Note that these $10 devices usually contain a single 5 cent ceramic capacitor
as their 'sophisticated electronic circuitry'. The rest of the fancy plastic
case is just for show.
|NotTaR of Television Sets : About gadgets to use house wiring as TV ..
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(The following is from: Greg Smith (LiveTV@en.com).)
Most people mistakening believe that the larger the antenna the better
the received signal. The truth of the matter is that each element of
the antenna must be cut to a precise length depending upon the
frequency of the signal you are attempting to receive. Further more,
each element must also be spaced a precise distance away from the
others. This creates what is commonly called a "directional array".
(see diagram below) By providing enhanced reception (gain) in the
direction the antenna is pointed, it also provides decreased reception
from the sides and back. (directivity) This prevents "ghosting" which
is caused by the same signal arriving at the TV at a slightly
different time because the signal bounced off of some structure on
it's way to your set.
If you use the house wiring as the antenna, the length will be random
and the orientation to the received signal will also be random.
Therefore it will pickup the bounced/reflected signals just as well as
the primary signal. IE: lots of ghosting = very poor picture quality.
Any kind of directional antenna, even a small one, whether inside or
outside, should provide a superior quality picture to that from the
device you are talking about. Even a cheap "rabbit ear" antenna
mounted on top of the set allows you to orient it in the best
If you only receive the VHF channels (2-10) in your area then buy a
VHF ony antenna. If you only receive the UHF (19-60+) then buy a UHF
only. If you get some of each then make sure that it is a combination
antenna. If your set has separate inputs for VHF/UHF make sure you
also get one with the proper splitter.
direction of signal
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