Massive Audio DB8000 User Manual download pdf (Page 92)

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CIRCLE NO. 25 ON READER SERVICE

PAGE

100

CB

"AUDIO LEVELER"

(Continued from page 58)

Testing and Adjustment.

The Audio

Leveler can be tested and adjusted with

the aid of an oscilloscope, or

by direct

on -the -air transmissions.

If a scope

is employed, it must be

connected as

in Fig. 7 (a demodulator

probe

could

also be used

in

the test

lead between transmitter and scope

if

one

is available.)

With

the

transmitter

turned

on, adjust potentiometer

R9 for

maximum undistorted output

on the

os-

cilloscope

while you talk

into

the

micro-

phone at a

distance of from 6 to 12

inches. If the circuit

has been properly

adjusted,

the signal

level on the

scope

The circuit board

can be mounted externally, or

put

inside

the transmitter

cabinet. It

is

shown

here

installed in

a

Heathkit

Model GW -14 transceiver.

will show

only a

negligible increase

when

you talk

into

the

mike from a closer

distance.

The other

test

method is to

have

an-

other

CB'er

monitor your transmissions

while you

slowly

advance

the setting on

R9.

When

your

monitor detects a de-

terioration

of

speech

quality, back off

slightly

on

the adjustment

until

the

quality

is

restored.

This is

the

proper

setting.

-30

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