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...
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.
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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