Re: DTV antennas?

On Jul 12, 1:46 pm, Jeff Liebermann <je...@xxxxxxxxxx> wrote:

Jeff,
I've spent a career creating, reviewing, and analyzing RF propagation
maps.
I agree the one you posted (of the amateur station) is pretty hard to
read.

As for the single contour, you can't say with certainty that past the
line there will no reception.
In fact, there will be. And, inside the lines there will also be
places with no coverage.
But 41dBu of signal is sufficient for adequate coverage - absent any
weird stuff.

Also, the dBu requirement changes slightly by frequency. Keep that in
mind.

What you might need is a full study, using the tighest topo data and
calculation grids you can live with - but even that won't give you
indoor reception. For that, you'd need extensive ray-tracing models,
etc..., and frankly by that point, you're more likely to invest in an
outdoor antenna on a pole, or cable / satellite, etc...

For cell sites, remember they are more concerned about adjacent
channel re-use (and interference with CDMA systems, etc..) , not
maximum RF coverage. So generally, cell site plots much more
resolution than broadcast to be of any practical use.

.

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