[opendtv] Re: Broadband DTV interferers

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 28 Jan 2008 15:20:23 -0500

Dale Kelly wrote:

> Much more interesting to me is Charlie Rhodes introduction
> of even another serious source of D/U signal interference in
> the UHF band. The referenced article can be found at the
> following: www.tvtechnology.com\rhodes

I certainly haven't spent the time to try to figure out all possible
triplets in this market. But crowded as it is, I was hoping that
something obvious would jump out.

It did. The triplet is 30, 33, and 36, with IM3 products in 27 and 39.
As it happens all five of those channels are in use here, and they are
all DTT stations.

They are all receivable, at least where we live, even with the indoor
Radio Shack double bowtie. Matter of fact, Ch 27 was receivable with the
indoor antenna before they operated whatever magic they did, to make it
solid with the outdoor antenna too. And the indoor antenna is also
better for Ch 30, which comes in solid, even though it's behind the sort
of reflector-looking gizmo in the Radio Shack antenna.

Had I read this column first, I might have dreaded the appearance of Ch
33 recently, WHUT-DT, which uses Ch 33.

Unless I misunderstand IM3, this is just more ammunition for using
dual-conversion tuners. Because IM3 products wouldn't fall anywhere
close to 27 and 39, with a dual-conversion tuner.

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