Section 114, FMF Flashcards
(12 cards)
Define HF and discuss its basic applications
HF – High Frequency: Capable of both long and short-range secure voice and data comm.
Most of the world refers to the HF Band as the frequencies between 3 – 30 MHz.
Two types of HF Propagation: Ground Wave & Sky Wave
What are the modes of HF radio wave propagation?
Ground wave and sky wave
Define UHF and discuss its basic applications
UHF – Ultra High Frequency: Most of the world refers to the UHF Band as the frequencies between 116 to 150 MHz and 225 to 400 MHz. MAGTF UHF radio sets (ie, AN/PRC-113) are capable of data communications at 16 kilobits per second (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.
Define VHF and discuss its basic applications
VHF – Very High Frequency: Most of the world refers to the VHF Band as the frequencies between 30 – 87.975 MHz.
What is SINCGARS?
Single Channel Ground and Airborne Radio (SINCGAR) set, AN/PRC 119. It can be used as a man pack radio or a vehicle mounted radio.
What are the two modes of operation for the SINCGARS?
Single Channel – When in SC mode, you are operating on one frequency.
What is Frequency Hopping?
Frequency Hopping – FH mode is used for secure transmissions due to the radio frequency constantly shifting to reduce or eliminate the threat of jamming, interception, and direction finding
Recite the Phonetic Alphabet.
Alpha/Bravo/Charlie/Delta/Echo/Foxtrot/Golf/Hotel/India/Juliet/Kilo/Lima/Mike/ November/Oscar/Papa/Quebec/Romeo/Sierra/Tango/Uniform/Victor/Whiskey/X-ray/Yankee/Zulu
What are the three levels of security classification?
Top Secret: Top Secret is the classification level applied to information whose unauthorized disclosure could reasonably be expected to cause exceptionally grave damage to the national security
Secret: Secret is the classification level applied to information whose unauthorized disclosure could reasonably be expected to cause serious damage to the national security
Confidential: Confidential is the classification level applied to information whose unauthorized disclosure could reasonably be expected to cause damage to the national security
Describe sky wave propogation.
Involves the bending of the signal by the ionosphere. The reflective nature of the ionosphere will change when sunlight hits it each day. Therefore, at least 2 frequencies are usually required during a 24-hour period: a low, night frequency and a higher, day frequncy.
Describe ground wave propogation.
Involves the transmission of a signal along the surface of the ground. The max range of 20-30 km may be decreased by heavy vegetation, mountainaous terrain, or dry desert soil.
Describe Tactical Chat (TAC CHAT)
Near-real-time synchronous conferencing capability designed for group and private message data transfers to provide online comms with other users. Provide situations awareness with others through increased information volume
