Exam 13: Wave Propagation

Ionospheric storms often cause radio communications to become ____________

The greater the bandwidth,the greater the problem with ________________.

Which of the following is (are)the result of the interaction of changing electric and magnetic fields?

Skip distance is affected by the degree of _________________.

What type of system allows multiple inexpensive stations to be linked to a large,central installation?

What is the refracting and reflecting action of the ionosphere and the ground called?

The highest frequency that is returned to Earth when transmitted vertically under given ionospheric conditions is called the ____________.

A satellite communication system consists of an uplink,a downlink,and a(n)_______________.

What is the area called between the point where the ground wave is completely dissipated and the point where the first sky wave returns,no signal will be heard?

What principle states that each point on a spherical wavefront may be considered as the source of a secondary spherical wavefront?

Reception of the Sirius Satellite Radio signal is made possible using antennas,special chip sets,and _______________.

What type of orbit do geostationary orbits use?

Where would tropospheric scatter provide reliable long-distance communication links?

What type of information does Global Positioning System (GPS)provide?

What has a strong effect on ground waves?

Frequency blackouts are closely related to certain types of ____________.

Which of the following laws states that an electric current or a changing electric field produces a magnetic field?

If an electromagnetic wave were radiated equally in all directions from a point source in free space,what would result?

What is it called when the azimuth and elevation angles for the Earth station antenna must be calculated so that the correct satellite can be seen?

Which one of the following predicted the existence of electromagnetic waves and proposed that visible light was a form of electromagnetic energy?