Watchman FD-30A - VCO Adjustment Methods; Regular VCO Adjustment; Simple VCO Adjustment

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secon

VCO

Adjustment

Setting:

BAND:

FM

STEREO

A)

Regular

Method

B)

Simple

Method

Procedure:

Procedure:

FM

rf

signal

generator

2.

Turn

RV51

clockwise

or

counterclockwise

and

memorize

the

lighting-up

range

of

the

FM

STEREO

lamp.

o

3.

Secure

RV51

at

the

center

of

the

lighting-up

range

telescopic

of

both

turns

as

shown

below.

antenna

lead

1.

Tune

the

set

to

the

FM

stereo

broadcasting

signal.

Carrier

frequency:

98

MHz

Modulation:

1

kHz,

22.5

kHz

deviation

(30%)

Output

level:

55

dB

(560

nV)

center

of

lighting-up

ranges

lighting-up

range

1.

Unsolder

FM

STEREO

LED

lead

wire.

2.

Tune

the

set

to

98

MHz.

Ns

aes

3.

Adjust

RV51

for

38

kHz

+100

Hz

on

the

frequen-

~—-

RV51

cy

counter.

-—

“=

/

N

—

MPX

board

—

frequency

counter

terminal

7

of

1C51

330

k