Orban Optimod-fmr 8100a/1 User manual

also

be

used

to

adapt

the

Model

8100A).

This

kit

contains:

QTY

DESCR PT ON

INTRODUCTION:

INSTALLATION:

f

you

have

not

had

much

experience

desoldering

on

double-sided

printed

circuit

cards,

please

read

the

section

entitled

"Replacement

of

Components

on

Printed

Circuit

Cards"

in

Appendix

F

of

the

8100A/1

Operating

Manual.

With

this

Accessory,

the

processing

can

be

easily

adjusted

to

achieve

a

loudness

level

within

0.3dB

of

that

accomplished

by

composite

clipping

(an

inaudible

difference),

while

protecting

the

SCA

region

about

40-50dB

better

that

a

composite

clipper

can.

1

2

1

ACCESSORY

KIT

22

NSTRUCT ON

SHEET

FM

Filter

Card

#0

Prewired

Connector

&

Hardware

Modification

Label

Card

Guide

Registration

Card

nstallation

consists

of

a

slight

modification

of

the

Cards

#8

and

#9

and

installation

of

a

prewired

connector

for

Card

#0.

Even

with

less

than

extremely

aggressive

processing,

the

SCA

region

is

much

more

rigorously

guarded

from

interference

from

the

stereo

subcarrier.

The

FM

Filter

Card

(Card

#0)

replaces

the

safety

clippers

in

the

OPT MOD-FM

Audio

Processor

with

a

pair

of

overshoot-compensated,

low-pass

filters

in

order

to

significantly

reduce

(by

25-30dB)

"splatter"

in

the

SCA

region

of

the

baseband,

as

compared

with

the

"stock"

8100A

or

8100A/1.

t

also

reduces

any

residual

overshoot

by

about

6%.

Card

#0

is

installed

in

the

signal

path

between

the

output

of

the

existing

Cards

#8

and

#9

(filters)

and

the

input

of

Card

#7

(stereo

generator).

The

frequency

response

of

the

Card

is

typically

+0,

-O.ldB,

30-15,

000Hz.

An

8100A/1

containing

this

card

will

therefore

perform

well

within

its

+0.75dB

specification

limit.

Adapts

OPT MOD-FM^

Model

8100A/1

Audio

Processor

to

accept

FM

Filter

Card

#0.

(This

kit

and

instruction

sheet

can

OPT MOD-FM

Model

8100A/1

was

designed

to

meet

all

rules

in

the

now-deleted

FCC

73.322

regarding

crosstalk

between

the

main

channel

and

subchannel.

Higher

performance

than

is

required

by

the

FCC

is

sometimes

desirable

to

fully

protect

SCA

subcarriers

from

interference

caused

by

the

operation

of

the

8100A/l

’

s

safety

clippers

(on

Cards

#8

and

#9)

on

extremely

densely-processed

program

material,

or

simply

to

allow

a

higher

level

of

peak

modulation

without

an

increased

risk

of

overmodulation.

Orban

Associates

Inc.

645

Bryant

Street

San

Francisco,

CA

94107

95296-000-02

7/86

Main:

(415)

957-1063

Sales:

(415)

957-1067

Telex:

17-1480

Card

#0

has

been

specifically

designed

to

be

used

in

conjunction

with

the

8100A/l

’

s

existing

FCS

Overshoot

Corrector.

Card

#0

is

therefore

unusable

with

the

older

OPT MOD-FM

Model

8000A,

or

with

other

manufacturers

’

equipment.

You

will

need:

Allow

about

one

hour.

Procedure:

in

Appendix

C

of

the

8100A/1

Operating

Manual

for

2.

Remove

Cards

#8

and

#9

from

the

8100A/1

chassis.

CAUTION

(J0-T .

2

To

reroute

these

wires,

you

will

need

to

partially

unwind

them

from

the

other

To

preserve

separation

5.

On

the

solder

side

of

the

motherboard,

unsolder

the

BLUE

wire

from

the

solder

fork

for

X

of

the

Card

#8

connector

(J8-X),

then

solder

it

to

N

of

the

Card

#0

connector

(J0-N).

Unsolder

the

GREY

wire

from

the

solder

fork

for

X

of

wires

in

the

harness

and

to

cut

some

cable

ties,

performance,

do

not

bundle

these

two

wires

together.

-OPT MOD-FM

8100A/1

Operating

Manual

-A

5/64"

hex

(Allen)

wrench

for

access

-A

3/16"

flat-blade

screwdriver

for

access

-Small

diagonal

cutters

-Chain-nose

pliers

(or

small

needle-nose)

-A

low-wattage

soldering

iron

with

a

small

tip,

suitable

for

PCB

soldering

work

-Rosin-core

solder

-Flux

removal

solvent

(see

Appendix

F

of

the

8100A/1

Operating

Manual

for

suggestions)

-Cotton

swabs

for

flux

removal

-Spring-actuated

desoldering

tool

#0

connector

(J0-N).

Unsolder

the

GREY

wire

from

the

solder

fork

for

X

of

the

Card

#9

connector

(J9-X),

then

solder

it

to

T

of

the

Card

#0

connector

Watch

for

snags

in

the

internal

wiring

and

for

any

stress

on

the

ceramic

feed-through

capacitors

on

the

divider

wall

or

RF

filter

box.

These

capacitors

are

very

fragile

and

difficult

to

replace.

On

each

card

(they

are

identical),

desolder

one

lead

each

of

diodes

CR805

and

CR806

and

clear

their

pads

of

solder

with

the

desoldering

tool.

Lift

each

diode

so

that

it

’’

hangs

”

in

midair

by

the

lead

that

is

still

attached.

(This

makes

it

easy

to

restore

cards

#8/9

to

’’

stock"

condition

in

the

future

if

desired.)

4.

Align

the

connector

with

slot

0.

Using

the

hardware

supplied,

attach

the

prewired

connector

J0

to

the

rear

rails

(mount

the

connector

on

the

side

of

the

rails

that

the

other

connectors

are

attached

to).

nstall

the

two

card

guides

by

snapping

them

into

existing

holes

in

the

sheet

metal.

3.

Detach

rear

panel

according

to

the

"Access

to

Area

Behind

Rear

Panel"

instructions

in

Appendix

C

of

the

8100A/1

Operating

Manual.

1.

Refer

to

"Routine

Access"

instructions

on

gaining

access

to

cards.

6.

motherboard).

Wire

color

Solder

to

solder

fork

for

From

*Tack-solder

to

(no

fork).

t

nstall

Card

0

in

the

8100A/1

chassis.

7.

8.

9.

AL GNMENT

Required

Equipment:

F*

3

The

Card

#0

connector

is

supplied

with

the

following

wires

attached,

free

ends

of

the

wires

to

the

indicated

points

(located

Do

not

bundle

the

wires

together.

Attach

the

Modification

Label

close

to

the

Serial

Number

Label

on

the

rear

panel

(after

first

cleaning

the

area

with

a

solvent,

such

as

alcohol,

naptha,

or

spot

remover).

Reattach

the

rear

panel

by

reversing

the

disassembly

procedure.

(Refer

again

to

Appendix

C

of

the

OPT MOD

8100A/1

Operating

Manual.)

-Audio

oscillator

-AC

voltmeter

with

better

than

+1%

resolution

(a

DVM

is

ideal)

BLACK

RED

BLACK

YELLOW

WH TE/BLUE

WH TE/GREY

V OLET

WH TE

J0-A

J0-B

J0-C

J0-E

J0-L

J0-R

J0-U

J0-V

I!

The

wire

lengths

have

been

chosen

to

provide

enough

slack

to

enable

other

service

operations

on

the

rear

panel

to

be

performed

in

the

future,

would

be

unwise

to

shorten

the

wires.

t

is

safe

to

tack-solder

to

the

motherboard

with

the

circuit

cards

in

place

except

in

very

high

RF

fields,

in

which

case

all

cards

should

be

removed.

n

any

case,

we

recommend

using

a

soldering

iron

with

a

grounded

tip

to

minimize

possibility

of

circuit

damage.

Avoid

using

excessive

amounts

of

heat

or

flux

at

the

motherboard

(the

connectors

could

be

damaged

by

tempering

of

the

contacts

through

excessive

heat

or

by

creepage

of

flux).

n

addition,

because

some

of

the

motherboard

traces

are

close

together,

inspect

your

work

very

carefully

to

be

sure

that

you

have

not

created

solder

bridges

between

traces

or

pads.

Solder

the

on

the

solder

side

of

the

The

following

procedure

is

performed

for

both

Card

#8

(left

channel)

and

Card

#9

(right

channel).

t

slightly

increases

the

gain

from

the

input

of

each

card

to

its

output.

A

of

Card

#3

connector

(J3-A)

B

of

Card

#3

connector

(J3-B)

C

of

Card

#3

connector

(J3-C)

E

of

Card

#3

connector

(J3-E)

X

of

Card

#8

connector

(J8-X)

X

of

Card

#9

connector

(J9-X)

U

of

Card

#6

connector

(J6-U)*

V

of

Card

#6

connector

(J6-V)*

1.

2.

3.

4.

5.

Do

not

move

the

6.

Replace

all

cards

and

the

subpanel,

close

OPT MOD

is

a

registered

trademark

of

Orban

Associates

nc.

4

installed.

]

(38kHz

NULL)

to

null

the

subcarrier.

TH S

CONCLUDES

SYSTEM

AL GNMENT.

F

‘

the

main

panel,

and

place

the

8100A/1

back

into

service.

Advance

the

output

attenuator

on

the

audio

oscillator

until

the

voltmeter

reads

exactly

1.00

volt

RMS.

Now

move

the

meter

to

the

junction

of

CR805

and

R840,

and

adjust

R841

(Safety

Clipper

Thresh)

until

the

meter

reads

exactly

1.00V

RMS

(it

will

typically

read

approximately

0.94V

RMS

before

the

adjustment

is

made).

Connect

the

oscillator

to

the

LEFT

NPUT

of

the

8100A/1.

Place

Card

#8

in

the

extender

(you

may

do

this

while

the

unit

is

powered

up

without

causing

damage).

Connect

the

AC

voltmeter

to

the

junction

of

R823

and

R825

on

Card

#8.

Connect

its

ground

to

the

side

of

R826

pointing

towards

the

three

upper

inductors,

or

any

other

convenient

circuit

ground

on

the

card.

Set

the

oscillator

to

400Hz,

and

turn

its

output

level

all

the

way

down.

Make

sure

that

the

reading

on

the

voltmeter

is

less

than

0.01V

(if

it

isn

’

t,

you

are

probably

picking

up

hum;

eliminate

any

such

hum

before

making

the

following

adjustment).

nsert

the

extender

board

into

slot

#8.

Apply

power

to

the

8100A/1.

Place

both

PROOF/OPERATE

switches

in

PROOF

and

let

the

gain

settle

for

at

least

2

minutes.

f

Cards

#8

and

#9

have

not

already

been

removed

from

their

slots,

remove

them.

The

new

Card

#0

contains

servos

to

ensure

that

the

DC

offset

at

its

outputs

is

less

than

2mV.

Therefore,

the

DC

offset

between

the

left

and

right

channels

at

the

input

of

the

Stereo

Generator

may

change

when

Card

#0

is

installed.

We

recommend

measuring

38kHz

subcarrier

suppression

on

your

stereo

monitor

after

Card

#0

is

f

the

suppression

is

poorer

than

-50dB,

extend

Card

#7

and

adjust

R714

Remove

the

card

and

extender

from

slot

#8,

and

re-install

Cards

#8

and

#9

in

their

correct

slots.

Remove

Card

#8

from

the

extender

and

replace

it

with

Card

#9.

extender

from

slot

#8.

Then

adjust

Card

#9

using

the

same

procedure

(steps

3

and

4)

that

you

followed

in

adjusting

Card

#8.

38kHz

NULL:

Any

DC

offset

between

the

left

and

right

inputs

of

the

Stereo

Generator

will

unbalance

the

doubly-balanced

modulator

which

generates

the

stereo

subchannel,

unsuppressing

the

38kHz

subcarrier.

Cards

#8

and

#9

can

each

exhibit

as

much

as

30mV

DC

offset;

appropriate

adjustment

of

the

Stereo

Generator

’

s

38kHz

NULL

trimmer

(R714

on

Card

#7)

compensates

for

this

offset.

[You

have

just

adjusted

the

card

so

that

the

new

Card

#0

sees

exactly

the

same

level

as

the

overshoot

compensation

clipper

(CR803,

CR804)

on

Card

#8

did.]

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Orban OPTIMOD-FMR 8100A/1 User manual

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