[time-nuts] Orbital time-delayed angular momentum
Grant Hodgson
grant at ghengineering.co.uk
Fri Jul 20 14:12:31 UTC 2012
If the signal is delayed in time by the dish, then there will be no phase
coherency, and it is the phase coherent properties of a parababoid that make
it the most commonly used type of reflector for microwave signals.
A direct analogy between optical signals propogating in a fiber and RF signals
propogating in free space is not possible - the best analogy would be to
compare light in a fibre with RF in a circular waveguide - which somwehat
limits the applications of orbital angular momentum for RF/microwave systems.
regards
Grant
>
> From: Michael Baker <mpb45 at clanbaker.org>
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Orbital time-delayed angular momentum
> phasing....???!!
> Message-ID: <5008C114.2090600 at clanbaker.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Time-nutters--
>
> Didier Juges asked:
> > What does that do to the focussing properties
> > of the dish?
> ------------------------
>
> I have seen several descriptions of how the dish
> needs to be shaped in order to develop the orbital
> time-delayed angular momentum signal and still
> achieve an integral focus point. I am not sure that
> I can describe it, but as I understand it, the dish
> is not just split and bent into a cork-screw, but that
> the surface of the dish is also continuously shaped so
> as to provide a good focus.... It is just that the
> signal striking parts of the dish which are increasingly
> displaced along the axis of the bore-sight are time
> delayed more or less with respect to other surfaces
> of the dish. The only way I can see for this to work is
> for the dish surface to deviate from a true parabolic
> shape incrementally as each particular area is displaced
> closer or further away from the focal point. It is a
> little hard to visualize and a lot harder to find the
> right words to adequately describe!
>
> Mike Baker
> -----------------------
>
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