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(LPF).

The

LPF

was

constructed

with

the

following

specification,

and

components

to

ensure

a

60dB

rolloff

[Ref.

1]:

C

3

=

.01uf,

C

t

=

5C

3

=

.005

uf,

C

2

=

2C

3

=

.02

uf,

R

=

—^—

=

-

16*0

(2

1)

QC,

2000

Ji(.Ol)

v

'

C

3

v

'

The

Fourier

series

and

transform

are

computed

for

the

sampled

signal

and

compared

to

the

RAPIDS

displays.

A-D

conversion

is

accomplished

through

the

use

of

a

printed

circuit

board

constructed

for

the

course

EC2220:

Applied

Electronics.

This

circuit

converts

the

analog

signal

to

a

digital

signal

and

displays

the

quantized

output

on

a

series

of

16

LEDs.

The

student

constructs

the

quantizing

characteristic

plot

by

measuring

the

quantization

step

size.

The

signal

is

converted

back

to

analog

on

the

board

and

compared

to

the

original.

D.

LABORATORY

3:

AMPLITUDE

AND

FREQUENCY

MODULATION

Lab

3

exercises

the

generation

and

detection

of

AM

and

FM

signals.

All

signals

produced

throughout

this

lab

are

analyzed

in

both

the

frequency

and

time

domains.

The

student

begins

by

producing

an

AM

signal

consisting

of

a

single

tone

on

a

carrier.

The

signal

is

analyzed

at

100%,

less

than

100%

and

greater

than

100%

modulation

[Ref.

1].

The

message

signal

is

detected

by

a

student-built

envelope

detector

[Ref.

5].

The

detected

signal

is

compared

to

the

original.

Modulation

indices

are

measured

and

the

effects

on

the

signals

spectra

and

detected

output

are

determined.

Double

sideband

suppressed

carrier

AM

is

then

generated

and

detected

in

the

same

manner.

This

signal

is

then

transmitted

via

a

1.5

MHz

carrier

and

received

on

an

AM

radio.

The

tone

of

the

signal

is

listened

to

at

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 134 135

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