(E)Element 3-40 Transmission Lines

Question 1

The VSWR of a microwave transmission line device might be measured using:

Answer 1

A dual directional coupler, a power meter, and a network analyzer

Question 2

The impedance total (ZO) of a transmission line can be calculated by ZO = √L/C when L and C are known. When a section of transmission line contains 250 microhenries of L and 1000 picofarads of C, its impedance total (ZO) will be:

Answer 2

500 ohms

Question 3

If long-length transmission lines are not properly shielded and terminated:

Answer 3

Communications receiver interference might result.

Question 4

A certain length of transmission line has a characteristic impedance of 72 ohms. If the line is cut at its center, each half of the transmission line will have a ZO of:

Answer 4

72 ohms

Question 5

Standing waves on a transmission line may be an indication that:

Answer 5

Some of the energy is not absorbed by the load

Question 6

What precautions should be taken with horizontal waveguide runs?

Answer 6

They should be sloped slightly downwards at the elbow and a small drain hole drilled in the elbow.