Block 2 Lecture

Question 1

Describe a Transmission line

Answer 1

A device which guides electrical energy from one point to another.

Question 2

What is the purpose of a transmission line

Answer 2

Connects a source to a load

Question 3

Type parallel wire transmission line

Answer 3

Two parallel wire 1/4 inch to several ft apart

Question 4

Type twisted pair transmission line

Answer 4

Two insulated wires twisted together

Question 5

Type shielded pair transmission line

Answer 5

Parallel Conductors surrounded by a solid dielectric

Question 6

Transmission line classification (resonant line)

Answer 6

Also called “tuned” line. This line has standing waves and reflected waves on it, it is not terminated in its character impedance

Question 7

Transmission line classification (non-resonant line)

Answer 7

Exact opposite of resonant. Also called “un-tuned”. Has no standing waves and no reflections. This line is terminated in its . This is theoretically perfect transmission line.

Question 8

Transmission line principle

Answer 8

Characteristic impedance is equal at every point along the line

Question 9

Transmission line waves (incident wave)

Answer 9

Travels from source to load ->

Question 10

Transmission line waves (reflected wave)

Answer 10

Travels from load to source <-

Question 11

Transmission line waves (standing wave)

Answer 11

Results from the algebraic addition of the incident and reflected wave.

Question 12

What formula is E to I

Answer 12

Impedance formula

Question 13

RF load is also known as what

Answer 13

A dummy load

Question 14

What has a known amount of SWR. (4 words)

Answer 14

Mismatched offset termination

Question 15

Variable attenuator

Answer 15

Contains a rod or vein

Question 16

Fixed attenuator

Answer 16

Contains graphatized sand

Question 17

Isolators

Answer 17

Is a non reciprocal device deploying ferrits

Question 18

What does Correction graph show

Answer 18

Actually attenuation factor at specified frequencies

Question 19

What is the device called that tests pin depth

Answer 19

Dial indicator/Connection gage kit

Question 20

What injects a modulated signal into a line

Answer 20

Slotted line/swr meter

Question 21

Feed through termination

Question 22

Co-axial cable has two types what are they

Answer 22

Rigid coax and flexible coax

Question 23

Rigid coax characteristics

Answer 23

Central inside rigid outer coating

Question 24

Flexible coax characteristic

Answer 24

Rubber coating

Question 25

Wave guide characteristic

Answer 25

Has a rigid hollow metal or dielectric tube, Transmits high frequencies with the least amount of loss

Question 26

Standing waves ratio

Answer 26

Ideal ratio is 1:1 Vswr formula is emax/Emin

Question 27

4 type of Line losses

Answer 27

Copper losses, dielectric losses, induction losses, radiation losses.

Question 28

What is copper losses

Answer 28

Power loss (IR)^2 -ENERGY IS DISIPATED as heat.

Question 29

What is dielectric losses

Answer 29

Results in the heating of dielectric material

Question 30

What is induction losses

Answer 30

Current is induced into a nearby metal object and power is dissipated

Question 31

What is radiation loss

Answer 31

Magnetic lines of force are projected into space

Question 32

1 word that relates to attenuator

Answer 32

Reduce

Question 33

What has a known amount of (SWR) standing waves ratio

Answer 33

Mismatch/offset termination

Question 34

What is RF-filter allow

Answer 34

Allows specific frequencies to pass while rejecting others