WTN - RF Components

Question 1

Two ways to increase output power from an antenna?

Answer 1

Minimize cable loss, use signal amplifiers

Question 2

EIRP is?

Answer 2

the highest RF signal strength that is transmitted from a particular antenna

Question 3

What are the units of absolute power?

Answer 3

watt (W), milliwatt (mW) and decibels relative to 1 milliwatt (dBm)

Question 4

What are the units of relative power?

Answer 4

decibel(dB), decibels relative to an isotropic radiator (dBi) and decibels relative to a half-wave dipole antenna (dBd)

Question 5

a milliwatt is…

Answer 5

1/1000th of a watt

Question 6

if the original power of a signal is 100mW and is decreased to 50 mW, how many dB has it been decreased by?

Answer 6

3 dB

Question 7

An Isotropic Radiator is…

Answer 7

a theoretical point source antenna that radiates power equally in all directions. it does not exist in reality.

Question 8

a 3 dB gain antenna on a 100mW IR will give you an EIRP of…

Answer 8

200mW

Question 9

dBd is…

Answer 9

decibels equivelent to a half wave dipole antenna

Question 10

A half wave dipole has a 2.14dB gain over…

Answer 10

an isotropic antenna

Question 11

why does a half wave dipole antenna have a gain of 2.14 dB greater than an isotropic radiator?

Answer 11

he dipole concentrates the energy in certain directions

Question 12

3 dB gain is…

Answer 12

double the power

Question 13

3dB loss is

Answer 13

half the power

Question 14

10 dB gain is

Answer 14

10 times the power

Question 15

10dB loss is

Answer 15

1/10th the power

Question 16

SNR or SINR is the preferred measurement of outside influences affecting an RF signal

Answer 16

SINR

Question 17

what is the forumla for EIRP in dBm?

Answer 17

EIRP (dBm) = transmitted power (dbm) + antenna gain (dBi) - connector and cable loss (dB)

Question 18

a link budget is…

Answer 18

the sum of all gains and losses in the signal path between transmitter and reciever