NAVEDTRA 15031 Module 2, Chapter 2

Question 1

Most practical antennas are divided into how many classifications?

Answer 1

Two: Hertz Antennas and Marconi Antennas

Question 2

Reciprocity is what?

Answer 2

The ability to use the same antenna for both transmitting and receiving.

Question 3

What can you look at to determine an antennas directivity?

Answer 3

Radiation pattern

Question 4

The ground screen is composed of what?

Answer 4

A series of conductors arranged in a radial pattern and buried 1 or 2 feet below the surface of the earth.

Question 5

Counterpoise is used when _____?

Answer 5

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.

Question 6

What is the main difficulty in VLF and LF antenna design?

Answer 6

The physical disparity between the maximum practical size of the antenna and the wavelength of the frequency it must propagate.

Question 7

Yagi is _____?

Answer 7

An end fired plastic array

Question 8

The inverted cone antennas are _____ polarized.

Answer 8

vertically

Question 9

Conical Monopoles are shaped like what?

Answer 9

Two truncated cones connected base to base

Question 10

Whip antenna lengths vary from _____?

Answer 10

12-35 feet

Question 11

A broadband antenna composed of five wires, each cut for one-quarter wavelength at the lowest frequency to be used, is called what?

Answer 11

Wire-Rope Fan Antenna

Question 12

What is the reason for the high installation of UHF/VHF antennas onboard ships?

Answer 12

Vertical conductors such as masts, rigging, and cables in the vicinity cause unwanted directivity in the radiation patter

Question 13

The center-fed dipole is designed for use at an average power rating of?

Answer 13

100 watts

Question 14

What does the term SATCOM refer to?

Answer 14

Satellite Communication System

Question 15

AS-2815/SSR-1 is used to receive what signal?

Answer 15

Fleet broadcast

Question 16

The OE-82B/WSC-1(V) interfaces with what transceiver?

Answer 16

AN-WSC-3

Question 17

Hemispherical coverage for the AN/WSC-5(V) is from _____?

Answer 17

0-110 degrees

Question 18

Which antenna is a 16 turn helical antenna with right hand circular polarization?

Answer 18

Andrew 58322 Shore Antenna

Question 19

The Andrew 58622 operates in what frequency range?

Answer 19

240-315 MHz

Question 20

The AN/WSC-6(V) use antennas that provide?

Answer 20

LPI (low probability of intercept)

Question 21

ADNS interfaces with all RF media from _____ to _____.

Answer 21

HF to EHF

Question 22

What operation provided the lessons learned to make the decision to equip all Navy ships with INMARSAT?

Answer 22

Desert Storm

Question 23

On large deck ships, CBSP provides a bandwidth up to _____?

Answer 23

21.4 mbps

Question 24

The SA-2112A satisfies requirements for an integrated _____ system.

Answer 24

secure/non-secure

Question 25

Which piece of equipment is used as a UHF transceiver?

Answer 25

AN-WSC-3

Question 26

The SB 4124 allows how many circuits per channel?

Answer 26

24

Question 27

Which piece of equipment is used to encrypt data on a circuit?

Answer 27

KG-84

Question 28

The KY-58 is primarily used to _____ radio communication.

Answer 28

encrypt

Question 29

The ANDVT is used primarily for what kind of voice communications?

Answer 29

Secure

Question 30

Which circuit would you use for UHF simplex data TTY?

Answer 30

Bravo

Question 31

Delta is used for _____.

Answer 31

HF simplex data TTY

Question 32

Charlie is used for _____ duplex data TTY.

Answer 32

UHF duplex data TTY

Question 33

What is the best choice for HF duplex data TTY?

Answer 33

Golf

Question 34

What is SATHICOM used for?

Answer 34

UHF satellite secure voice