Clear-Com RM-120A Instruction And Service Manual

RM-120A

Speaker

Station

INSTRUCTION

and

SERVICE

MANUAL

I|1

JI

II

Clearm

orm

Intercom

Systems

945

Camelia

St.

Berkeley,

California

94710

510-527-6666

Clear-Com

810031

8/15/88

REV.

C

CLEAR-CON

RM-120A

SPEAKER

STATION

OPERATION

MANUAL

TABLE

OF

CONTENTS

Section

Page

#

I

Introduction

to

the

RM-120A

..................

1

II

Headsets

and

Mics

...........

2

III

Installation

...........

3

IV

operating

Controls

&

Connector:3

...........

4

V

Specifications

...........

7

VI

Parts

Listing

...........

8

Illustrations

Headset

Extension

Cord.

2

RM-120A

Rear

Panel.

3

Daisy-Chain

Interconnection.

3

RM-120A

Front

Panel.

4

RM-120A

Schematics.

9

NOTrcr:

While

Clear-Con

makes

every

attempt

to

maintain

the

accuracy

of

the

information

contained

in

its

product

manualS.

the

information

is

subject

change

without

notice:

DOCUMENTATION

ADDENDUM

4*

RM-120A

MANUAL

*

*4

REV.A

44

at

sNovember

17,

1987

*

4*

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*

4

4*

4*

4t W*

44

4

*t

*J

*

4

41.4

14 $sst

*J ****$**i*

4

X

*

44

.

4

* *

$*s**

MIC

TO

LINE

GAIN

LEVEL

INCREASE

In

effecting

a

4dB

Mic

to

Line

increase

in

gain

level,

the

following

changes

have

been

made:

Change:

At:

To:

100K

OHM

R50,

R51

220K

OHM

1.5K

OHM

R2

3

2.77K

OHM

I.

INTRODUCTION

TO

THE

RM-120A SPEAKER STATION

The

RM-120A

is a

remote

speaker

RM-120A

provides a Call

button

to

station

that

allows

selectable

com-

signal stations

on

the

channel(s)

municating

in

the

Clear-Com

System. chosen with

the

"Channel

Select"

The

operator

can

talk

and

listen

on

toggle

switch. Each channel

has

a

Channel

A,

Channel

B,

or

both

at

lamp

to

indicate

incoming

signals,

once (without

tying them together).

regardless

of the

Channel

Select

switch

position.

The

RM-120A

mounts

in a 19"

rack,

using

just

1.75"

vertical

space.

The

RM-120A

sidetone control allows

It

features a wide frequency

re- the

operator

to

adjust

the

level

of

sponse

speaker

and

operates

with

a

his/her

own

voice

as

heard

in

the

carbon headset

or a dynamic

head-

station's

headset/speaker.

Side-

set/telephone-style handset.

tone

control

helps

to

prevent acou-

stic

feedback

when

using

the

spea-

The

rear panel

provides a 1/4"

jack ker

and

gooseneck

mic

simultaneous-

for

output

to

an

external

speaker

ly.

You

need

only

adjust

sidetone

(using

it

disconnects

the

internal

when

you

set

up the

system

(if at

speaker).

The

operator

can turn

all),

not

when

other stations

join

down

the

volume

of

the

built-in

or

or

leave

the

intercom system.

external

speaker

to

have a private

conversation with a headset.

Al-

The

RM-120A

provides

excellent

ternately,

the

gooseneck

or

headset

speech

intelligibility

in

all

sur-

mic can

be

turned

off

to

use

the

roundings.

It

features

"Automatic

RM-120A

for

"listen-only"

(paging).

Headset

Detection," which

shuts

off

the

mic preamp

when a headset

is

The

RM-120A

provides a balanced

not

plugged

in.

This

prevents

program

input

for

monitoring

exter- noise

pick-up

on

the

intercom

line

nal

audio

in the

speaker

or

head- from

the

unused connector.

The

RM-

set.

The

RM-120A

mixes

the

pro-

120A also

incorporates a mic

limi-

gram with

the

intercom

signal

for

ter,

which

assures

constant

talk

monitoring

in the

headset

and/or

levels and

prevents

overload.

speaker.

The

station

provides

sep-

arate

controls

for

adjusting

inter-

Gooseneck

Mic

Option

com

and

program

volume

levels.

The

RM-120A

is

available

with

a

noise-cancelling

electret mic

on

a

The

"Stage

Announce"

feature

is

for

flexible

gooseneck.

Though

perma-

paging applications.

The

RM-120A

nently

attached,

the

length

of

the

provides a balanced,

line-level

gooseneck

is

field-adjustable.

The

output

signal

to a 1/4"

phone jack

electret

element

has

unusually

high

(on

the

rear

panel). The Stage

immunity

to

ambient

room

noise and

Announce

button

on

the

front

panel speaker

feedback,

thus

permitting

activates

this

output,

giving

the

practical

"hands-free"

operation.

operator

access

to

an

external You

activate

the

mic

by

setting

the

speaker/amp

system.

Pressing

Stage

Mic

On/Off/(On)

switch

to

"(On)"

Announce

mutes

the

operator's

voice

(momentary

on),

which

attenuates

to

the

intercom channels.

the

speaker

by 6 dB

to

reduce

the

possibility

of

feedback.

Visual

Signalling

is a

standard

Clear-Com

feature. The

"Call"

but-

The

RM-120A

provides

two

3-pin,

XLR

ton

attracts

the

attention

of

in-

connectors

for

each

channel

(4

tercom

users

who

have

removed

their

total;

two

inputs,

two

extensions).

headsets

or

turned

off

their

spea-

Standard two-conductor, shielded

kers

(it

can

also

activate

remote

mic

cable

connects

the

RM-120A

to

control

of

KB-112

Stations).

The

the

intercom system.