So you're saying that these things could, theoretically, be adapted to existing radios?
On Mon, May 22, 2017 at 3:40 PM, Chuck McCown <[email protected]> wrote: > Actually, no processor. It is all in the antenna. If a conventional > antenna is a funnel and you fire vollyballs at it, then the antenna for > this is an auger that you fire vollyballs that are all on a string like a > string of beads and they fly through the air in a cork screw orientation. > > If the pitch of the auger matches the pitch of the string of balls, you > are golden. Otherwise they will bounce off the antenna. > > *From:* Lewis Bergman > *Sent:* Monday, May 22, 2017 2:37 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] OAM > > If my head stops hurting enough, what I get out of your explanation is > that the angle and "direction" from center received by the antenna can > segment the signals. Kind of like staring at a propagation map on a wall. > Since the antenna has to be in the middle where there is a null it can > perceive that 0 degrees, although oriented exactly like 180 degrees, is not > the same signal. > > If so I can't imagine what kind of beefy processor it would take to sort > all that out after the snowplow gets done slicing it up. By the way, if my > attempt to rephrase your description isn't correct, everybody ignore it and > don't try to explain it. I think I feel a brain bleed coming on. > > On Mon, May 22, 2017 at 10:11 AM Cameron Crum <[email protected]> wrote: > >> Oh...in your first post you said "Different numbers of wavelengths can >> be chopped out of the baloney and joined up as a ring." I took that to >> mean different wavelengths, but you meant different multiples of the same >> wavelength? >> >> On Mon, May 22, 2017 at 10:05 AM, Chuck McCown <[email protected]> wrote: >> >>> Same frequency. Different streams of information launched into the >>> ether all on the same frequency. >>> But the streams are oriented in space in a way they do not interfere >>> with each other. >>> >>> *From:* Cameron Crum >>> *Sent:* Monday, May 22, 2017 9:03 AM >>> *To:* [email protected] >>> *Subject:* Re: [AFMUG] OAM >>> >>> How do you have different wavelengths and not different frequencies? Or >>> are you referring to frequency as some channel of a certain bandwidth? >>> >>> On Mon, May 22, 2017 at 9:35 AM, Chuck McCown <[email protected]> wrote: >>> >>>> I finally re-read an IEEE magazine enough times to understand the OAM >>>> propagation. (Orbital angular momentum) >>>> >>>> If you have missed it, for the past 20 years there have been thousands >>>> of white papers written on a type of radio signal called OAM. It looks a >>>> lot like circular polarization but the interesting thing is that you can >>>> use the same frequency for multiple streams that do not interfere. In >>>> theory an infinite number of streams. >>>> >>>> So, here is how I got it explained to myself so that I could understand >>>> it. >>>> Using a special antenna, each wave front is launched like a smoke >>>> ring. And the wave itself , or integer multiples of the wave are like >>>> little snippets of string formed into a ring. That is the smoke ring. As >>>> you traverse it around the ring the phase of the smoke changes. So think >>>> of it as taking a n-lambda foot long chunk of the radio signal. Chop it >>>> out like a long piece of baloney and join it to its self. Then set up some >>>> kind of launcher that can throw these rings of signal at the other end, not >>>> like a frisbee but like a pie in the face. >>>> >>>> Different numbers of wavelengths can be chopped out of the baloney and >>>> joined up as a ring. If you have rings from one transmitter made out of >>>> two wavelengths and rings from a different transmitter of three >>>> wavelengths, they can all use the same frequencies and they will not >>>> interfere with each other. >>>> >>>> The downside is you have to have some really complicated funky antennas >>>> at each end and they have to be aimed up perfectly. The antenna center >>>> must be in the center of the smoke ring to receive it properly. If it is >>>> off to the edge it will not have the clean separation from the other rings >>>> with different integer multiples. >>>> >>>> Should work for very high frequencies over short distances. Like 10 >>>> GHz on up. They are doing it with lasers. I have see the 10 GHz >>>> antennas. They look like the internal parts of a rotary snowplow. >>>> >>> >>> >> >> >
