Phila., the city of brotherly love has it. Many in Frisco want it…
Wireless broadband Internet access (long range wifi antenna) seems too decent to be true. At
relatively low cost, anyone can get on-line anywhere in a city. All the city
needs to do can be install WiFi antennas.
An argument in favor of citywide WiFi is it will reduce the digital divide:
the poorer you are, the larger limited your access to the Internet and its information
resources. Cities for instance Philadelphia and San Francisco are actively trying to close the exact
digital divide. One option is WiFi.
Yet around weighing the options, virtually nothing is heard about the potential health
pitfalls. Saturating an entire city with WiFi adds to the existing hassles of nonionizing
radiation. That burden, called electrosmog by quite a few, consists of long-term
exposure to low-level concentrations of non-ionizing the radiation from familiar sources
like radio and TV signal, electronic and electrical devices, and the ubiquitous cell
Wireless Internet Access
Local area networks (LANs) link computers, tools, modems, and other
devices. Traditional LANs make the links psychologically using wire cable. Messages
between computers and the many other devices on the network are managed by a device
known as router.
A wireless LAN does away with the wire cable employing a router that transmits and
receives radio signals. To use a wired LAN, you have to plug the computer or other
machine into a wall socket. A wire leads from the outlet to the router, which manages
signal traffic between the systems on the network.
With a wireless LAN, each device in the network is built so that it can send a signal
to the router and receive signals back. Wireless routers typically have many different a
hundred to several hundred feet. The range can be higher by adding a booster
that increases the signal strength.
Similar to all radio signals, the closer you are to the transmitter (the router) the
stronger the signal. Cell phones operate on the same principle. The difference is that
cell phones work at a different rate and put out a stronger signal than wireless
Cell phones operate at frequencies in the a few to 30 GHz range, similar to microwave
ovens. Mobile LANs operate at one tenth of that range–0. several to 3 GHz, the range of
UHF television broadcasts. GHz stands for gigaHertz, a standard measure
of radio frequency light (RFR)–electromagnetic radiation created by
sending an alternating electrical present-day through an antenna. The higher the GHz,
the faster the prevailing alternates.
Frequency by itself does not measure the potential effect of RFR. As you would
guess, the strength of the signal also makes a difference. The strength of a signal is measured
in watts, a standard small measure electrical energy. For example , a 100 watt
light bulb is happier because it puts out more energy than a 60 watt bulb.
Think of the effect of waves at the beach: small ocean far apart (low strength, low
frequency) versus sizeable wave close together (high strength, high frequency). The exact
former is likely to have less of an effect than the second.