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MTN COMM Exam Study Guide.
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MTN COMM Exam Study Guide. Omni-directional - answerRadiates and receives radio waves in ALL directions. Uni-directional - answerRadiates and receives radio waves in ONLY ONE direction. Bi-directional - answerRadiates and receives radio waves in TWO directions. Diffraction - answerThe process b...

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  • September 17, 2024
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  • 2024/2025
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©THEBRIGHTSTARS 2024


MTN COMM Exam Study Guide.


Omni-directional - answer✔Radiates and receives radio waves in ALL directions.

Uni-directional - answer✔Radiates and receives radio waves in ONLY ONE direction.

Bi-directional - answer✔Radiates and receives radio waves in TWO directions.

Diffraction - answer✔The process by which electromagnetic waves are bent so that they appear
behind an obstruction.

Directivity - answer✔The property of radiating more energy in some directions than in others.

Gain - answer✔The increase in signal strength that is produced by an amplifier.

Impedance - answer✔The measure of how difficult it is for current to flow through a conductor.

Noise - answer✔Random pulses of electromagnetic energy generated by lightning or electrical
equipment.

Reflection - answer✔The turning back of a radio wave from an object or the surface of the
earth.

Refraction - answer✔The bending, or changing direction, of a radio wave passing into or
through layers of the atmosphere or the ionosphere that have different density (dielectric
constant).

Resistance - answer✔The property of material or substance to oppose the passage of current
through it, thus causing electrical energy to be converted into heat energy.

Resonance - answer✔The state or frequency of vibration, electrical or mechanical, in which
forces that impede the motion are minimum.

Skip zone - answer✔Is the area that starts when the ground wave ends and continues until the
sky wave hits the earths surface.

Take off angle - answer✔The angle measured from the earths surface or horizontal up to the
direction of propagation towards the ionosphere.

, ©THEBRIGHTSTARS 2024
NVIS - answer✔Near Vertical Incidence Sky wave allows for decreased skip zones and is
extremely beneficial when operating in complex compartmentalized terrain. NVIS in theory
allows for successful communications in distances ranging from 10-300 miles.

Critical Angle wave - answer✔Is the steepest angle that a radio wave hits the ionosphere and is
reflected back to the earths surface vice punching through the ionosphere and continuing into
space.

ALE - answer✔Automatic Link Establishment is the process of making a point to point radio
connection. I'm ALE mode the radio scans for the best link ( frequency) to be utilized.

LQA - answer✔Link Quality Analysis is a test to measure the signal strength between radios.
This is an ALE function. Optimal range is 70-100.

LDV - answer✔Last Ditch Voice is a 3G voice capability. It sends a voice message over the air
as data which is then decrypted on the receiving voice end. The PRC-150 can store up to 1 LDV
at a time. Think of this function as a voicemail.

SINCGARS - answer✔Single Channel Ground Air Radio System provides Electronic Counter-
Counter measure freq hopping and single channel FM voice and data capability in the VHF band.

DAMA - answer✔Demand Assigned Multiple Access is satellite communications that utilize
the UHF band. The continental US (CONUS) are the (2) satellites we use in North America. F-6
sits at 105 degrees W and F-7 sits at 100 degrees W

SAA - answer✔Satellite Access Authorization is a product from a submitted Satellite Access
request.

VSWR - answer✔Voltage Standing Wave Ratio the ratio of the amplitude of the electric field
or voltage at a voltage maximum to that at an adjacent voltage minimum.

Conductor - answer✔A material ( usually metal ) that has low resistance to the flow of
electrical current.

Types of Conductors - answer✔Silver, copper, and aluminum

Counterpoise - answer✔A conductor or a system of conductors used as a substitute for ground
in an antenna system.

Transmission lines - answer✔A conductor that transfers RF energy from transmitter to the
antenna.

Reflector/Directors - answer✔Reflectors consist of wire conductor behind the antenna and
directors consist of a wire conductor placed in front of the antenna. The reflector/director is not
physically connected to the antenna. A director will be 95% of the antenna length and the
reflector will be 105% of the antenna length.

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