[opendtv] Re: news: F.C.C. to Open Radio Spectrum

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Wed, 5 Nov 2008 18:43:26 -0500


----- Original Message ----- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>

But then there's the other half of the equation. The DTV receiver.

If you allow WSDs at 40 mW in adjacent channels, or even N+/-2 and N+/-6
which have all proven vulnerable, you need at least 55 dB of
selectivity, worst case. If the FCC was going to play games with the TV
bands, it was incumbent upon them to set minimum standards for DTV
receivers that would allow operating in such environments. A/74 is not
up to the task.

So those rules can't be built into a WSD? Take all of the N+s and the N-s that Doug Lung keeps finding, and if you write the code properly it will figure out which channels are 'legal' and which ones are not. This is part of the regulation the FCC referred to.

And finally there's the disingenuous hype factor. Wireless broadband
schemes have existed for years and years, have gained very little
traction, and have not had to grab assigned TV spectrum. IEEE 802.16,
preferably in the sub-11 GHz bands, has long been available for anyone
wanting to offer broadband to rural customers. Why suddenly is it
mandatory to rape the TV bands to get this service?

I fail to see how a 40 mW anything is going to provide much rural service. And if someone is providing rural internet service, they are pretty much working in a known location, with known licensed users, and will be known to the licensed users in case of interference. They can manually make the choice as to which frequencies to use or to avoid. It's the consumer level take-it-out-of-the-box-and-fire-it-up use that has everyone's panties in a bunch.

John


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