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)
_______________________________________________
time-nuts mailing list -- [email protected] -- To unsubscribe send an
email to [email protected]
To unsubscribe, go to and follow the instructions there.
