Clear-Com RM-120A Service Manual download pdf (Page 6)

III.

RN-120A

INSTALLATION

The

RM-120A

connects

to

the

intercom

system

via

two

pairs

of

3-pin,

XLR

0

connectors

on

the

rear

panel.

1)

Route

each

channel

on

a

separate,

two-conductor,

shielded

mic

cable

(e.g.

Belden

8413)

from

the

Main

Station

intercom

output

connectors

to

the

rack

location

of

the

RM-120A.

2)

Rack-mount

the

RM-120A

and

then

apply

the

intercom

inputs

to

the

appro-

priately

labelled

(Channel

A

or

Channel

B)

3-pin

female

connectors

(on

the

rear

panel).

The

3-pin

male

connectors

provide

a

hard-wired

loop-through

for

each

channel,

which

allows

extension

("daisy-chaining")

of

the

intercom

lines

to

other

stations

in

the

system.

The

pin

assignments

for

all

intercom

connectors

are:

Pin

1:

Common

Pin

2:

+30

VDC

Pin

3:

Intercom

Audio

CHASSIS

OEPTH

Ch.

A

or

B

6.62'

S7vl3

t t 1 t A g

eor(Om.

3)

Program

Input:

the

RM-120A

rear

panel

contains

a

3-pin

female

connec-

tor

for

input

of

a

balanced,

line-level

auxiliary

input.

Pin

1 is

ground,

and

Pins

2

and

3

are

hot.

The

program

input

is

transformer-coupled;

it

will

also

accept

an

un-

balanced

input

if

you

ground

either

of

the

hot

leads.

A 0

dB

signal

will

drive

the

headset/speaker

to

full

output.

The

impedance

of

the

program

input

is

l0k

ohms

bridging.

The

program

audio

mixes

with

the

intercom

audio

(in

the

station's

headset

and

speaker

outputs

only),

and

the

listen-levels

of

each

are

adjustable

via

the

RM-120A

front

panel

controls.

4)

Stage

Announce

connection

from

rear panel:

output

to

speaker/amp

paging

system

(600

ohms

impedance);

ring/tip/sleeve

connections.

RM-120A

RM-120A

RM-120A

&

ii

ORB

I

Lig

I |

ARB

QE3

|

CH.

A

|

CH,

B>IIIPT

I

XESO

INTERCOM

OUTPUT

STANDARD

2-COND.

FROM

MAIN

STATION

SHIELDED

MIC

CABLE

DAISY-CHAIN

INTERCONNECTION

3

1 2 3 4 5 6 7 8 9 10 11 12

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