Maybe: the experiment was made in March... Anyway, as usual, first I commented and then read the article and, yes, I was missing something but it is not so clear IMO. They say to have used 2 Yagi antennas at the receiver side and 1 Yagi and 1 modified parabolic dish at the transmitter. Then by measuring the phase you can separate the two signals. The phase of what is not clear: the carrier? The data? Why phase? The angular momentum translates in a phase rotation? Like adding some delay?
Here another experiment with light: http://www.nature.com/nphoton/journal/v6/n7/full/nphoton.2012.138.html On Tue, Jul 17, 2012 at 9:44 PM, Don Latham <d...@montana.com> wrote: > Are we sure it wasn't the April issue? > Isn't this just phase modulation? > > Azelio Boriani > > To exploit an angular momentum modulation we need a demodulator able to > > recognize that angular momentum... nowadays our demodulators cannot go > > beyond amplitude, phase and their combination. Maybe I'm missing > > something... > > > > On Tue, Jul 17, 2012 at 6:59 PM, Michael Baker <mp...@clanbaker.org> > > wrote: > > > >> Timenutters-- > >> > >> Along the lines of splitting time into small increments, there > >> is an interesting article in the May 2012 issue of the > >> IEEE Spectrum Journal. > >> > >> It describes experiments with what I am calling "cork-screw > >> time-shift phasing modulation" or "orbital time-delayed angular > >> momentum phasing" for lack of a better description of the > >> process. This is not the same as circular-polarization of a > >> radiated signal. > >> > >> Visualize a 4-ft dia parabolic reflector which has been cut > >> (sliced) in a straight line from any arbitrary point on its outer > >> edge to its center. Then, at the outer lip of the reflector > >> surface, pull one side of the cut about a foot forward of the > >> other side of the cut. The separation is greatest at the edge > >> of the dish, gradually becoming less and less as the cut > >> approaches the center of the dish. > >> > >> The concept is that RF energy from the feed progressively > >> strikes different areas of the dish slightly ahead (time-wise) > >> from RF energy that strikes other parts of the dish. Because > >> the surface of the dish resembles a cork-screw the signal > >> from the dish has elements that are time-delayed with > >> respect to other parts. Accordingly, data elements can be > >> incorporated into the signal which have sightly different > >> time-delay angular momentum properties. Again, the folks > >> working on this insist that this is not the same as circular > >> polarity of the radiated signal such as is obtained with a > >> helix antenna. > >> > >> At the receive end, the process is reversed, producing a > >> signal which when demodulated can contain extra levels > >> of data modulation superimposed on it. > >> > >> The article points out that there are skeptics of the process > >> who say that this same modulation procedure can be done > >> with other methods although the modulation and demodulation > >> process would be much more complex. > >> > >> The orbital angular momentum of photons in the optical > >> realm has been extensively studied, although applying these > >> principles to RF is something new. > >> > >> Mike Baker > >> ------------------------------ > >> > >> > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > -- > "Neither the voice of authority nor the weight of reason and argument > are as significant as experiment, for thence comes quiet to the mind." > R. Bacon > "If you don't know what it is, don't poke it." > Ghost in the Shell > > > Dr. Don Latham AJ7LL > Six Mile Systems LLP > 17850 Six Mile Road > POB 134 > Huson, MT, 59846 > VOX 406-626-4304 > www.lightningforensics.com > www.sixmilesystems.com > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.