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

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Wed, 5 Nov 2008 15:20:54 -0500

John Shutt wrote:

> Nulls are not a factor, because WSDs can be mandated to hunt
> the entire 6 MHz wide channel 100 KHz at a time for an RF
> carrier.

That's how these devices work, and they still get fooled. Maybe part of
the problem is that their sensitivity goes way down when close to an
occupied channel. So okay, that spec can be tightened up, since it
applies to devices that are not yet on the market.

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.

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?

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