19 / 20

Quasi-optical waves travel...

  • A

    through the air directly from the transmitter to the receiver.

  • B

    along the surface of the earth.

  • C

    through the air and are influenced (e.g. reflected) by the ionosphere.

  • D

    along the surface of the earth, but are absorbed by the sea.

The Space Waves (or line-of-sight waves) are the radiowaves of very high frequency, between 30 MHz to 300 MHz (VHF) or more.

The space waves can travel through atmosphere in a straight line from transmitter antenna to receiver antenna either directly or after reflection from ground in the earth’s troposphere region. That is why the space wave propagation is also called as tropospherical propagation.

VHF propagates as quasi (almost)-optical, direct wave, which are also space waves.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • Austro Control