LESSON 1
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer and Feedback
1.
C.
ECM.
ELECTRONIC COUNTERMEASURES (ECM) - That division of EW involving
actions taken to prevent or reduce an enemy's efficient use of the electromagnetic
spectrum. (page 1-2, Frame 1).
2.
B.
By a strong, continuous signal.
If jamming is to be effective as an ECM, a jamming transmitter must put out a
strong continuous signal at the same frequency as the signal being jammed. (page
1-6, paragraph 1-10).
3.
A.
Spot and barrage jamming.
The two basic types of jamming transmitters are the barrage jammer and the spot
jammer. (page 1-7, paragraph 1-11).
4.
D.
Sequential multispot jamming.
The sequential multispot method is a variation that uses a single jammer against
multiple frequencies on a time-sharing basis. (page 1-8, paragraph 1-16).
5.
A.
Electric spark.
The spark jamming signal is one of the simplest and easiest produced of all
jamming signals. (page 1-10, paragraph 1-21).
6.
C.
Random-noise jamming.
A random noise jamming signal is effective against most types of radio
communications, and the jamming noise cannot be eliminated without removing the
desired signal. (page 1-11, paragraph 1-24).
SS0652
1-28
Previous Page
