Which statement best identifies the requirements for two transceivers...
This is the best way to orient line-of-sight (LOS) antennas.
Which type of antenna radiates radio energy equally well in all...
This occurs when a transmitted signal travels over two or more...
The process of unscrambling encrypted information so that it is...
A combination transmitter and receiver, built as a single unit and...
Which US government agency divides the radio frequency spectrum into...
This occurs when high-energy ultraviolet light waves from the sun...
How long is each word-of-day (WOD) used with the HAVE QUICK II (HQII)...
A transmission line that consists of a center conductor, placed inside...
Radio waves that travel near the Earth's surface are called
The ability of an antenna to both receive and transmit equally well is...
In sky-wave propagation, frequencies higher than the critical...
This is one fundamental rule about camouflage.
Which type of conventional land mobile radio (LMR) device maximizes...
Which Air Force instruction (AFI) requires communications squadrons to...
The design frequency of a resonant antenna is 10 megahertz (MHz). What...
When siting a radio station, which type of foliage would have a more...
The common name for the method of changing encryption keys over the...
Which type of site configuration was designed to provide coverage for...
Which statement is not a benefit of having a trunking network?
In the giant-voice system, this controls the system's signal routing...
In radio-wave creation, which type of field detaches from the antenna...
Which tactical data link (TDL) is a secure, full-duplex,...
In high-frequency (HF) communications, your station's automatic link...
In sky- and ground-wave propagation, the area of silence where no...
Which type of polarization is used to radiate a signal using a helical...
This is the most effective type of antennas in mountainous terrain...
During which season do we have the wider range of critical frequencies...
As ionospheric solar variations, sunspots are disturbances that appear...
The angle at which a radio wave enters the ionosphere is known as the
How many layers make up the Earth's atmosphere?
This will likely result if a transmission line is terminated in an...
Where is the primary high frequency global communications system...
The concept where alternating current (AC) changes in magnitude, and...
Electromagnetic (EM) deception, as it applies to electronic warfare...
A waveguide is a type of transmission line that you would use
High-frequency (HF) transmissions are normally conducted in which two...
Which frequency band is most susceptible to jamming?
On which regular ionospheric variation do sunspots occur?
The ability of a receiver to reproduce the input signal accurately is...
In frequency-hopping (FH) operations, the interval at which each...
Direct waves are radio waves that travel
The atmospheric recombination process is dependent on the
Which layer of the ionosphere is most important for high-frequency...
Which type of cryptographic algorithm permits the encryption key to be...
Beam width of a directive antenna is measured at the
This is one of the simplest and most functional antennas in use
You should use this type of antenna to communicate over the horizon to...
All statements concerning waveguides are true except
This type of antenna is used to transmit and receive microwave signals
Which frequency range will show little effect from precipitation?
Line-of-sight (LOS) radio waves that are guided through the air...
Conductor material resistance in a transmission line leads to this...
Which type of hopping-rate category changes frequencies approximately...
In a basic communication system, this is used to convert radio...
At which point do magnetic fields around a wire no longer have time to...
Which types of polarization do most satellite communication terminals...
A resonant antenna effectively radiates a radio signal for frequencies...
What does the term "ICOM" indicate?
Leakage loss in a transmission line is minimized by using a
This is the correct statement concerning a wavelength.
This is the simplest form of an automatic link establishment (ALE)...
A nonresonant transmission line is one with
Which secure communications device operates by simply sliding the key...
Which is not a major component of the giant-voice system?
Which type of advanced waveform enables data and imagery situational...
The term frequency of optimum transmission (FOT) is also referred to...
The refractive index of air depends on moisture
In a land mobile radio (LMR) repeater system, a device that separates...
The lowest frequency at which an antenna resonates is known as its
Which multiple channel access method eliminates the requirement for a...
Determine the wavelength of a 250 megahertz (MHz) signal.
Where are aircraft antennas normally housed?
At which vertical angles should the multi-hop, long-distance...
When setting up a trunking network, users with common missions or...
Which electronic warfare (EW) component responds to a tasking to...
The ability of a receiver to reproduce the signal of a very weak...
Add this device to make a long-wire antenna more directional.
The minimum length of a long-wire antenna is
There are several critical sky-wave propagation angles and...
The Air Force integrates with modified close air support aircraft with...
The Earth's conductivity is determined by the type of
When comparing the radio and optical horizons, which one is farther...
Which condition gives sky-wave propagation its ability to communicate...
This matching device would be used to connect a 52-ohms RG–213...
A dipole or long-wire antenna is an example of a
How are most antennas designed that are used in satellite...
This has the greatest effect on an antenna's radiation pattern.
Which two transmission line properties determine its characteristic...
This term is used to describe radio waves that bend as they travel...
This provides the interface between dispatch consoles and the central...
This differentiates the enterprise land mobile radio (ELMR) network...
The amount of skin-effect loss is directly proportional to the
When discussing resonant and nonresonant transmission lines,
This is not a major network within the Military Auxiliary Radio...
Which process permits communication in shadow regions behind...
This matching device is inserted to make a transmitter "think" it is...
Which automatic link establishment (ALE) call option lets you call a...
Which type of advanced waveform was designed to operate on manned,...