Re: BAd News!

On Thu, 03 Nov 2005 19:33:46 GMT Bob Miller <robmx@xxxxxxxxxxxxx> wrote:

| I don't know of any coverage area of any full power station that extends
| out 125 miles. At that distance it is most likely interfering with the
| reuse of that spectrum by another co-channel. This is not a feature but
| one of the major problems with full overpowered TV broadcasting. It is
| not the way to design a modern broadcast network. The fact that stations
| can be received at those distances over the radio horizon is a negative.

Where I lived in my teenage days, I got clear pictures on TWO different
channel 4 stations with a directional outdoor antenna, each at about 100
miles away. One was in Columbus OH and the other in Oak Hill WV.

I also received channel 16 from Dayton OH, the full 125 miles distance.
And that was on a VHF-only antenna ... sideways!! (some snow, full color)


| If COFDM were used the same 125 mile reception or interference problem
| would exist at the same power level. Still a bad idea.

I don't know how well 8VSB will work at 125 miles if the FCC decreases
the co-channel distances between stations. But if they leave them about
the same, it should work well. A directional antenna should do well to
capture the signal it is aimed at even if the other signal is stronger,
especially with 8VSB.


| Qualcomm, Crown Castle and others will not use, nor can they use, power
| levels like those used by full power broadcasters. They are limited by
| law to 50 kW.

I don't expect THEM to achieve the 125 mile range. I do expect the fixed
TV broadcasters to do so. I would expect them to cover all of WV with
transmitters to get 100% coverage, in time. The regular broadcasters
won't have that issue as much.


| And they are building nationwide SFN networks that have the same
| programming. They will be able to design a modern network and may if
| they are smart be using power levels and innovative ideas that are far
| more imaginative far far lower power than 50 kW.
|
| And if they do they will have ubiquitous coverage that will work on the
| simplest antennas.

Great. Then let's just move along exactly as we are headed now, with both
8VSB on 51 and and down, and COFDM on 52 and up, and a choice in type of
service. Lets not delay the transition with yet another pointless debate
about modulation.

Look at it this way: if 8VSB dies, you can bid on the spectrum it leaves
unused. So just be quiet and maybe your wish will come true.

--
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| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
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.

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