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Broadband Over Gas Lines — a Pipe Dream?
prostoalex writes, "USA Today says we might see some progress in broadband over gas pipes, as startup Nethercomm (warning: Flash site) is working on the technology to deliver broadband Internet over this medium using ultrawideband radio. According to the article: 'Broadband in Gas would require installation of an ultrawideband transmitter that's linked to an Internet backbone... at a gas company's network hub. A receiver would be placed at a customer's gas meter. Build-out costs are about $200 per household, Nethercomm says. By contrast, broadband over power lines costs about $600 per household, while phone and cable TV networks each cost well over $1,000 per home to build.'" The article ends on a downbeat note. The upcoming trials that Nethercomm touts are difficult to confirm: "We're intrigued by the technology, but we never got that far in our discussions," says a gas company spokeswoman. And the ultrawideband chip company that had been working with Nethercomm, Freescale Semiconductor, has turned its attention to other projects.
All the newer gas pipes around me come out of the ground as a flexible plastic rather than a metal pipe line. And I live in New Orleans, where we're getting a lot of new gas lines! Is this supposed to be carried by the metal in the pipes or is there going to be some kind of translator in the streets that takes care of it? This is, of course a moot point, since we're supposed to get muni wi-fi, but don't other cities have plastic pipes too?
Suck a lemon?
Sending suitably high frequency EMR through a metal pipe is called a 'waveguide', and its pretty much the standard way to deal with microwave communication. In waveguide the sides do indeed absorb some energy, but with smooth sides and good conductors, the losses are quite small. You need to avoid certain gases, which interact with the microwaves, absorbing the signal. Water is probably the most notable, but with suitable choice of frequencies you can step around most gases (which is why we can send stuff through the air).
All the gas pipes in my city are made of plastic, making this whole idea quite improbable.