LESSON 2
PRACTICE EXERCISE
ANSWER KEY and FEEDBACK
Item
Correct Answer and Feedback
1.
D.
Operational techniques and systems design.
The two major areas of preventive ECCM are operational
techniques and systems design (page 2-2, para 1).
2.
C
Remedial ECCM
Remedial ECCM are friendly actions taken in response to
enemy jamming (page 2-7, para 1).
3.
B.
Antenna selection
Site selection, radiated power, and antenna selection are
the
most
important
considerations
in
radio
system
installation (page 2-2, para 1b(1)).
4.
C.
Radiotelegraph
Prosigns are normally used with radiotelegraph (page 2-4,
para 3a).
5.
B.
Operate on fixed schedules
Examples of proper radio operator procedure include
operating on a random schedule, encrypting EEFI, and
reducing distinguishable operator procedures. Operating on
a fixed schedule is not an example of proper radio operator
procedure (page 2-3, para 1b(2)(b), and 1b(2)(d)).
6.
A.
Preamble jamming
Preamble jamming involves broadcasting synchronization
tones over the operating frequency of a radio net that uses
voice security devices.
It often causes radios to be
locked in the RECEIVE mode (page 2-9, para 1a(1)(g)).
SS0135
2-18
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