[opendtv] Re: Doug is Missing the Point
- From: Doug McDonald <mcdonald@xxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 12 Feb 2006 12:02:57 -0600
Stephen W. Long wrote:
> Doug, you are missing the point. With 8VSB you have to POINT the ANTENNA,
> indoors or outdoors to get reliable reception. With 8VSB we are back to
> the early 1960's, where you had to mess with the rabbit ears every time you
> changed the channel.
>
> 8VSB reception is so bad at my house I have the roof antenna pointed at one
> station (NBC), and I have to switch to an indoor rotating antenna for all
> other channels. I have to "tune" the reception with the signal meter on my
> Accuran box.
I have to use three different indoor antennas where I live to get
all stations. One is a 16 element Yagi, one is a 4 element Yagi,
and one is a Radio Shack double bowtie. Two of the three
will reliably get all but one in-market station without moving them.
One will reliably get only two in-market stations, but it is pointed in the
opposite direction to the others.
And WHY won't one antenna work without repointing?
I have something most people don't, which I installed
in order to have a real, honest, statement such as the following,
and that something is a spectrum analyzer.
You COFDM folks would of course shout "MULTIPATH". Actually that's
not true. There are SOME specific positions of some of the antennas
that will cause our strongest station to fail due to multipath,
but ONLY THAT ONE STATION. When the other stations fail, it is
normally NOT multipath but rather signal level. Yes, on rare occasions
some of the others will fail on the "wrong" antenna due to multipath,
but it is rare and only occurs during unusual tropo propagation
conditions.
The pro-COFDM people make one big assumption: everybody has a vast
excess of signal strength. That's simply WRONG here in market 82.
And it's true outside big cities everywhere. The 3 dB advabtage of ATSC is real.
It's real in terms of absolute signal strength, and its real in terms
of the required difference in signal strengths of co-channel
interfering signals. It also matters for adjacent channels.
Doug McDonald
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