Why, in actuality, are only 124 or even less channels used instead of the total available 125 channels?
(a) Why, in actuality, are only 124 or even less
channels used instead of the total available 125
channels?
(b) What is the maximum distance between two
antennas for LOS transmission if the Transmitting
antenna is 100m high and the receiver is at ground
level? Now suppose that the receiving antenna is raise
10m high. To achieve the same distance, how high
must the transmitting antenna be? Analyze the benefit
of the new Tx height.
(c) Define link budget? Let’s estimate the feasibility of a 100
km link, with one access point and one client radio. The access
point is connected to an antenna with 10dBi gain, with a
transmitting power of 30dBm and a receive sensitivity of -89
dBm. The client is connected to an antenna with 10dBi gain,
with a transmitting power of 35dBm and a receive sensitivity
of -85dBm. The cables in both systems are short, with a loss of
7dB at AP side and 14dB at client end with 1800 MHz
frequency of operation. Calculate the expected power received
and explain the link margins from both points with a suitable
diagram?
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