[opendtv] Re: DVB-H first in the US
- From: Doug McDonald <mcdonald@xxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 20 Sep 2004 07:51:24 -0500
Bob Miller wrote:
> 1670-75 MHz that they bought in Auction #46
>
That frequency range is going to be interesting.
The Europeans are already wondering if their 200 MHz band
is too high frequency for digital mobile use. In England,
which is European and therefore oh so superior to us
benighted Americans, DAB is being used in that band .... and
they are having a terrible time with getting full mobile coverage,
simply because of dips in the road. Their ever so
politically correct and highly properly designed and oh so
carefully power allocated SFN structure is working well in
flat country and where there are no dips or small niches
between buildings ... but where their are such things,
the power is simply not making it into them. Whereas FM
continues to work, apparently because it is at a lower frequency and
diffracts into the nooks and crannies better.
At least that is what they are saying ... and they are saying that
higher frequencies will be worse.
Now we know that higher freqencies will go through
smaller holes than lower frequencies, so long as they
are going straight in. Apparently they actually need to
depend on diffraction.
*********************************************************
Or they need vastly higher powers.
Doug McDonald
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
