[opendtv] Re: Diversity USB DVB-T stick

On 2/25/07, Richard Hollandsworth <holl_ands@xxxxxxxxx> wrote:

Why would anyone be "annoyed" by the "need" to handle two antennas????

First of all, a maximal ratio diversity combiner, will automatically
"zero-out" the noise contribution from an unused antenna input
if the user only wanted to "bother" with one antenna.

Secondly, if both antennas are used, up to 3 dB of increased sensitivity
(in a uniform signal field) can be realized (as alluded to in the specs).

Thirdly, reception (esp. indoors)  has sweet spots is plagued with way
too many bad spots---the location of which will vary for different channels.
A dual (space) diversity antenna system significantly improves the
chance of finding a sweet spot for a particular channel.

With the two included short whip antennas, the "optimum spacing"
may be as far apart as the short cords permit....but it's gonna depend
on where those sweet spots are....

BTW: First thing to do is replace those whip antennas with a pair of
real indoor antennas (e.g. Silver Sensor).  Although in some locations,
a pair of monster Yagis may need to be mounted outdoors....

Although stacked antennas always seem to be the first thought---
here in the U.S. far more people would be ecstatic to be able
to point each antenna in a DIFFERENT direction.

Drat!!! Can only dream of Diversity Antenna for ATSC....must be "too
hard".....

holl_ands
[One of the rare owners of an actual ATSC "Smart Antenna".]


It is painful to see ATSC and Smart so close together.

Bob Miller


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