Combat Communications Flashcards
7 cards from real FMF practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Combat Communications flashcards as text
What frequency range is typically associated with VHF (Very High Frequency) communications?
Answer: 30–300 MHz
VHF communications operate in the 30–300 MHz range, and are commonly used for short-range tactical communications in the Marine Corps.
Which of the following best describes 'frequency hopping' in secure radio communications?
Answer: Rapidly switching transmission frequencies in a pre-determined pseudo-random sequence to prevent jamming and interception
Frequency hopping spreads transmissions across many frequencies in a synchronized pseudo-random pattern, making it extremely difficult for adversaries to intercept or jam.
What does the proword 'BREAK' indicate when used in voice communications?
Answer: A separation between portions of the message, especially between the address and the text
'BREAK' is used to indicate a separation between portions of a message, most commonly between the address group and the text, to improve clarity.
In what situation would a Marine use a 'relay station' for communications?
Answer: When terrain or distance prevents two stations from communicating directly
A relay station is used when terrain masking or excessive distance prevents two stations from achieving direct radio contact, allowing a third station to pass traffic between them.
What is the correct format for a standard military grid reference used in communication messages?
Answer: A six-, eight-, or ten-digit grid reference based on the Military Grid Reference System (MGRS)
MGRS grid references provide a standardized, concise way to communicate locations on military maps using six, eight, or ten digits for varying levels of precision.
What action should a radio operator take if they suspect an enemy is attempting to 'spoof' their net?
Answer: Challenge the unknown station using authentication procedures
Authentication challenges verify that a station is friendly by requiring a correct response known only to authorized net members, countering spoofing attempts.
Which type of wire line provides the most secure means of battlefield communication?
Answer: Secure voice over fiber-optic cable
Fiber-optic cable does not emit electromagnetic radiation and is extremely difficult to tap, making it the most secure wire-line communication method in a battlefield environment.