[time-nuts] locking oscillators - an increase in power and/or stability ?
Dr. David Kirkby (Kirkby Microwave Ltd)
drkirkby at kirkbymicrowave.co.uk
Wed Oct 8 16:42:10 EDT 2014
On 8 Oct 2014 20:18, "paul swed" <paulswedb at gmail.com> wrote:
> David the locking makes sense but the other numbers do not make sense.
> Combined best case would be +3 DBm also you say the current on the diodes
> goes down. More power for less power in is not adding up.
I agree. However, the fact that the current goes down a mA is less than 1%.
With a Gunn diode, it has a negative dynamic resistance. An increase in
voltage causes a drop in current.
> Though the right question is what are they using as power detectors?
I don't know. It is being discussed on ukmicrowaves
A X-band Gunn Oscillator would almost certainly use WR90 waveguide which
has a cutoff frequency of about 6.5 GHz, so one could not get any lower out
> When the 2 are combined there could be a large lower frequency mix
I don't see how it could propagate in waveguide.
> Broad band detectors just collect all of the stuff and add it up.
Does injection locking lead to increased frequency stability? I guess the
effects of small temperature changes at one oscillator, which would
ordinarily cause a change in frequency, might tend to opposed by the
other. Only if they want to move in the same direction they shift more
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