ATSEP: C QUESTIONS AND ANSWERS
If the is known, it is simple to calculate the angle of incidence required for the wave to
return to ground. - Answers- Virtual Height
F1 - Answers- 90-150 mi
Critical frequency of F1 layer - Answers- 5 MHz
Highest frequency that will be returned down to earth - Answers- Critical frequency
Shortest distance from a TX measured along the surface of the earth - Answers- Skip
distance
If TX height = RX height, what is the max distance between 2 towers for LOS
communications - Answers- 8 Hr
Occurs when 2 waves that left 1 source and travelled by different path arrive at a point
after being reflected from ground. - Answers- Interference
Increases ground wave coverage - Answers- Antenna Gain
3-30GHz - Answers- SHF
Spectrum for high rate digital links, satellite, radar and navigation - Answers- EHF
Impedance of free space - Answers- 377 ohms
A form of electromagnetic radiation - Answers- Radio waves
Velocity of waves depends on the - Answers- Medium
Study of radiation patterns is simplified if the radiating element is considered - Answers-
Isotropic
Used for long distance telegraphy navigation such as Omega - Answers- Low
Frequency
Energy leaves transmitting antenna in the form of . - Answers- Wavefronts
Bending from high electron density to regions of lower electron density. - Answers-
Refraction
Determined by the position of the electric field with respect to the reflecting surface. -
Answers- Polarization
If the is known, it is simple to calculate the angle of incidence required for the wave to
return to ground. - Answers- Virtual Height
F1 - Answers- 90-150 mi
Critical frequency of F1 layer - Answers- 5 MHz
Highest frequency that will be returned down to earth - Answers- Critical frequency
Shortest distance from a TX measured along the surface of the earth - Answers- Skip
distance
If TX height = RX height, what is the max distance between 2 towers for LOS
communications - Answers- 8 Hr
Occurs when 2 waves that left 1 source and travelled by different path arrive at a point
after being reflected from ground. - Answers- Interference
Increases ground wave coverage - Answers- Antenna Gain
3-30GHz - Answers- SHF
Spectrum for high rate digital links, satellite, radar and navigation - Answers- EHF
Impedance of free space - Answers- 377 ohms
A form of electromagnetic radiation - Answers- Radio waves
Velocity of waves depends on the - Answers- Medium
Study of radiation patterns is simplified if the radiating element is considered - Answers-
Isotropic
Used for long distance telegraphy navigation such as Omega - Answers- Low
Frequency
Energy leaves transmitting antenna in the form of . - Answers- Wavefronts
Bending from high electron density to regions of lower electron density. - Answers-
Refraction
Determined by the position of the electric field with respect to the reflecting surface. -
Answers- Polarization
