Wavetek 132 Especificações descarregar pdf (Página 72)

frequencies

we

are

transmitting.

Q:

What

are

these

frequencies?

Sketch

the

impulses.

Once

you

hear

the

tone

on

the

radio,

vary

the

message

frequency

to

hear

the

tone

differences.

Alternate

your

speaker

between

the

input

signal

and

the

detector

output.

Q:

Compare

these

tones

with

that

emitting

from

the

radio.

c)

Construct

the

summer

circuit

used

in

Lab

1.

Using

a

second

Wavetek

132

apply

a

3

kHz

signal

to

one

input

and

apply

the

1

kHz

signal

from

the

original

Wavetek

132

to

the

second

input.

Using

your

positive

speaker

connection

as

a

probe,

listen

to

both

inputs

and

the

output

of

the

summer.

You

should

hear

a

double

tone.

Adjust

the

frequencies

so

the

tones

are

distinct.

On

the

HP8656B,

turn

off

the

RF.

Connect

the

output

of

the

summer

to

the

HP8656B

input

and

transmit

this

signal

to

the

AM

radio.

Q:

Compare

the

tones

heard

on

the

radio

to

the

original.

Part

3:

Frequency

Modulation

a)

Setup

the

configuration

in

Figure

4.

WAVETEK

1M

VCGIN

OUT

OB

oc

OP

WAVETEK

132

OUT

©

TRIG

f

Figure

4

Lab

3

Page

7

62

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