Questions and CORRECT Answers
If the is known, it is simple to calculate the angle of incidence required for the wave to return to
ground. - CORRECT ANSWER - Virtual Height
F1 - CORRECT ANSWER - 90-150 mi
Critical frequency of F1 layer - CORRECT ANSWER - 5 MHz
Highest frequency that will be returned down to earth - CORRECT ANSWER - Critical
frequency
Shortest distance from a TX measured along the surface of the earth - CORRECT
ANSWER - Skip distance
If TX height = RX height, what is the max distance between 2 towers for LOS communications -
CORRECT ANSWER - 8 Hr
Maxwell's equation - CORRECT ANSWER - "that a changing magnetic field will produce
an electric field and that a changing electric field will produce a magnetic field"
Contains only reactive energy since electric and magnetic fields are 90 deg out of time phase. Of
importance only in the immediate vicinity of the antenna. - CORRECT ANSWER -
Induction field
Consists of the lines of force which have become detached from the antenna and are moving out
into space as an electromagnetic wave. Electric and magnetic fields are in time phase. -
CORRECT ANSWER - Radiation field