Which frequency range will show little effect from precipitation?

In sky-wave propagation, frequencies higher than the critical frequency are

This occurs when high-energy ultraviolet light waves from the sun enter the ionospheric region of the atmosphere and strike the gas atoms.

On which regular ionospheric variation do sunspots occur?

Which types of polarization do most satellite communication terminals transmit and receive?

Line-of-sight (LOS) radio waves that are guided through the air between two layers of the atmosphere are known as

The term frequency of optimum transmission (FOT) is also referred to as the

The atmospheric recombination process is dependent on the

In a basic communication system, this is used to convert radio frequency (RF) current oscillation into electric and magnetic fields of force.

A resonant antenna effectively radiates a radio signal for frequencies close to its designed frequency. Which percentage range, plus or minus, is it usually within?

Which condition gives sky-wave propagation its ability to communicate beyond the optical line-of-sight (LOS)?

In sky- and ground-wave propagation, the area of silence where no signals are received is known as the

Which layer of the ionosphere is most important for high-frequency (HF) communications?

The concept where alternating current (AC) changes in magnitude, and reverses its direction during each cycle, is

The design frequency of a resonant antenna is 10 megahertz (MHz). What will be its frequency range?

The angle at which a radio wave enters the ionosphere is known as the

This occurs when a transmitted signal travels over two or more separate paths during transmission.

During which season do we have the wider range of critical frequencies and less absorption of all frequencies?

At which point do magnetic fields around a wire no longer have time to collapse completely between alternations?

The lowest frequency at which an antenna resonates is known as its

There are several critical sky-wave propagation angles and frequencies. Radio waves that angle too low are

How many layers make up the Earth’s atmosphere?

As ionospheric solar variations, sunspots are disturbances that appear and disappear

In radio-wave creation, which type of field detaches from the antenna and travels through space at great distances?

The ability of an antenna to both receive and transmit equally well is known as the antenna’s