Section 114

Question 1

Discuss the following single-channel radio frequency bands: UHF.

Answer 1

• Operates in the 116 to 150 MHz upper VHF frequency range and the 225 to 400 MHz military UHF radio spectrum
• MAGTF UHF radio sets such as the AN/PRC-113 are capable of data communications at 16 kbps under optimal conditions
• MAGTF ground and airborne UHF radios incorporate the HAVE QUICK Electronic Counter-Counter Measures capability and operate in single-channel and frequency hopping modes.
• The HAVE QUICK UHF radio is capable of remote operation by using the AN/ GRA-39B or HYX-57

Question 2

Discuss the following single-channel radio frequency bands: VHF

Answer 2

• Primary MAGTF VHF radio is the single-channel ground and airborne radio system (SINCGARS)
• SINCGARS is a family of lightweight combat radios that serves as the primary means of communications for command and control and fire support on the battlefield
• SINCGARS is the standard VHF-FM tactical radio for the Marine Corps
• System provides high security against threat electronic warfare (EW) by using frequency hopping with integrated COMSEC
• Capable of voice and data transmission (up to 16 kbps under optimum conditions and over limited distances) over the VHF-FM frequency range of 30 to 87.975 MHz’s

Question 3

Discuss the following single-channel radio frequency bands: HF

Answer 3

• Capable of both long- and short-range secure voice and data communications
• Data communications capability is typically limited to rates of 2.4 kilobits per second (kbps)
• Requires specific modems for data transmission
• High frequency communications are capable of traveling around the world under the right conditions
• HF transmission may be intercepted and traced by the enemy who is many hundreds of miles away

Question 4

Describe the phonetic alphabet.

Answer 4

A = ALPHA

B = BRAVO

C = CHARLIE

D = DELTA

E = ECHO

F = FOXTROT

G = GOLF

H = HOTEL

I = INDIA

J =JULIET

K = KILO

L = LIMA

M = MIKE

N = NOVEMBER

0 = OSCAR

P = PAPA

Q = QUEBEC

R = ROMEO

S = SIERRA

T = TANGO

U = UNIFORM

V = VICTOR

W = WHISKEY

X = X-RAY

Y = YANKEE

Z= Zulu

Question 5

Discuss communications security: Top Secret

Answer 5

Top Secret is the classification level applied to information whose unauthorized disclosure could reasonably be expected to cause exceptionally grave danger to the national security

Question 6

Discuss communications security: Secret

Answer 6

Secret is the classification level applied to information whose unauthorized disclosure could reasonably be expected to cause serious damage to the national security

Question 7

Discuss communications security: Confidential

Answer 7

Confidential is the classification level applied to information whose unauthorized disclosure could reasonably be expected to cause damage to the national security

Question 8

Discuss the purpose of Internet Tactical Chat in Support of Operations

Answer 8

• Tactical chat (TC) is a near-real-time, multi-participant means of textually communicating among military units
• TC allows for predominantly jam free communications, similar to radio voice communications, over the internet
• In some instances, TC is the most effective means for war fighters to communicate, especially when mission conditions hamper information that would typically pass over voice communications.
• Anyone with a computer, a network connection, and compatible TC software can communicate textually using TC

Question 9

What are the TWO MODES of operation for the Single Channel Ground and Airborne Radio System (SINCGARS)?

Answer 9

Single channel (SC)

Frequency hopping (FH)

Question 10

Using the metric system, what are the transmission RANGES for the SINCGARS radio?

Answer 10

LO (Low power) - 200 M - 400 M

M (medium power) - 400 M – 5 KM

Hi (high power) – 5 KM - 1OKM

PA (power amplifier) - 10 KM - 40 KM