问答题
有一调幅波，其载波功率为100W，试求调幅度m
a
=1与m
a
=0.2时的总功率、载波功率和每一边频的功率。
【正确答案】
(1)m
a
=1
P
T
=(1+0.5m
a
2
)P
c
=(1+0.5×1
2
)×100=150(W)
P
ω
c
+Ω
=P
ω
c
-Ω
=0.25m
a
2
P
c
=0.25×1
2
×100=25(W)
(2)m
a
=0.2
P
T
=(1+0.5m
a
2
)P
c
=(1+0.5×0.2
2
)×100=102(W)
P
ω
c
+Ω
=P
ω
c
-Ω
=0.25m
a
2
P
c
=0.25×0.2
2
×100=1(W)
【答案解析】
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