First off, it’s amazing how many different news reporting services have picked up this article from Reuters and printed it, verbatim, without offering any original thoughts on the subject at all. I’ll try to add a few of my own, because this article excited me with possibilities.
Basically, white space spectrum is simply unused channels in the same frequency range as television. Television, as most people know, is switching completely to digital next year, so there’ll be even more spectrum available once that’s done. The jist of the article is that the FCC is about to free up that white space for use, and this is where it gets interesting. The use for which they’re clearing it is rural broadband and wireless devices, which could pave the way for a whole new generation of mobile techy goodies for gadget junkies like me. By the end of ‘09, we could be seeing HD programming on mobile devices. And not just in urbanized areas.
VHF (Very High Frequency) spectrum has traditionally been used by broadcast television because of its range, which means if you can receive a television signal with an antenna at your home, you’ll probably be able to get broadband at your home once this new tech is implemented. Same antenna (because it’s the same frequency), but hooked up to your wireless router rather than your television. And, if we’re able to make use of this broadband broadcast with mobile handheld devices, you’ll be able to go hiking the Appalachian Trail and watch high definition weather reports on your phone, without having to rely on sat coverage.
Think of your local television station, transmitting around 5 Kw. The tower is probably in the arena of one thousand to two thousand feet tall, which means you might be able to pick up that signal a hundred miles away from the tower if you’re using an external, high-gain antenna (that’s an estimate, I’m not doing proper math here). I’m not even sure if they’re planning on broadcasting broadband in the same way, but that’s kind of what it sounds like the intent is, and that makes me very excited.
Mobile devices with only an internal antenna won’t be able to transmit anywhere near that far, but receiving is a different matter. Which means, of course, that you will be able to read your email while you’re in coverage, but you won’t be able to send email. Just like with a cell phone–a cell tower works in duplex fashion, it receives and transmits. Sometimes engineers have to turn the power down on a site which could be received from a lot farther away because the phones we’re all using now are only half a watt (.6w, actually). So if a cell tower is broadcasting, say, 120w, your half-watt phone might receive the signal twenty miles from the site (depending on terrain, tower height, and numerous other factors). Which means you’ll be able to receive a phone call, but the call will fail if you try to answer it, because your puny half-watt phone can’t transmit strong enough to get the signal back to the tower. So, the engineers cut the transmit power back to 25w, giving the site less coverage, making customers angry who really have no right to be, because they’re the ones who wanted the cute tiny little phone in the first place. But I digress…
In an application like this, there shouldn’t be any cutback in power for the sake of duplex functionality. Just ramp up the power and let me receive what I can. There will be times when I’ll want to transmit but won’t be able to, sure, but with the Internet receiving is the most important thing. With broadcast HD programming, it’s the only thing.
In other words, get ready, because the Internet is about to get a whole lot more crowded.
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