WTN - RF Signals and Concepts

Question 1

Azimuth and elevation charts depict radiation patterns on which planes?

Answer 1

Azimuth - horizontal plane
Elevation - vertical plane

Question 2

what are the three types of antennas?

Answer 2

omnidirectional, highly directional and semi-directional

Question 3

how do you find the beam width of a signal?

Answer 3

find the maximum point of power, move along line to the point where power drops by 3 dB, draw a line from this point to the origin, measure the angle

Question 4

what is dynamic beamforming?

Answer 4

dynamic beamforming uses and adaptive antenna array that can change on a frame-by-frame basis.

Question 5

Visual Line Of Sight is all that is needed to guarantee a successful RF transmission (T or F)

Answer 5

False

Question 6

The area around the visual line of sight is called…

Answer 6

the Fresnel Zone (pronounced Fruhnel zone)

Question 7

At what distance between antennas does the earth’s bulge begin to impede on the Fresnel Zone?

Answer 7

7 miles

Question 8

Name two types of omnidirectional antennas

Answer 8

dipoles and collinear

Question 9

name two types of highly directional antennas

Answer 9

patches array and parabolic dish antennas

Question 10

name two types of semi directional antennas

Answer 10

yagi-uda and sector antennas

Question 11

lightning arrestors defend against…

Answer 11

transient currents

Question 12

lightning arrestors do not protect against…

Answer 12

direct lightning strikes

Question 13

these antennas have one main lobe and several minor lobes

Answer 13

directional antennas