between now and when I get new home service I am stuck on this
dreadful iPhone
<violins playing>
planning to go wireless BUT WITH A REAL KEYBOARD AND MONITOR
anybody use this type of device
Alfa 1000mw 1W Waterproof Marine high power Long Range Outdoor
802.11 G USB CPE wireless network Wifi Adaptor with Integrated 12dBi
2.4GHz Antenna
I have a legitimate use for it but it looks like it might be fun to
play with too
There is a long winded review article here (in the customer reviews),
that discusses the power the thing is allowed to use. The FCC gives
you a free license (you don't have to register or anything), up to
a certain power level. And that power level takes into account
Effective Radiated Power (you can violate the limit, if you
use a fancy enough antenna).
http://www.amazon.com/Alfa-802-11b-Wireless-Original-9dBi/dp/B001O9X9EU
With some antennas, the dBi improvement, comes at the expense of the
radiation pattern. For example, if you live in a two story house,
a fancy antenna can prevent a second story tenant, from being able
to Wifi with a first floor router. The signal goes further on the
second floor level, but the signal is lost on the first floor. And
it's a function of the radiation pattern that comes with a directional
antenna.
Antenna radiating patterns are three-dimensional. To pump more power
in a particular direction, means stealing power from another
direction. So be careful what you wish for.
http://www.antenna-theory.com/antennas/travelling/yagi6.jpg
Extra power isn't always what it's cracked up to be. In one
lab experiment, the reviewer installed an RF absorbing mat into
the lab, and the computer data transfer rate went up. If there
are significant reflections in the environment, a high RF power
can actually make things worse.
In isolated circumstances (you're in a farm house by yourself,
trying to reach the barn), all this dBi nonsense and high power
output gear makes sense. In an apartment building, it might be
worse than your low-power built-in Wifi (spend the money, and
be very unhappy). Wifi is fickle.
Paul