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Phase 1 exam > Comm > Flashcards

Comm Flashcards

1
Q

Characteristics of Marine Corps Communications

A

Flexibility-need all types of comm for cerain situations
Reliability-needs to work
Security-COMSEC frequency hopping, measure taken to deny unauthorized persons info of value
Speed-set network up quickly

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2
Q

Types of Comm

A 
radio
wire
sound
visual 
Physical Comm-messengers, mail
Data-includes all computers and data transmission device
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3
Q

Radio comm or waves

A

uses energy in the form of electromagnetic waves that propagate through space at the speed of light

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4
Q

Frequency

A

wavelength is directlyy related, mesasured in terms of the number of waves generated(cycles) per second. 1 cycle per second is one hertz, RO’s freqs in the megahertz (millions of cycles per second

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5
Q

Ground Waves

A

travel from transmitting antenna along the surface of the earth

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6
Q

wavelength

A

longer wavelength lower freq allowsthe wave to bend around and over larger obstacles.
shorter wavelength-increases in freq ability to bend around obstacles decreases.

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7
Q

Sky waves

A

radio waves that travel up into the atmosphere. lower freq 2-12 MHz. used to bounce back off the atmosphere back to earth. increases range of our comm

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8
Q

HF

A

lower frequencies can communicate over great distances.
Use when long haul comm are necessary and no SATCOM is available.
equipment AN/PRC-150 man-portable
AN/MRC-148 vehicle mounted

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9
Q

VHF

A

Extends slightly beyond LOS, freqs in the 30MHz, ancts like HF ground waves, range of 40 km.
used in infantry battalions
Equipment-AN/PRC-119 man packed SINCGARS, AN/VRC-88 vehicular monted low power SINCGARS, AN/VRC-89 vehicular mounted dual SINCGARS with one low power and one with high power amp
CONS power output, terrain, atmospheric conditions

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10
Q

UHF (LOS)

A

strictly LOS, unable to bend around obstacles, range may extend 500km as long as airplane is high enough to be in LOS
Use for ground to air comm and air to air
Equipment AN/PRC-117/152/148 man portable, AN/VRC-103 vehicle

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11
Q

UHF(SATCOMM)

A

extends from earth to satellites and back down, high speed data communications
Use for long range tactical comm, can access k or 25k channels DAMA or dedicated
Equipment AN/PRC-117/152/148 man portable, AN/VRC-103/110 vehicle with power amp. AN/PRC-148 can be used for SATCOM only

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12
Q

SINCGARS

A

single channel ground air radio system, primary MAGTF VHF. lightweight radios , primary means of comm for command, control and fire support. provides high securityagainst enemy electronic warfare by using frequency hopping.

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13
Q

Freq hopping

A

a transmission technique that changes the freq of a radio channel automatically at a pseudo random rate common to the transmitter and receiver

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14
Q

5 variables required to freq hop

A

Hopset-the VHF freq that SINCGARS will hop through in freq hopping mode
Transmission security key (TSK) sequence in which the radio will hop within a hopset
Transmission encryption key (TEK) Encrypts and decrypts the operators voice during the radio transmission
Time-time in radios must be sync, manually inputed
NET ID-3 digit numeric code that determines where a specific frequency hopping circuit begins the frequency hopping, manually entered

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15
Q

COMSEC

A

the protection resulting from all measures designed to deny unauthorized persons information of value that might be derived from the possession and study of telecommunications or to mislead unauthorized persons in their interpretation of the results fo such possession and study

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16
Q

4 areas of COMSEC

A

Crypto Security
emission security
physical security
transmission security

17
Q

Crypto security

A

the componet of COMSEC that results from the provisions of technically sound crypto-systems and their proper use

18
Q

Emission security

A

componet which results from all measures taken to deny unauthourized persons info of value that might be derived from intercept and analysis of compromising emanations from crypto-equipment and telecommunications systems

19
Q

Physical security

A

all physical measures taken to safeguard classified equipment, material, and documents from access or observation by unauthorized persons

20
Q

Transmissions Security

A

results from all measures designated to protect transmissions from interception and exploitation by means other than cryptanalysis

21
Q

Electronic Warfare

A

term covering any militaryaction involving the use of electromagnetic or directed energy either to attack an enemy;s combat capapbility or to protect friendly combat capabilities against undesirable effects of friendly or enemy use of the electromagnetic spectrum

22
Q

preventive measures

A

reduce radio traffic to a minimum
SOPs brevity codes, minimum power settings, directional antennas
Use alternate means(wire, visual, Messenger)
COMSEC crypt equipment to secure transmissions

23
Q

Purpose of MC comm

A

To serve command

24
Q

what adds time to comm gear

A

PSN-13

25
Q

what is VULOS

A

VHF UHF Line of site

26
Q

how many watts does the AN/PRC-152 in high

A

5watts

27
Q

Whipp Antenna

A

used for VHF-HI VULOS 108-224.000 MHz and UHF Comm to talk to air in AM 225.000 MHz and above

28
Q

Blade antenna

A

talks SINCGARS and VHF-HI VULOS up to 108.000MHz

29
Q

AN/PRC-152 ability

A

to talk FM in both UHF and VHF modes

Can talk to PRC-148 MBITR

30
Q

Comm 201B

A

VHF, 40km, 200 watts

31
Q

AN/PRC-119

A

SINCGARS, VHF 30.000 to 87.975MHz

32
Q

Power settings

A

Low 200-400m
Medium 400-5k
High 5k-10km
Power amp 10km-40km

33
Q

VINSON=CT

A

Clear=PT

34
Q

SC-37.575

A

PT
VULOS
2#’s in front of decimal=FM
FM=3ft blade

35
Q

SC-356.275

A

PT
VULOS
3#’s in front of decimal=AM
AM use whip

36
Q

NET ID 759

A 
CT
Freq hop
FM
Frequency hopping
Put in NET ID
Button 7 will synch time
3ft blade

Phase 1 exam (16 decks)

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