Broadcast Signals
We have some familiarity with broadcast antennas.
They are used to transmit radio and television signals, sound and video patterns.
We also have some familiarity with receiving antennas.
We know that electromagnetic waves of certain frequencies emanate
from the transmission towers to the receiving antennas.Most people know that these broadcast signals move very swiftly.
Usually, only fractions of a second are involved
for most nearby or local transmissions.
At any given moment, a very small fraction of the signals for a program
are in the electromagnetic form, in the airways.We may know that the energy supporting a broadcast station
is in the tens of thousands of watts.
We may know that the signal received
may be in the milliwatt or even microwatt range.
A very small portion of the broadcast signal energy is required to receive the pattern,
to amplify it and to reconstruct the signal for monitoring or viewing.Fundamental to all of this is the understanding
that an electromagnetic wave is generated
from the motion of the charges called electrons.{ to be continued . . . }
copyright 2011, 2013, ECOhealth / Eve Revere
Broadcast Signals
December 16, 2013 by admin
