[time-nuts] Re: ammonia, cesium, masers, etc.

[paul swed]

I was just looking at some of the Kuhne Electronics transverters. Maybe not
so crazy after all.

On Mon, Sep 20, 2021 at 1:52 PM Lux, Jim <jim at luxfamily.com> wrote:

> On 9/20/21 10:21 AM, Andy Talbot wrote:
> > It ought to be possible to find the resonance with off the shelf
> equipment
> > An ADF5355 synthesizer is capable of small frequency steps and will
> > generate up to 13.6GHz.  Use it's 2nd harmonic leakage (4th harm of the
> > VCO), there is a bit coming out at 24GHz.   If the synth  reference input
> > is derived from a 48 bit DDS like an AD9852, it can be tuned in really
> > small frequency steps, far below the 1Hz steps that ought to be enough to
> > spot the absorbtion.   Isn't Caesium about 1Hz wide ?
> >
> > For detection, an amateur 24GHx converter is close enough to use.
> > Copper water pipe that has been hammered into an oval can support TE01
> > modes reliably enough if you need to suppress polarisation rotation.
> >
> > Andy
> > www.g4jnt.com
> >
> One might want to look at the synthesizer, odd harmonics of the output
> might be better, depending on how the synthesis chain works. For
> instance, maybe you want to use an 7-8 Ghz synth and pick the 3rd
> harmonic. or even better, 5th harmonic of 4.76 GHz (which is well below
> the 5 GHz WiFi band, so there's lots of parts)
>
>
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