NAVEDTRA 15031 Module 2, Chapter 2 Flashcards
Most practical antennas are divided into how many classifications?
Two: Hertz Antennas and Marconi Antennas
Reciprocity is what?
The ability to use the same antenna for both transmitting and receiving.
What can you look at to determine an antennas directivity?
Radiation pattern
The ground screen is composed of what?
A series of conductors arranged in a radial pattern and buried 1 or 2 feet below the surface of the earth.
Counterpoise is used when _____?
Easy access to the base of the antenna is necessary or when the area below the antenna is not a good conducting surface, such as solid rock or sandy ground.
What is the main difficulty in VLF and LF antenna design?
The physical disparity between the maximum practical size of the antenna and the wavelength of the frequency it must propagate.
Yagi is _____?
An end fired plastic array
The inverted cone antennas are _____ polarized.
vertically
Conical Monopoles are shaped like what?
Two truncated cones connected base to base
Whip antenna lengths vary from _____?
12-35 feet
A broadband antenna composed of five wires, each cut for one-quarter wavelength at the lowest frequency to be used, is called what?
Wire-Rope Fan Antenna
What is the reason for the high installation of UHF/VHF antennas onboard ships?
Vertical conductors such as masts, rigging, and cables in the vicinity cause unwanted directivity in the radiation patter
The center-fed dipole is designed for use at an average power rating of?
100 watts
What does the term SATCOM refer to?
Satellite Communication System
AS-2815/SSR-1 is used to receive what signal?
Fleet broadcast
The OE-82B/WSC-1(V) interfaces with what transceiver?
AN-WSC-3
Hemispherical coverage for the AN/WSC-5(V) is from _____?
0-110 degrees
Which antenna is a 16 turn helical antenna with right hand circular polarization?
Andrew 58322 Shore Antenna
The Andrew 58622 operates in what frequency range?
240-315 MHz
The AN/WSC-6(V) use antennas that provide?
LPI (low probability of intercept)
ADNS interfaces with all RF media from _____ to _____.
HF to EHF
What operation provided the lessons learned to make the decision to equip all Navy ships with INMARSAT?
Desert Storm
On large deck ships, CBSP provides a bandwidth up to _____?
21.4 mbps
The SA-2112A satisfies requirements for an integrated _____ system.
secure/non-secure
Which piece of equipment is used as a UHF transceiver?
AN-WSC-3
The SB 4124 allows how many circuits per channel?
24
Which piece of equipment is used to encrypt data on a circuit?
KG-84
The KY-58 is primarily used to _____ radio communication.
encrypt
The ANDVT is used primarily for what kind of voice communications?
Secure
Which circuit would you use for UHF simplex data TTY?
Bravo
Delta is used for _____.
HF simplex data TTY
Charlie is used for _____ duplex data TTY.
UHF duplex data TTY
What is the best choice for HF duplex data TTY?
Golf
What is SATHICOM used for?
UHF satellite secure voice
