UPSC-2014
1.
Calculate the maximum usable frequency for a transmitting station
having a critical frequency of 13 MHz propagating with an angle of
incidence of 60° for a given destination...
Solution:
Formula:
f1=
fc / cosθ -------------(1)
f1=
maximum usable frequency
fc=
critical frequency or highest frequency reflected at vertical
incidence from a given layer
θ=
angle of incidence
fc=
13 * 106 Hz
θ=
600
From
equation (1)
f1=
13 * 106 / cos 600
( cos600= 1/2)
=
2* 13* 106
=
26 * 106 Hz
Maximum
usable frequency (f1)= 26 MHz
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