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> Reflex Klystron
rnabioullin
Posted: March 10, 2011 04:23 am
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How do reflex klystron low-power microwave RF signal generators compare to modern solid state ones in terms of frequency precision and stability?

This post has been edited by rnabioullin on March 10, 2011 04:24 am
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damien
Posted: March 10, 2011 10:21 am
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Did you get a multiple choice option on your homework biggrin.gif

Damien


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CWB
Posted: March 10, 2011 11:19 am
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lesse here ...
tubes versus solid state in general is the first clue/starting point in figuring out the "advantages" .


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Sch3mat1c
Posted: March 10, 2011 04:10 pm
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As compared to what, an LC oscillator? DDS synthesizer? Hydrogen maser? Cesium fountain atomic clock? Should the signal source be: variable frequency, high accuracy, high purity, low drift, etc.?

The nice feature of a reflex klystron is, it's a VCO (voltage controlled oscillator) over a small range, usually defined by the resonant chamber's bandwidth. The inherent stability is probably low (defined by the resonator's Q), but it could easily be mixed with a more accurate source and PLLed to similar stability.

Tim


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tekwiz
Posted: March 10, 2011 09:49 pm
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QUOTE (Sch3mat1c @ March 10, 2011 07:10 am)

The nice feature of a reflex klystron is, it's a VCO (voltage controlled oscillator) over a small range, usually defined by the resonant chamber's bandwidth. The inherent stability is probably low (defined by the resonator's Q), but it could easily be mixed with a more accurate source and PLLed to similar stability.

Tim

And this, of course, is partially dependant on ambient thermal variability.


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rnabioullin
Posted: March 16, 2011 12:15 am
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QUOTE
As compared to what, an LC oscillator? DDS synthesizer? Hydrogen maser? Cesium fountain atomic clock?


DDS synth.
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Sch3mat1c
Posted: March 16, 2011 06:22 pm
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QUOTE (rnabioullin @ March 15, 2011 06:15 pm)
QUOTE
As compared to what, an LC oscillator? DDS synthesizer? Hydrogen maser? Cesium fountain atomic clock?


DDS synth.

Driven by... quartz oscillator, precision timing reference, WWV or GPS? (Which are tied to NIST's atomic clock.)

I would expect a klystron to be comparable to an LC tuned VCO, putting it a couple orders of magnitude below a plain quartz tuned DDS (and a few orders of magnitude further below anything disciplined by the atomic clock, give or take jitter).

Tim


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