Term
| Equipment used for generating, amplifying, and transmitting RF carrier is collectively called |
|
Definition
|
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Term
What basic receiver function involves having the transmitted electromagnetic wave pass
through the receive antenna in such a manner as to induce a voltage in the antenna? |
|
Definition
|
|
Term
| The ability to reproduce the input signal accurately is the characteristics of the receiver’s |
|
Definition
|
|
Term
A combination of a transmitter and receiver that is built as a single unit and sharing common
tuned circuits is called a |
|
Definition
|
|
Term
Which of the following cannot be performed by the transceiver’s computerized components
and micro-circuitry? |
|
Definition
|
|
Term
A transmission line that consists of a center conductor placed inside a metal tube functioning
as the outer tube is called a |
|
Definition
|
|
Term
Which selection best describes the term “cutoff frequency” when discussing transmission
line properties? |
|
Definition
| The frequency where XC causes the signal to be shunted |
|
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Term
Using figure 1–10, determine the wavelength if the frequency is changed from 150 MHz to
250 MHz. |
|
Definition
|
|
Term
Using figure 1–10, determine the electrical length if the frequency is changed from 150
MHz to 250 MHz |
|
Definition
|
|
Term
| A nonresonant transmission line is a line |
|
Definition
| having no reflected waves |
|
|
Term
| If a transmission line is terminated in a short, |
|
Definition
| current is at maximum and voltage at minimum at the termination |
|
|
Term
In a basic communication system, what converts radio frequency (RF) energy’s current
oscillation into electric and magnetic fields of force? |
|
Definition
|
|
Term
The concept that alternating current (AC) changes in magnitude and reverses its direction
during each cycle is |
|
Definition
| what makes radio transmission possible |
|
|
Term
If the electric field component travels in a plane perpendicular to the Earth’s surface, the
radio wave is |
|
Definition
|
|
Term
| What types of polarization do satellite terminals transmit and receive? |
|
Definition
| Transmit right hand and receive left hand circular polarizations |
|
|
Term
What measurement is used to determine whether an antenna is resonant at a particular
frequency? |
|
Definition
|
|
Term
The ability of an antenna to both receive and transmit equally well is known as the
antenna’s |
|
Definition
|
|
Term
| The standard used to measure the radiating effectiveness (gain) of an antenna system is the |
|
Definition
|
|
Term
What does the effectiveness of an entire transmitting and receiving system depend largely
upon? |
|
Definition
|
|
Term
| Which antenna radiates radio energy in a circular pattern? |
|
Definition
|
|
Term
Which antenna type is usually used on long-range, point-to-point circuits where the
concentrated radio energy is needed for circuitry reliability? |
|
Definition
|
|
Term
Ungrounded lengths of wire specifically designed to be either a half-wavelength or more
than full wavelength long is called a |
|
Definition
|
|
Term
| A long-wire’s takeoff angle depends on the antenna’s |
|
Definition
|
|
Term
| All antennas used in satellite communications are designed to be |
|
Definition
|
|
Term
| A common satellite antenna is the |
|
Definition
|
|
Term
| A helical antenna radiates a signal with what type of polarization? |
|
Definition
|
|
Term
| Aircraft antennas are housed |
|
Definition
| inside nonconductive radomes mounted outside or flush with the fuselage |
|
|
Term
In airborne antenna applications for frequencies in the upper portion of the HF band, what
vertical angles are used for multi-hop, long distance transmission? |
|
Definition
|
|
Term
| What determines an antenna’s location and orientation on the aircraft? |
|
Definition
| Optimizing the antenna’s radiating pattern for its application |
|
|
Term
Which type of airborne antenna can be designed into any part of an aerospace vehicle’s
surface, so that it does not upset its aerodynamic properties? |
|
Definition
|
|
Term
| In selecting an antenna for a circuit, what is the first thing to look at? |
|
Definition
|
|
Term
| Which object has the greatest effect on an antenna? |
|
Definition
|
|
Term
Where is the most challenging location for a radio frequency (RF) transmission systems
technician to establish and operate a radio station from? |
|
Definition
|
|
Term
| With a mountain between you and the distant end, which antenna is more effective? |
|
Definition
| Near-vertical incidence skywave |
|
|
Term
| Direct waves are radio waves that travel |
|
Definition
| through the air in a straight line |
|
|
Term
| Radio waves that travel near the earth’s surface are called |
|
Definition
|
|
Term
| Sky wave transmission is used for which type of communications? |
|
Definition
|
|
Term
| The path that undergoes a 180° phase shift is a |
|
Definition
|
|
Term
Which gives sky wave propagation its ability to communicate beyond the optical line-ofsight
(LOS)? |
|
Definition
|
|
Term
| Frequencies higher than the critical frequency are |
|
Definition
|
|
Term
In high frequency (HF) communications, the lowest frequency that arrives at the distant
receiver on 90 percent of the undisturbed days of the month is called the |
|
Definition
| lowest usable frequency (LUF). |
|
|
Term
| The abbreviation FOT is derived from the term |
|
Definition
| frequency of optimum transmission |
|
|
Term
| Magneton splitting creates two waves called |
|
Definition
| ordinary and extraordinary |
|
|
Term
What occurs when a transmitted signal travels over two or more separate paths during
transmission? |
|
Definition
|
|
Term
| What is the recombination process dependent upon? |
|
Definition
|
|
Term
| Which layer of the ionosphere is most important to high frequency (HF) communications? |
|
Definition
|
|
Term
During what season do we have the wider range of critical frequencies and less absorption
of all frequencies? |
|
Definition
|
|
Term
| Sunspots are disturbances |
|
Definition
|
|
Term
| For communications purposes, the usable frequency spectrum ranges from |
|
Definition
| 3 hertz (Hz) to 300 gigahertz (GHz+. |
|
|
Term
What U.S. government agency divides the radio frequency (RF) spectrum into different
bands? |
|
Definition
| Federal Communications Commission |
|
|
Term
| Near-vertical-incidence sky (NVIS) wave operations are most effective when you’re using |
|
Definition
| lower high frequency (HF) frequencies |
|
|
Term
| What frequency band is most susceptible to jamming? |
|
Definition
|
|
Term
| What frequency bands does the MILSTAR satellite system use? |
|
Definition
| Super-high frequency (SHF) and extremely high frequency (EHF). |
|
|
Term
The main very high frequency (VHF)/ultra high frequency (UHF) communications
emphasis is on |
|
Definition
| air-ground communications |
|
|
Term
| Super high frequency (SHF)/extremely high frequency (EHF) range is limited to |
|
Definition
|
|
Term
In a move to overcome the limited range of forward propagation by tropospheric scatter
(FPTS) without requiring many costly relay systems, what was developed? |
|
Definition
|
|
Term
| Why isn’t very high frequency (VHF) normally used for satellite communications? |
|
Definition
| Ionospheric refraction can occur |
|
|
Term
When comparing the radio and optical horizons, which one is farther away and by what
percent? |
|
Definition
|
|
Term
| When K is greater than 4/3, the radio horizon will |
|
Definition
|
|
Term
A radio wave originated at a center source in free space. If the field strength at one mile
from the source has a field strength of 100 microvolts per meter, what is the field strength at two
miles? |
|
Definition
|
|
Term
Any military action involving the use of the electromagnetic (EM) spectrum to include
directed energy to attack an enemy is called |
|
Definition
|
|
Term
| Which is not an example of electronic protection (EP)? |
|
Definition
| Communications intelligence |
|
|
Term
Which electronic warfare (EW) component responds to taskings to search for, intercept,
identify, and locate intentional and unintentional sources of radiated energy? |
|
Definition
|
|
Term
| Electromagnetic (EM) deception as it applies to electronic warfare (EW) is |
|
Definition
| the deliberate radiation of EM energy intended to convey misleading information to an enemy. |
|
|
Term
| What is the process of unscrambling encrypted information so that it is intelligible? |
|
Definition
|
|
Term
| How many selectable traffic key slots does the KG–84A have? |
|
Definition
|
|
Term
| Which switch on the KY–57 VINSON zeroizes channels one through five? |
|
Definition
|
|
Term
The common name for the method of changing the encryption keys over the radio channel
in a two-way radio system is called |
|
Definition
| over-the-air-rekeying (OTAR |
|
|
Term
| Centralized control of encryption keys will not reduce |
|
Definition
|
|
Term
In frequency hopping (FH) operation, the interval at which each transmitter remains on a
given frequency for a specific time is known as the |
|
Definition
|
|
Term
Which RT–1523 SINCGARS subassembly removes synchronization and frequency hopping
information that is embedded in a receive signal? |
|
Definition
|
|
Term
The RT–1523 SINCGARS radio’s time sync and correlator module manipulates control
signal outputs during the frequency hopping (FH) mode to |
|
Definition
| shut down reception and transmission during frequency shifts |
|
|
Term
Concerning HAVE QUICK II communications (MWOD), how long can each word of day
(WOD) be used? |
|
Definition
|
|
Term
Which one of the following statement is not a characteristic of the AN/GRC–171B(V)4
transceiver? |
|
Definition
| It operates from 116 MHz to 149.975 megahertz (MHz). |
|
|
Term
| What does the low-pass filter of the AN/GRC–171B(V)4 transceiver perform? |
|
Definition
| Image frequency rejection in receive and harmonic attenuation in transmit. |
|
|
Term
| The output power of the AN/GRC–171B(V)4 transceiver is |
|
Definition
| 20 Watts in AM, 50 Watts in FM |
|
|
Term
| The Joint Tactical Information Distribution System (JTIDS) is commonly referred to as |
|
Definition
|
|
Term
Which service uses the Enhanced Position Location Reporting System (EPLRS) to locate
and track amphibious assault craft? |
|
Definition
|
|
Term
| What type of network radio does the Air Force use for close air support? |
|
Definition
| Situation Awareness Data Link (SADL). |
|
|
Term
| How many programmable devices can the multiband inter/intra team radio hold? |
|
Definition
|
|
Term
What must the primary and remote annunciators be capable of in an intrusion detection
system (IDS)? |
|
Definition
| Operate independently of one another |
|
|
Term
| On a sensor system the annunciation display must be able to differentiate between |
|
Definition
|
|
Term
The interior sensor that operates on a principle of magnetic fields imposed on a reed switch
is a |
|
Definition
|
|
Term
Which personnel identification device provides positive identification through measurement
of biometrics? |
|
Definition
| Hand geometry unit (HGU). |
|
|
Term
On the advanced entry control system (AECS), which panel configuration monitors sensors
and reports any alarm conditions detected? |
|
Definition
|
|
Term
What device on the advanced entry control system (AECS) allows the operator to install,
review, modify, and broadcast databases created to all other workstations? |
|
Definition
| System administrator terminal. |
|
|
Term
How many hours of power must the uninterrupted power supply (UPS) in an advanced entry
control system (AECS) provide in the event that the station power is lost? |
|
Definition
|
|
Term
| Which site configuration was designed to provide coverage for a small geographical area? |
|
Definition
|
|
Term
What provides the interface between dispatch consoles and the central controller in a
trunking system? |
|
Definition
|
|
Term
| How many talkgroups can a trunked mobile radio monitor at one time? |
|
Definition
|
|
Term
| What has the ability to patch different talkgroups together? |
|
Definition
|
|
Term
What Air Force instruction (AFI) requires communications squadrons to maintain
“installation warning systems”? |
|
Definition
|
|
Term
| What is a common problem with a mass alert system in a deployed environment? |
|
Definition
|
|
Term
| In the Whelen siren stacks, what size driver does a speaker cell contain? |
|
Definition
|
|
Term
In the Whelen siren cabinet, what controls signal routing and power distribution of the
system? |
|
Definition
|
|
Term
| With the Whelen configuration software, which tabs allow you to troubleshoot the system? |
|
Definition
| Status and dual tone multi-frequency (DTMF). |
|
|
Term
| In high frequency (HF) communications, your station’s self address is |
|
Definition
| user programmed into your system |
|
|
Term
| We define link quality analysis (LQA) as |
|
Definition
| the process of sounding and determining channel clarity |
|
|
Term
| What is the maximum power of the AN/PRC–150 in frequency modulation (FM) mode? |
|
Definition
|
|
Term
Where do the modulation and digital-to-analog (D/A) conversion take place in the
AN/PRC–150? |
|
Definition
| Signal process and control module |
|
|
