713quiz4sol

713quiz4sol - (a) systems typically operate below a...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
713 Quiz 4: May 21st, 2004 Name:_______________________________ Circle the answer that is most correct. (i) A 10 MHz vertically polarized transmitter radiates groundwaves over soil with relative permittivity Find the numerical distance at a distance of 5 km from the transmitter. (a) 0.287 (b) 14.6 (c) 30.9 (d) 3621 (e) 17872 (ii) Which of the following statements are true about ground waves? (a) with all other parameters fixed, horizontally polarized groundwaves attenuate more rapidly than vertically polarized groundwaves (b) increased field strengths may not always be received as antenna heights are increased (c) the planar Earth theory of groundwaves predicts a transition from a 1/distance behavior for field amplitudes to a 1/(distance squared) behavior (d) all of the abo v e (e) none of the above (iii) Which of the following is true about communication systems using tropospheric scatter?
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: (a) systems typically operate below a frequency of 100 MHz (b) lar ge antennas and high po wer transmitters are required (c) communications with signal bandwidths > 100 MHz are easily established (d) all of the above (e) none of the above (iv) In the Chapman theory of ionized atmospheric layers, which of the following is true? (a) the electron density of a recombination layer is minimum when the sun is directly overhead (b) the electron density of an attachment layer is minimum when the sun is directly overhead (c) the electron density of a recombination layer is a decreasing function of altitude (d) the electron density of an attachment layer is a decreasing function of altitude (e) none of the above 30 j 18. p...
View Full Document

Ask a homework question - tutors are online