Question

In tropospheric scattering, rapid fading occurs due to _______ and long-term fading occurs due to ______

(a) multipath propagation, turbulences in atmosphere

(b) low signal strength, signal travelling below horizon

(c) signal travelling below horizon, low signal strength

(d) daily and seasonal variations, multi-path propagation

I had been asked this question during a job interview.

I'm obligated to ask this question of Space Wave Propagation in portion Space Wave Propagation of Antennas

Answer 1

Correct choice is (a) multipath propagation, turbulences in atmosphere

To explain I would say: Rapid fading occurs due to the multipath propagation. As the turbulent conditions changes constantly, the path length and signal strength levels also change. The turbulence in the atmosphere gives rise to daily and seasonal variations in signal strength so results in long-term fading.