TN221_SECOND QUIZ - Microwave Communication

Microwave Communication is also coined as

• a. Line of Sight

• b. Radio wave

• c. Link Propagation

• d. None of the above

Determine the gain of antenna with a diameter of 1.5m. The frequency used is 6MHz with an aperture efficiency of 0.8.

• a. 4.44mdB     

• b. 3.44mdB

• c. 6.41mdB

• d. 4.61mdB

Areas of constructive and destructive interference created when electromagnetic wave propagation in free space is reflected (multipath) or diffracted as the wave intersects obstacles.

• a. Skip Zone

• b. Fresnel Zone

• c. Radio Zone

• d. None of the above

Calculate the first Fresnel zone of a LOS Communication with a frequency of 5GHz and a total distance of 25km. The distance of the other end of antenna is 3km and the other one if 6km.

• a. 5.67 km

• b. 6.75 km

• c. 6.57 km

• d. 7.65 km

Standard Condition of a K-Curve have an equivalent of

• a. k<1

• b. k=4/3

• c. k>4/3

• d. k=0

Microwave signals travel predominantly by Line of Sight

• a. True

• b. False

• c. Maybe

• d. None of the above

A numerical figure that considers the non-ideal condition of the atmosphere refraction that causes the ray beam to be bent toward the earth or away from the earth.

• a. K-Curve

• b. LOS 

• c. effective radius

• d. None of the above

Determine the effective earth radius with a mean sea level refractivity of 3 and an elevation of 6.

• a. 6685 km

• b. 6686 km

• c. 8665 km

• d. 6886 km

Two antennas have a distance of 6km and 8km. Calculate the distance an obstacle is raised higher in elevation owing to earth curvature.

• a. 2.7m

• b. 2.8m

• c. 2.9m

• d. None of the above

In case of space diversity, the antenna can have a _____% clearance at k=4/3 plus allowance for tree growth, buildings.

• a. 40

• b. 50

• c. 60

• d. 70