gravitational waves detected. Now THAT is precision measurement. No substitute for great Engineering and Physics with the addition of cubic dollars. I shall raise a glass to the Ligo team tonight.

Yeah, but is it audible? 😀

(Doing a nerd's version of a Snoopy Dance over here. This is beyond cool!)

Yes, and they were audible, they sound like a chirp. This will be the next generation of quantum Bybee devices, effectively shielding against gravitational waves.
 
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