Universal Audio LA-3A Manual de usuario

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lliJ@D

INSTRUCTION

MANUAL

LEVELING

AMPLIFIER

MODEL

lA-3A

products

UNITED

RECORDING

ELECTRONICS

INDUSTRIES

11922 VALERIO STREET,

HOLLYWOOD

CALIFORNIA

91605

TEL. (213) 764-1500

••

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INSTRUCTION

MANUAL

LEVELING

AMPLIFIER

MODEL

l.A-3A

Manufactured

USA

UNITED

Recording

Electronics

INDUSTRIES

11922

Valerio

Street

North

Hollywood,

California

91605

www.SteamPoweredRadio.Com

TELETRONIX

MODEL

LA-3A

LEVELING

AMPLIFIER

INTROIXJCTION

The

Teletronix

Leveling

Amplifier

will

automatically

reduce

audio

peaks

which

might

otherwise

over

drive

broadcast

re~ording

e~ip-

men

Automatic

gain

reduction

accomplished

the

use

electro-

optical

voriabl~

attenuator,

which

placed

ahead

the

first

ampli-

fier

stage.

The

attenuation

controlled

the

amplitude

the

lA-3A

input

signal

This

~ystem

permits

instantaneous

gain

red~ction,

yet

causes

significant

wave

form

harmoni~

distortion,

TJ'le

amplifier

provides

suffi~ient

gain

and

output

level

(+24

dBm

nominal)

used

line

program

amplifier,

for

direct

connection

the

transmitter

the

case

radio

operation.

Provi~ions

are

made

for

interconnection

two

lA-3A

Limiters

provide

equal

gain

reduction

both

channels.

Gain

Reduction

Distortion

Respon~e

Noise

SPECIFICATIONS

Less

than

0.35

tqtal

harmonics

+24

dBm

0oS

dB,

kHz

below

program

level

threshold

limiting

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Gain

Output

Level

Input

Level

Attac~

Time

Release

Time

10.

Input

Impedance

11.

Output

Impedance

12.

Output

Source

Impedance

13.

Panel

Size

14.

Depth

Behind

Panel

15.

Panel

Controls

16.

Meter

17.

Power

Requirements

18.

fuse

+ 1

dB,

1 dB

selected

switch

bac¾

Limiter

+20

dBm

nominal;

+27

dBm

max.

peaks

dBm

max.

~ith

dBm

gain

setting

+20

dBm

max.

with

gain

~etting

1.5

less

depending

de~ree

limiting

Approximately

0.06

seconds

f0r

release;

0.5

seconds

for

complete

release

dep,nding

~pon

amount

r~quction

600

ohms

floating

600

oh~s

float\ng

Appro~imqtely

ohms

One-hqlf

rack

9.25

inche!:i

Gain

(input

ley~l),

fea~

Reductio~,

Meter

Selector

Switch,

and

Power

S"1itch

Gain

R~duction

and

Output

read

dBm

output

115/230

v9lts

50-60

cycle

W?tts

3AG,

1/8

AMP

Slow

Blow

for

115V;

3AG

1/16

AMP

Slow

Blow

for

230V

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INSTALLATION

Line

Voltage

SWitch

The

LA-3a

set

for

power

line

voltage

115V

~hen

~hipped.

order

change

this

for

230

volts,

Hz,

slide

the

power

source

sel,ctor

switch

the

rear

the

unit

the

230

volts

~os~lipn.

s~all

screw

driver

should

used

operate

th+s

switch~

19"

RACK

MOUNTING

(Single

Unit)

I ,

The

following

parts

are

furnished

the

~R-3A

kit

for

mounting

one

LA-3A

standard

19"

USASI

rack:

Rack

Adapter

Angles

UREI

Part

#2fJ-lJ179

Rack

Extensions

UREI

Part

#25-11176

6-32

Oval

Head

Screws

(black)

4 No.

Lock

Wasners

6-32

Nuts

8-32

Pan

Head

Screws

4 No.

Lock

Washers

Installation

Procedure

Mount

angles

back

side

rack

extensions

using

black

6-~2

screws,

lock

washers,

and

nuts.

not

tighten

screws

thip

ti.me.

Mount

angle

and

rack

extension

assemblies

the

tapped

holes

the

sides

the

1A-3A,

using

8-32

screws

with

lock

washers.

not

tighten

the

screws

this

ti~e~

The

LA-3A

package

adjustable

allow

optimum

C!llignment

the

front

panel

with

the

rack

extensions.

effect

precise

alignment,

loosen

the

front

panel

mounting

screws

and

the

top

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and

bottom

cover

mounting

screws

about

1/2

turn.

Adjust

rela-

tive

positions

brackets

and

panels.

Tighten

all

hardware.

RACK

K::>UNTING

(

Two

Uni

ts)

The

following

parts

are

furnished

the

DR-3A

kit

for

mounting

two

I.A-3A

units

side

standard

USASI

rack:

Joining

Plates

UREI

Part

#25-11168

Rack

Mounting

Angles

UREI

Part

#25-11162

Spacer

Plates

UREI

Part

#25-1116

8-32

Pan

Head

Screws

No.

Lock

Washers

Installation

Procedure

Place

units

side

side,

with

front

panels

touching.

Remove

proper

screws

top

each

unit

allow

joining

plate

laid

place.

Replace

screws

through

plate

and

covers.

not

tighten

screws

completely

this

time.

Turn

assembly

upside

down

and

install

other

joining

plate

(1)

above.

Mount

one

angle

and

one

spacer

plate

each

side

the

l.A-3A,

using

the

8-32

screws

and

lock

washers.

The

mounting

holes

the

LA-3A

are

tapped,

and

nuts

are

required.

The

spacer

plates

should

located

between

the

angles

and

the

l.A-3A

chassis.

not

tighten

the

screws

this

time.

The

I.A-3A

package

adjustable

allow

optimum

qlignment

the

front

panels

and

rack

mounting

angles.

effect

precise

alignment,

loosen

the

front

panel

mounting

s~rews

and

the

top

and

bottom

cover

mounting

screws

about

1/2

turn.

Adjust

rela-

tive

positions

brackets

and

panels.

Tighten

all

hardware.

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CIRCUIT DESCRIPTION

The

I.A-3A

Leveling

Amplifier

will

produce

essentially

instantaneous

gain

reduction

over

with

increase

harmonic

distortion.

typical

gain

reduction

curve

for

this

system

illustrated

Fig~re

Compressor

action

occurs

from

the

breakaway

point

-~O

input

and

-20

dB,

which

point

the

curve

b~comes

ho~izontal

exhibit

limiting

action.

The

input

increases

additional

dB,

but

the

output

increases

less

than

dB.

The

leveling

amplifier

thus

com-

bines

the

characteristics

compressor

and

limiter.

reasonable

amount

care

gain

riding

will

restrict

normal

operation

the

compression

region,

but

uncontrolled

output

levels

will

prevented

the

limited

action.

The

heart

the

leveling

amplifier

the

electro-opticql

attenu-

ator

which

placed

ahead

the

first

amplifier

stage.

The

actual

stage

gains

and

operating

parameters

are

not

varied,

permitting

the

amplifier

operate

optimum

conditions

regardless

the

amount

gain

reduction.

The

optical

attenuator

consists

photo-conductive

cells,

opti-

cally

coupled

electro-luminescent

light

source.

The

electro-

luminescent

device

provides

light

intensity

which

proportional

the

audio

voltage

applied

its

terminals.

Not

unlike

capacitor

construction,

the

electro-luminescent

lamp

consists

plate

glass

plastic

coated

with

clear

conducting

material

one

side

and

thin

layer

phosphor

the

other

side.

metallic

plate

contact$

the

phosphor

coating.

alternating

current

applied

the

con-

ducting

plates

the

phosphors

are

excited

the

voltage

across

the

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dielectric

and

light

produced.

The

amount

light

depends

upon

the

applied

voltage

and

frequency.

The

gain

level

controlling

element

the

photo-conductive

cells.

The

resistance

the

cells

decreases

with

increase

the

impinging

light.

Since

the

light

produced

directly

from

the

audio

voltage,

the

response

instantaneous.

Re~ti~

fication

and

filtering

the

audio

produce

control

signal

are

npt

necessary

the

case

conventional

limiters.

This

system

re~ults

automatic

level

control

whose

speed

operation

limited

only

the

response

the

variable

resistance

photo

cells

used.

Cells

are

selected

which

provide

minimum

attack

time,

and

release

time

which

requires

about

milliseconds

for

50%

release,

and

then

gradual

release

over

period

seconds

the

point

com-

plete

release.

Referring

Figure

the

functional

block

diagram,

the

input

signal

applied

directly

the

optical

attenuator

from

the

high

im~

pedance

winding

the

input

transformer.

The

amount

attenuation

introduced

the

optical

attenuator

controlled

the

audio

voltage

applied

the

lamp-driver

amplifier.

The

amount

signal

applied

the

voltage

amplifier

also

controlled

the

manual

gain

control.

The

voltage

amplifier

stage

provides

gain

dB.

Over-

all

amplifier

feedback

approximately

provides

low

distortion,

flat

response,

and

gain

stability.

For

stereo

applications,

the

gain

reduction

voltage

amplifier

one

unit

may

coupled

another

unit.

The

output

each

voltage

amplifier

stage

applied

the

stereo

balance

control

and

also

brought

out

terminal

the

chassis.

For

stereo

operation,

this

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terminal

connected

the

same

terminal

identical

amplifier

and

control

voltage

becomes

common

both

units.

gain-reduction

control

voltage

generated

either

amplifier

will

cause

equal

gain

reduction

both

units.

The

control

voltage

applied

through

the

stereo

balance

control

the

lamp-driver

amplifier.

This

stage

pro-

vides

the

necessary

voltage

operate

the

electro-luminescent

light

source.

OPERATION

The

LA-3A

Leveling

Amplifier

designed

prevent

increase

output

level

beyond

pre-determined

point,

and

due

its

unique

design,

functions

combined

compressor

and

limiter.

The

effect

illustrated

Figure

The

point

which

the

compressed

curve

breaks

away

from

the

straight

"No-Gain

Reduction"

line

determined

the

setting

the

"Peak

Reduction"

control.

can

seen

from

the

curve

that

compression

occurs

and

gradually

increases

over

the

first

input

level

rise.

The

slope

the

curve

then

becomes

horizontal,

preventing

increase

output

level

regardless

input

increase.

Control

Settings

recommended

that

the

"Peak

Reduction"

control

set

prevent

increase

output

level

beyond

the

100

modulation

point.

This

setting

should

made

typical

program

material.

Settings

the

"Gain"

and

"Peak

Reduction"

controls

are

independ-

ent.

However,

the

"Gain"

control

should

set

provide

sufficient

output

after

the

"Peak

Reduction"

control

has

been

adjusted.

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The "Peak

Reduction"

control

should

set

for

the

desired

amount

gain

reduction

indicated

the

meter.

Continuous

extreme

re-

duction,

such

dB,

does

tend

reduce

the

dynamic

range

music.

Maximum

benefit

obtained

running

8 dB

compression

continuously.

For

ease

control

and

prevent

overload

the

input

trans-

former,

switchable

pad

included

ahead

the

LA-3A

input

trans-

former.

the

high

gain

(50

dB)

position

the

pad

switched

out.

When

the

device

used

input

levels

greater

than

dBm

the

pad

should

switched

using

the

position

the

rear

panel

mounted

gain

switch.

Meter

The

Meter

serves

two

functions:

indicates

output

level

well

gain

reduction

directly

dB.

When

the

meter

selector

switch

placed

the

"output"

position,

the

meter

will

indicate

output

level

across

the

600

ohm

terminals.

The

meter

calibrated

read

100%

when

the

amplifier

output

+4 dBm.

The

position

marked

"Gain

Reduction"

permits

the

meter

indicate

the

amount

gain

reduction

peak

limiting

directly

dB.

During

periods

gain

reduction

the

pointer

will

return

the

meter

scale.

The

pointer

initially

set

this

position

means

the

screw

driver

adjusted

control

located

near

the

lower

right

hand

corner

the

meter.

Stereo

two

LA-3A

Leveling

Amplifiers

are

used

tandem

for

stereo,

the

gain

reduction

each

amplifier

can

made

equal,

regard-

less

which

channel

instigating

the

limiting.

This

accomplished

Page

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