Wavetek 132 Spezifikationen PDF herunterladen (Seite 83)

Q:

What

effect

does

the

modualtion

index

have

on

the

spectra

of

each

signal?

A:

Increasing

the

modulation

increases

the

sideband

amplitudes

and

decreases

the

carrier

amplitude.

If)

Q:

You

will

have

to

adjust

the

plot

scale

for

the

detected

signal

(channel

C),

why?

A:

Power

is

decreased

during

modulation.

The

power

of

the

carrier

and

the

sidebands

are:

Carrier

Power

=

—

A*

2

c

Sideband

Power

=

—

k

A*

8

a

c

Q:

At

what

modualtion

index

does

DSBSC

occur?

A:

k

a

=

(l+l)/(l-l)

=

co

Q:

What

are

the

time

and

frequency

representations

of

the

DSBSCsignal?

A:

x(t)

=

A

sin

2%ft

*

A

sin

2ir/

t

y

'

c

•>c

m

J

m

x(t)

=

.25

(cos

27119000

t

-

cos

2%

21000

t)

Lab

3

Solutions

Page

3

73

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