Radio Wave / Propagation

Question 1

What is the maximum separation between 2 stations communicating EME?

Answer 1

12,000 miles

Question 2

characteristics of LIBRATION FADING

Answer 2

FLUTTERY irregular

Question 3

HEPBURN maps predict

Answer 3

TROPOSPHERIC propogtion

Question 4

Tropospheric propogation occurs along what weather structure?

Answer 4

Warm and cold fronts

Question 5

propogation via RAIN SCATTER

Answer 5

rain must be within radio range of both stations

Question 6

Atmospheric ducts form over?

Answer 6

Bodies of water

Question 7

Which frequency range is most suited for meteor scatter?

Answer 7

28 MHz - 148 MHz

Question 8

What type of ATMOSPHERIC STRUCTURE can create a path for microwave

Answer 8

Temperature inversion

Question 9

Typical range for tropospheric propogation of microwave

Answer 9

100 miles to 300 miles

Question 10

What causes AURORAL activity?

Answer 10

interaction in the E LAYER

Question 11

emission best for AURORA propogation

Answer 11

CW

Question 12

What is meant by CIRCULARLY POLARIZED magnetic waves?

Answer 12

waves with a ROTATING electric field

Question 13

range for transequatorial propagation

Answer 13

5000 miles

Question 14

best time of day - transequatorial propagation

Answer 14

AFTERNOON or early evening

Question 15

extraordinary and ordinary waves

Answer 15

elliptically polarized

Question 16

bands best for long-path

Answer 16

160 meters to 10 meters

Question 17

band most frequently provides LONG PATH propagation

Answer 17

20 meters

Question 18

time of day SPORADIC-E most likely to occur

Answer 18

ANY time

Question 19

CHORDAL hop

Answer 19

Successive ionospheric reflections (without ground reflection)

Question 20

rising A or K index mean

Answer 20

INCREASING disruption of the geomagnetic field

Question 21

what paths experience high absorption when A or K index is high?

Answer 21

polar paths

Question 22

What does the value of Bz represent

Answer 22

Direction and strength (Southward orientation indicates disturbed conditions)

Question 23

How much does radio horizon distance exceed geometric?

Answer 23

15%

Question 24

What descriptor indicates the greatest solar flare intensity?

Answer 24

class X

Question 25

what does the space weather term G5 mean?

Answer 25

EXTREME Geomagnetic storm

Question 26

Intensity of X3 flare compared to X2

Answer 26

TWICE as great

Question 27

What does COACAP software model?

Answer 27

HF propagation

Question 28

As signal frequency increases, ground wave propagation…

Answer 28

DECREEASES

Question 29

Polarization best for GROUND-wave?

Answer 29

VERTICAL

Question 30

Sudden rise in BACKGROUND NOISE

Answer 30

a SOLAR FLARE has occured