[time-nuts] How can I generate a very clean 1 W signal @ 116 MHz ?

[Vlad]

May be using DDS chips ?
Here is interesting work regarding DDS Phase Noise :

http://rubiola.org/pdf-articles/conference/2012-ifcs-DDS.pdf



On 2016-05-30 07:06, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> I was thinking about designing a 2 m (144-146 MHz) ->HF (28-30 MHz)
> transverter, using a 116 MHz local oscillator feeding a level 30 mixer.
> 
> 116 + 28 = 144
> 116 + 30 = 146
> 
> I'm wondering what's the best way to generate 116 MHz with very low 
> phase
> noise. Phase noise at < 20 kHz offset is particularly important, but 
> 200
> kHz would be fairly important. Outside that, it does not matter too 
> much.
> 
> The ability to lock to 10 MHz would be "nice", but certainly not 
> essential,
> as absolute frequency stability would not be of prime importance. 
> Getting
> the phase noise as low as possible would be more important. I expect 
> better
> performance can be achieved if one forgets about locking the signal 
> source
> to something else, but I may be wrong.
> 
> An HP 8663A sig gen has <-147 dBc/Hz at 10 kHz offset, but I'd hope its
> possible to produce something better than is possible in a commercial 
> sig
> gen that covers up to 2.5 GHz.
> 
> Dave
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-- 
WBW,

V.P.