LESSON 1
ANSWERS TO PRACTICE EXERCISE
REFERENCE
LEARNING
ANSWER
EVENT
PARAGRAPH
1.
c
TM 11-679 Extract
5, a and b
dB = 10 X log 4/2 = 10 X log 2 = 10 X 0.3010 = 3dB. Even though the
input and output powers changed, the ratio of their change was still
2/1, so the amplifier gain remained 3 dB.
2.
b
TM 11-679 Extract
6, b and table II
Loss indicates that the output level will be smaller than the input
signal. Table II shows that 30 dB is equivalent to a ratio of 1,000
to 1.2 mw 1,000 = 0.002 mw.
3.
b
TM 11-679
8, b
4.
d
1
1, a
5.
a
1
6.
d
1
1, b
7.
c
1
1, b, (2), and (4)
8.
b
1
1, c
9.
a
1
1, e
10.
a
2
11.
c
2
d
12.
b
2
f
13.
b
3
c and example 1
Output in dBm minus input in dBm is gain in dB.
20 dBm - 2 dBm = 18
dB.
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