Wavetek 132 Spezifikationen PDF herunterladen (Seite 71)

b)

Split

the

input

to

the

Wavetek

186

so

the

signal

off

the

Wavetek

132

also

goes

to

the

HP8656B

signal

generator

input,

you

will

directly

modulate

this

signal

onto

a

1.5

MHz

carrier.

Connect

the

RF

out

of

the

HP8656B

to

the

HP461A

amplifier

input.

Set

the

amplifier

on

20dB.

Connect

the

output

of

the

amplifier

to

the

antenna.

Plug

in

the

radio.

Verify

your

setup

with

Figure

3.

Note

that

we

are

modulating

our

sine

wave

onto

the

20

kHz

carrier

at

the

Wavetek

186

and

separately

modulating

it

onto

a

1.5

MHz

carrier

at

the

HP8656B

for

comparison

purposes.

WAVKTEK1M

VCA

IN

OUT

ft

HD

1

C

<£

3)

Figure

3

The

front

of

the

HP8656B

has

3

key

pads

marked

modulation,

carrier

and

data.

On

the

modulation

pad,

press

FM,

press

OFF,

and

then

press

AM.

Using

the

up/down

arrow

keys

below

the

AM

button,

adjust

the

modulation

to

20%.

On

the

carrier

pad

press

FREQ.

Using

the

data

pad

type

in

1.5

Mhz.

Press

RF

ON.

The

display

on

the

far

right

should

read

-7.0

dB.

If

it

does

not,

press

AMPTD

on

carrier

pad

and

adjust

it

by

using

the

up/down

arrow

keys

below

the

AMPTD

button.

Tune

the

AM

radio

to

pick

up

the

Lab

3

Page

6

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