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| Stanford Radio Breakthrough http://www.interceptradio.com/bbs/viewtopic.php?f=6&t=5138 |
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| Author: | nickcarr [ Wed Feb 16, 2011 11:43 am ] |
| Post subject: | Stanford Radio Breakthrough |
http://www.pcpro.co.uk/news/365275/two- ... erformance |
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| Author: | chpalmer [ Wed Feb 16, 2011 7:47 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
Quote: "It's like two people shouting messages to each other at the same time," said Levis. "If both people are shouting at the same time, neither of them will hear the other." sure if each one is speaking at different audio frequencies... We accomplish this now using full duplex (expensive) radios on towers en such... Operating on different frequencies in each direction. Interesting concept... It will be interesting to see how they make it work. |
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| Author: | Sean [ Wed Feb 16, 2011 7:52 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
No different than a 2wire hybrid....in theory. |
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| Author: | Rich [ Wed Feb 16, 2011 8:02 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
True, on the audio side of things. It will have problems scaling with power due to self-desense. TDD seems so much more efficient as a single frequency solution although clock stability/slippage can be a problem in mobile and multipoint environments. |
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| Author: | Sean [ Wed Feb 16, 2011 8:09 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
I'll have to drag out a paper that Bell Labs wrote about using multipath to increase the throughput of a RF carrier. Makes my head hurt. |
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| Author: | Atomic Taco [ Wed Feb 16, 2011 8:20 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
Sean wrote: I'll have to drag out a paper that Bell Labs wrote about using multipath to increase the throughput of a RF carrier. Makes my head hurt. In a similar way to microwave feedlines?
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| Author: | SpudGunMan [ Fri Feb 18, 2011 7:51 am ] |
| Post subject: | Re: Stanford Radio Breakthrough |
Atomic Taco wrote: In a similar way to microwave feedlines? http://en.wikipedia.org/wiki/MIMO in similar ways to Ruckus and new Cisco AP's |
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| Author: | Atomic Taco [ Fri Feb 18, 2011 10:56 am ] |
| Post subject: | Re: Stanford Radio Breakthrough |
No, the hollow feedlines. |
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| Author: | SpudGunMan [ Fri Feb 18, 2011 11:46 am ] |
| Post subject: | Re: Stanford Radio Breakthrough |
Atomic Taco wrote: No, the hollow feedlines. I assume waveguide? that is to keep the guts from falling out of the tube as apposed to the amount of guts you can jam down it. http://en.wikipedia.org/wiki/Waveguide |
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| Author: | Atomic Taco [ Fri Feb 18, 2011 7:21 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
Yeah, waveguide. If you have signals traveling in the - direction over the hollow part, where to the + signals go? |
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| Author: | Jim [ Fri Feb 18, 2011 7:50 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
Works with string theory. Between two cans. :D |
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| Author: | kb7dqh [ Mon Mar 07, 2011 6:10 pm ] |
| Post subject: | Re: Stanford Radio Breakthrough |
What's weird about waveguide is it actually works like a really wide spaced open wire feedline like "twinlead" but is constructed with an infinite number of quarter-wave short circuits on either side. Or coax without a center conductor... One can actually construct a horn antenna which connects directly to a balanced feedline... The REALLY "magic" feedline is "G" line... Look it up... Yup, "coax" without a shield! Anyone need any 5.7Ghz or 10Ghz waveguide??? If so, let me know so I can bring it to Puyallup... Eric KB7DQH |
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