Clear-Com PM-220 Instruction And Service Manual

RM-220

2-CHANNEL REMOTE STATION

INSTRUCTION

and

SERVICE MANUAL

Clear-

COlli

Intercom Systems

945 Camelia st. Berkeley, California 94710 510-527-6666

Clear-Com 810193

8/24194

REV

. A

Clear-Com Systems

RM

-220 2-Channel Remote Station

Instruction Manual

PIN 810193

(C) 1990 Clear-Com Systems
All

Rights Reserved

Clear-Com Systems
945 Camelia

St.

Berkeley,

Ca.

94710

U.S.A

While Clear-Com makes every attempt to maintain the accuracy

of

the information

contained in its

product

manuals, that information

is

subject to

change

without

notice.

3

RM-220 2 Channel Remote Station

CLEAR-COM LIMITED WARRANTY

Clear-Com products are warranted to

be

free from defects

in

materials

and

workmanship

for a period

of

one

year

from the date

of

sale.

Clear-Com's sole obligation during the warranty period

is

to provide, without

charge, the parts

and

labor necessary to remedy covered defects appearing

in

products returned prepaid to Clear-Com, 945 Camelia St., Berkeley,

Ca.

94710-1484, U.S.A.

This warranty does

not

cover any defect, malfunction

or

failure

caused

beyond

the control

of

Clear-Com, including unreasonable

or

negligent operation,
abuse, accident, failure to follow instructions in the Manual, defective or im­proper

associated equipment, attempts at modification

and

repair

not

autho-

rized

by

Clear-Com,

and

shipping damage. Products with their serial numbers

removed

or

defaced are not covered

by

this warranty.

To

obtain warranty service, follow

the

procedures described

below

in

IIProced-

ures for Returns

ll

and

IIShipping

to

Manufacturer for Repair

or

Adjustment.

1I

This warranty is the sole

and

exclusive express warranty given with respect to

Clear-Com products.

It

is the responsibility

of

the

user

to determine before pur-

chase that this product is suitable for

the

user's intended purpose.

Any

and

all implied warranties, including the implied warranty

of

merchantability are limited to the duration

of

this express limited warranty.

Neither Clear-Com

nor

the dealer

who

sells Clear-Com products is liable for

incidental

or

consequential damages

of

any kind.

Return Shipping Instructions

Procedures for returns:

-If

repair

is

necessary, contact the dealer

where

the unit

was

purchased.

-If

repair through the dealer is not possible, contact the Clear-Com Custom-

er

Service Department, located at the factory, as directed below.

They

will is-

sue

a Return Authorization Number eRMA).

-Do

not

return

any

equipment to the factory without first obtaining a Return

Authorization Number.

©

Clear-Com Intercom Systems 1994

Rev. A

4

RM-220 2 Channel Remote Station

-Be

prepared

to provide your

companys

name, address,

phone

number,

name

of

person

to contact regarding the repair, type

and

quantity

of

the

equipment, description

of

the defect,

and

the

equipment

serial number(s).

Questions regarding returns for repair should

be

directed to:

Customer

Service

Department

Clear-Com

Intercom

Systems
945 Camelia Street
Berkeley, California 94710-1484
Telephone:

[phone]

Fax: [phone]

Shipping to Manufacturer for Repair

or

Adjusbnent

All

shipments

of

Clear-Com equipment must be

prepaid

via United Parcel Ser-

vice

or

the

best available shipper. The

equipment

should

be

shipped

in

the

original packing container; however,

if

the original container is

not

available,

use

a suitable container that is rigid

and

of

adequate

size.

If

a substitute con-

tainer is used, the equipment should

be

wrapped

in

paper

and

surrounded

with

at

least four inches

of

excelsior

or

similar shock-absorbing material. A de-

tailed description

of

the

problem

or

work

to

be

done

should

be

included.

All

shipments should

be

directed to

the

attention

of

the Customer Service Depart-

ment

and

must include the Return Authorization Number.

Upon

completion

of

repairs, equipment will

be

returned collect via United Par-

cel Service

or

other specified shipper.

NOTICE

ABOUT

SPECIFICATIONS

Performance specifications included in this manual are deSign-center specifica­tions

and

are included for customer guidance

and

to

facilitate system installa-

tion. Actual operating performance may vary.

BEFORE YOU BEGIN .

..

To

get

the

most

out

of

the

RM-220

Main Station, read this manual carefully.

It

will

answer

questions

you

might have

about

the

operation

and

service

of

the

components in the system. Included

is

a Troubleshooting Section that provides

causes

and

possible solutions to problems

you

might

have

with system

and

component

operation. Clear-Com's Customer Service

Department

is available

to

answer questions

not

covered in this manual.

Rev. A

©

Clear-Com Intercom Systems1994

5

RM-220 2 Channel Remote Station

THE CLEAR-COM CONCEPT

Clear-Com

is

a closed-circuit intercom system that consistently provides high­clarity communication in high-noise and low-noise environments. A basic sys­tem consists

of

a single- or multi-channel

power

supply

or

main station con-

nected to various single-

or

multi-channel remote stations,

such

as beltpacks

and

loudspeaker stations.

Clear-Com manufacrures a wide variety

of

both portable

and

fixed-installation

units.

All

are compatible with

each

other. Clear-Com intercom systems

can

also interface with

?ther

communication systems

and

devices.

Clear-Com stations are interconnected with two-conductor, shielded micro­phone

cable, using 3-pin

XLR

connectors.

One

wire carries

the

DC

power

(28-30 volts) from a main station or power supply to all remote stations,

and

the

other wire carries 2-way (duplex) audio information. The shield acts as a

common

ground.

One

termination

(per

channel)

is

needed

throughout the in-

tercom network,

and

is

usually located

in

the

main station or

power

supply.

Clear-Com

is

a distributed amplifier system; each main

and

remote

station

houses its

own

mic preampliller, headset

or

speaker

power

amplifier,

and

signaling drcuitry. Low-impedance mic input lines (200 Ohms)

and

specially

designed circuitry make Clear-Com channels virrually immune to

RFI

and dim-

mer

noise.

Clear-Com main stations, power supplies

and

certain remote stations

each

have

an

auxiliary program input with its

own

volume control, which allows

an

exter-

nal audio source to

be

fed to the intercom system.

Visual Signal Circuitry

(CALL

Lights), a standard fearure

on

most main

and

re-

mote stations, allows the user to attract the attention

of

operators

who

have re-

moved their headsets.
Depending

upon

the type

of

main

and

remote stations selected

and

assuming

that

enough

DC

power

is

available, a maximum

number

of

remote stations

from

10

(all speaker stations) to 30 (all headset stations)

can

be

distributed

along a mile

of

wire. Remote stations bridge the intercom line

at

a very high

impedance (>10 KOhms), and place a minimum load

on

the line.

The

audio

level always remains constant, and does not flucruate

as

stations leave

and

join

the

network.

© Clear-Com Intercom Systems 1994

Rev. A

6

RM-220 2 Channel Remote Station

DESCRIPTION

The

"PL-Pro"

RM-220

is

one

of

a series

of

professional intercom stations specifi-

cally designed for the broadcast industry. This 2 channel,

one

rack

space

sta-

tion

is

ideal for

ENG

and

EFP

trucks, production studio consoles,

and

small

TV

facilities. The station can

be

tailored

to

your

needs through it's programmable

"Talk"

button options. The

RM-220

is

compatible with all Clear-Com Party-Line

intercoms,
The station also incorporates a single channel program interrupt system (lFB)

in

the

station. When activated,

one

or

more stations

can

interrupt

the

program

to a talent with Clear-Con's wired

or

wireless talent receivers. Direct connec-

tion

to

Clear-Corn's

IFB

system

is

easily accomplished through a 1/4 inch

phone

jack

on

the rear panel intended to directly connect

to

a Clear-Com

MA-4.

The

RM-220

remote

speaker/

headset station allows selectable two channel

talking

and/or

listening

on

a Clear-Com Intercom System.

The

operator can

communicate

on

either

of

the channels separately

or

on

both

at once. Illumi-

nated dual action talk buttons are electronic momentary

or

latching.

The

latch-

ing feature may

be

disabled if desired. Also the talk buttons can

be

remote

controlled for footswitch

or

other use. Monitoring activity

is

possible through

the

speaker

or

headset

or

both at once.

The

RM-220

features Visual

Call

Signaling to attract the attention

of

operators

who

have removed their headsets

or

turned off their speakers.

This station accepts dynamic headsets. The station accepts two different
lengths

of

plug-in gooseneck microphones,

9"

and

18",

to

allow for different

operating locations/positions.

The station's speaker can

be

turned

on

or

off

by

a convenient front

panel

switch

when

private conversation via the headset

is

desired. A "speaker dip-

ping" circuit will give you

an

additional amount

of

acoustic output before feed-

back. This feature helps

to

reduce feedback

when

stations are placed

in

close

proximity

to

each other. The station accepts a balanced Program

input

for

mOnitoring external audio in the headset

or

speaker. Individual sidetone con-

trols for

each

channel allows the operator

to

vary the level

of

his/her

own

voice as heard in the headset/speaker.

Rev. A @ Clear-Com Intercom Systems1994

7

RM-220 2 Channel Remote Station

"Studio Announce" allows control

of

a paging

speaker

in

a studio. A front

pan-

el

button

activates this function

and

an

assodated

relay.

The

RM-220

installs

in

a standard

19"

equipment

rack, using

only

one

rack

space. The

station provides

two

3-pin,

XLR

connectors for

Input

and

loop-

through

on

each

channel.

TECHNICAL SPECIFICATIONS:

CONTROL SYSTEM:

CMOS Digital Logic

and

Signal Switching

HEADSET MICROPHONE PRE-AMP:

Dynamic Headset Input

Impedance

---

- 1 KOhms

Input Level - 55

dBv*

nominal

Frequency Response: 250 Hz

to

12 KHz,

contoured

for intelligibility.

Gain from Headset

to

Intercom Line:

--

+41

dB

PANEL MICROPHONE PRE-AMP:

Input

Level

------------

45

dBv*

nominal

Frequency Response: 250 Hz

to

12 KHz,

contoured

for intelligibility.

Gain from Panel

Mic

to

Intercom

Line:

--

+31

dB (adjustable)

SPEAKER AMPLIFIER:

Load Impedance:

----------

16

Ohms

Output

Level: at least 4 watts

Distortion:

<0.2%

THD at 1 KHz

Frequency Response: 200-18KHz +/-2dB

HEADPHONE AMPLIFIER:

Load Impedance:

----------

greater

than

50

Ohms

Output

Level: at least +20

dBv*

across 600

ohm

Distortion:

------------

<0.2% THD

at

1 KHz
Frequency Response: 200-18KHz +/-2dB
Gain from Intercom Line: +37 dB

PROGRAM INPUT:

Input

Level

Ref.:

----------

-10

dBv*

Input

Impedance

: >40 KOhms

Frequency Response: 150 Hz to 15 KHz

© Clear-Com Intercom Systems 1994

Rev. A

8

RM-220 2 Channel Remote Station

INTERCOM LINE DRIVE/RECEIVE CIRCUITS:

Impedance, Output Load:

------

> 10 KOhms (200Hz - 10 KHz)

Level, Line (200

ohm

load): -9

dBv*

(nominal) +5dBv (max

before clip)

Sidetone Null Capability:

-------

>

25

dB (200Hz - 10 KHz)
Crosstalk, Station Induced Ch. to Ch.: >60 dB
Noise,

SN

Ratio

in

Listen Channels: >60 dB

LINE LEVEL OUTPUTS:

SA

(Announce)

Type

Balanced

Impedance

---

-~---

~

600

ohms

Level 0 dBv

IFB/HOT

MIC:

Type

--------

--

---------

Unba~nced

Impedance

---------

600

ohms

Level 0 dBv

STANDARD CLEAR-COM SYSTEM SPECIFICATIONS:

Usable Line Quality:

--------

> 100 Stations

Total Line Length

on

One

Channel > 5000 feet

CONNECTORS:

Intercom:

----

--

------

4

XLR-3

(2-CH

A,

2-CH B)

Accessory DB-15F

Program Input
SA

output

Foot Switch Logic Inputs

IFB/HOT

MIC.

--

---

-----1/4

inch

Phone

Jack

POWER REQUIREMENTS:

Source Intercom Line
Voltage

------------

20

- 30

VDC

Current 65

rnA

idle, 120

rnA

average

PHYSICAL SPECIFICATIONS:

Dimensions:

-------------

19"W x 1.75"H x 7 ..0D

(483mm x 44.5mm x 178mm)

Weight:

------------

3.6 lbs 0 .6 Kg)

Operating Temperature Range: 32-122° F

CO-50°

C)

• -

OdBv

= 0.775 volts

RMS.

(Specifications subject to change without notice.)

Rev. A

© Clear-Com Intercom Systems1994 .

9

RM-220 2 Channel Remote Station

INSTALLATION

This section discusses the installation

of

the

RM-220

in

an

intercom system.

Typical applications, overall installation theory,

and

detail

of

each

connector,

and

adjustment

of

the

RM-220

are discussed.

INSTALLATION OVERVIEW

This section describes the Clear-Com concept in intercom line interconnection.
The

following subjects are discussed:

• Intercom Line Connection

• Line Termination

• Station Powering

• Cable Considerations

Intercom Line Connection:

The

RM-220

provides a male

and

female

XLR-3

connector for

each

intercom

line that

are

"looped through".

Line Termination:

The

fundamental concept

of

Clear-Com Party-Line intercom is that all stations

provide high impedance current sourced signals into a single

common

system

termination.

The

line drivers in a station have a source

impedance

greater

than

10 KOhms.

The

receive

or

"listen" section

of

stations contain a 'hybrid null' circuit that at-

tempts

to

reject (null) any "talk" signal being sent

by

that station

on

that chan-

nel.

The

'hybrid null' circuit

depends

on a known

impedance

on

the

intercom

line

to

accomplish this. Variations in impedance

on

the

line

upset

the

'null'.

CAUTION:

All

Clear-Com Intercom lines must

be

terminated.

Care

must

be

taken

not

to

fail

to

terminate

or

to

'double' terminate a line.

All

unused

in-

tercom inputs must

be

terminated to

keep

the

line drive circuits stable.

The

RM-220

does

not

provide termination

on

the intercom line. Clear-Com

main stations

and

power

supplies provide switch selectable termination net-

works

on

all intercom

output

lines. It

is

up

to

the

user

to

determine

where

the

termination will

be

provided.

An

unterminated line will cause excessive levels,

possible oscillation

of

line drivers,

and

sever unbalance

of

hybrid null net-

works. A

double

or

multiple terminated line will cause

low

levels

and

sever

unbalance

of

hybrid null circuits.

©

Clear-Com Intercom Systems 1994

Rev. A

10

RM-220 2 Channel Remote Station

The

termination

of

an

intercom line (or channel) is a 220

Ohm

resistor in series

with a 4.7 KOhm that

is

paralleled with a

10

uF capacitor.

Station Powering:

The

RM-220

needs +20 to

+30

volts between pins 1

and 2 of

the intercom con-

nectors. Typical Clear-Com systems are powered

by

a Main Station

or

a Power

Supply.
Clear-Com

power

supplies can

be

paralleled to increase the

number

of

RE-

MOTE

STATIONS

that can

be

operated in a system.

Cable Considerations:

The

Clear-Com intercom line

is

intended to run

on

a shielded twisted pair

of

cable

per

channel

of

intercom.

One

conductor carries full duplex ("two-way")

audio, the

other

conductor carries the

DC

power

for remote stations.

The

shield

is

used

for ground return for audio

and

power.

When

choosing inter-

connect cable,

keep

the following considerations in mind:

1

DC

resistance

of

the ground

or

common conductor affects crosstalk.

For runs longer than 500 feet

do

not

use wire smaller

than

20 gauge.

2 The capacitance

of

the interconnect cable affects system frequency

response

and

sidetone stability. Total capacitance should

not

be

greater than 0.25

uFo

Portable Installation Cable: Practical cable for portable system interconnec­tions

is

flexible, two-conductor, shielded microphone cable. For runs less than

500 feet a cable

made

of

24

gauge wire is acceptable. For runs longer than 500

feet

use

a 20 gauge cable

or

larger.

Permanent

installation Cable: Vinyl-jacketed shielded pair

is

the cable

of

choice for permanent installations. Use a low-capacitance

20

gauge

wire for

short runs

(under

500 feet) and 18 gauge cable for runs greater

than

500 feet.

Placing the cable in conduit

is

recommended but not necessary.

Multi-pair cable that is indiVidually shielded

is acceptable for use in multi-

channel systems. For cross-talk considerations the shields must

be

tied togeth-

er

on

both

ends

of

the cable to

produce

the lowest possible

DC

path

for

ground

return.

Rev. A © Clear-Com Intercom Systems1994

11

RM-220 2 Channel Remote Station

DESCRIPTION OF CONNECTORS

Headset Connector (Front Panel)

NOTE ABOUT

HEADSETS:

The following

is

a description

of a recommended

headset.

Mic

Type - Dynamic

Wiring: Pin 1 - mic

common

Impedance - 150-250 Ohms Pin 2 - mic

hot

Output

--

-55dB Pin 3 -

headphone

common

Headphone

- Dynamic

Pin 4 -

headphone

hot

Impedance - 50-2000 Ohms

Panel Mic Connector (Front Panel)

Clear-Com provides two plug-in panel microphones for

use

on

the

RM-220

.

The

GM-9

is 9 inches long and

GM-18

is

18

inches long.

The

microphone

is

of

the electret type. The microphone has a builtin 1/4 inch

phone

jack for a con-

nector. A mating receptical is mounted

on

the

RM-220.

To

install a

GM-9

or

GM-18

panel mount microphone

use

the

following steps :

1 Check the set screw in the mic mounting flange

to

make

sure

it is

clear

of

the threads in

the

bushing.

2 Screw the microphone into the bushing

hand

tight.

3 Set the set screw

on

top

of

the bushing

to

lock the mic

in

place.

Intercom Line Connectors (Rear Panel, XLR-3 2 male & 2 female)

The

RM-220

has a male and female pair

of

XLR-3

connectors for

each

intercom

line.

The

male-female pair

of

connectors are wired parallel

and

intended

for

loop-thuough connection.

The

pinout

of

the Intercom Connectors is as follows:

Ground (Shield)

• Pin

1

• Pin 2

Power (+20

to

+30

VDC)

• Pin 3 Audio

©

Clear-Com Intercom Systems 1994 Rev. A

12

RM-220 2 Channel Remote Station

IFB/HOT Mic (Rear panel, 1/4 inch Phone Jack)

A

1/4

inch

phone

jack marked IFB/HOT Mic provides a 0 dB

output

signal

from the selected microphone. This

output

is

intended

to

work

with

Clear-

Com's

MA-4

IFB

control panel. A control signal into this

connector

from

the

MA-4

cause

all active Talks from

the

station

to

cease

and

only

send

an

output

to

this output.

The

pin

description

of

the

connector is

as

follows:

• Tip Microphone Audio

Output

• Ring Control Signal (>15 VDC)

• Sleeve - Ground (Shield)

ACCESSORY (Rear Panel, DB-15F)

The

Accessory DB-15F connector

on

the

rear

panel

provides

Program Input,

Announce

Audio

Output,

Announce

Relay Contacts,

and

Foot Switch inputs for

activating a Talk

on

either channel. The

pin

assignment

of

the

connector

is

as

follows:

"ACCESSORY"

CONNECTOR

DB-15F

FOOT SWITCH COMMON
FOOT SWITCH "S"

FOOT SWITCH "A"
GND.
ANNOUNCE RELAY N.

C.

CONTACT

ANNOUNCE RELAY WIPER

ANNOUNCE RELAY

N.O. CONTACT.

GND.

GND .

• ANNOUNCE AUDIO OUTPUT

+ANNOUNCE

AUDIO OUTPUT

PO\t\ER

(+30

VDC)

GND .

• PROGRAM INPUT
+ PROGRAM INPUT

Viewed from the rear

of

the connector

Rev. A

© Clear-Com Intercom Systems1994

13

RM-220 2 Channel Remote Station

DESCRIPTION OF OPTIONS AND ADJUSTMENTS

Dip Switch Option Switches (Rear Panel)

Eight dip switches

on

the

rear panel enable various options

in

the

station.

• Momentary only action only

on

the

TALK

switches.

• Automatically send a

CALL

signal

when a TALK

is active.

• Interrupt any active

TALKs

when

the

ANNOUNCE

button

is pressed.

• Interrupt any active

TALKs

when

the

IFB

drcuit

is activated.

• Feed

PROGRAM

audio

to

Chan.

"B"

and

disable the monitoring

of

PROGRAM

with the front panel control marked

PROGRAM.

• Interrupt the

PROGRAM

feed to Chan.

"B"

when a CALL

signal is

present

on

Chan.

"B".

The

RM-220

is shipped from

the

factory with all dip switches

in

the

OPEN

position.

To

enable a function place that

dip

switch

in

the

CLOSE

position.

w

Cf)

Z

o W

-.J

a..

(J

0

"-----

1

-MOMENTARYONLYTALKSW"A"

~:-:

2 - MOMENTARY ONLY TALK

SW"B"

~

- 3

-AUTO

CALL SIGNAL

ON

CHAN. "A"

- 4 - AUTO CALL SIGNAL

ON

CHAN. "B"

r-s~~i-i

5

-ANNOUNCE

TALK INTERRUPT ENABLE

- 6 - IFB TALK INTERRUPT ENABLE

- 7 -- PROGRAM FEED ENABLE CHAN. "B"

"-----

8 - INTERRUPT PROGRAM CHAN "B"

Mute Level Adjust (Rear Panel)

When a TALK

button is pressed

the

listen level in the Speaker will

"MUTE"

or

"DIP"

to a lower level that

is

set

by

the

MUTE

LEVEL

control.

To

disable the

function,

tum

the

control fully clock-wise.

The

maximum DIP is approximately

10

dB in

the

full counter-dock-wise pOSition.

© Clear-Com Intercom Systems 1994

Rev.

A

14

RM-220 2 Channel Remote Station

Panel Mic Level Adjustment (Internal)

The

microphone preamplifier for the Panel Microphone has

an

internal gain

adjustment control. This gain can

be

adjusted for different operating condi-

tions.

As

shipped from the factory the control

is

set to minimum gain such that

the panel microphone

and

a headset microphone have

the

same volume

when

worked

at

about

2 inches.

To

adjust

the

panel microphone gain, remove the

top

cover

of

the unit

and

ad-

just

R154

on

the right side

of

the printed circuit board. Refer

to

the illustration

below.

N3dO

--------

DIP!

- - --

~

- ------- -

CJ

L

--------

J1 --- -

:~D"

-

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·~99~

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U

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:

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I

R2S~~08

-

+04

OIl

"'1'$-

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m

C1

R4S=6]..J

-

ry1=l=.:-.

r:,

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ICI

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--

--c::F-R8z

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-- ,.t;

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- - -

R23

-

C9\d

---.

~R78

~010

,....

D5~1

_ - -

--c::r-R57

C80

~

'0

RTu-

r

I,

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R2

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..........

-t=>-R58

+8-

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~~

- _ +

--

--

05

~C44

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R60

I

~

--c::r-RI40

t;E3C22

RI

22

-~c

' -

RI54

I I

""

~-,

Rtf4

'~---I

RI23~-

R

ICIO

~

RIZ4[J]]-<=J-~-

-

uu<',

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~~

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~---

-,If",,- - ;----

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- - I -

74

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--c::r-

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.;:::::J--

RIOJ

- - - - I

-RSO

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--

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RI~-

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os-r1-

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RI05-~

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- ...............

99

,--

-..

__

.....J

GAIN

ADJUST

Location

of

Panel Mic Gain Adjust Control R154

Rev. A

© Clear-Com Intercom Systems1994

15

RM-220 2 Channel Remote Station

Intercom Line Length Compensation (Internal)

The

receive circuits

of

the intercom channels have

been

optimized for a Inter-

com

line

length

between

200

and

700 feet (60

and

200 meters).

The

capaci-

tance

of

the intercom line must

be

compensated for

in

the

receive circuits

if

a

good

sidetone null is to

be

achieved. When using a

speaker a good

sidetone

null

is

necessary

to

achieve a usable listening level.

A

set

of

jumpers has

been

provided for compensating for lines shorter than 200

feet

or

longer than 700 feet. Each intercom channel has its

own

jumper.

To

change

the setting

of

the Line Length Compensation Jumpers, remove the

cover

of

the

unit

and

move the jumper for

the

appropriate channel.

The

jump-

ers are next to

P3

about in the middle

of

the board. Refer the illustration

be-

low

for jumper selection. Set

each

channel for the setting appropriate for

it.

C")

a.

CHA

0

W

0
0
0
0

CHBW

0
0
0

JUMPER

SElTlNGS

>200 FT

>700 FT

<200 FT

<700 FT

t

~

W

Line Length

Compensation

Jumper

Settings

©

Clear-Com Intercom Systems 1994

Rev

. A

16

RM-220 2 Channel Remote Station

TYPICAL SYSTEM APPLICATIONS

ENGI EFP Truck

The

following block diagram describes a typical

ENG/EFP

Truck installation.

TELEPHONE

DIRECTOR

RY-220

CHANNEL A

INTERFACE

TEL-lOOO

RIl-220

OR

AC-10H

PROGRAM

NPUT

POWER

SUPPLY

TELCO

LINE

OPERATOR

F1.00R MANAGER

CAMERA ASST. DIRECTORI

PS-22

TALENT

ANNOUNCER

CHANNEL B

Typical

ENG/EFP

Truck

Installation

The system has two 2 channel

RM-220

rack

mount

stations.

The

system is

powered

from a 1

amp

Clear-Com

power

supply that also provides

the

ter-

minations for

both

channels.

Channel B is connected to Talent Recievers for announcers.

A telephone line interface is connected to

the

Program

input

of

station #2 that

provides a program feed from the studio via a dial-up

telephone

line. Its dip

switch options

are

set

to

insert program

on

channel B

and

interrupt

the

pro-

gram

when

a call signal is present

on

channel B.

The

option

dip

switches for

placing a Call signal

on

channel B is set

on

both

RM-220s.

Now, either

RM-220

will interrupt the program feed

to

the announcer

when

a Talk is initiated from

it

to

the announcers.

Rev.

A © Clear-Com Intercom Systems1994

17

RM-220 2 Channel Remote Station

Cable/School Television Studio

The

following block diagram describes a typical Cable

or

School Television

Studio installation.

ASSISTANT

DIRECTOR

VIDEO GRAPHICS

DIRECTOR

MR-I02

MR-I02

CAMERAS

FL.OOR MANAGERS

.

RS-501

RS-501

RS-501

RS-501

~

__

~

CHANtEL. B

PS-22

PROGRAM

INPUT

fROIA STAnON

SA OUTPUTS

PROVIDED

BY

USER

A

~

__

--,

PAGING SPK

IN

5ruOl0

"'XOI/

AlAP

Rld-220

~----------~.~----------~

RS-501

CHANNEL. A

TAL.ENT ANNOUNCER

Typical Cable

or

School Television Studio Installation

The system has several 2 channel

RM-220

rack mount stations

and

several wall

mount

2 channel stations. The system

is

powered

from a 1

amp

Clear-Com

power

supply that also provides the terminations for

both

channels.

A line

of

single channel beltpacks

is

connected to channel A. The beltpacks

are used for the cameras and floor managers. Normal communication

between

all parties

is

on

channel A.

Channel B

is

connected to Talent Receivers for announcers. Program that

is

to

feed the announcers

is

connected to the fIrst

RM-220.

Its dip switch options

are

set

to insert program

on

channel B and interrupt

the

program

when

a call

signal is present

on

channel

B.

The

option dip switches for placing a Call sig-

nal

on

channel B

is

set

on

both

RM-220s

. Now, either

RM-220

will interrupt

the program feed to the announcer

when

a Talk

is

initiated from it

to

the

announcers.
A

PA

amplifIer is connected to the

ANNOUNCE

output

of

the first

RM-220

such

that the operator

of

that station could talk directly to everyone in

the

studio.

© Clear-Com Intercom Systems 1994

Rev. A

18

RM-220 2 Channel Remote Station

ACTUAL APPLICATIONS

This section describes detail instructions for various types

of

applications. A

block diagram such as those in the previous section describing

an

ENG/EFP

Truck

and

a Cable/School Television Studio should

be

developed

for

your

ap-

plication.

The

following sub-topics in this section describe in detail

each

of

the

major application types that might

be

encountered.

The

sub-topics in this sec-

tion are:

•

Intercom

line

Wiring

•

Program Input

•

Internal

IFB

Operation

•

External

IFB

(MA-4

and

PIC-4000 Connection)

•

PA

Feed

to

StudioOutput

•

Remote Control

of

TALK

Switches

•

Inadequate Side-Tone Adjustment

Intercom Line Wiring

The Intercom Line wiring has several purposes in the Clear-Com system.

• Interconnection

of

the audio intercom signal

between

stations.

• Delivery

of

DC

power

for remote stations such as the

RM-220

to

operate from.

• Termination

of

the intercom

audio

line external to remote stations.

Interconnect the intercom lines

of

stations

and

power

supplies using a shielded

twisted pair cable with

XLR

3 pin connectors the

same

as

used

for balanced

microphones. Refer

to

the Installation Overview section

of

this manual

on

page

9 for more information.

The

RM-220

has a male and female pair

of

XLR-3

connectors for each intercom

line.

The

male-female pair

of

connectors are wired parallel

and

intended for

loop-thuough connection.

The

pinout

of

the

Intercom Connectors are as follows:

Ground (Shield)

• Pin 1

Power (+20

to

+30 VDC)

• Pin 2
Audio

•

Pin

3

Rev

. A

@ Clear-Com Intercom Systems1994

PROGRAM

INPUT

CAMERAS

.

t

RM-220 2 Channel Remote Station

19

The following application shows the practical interconnection

of

the intercom

lines in the block diagram

of

the Cable/School Television Studio

shown

on

page

17.

ASSISTANT

DIRECTOR

DIRECTOR

VDEO

GRAPHICS

I

:M:-l~211

I

~

I

n

t~.

rr

t .

.:;...

FLOOR

MANAGERS

~

______

~A~

______

-,

CHANNEl..

A

fROM STATION

TALENT

ANNOUNCER

CONN[CllON CODES

SA

OUTPUTS

J -

J-PIN

·XI.R"

~

-

"'-PIN

·XLR-

PIlOVlDED

BY

USER

1~ -DB-l~

B ~ 1/."

ST[RED PHONE PLUG (R'NG/llP/SL.E:EVE)

,--

____

..)A'-

____

______

C -

1/8"

..

ONO

PHONE

PlUC

(TIP/SLEEVE)

H -

SCREW

T[R>lINALS

To

W _

AC

POVo£R

CORO

Ear

P'-ce

[)J-i

>I'XER/Alo1P 1H

PACINC

CHANNEL

B

SPEAKER

Interconnecting a Small Cable/School

Television

Studio

The

entire system

is

wired using male/female microphone cables looped­through each station except for the MR-l02s. The MR-l02 has screw terminals
for the intercom lines.

The

PS-22

provides

the

DC

power

for

the

system

and

the

line termination switches must be turned ON.

CAUTION:

All

Clear-Com Intercom lines must

be

terminated.

Care

must

be

taken

not

to

fail

to

terminate

or

to

'double' terminate a line.

All

unused in-

tercom inputs must

be terminated

to

keep the line drive circuits stable.

The

RM-220

does

not provide termination

on

the

intercom line.

©

Clear-Com Intercom Systems 1994

Rev. A

20

RM-220 2 Channel Remote Station

Program Input

There

are

to

different

purposes

for

the

Program Input; monitoring

program

in

the

speaker

and

headphone

or

feeding

the

Channel B

intercom

line with

pro-

gram

material.

Monitoring

Program:

To

monitor Program

in

the

headphone

or

speaker:

•

Connect

the

Program

source

to

the

proper

pins

on

the

DB-IS.

• Make

sure

that

DIP switches 7 & 8 are

set

to

the

OPEN position.

• Set

the

front

panel

control

marked

Program for

the

desired volume.

Feeding

Channel B Intercom

Line:

To

feed

the B channel

with

program

material:

•

Connect

the

Program

source

to

the

proper

pins

on

the

DB-IS.

• Set DIP switch #7

to

the

CLOSE

position.

• Set

the

Program Send Level control

on

the

front

panel

just

underneath

the

Ch. B Listen Control for

the

desired

level

on

the

Intercom line.

• If it is desired

to

interrupt this program feed

when a CALL

signal is

present

on

the

intercom line

set

DIP switch #8

to

the

Close position.

To

Connect

To

The

Program

Input:

The

Program

Input

of

the

RM-220 is

available

in

the

DB-IS Accessory Connector

on

the

rear

panel.

The

input

is

electrOnically

balanced

with

an

input

impedance

of

IO

KOhms.

The

nominal

level

should

be

OdB

+/-

IOdB.

"ACCESSORY"

CONNECTOR

DB·15F

(Viewed from the rear

of

the unit)

PQIJI,£R

(+30

VDe)

GND.

- PROGRAM INPUT

+ PROGRAM INPUT

Connecting

Program

Sources

Rev. A

© Clear-Com Intercom Systems1994

21

RM-220 2 Channel Remote Station

Connect a balanced input to pins 8

and

15

with the shield

connected

to

pin

7.

To

connect

an

unbalanced input connect the signal to

pin 8 and

connect

the

shield to pins

15

and

7.

Connecting

Party-Line Products

As

Program Sources: If

other

Clear-Com

products

are

to

be

used

as a program source directly such as

an

AC-I0H Tele-

phone

interface

use

the following interconnection cable.

Pin 14

of

the DB-15

ACCESSORY

connector provides +30

VDC

to

power

the

external device. Connecting pins 7

and

15

together unbalances

the

Program

input. The

output

from the party line device

is

connected to

pin

8 with a

lK

ohm

load to provide a partial termination.

"ACCESSORY"

CONNECTOR

DB-15M

PCMtER

(+30

VDC)

(Viewed

from

the

rear

of

the

unit)

Connecting

Party-Line Products As Program

Sources

Internal IFB Operation

To

use

Channel B as

an

IFB

feed, connect

the

Program source to

the

Program

input

as

mentioned in the previous section

and

set DIP switches #7

and

#8 to

the

CLOSE

position.

The

program will

now

be

interrupted

whenever

there

is

a

CALL

signal present

on

Channel

B.

If there are multiple RM-220s in

the

system,

the program should only

be

feed into

one

of

the

RM-220s.

To interrupt

the

IFB

program automatically

when a TALK

on

the

B channel

is

active, set Dip Switch #4 to the

CLOSE

position. Set the same

dip

switch in

any other

RM-220

connected to

the

same channel

if

it is desired for them to in-

terrupt

the

program.

©

Clear-Com Intercom Systems 1994

Rev. A

22

RM-220 2 Channel Remote station

ExtemallFB

(MA-4 and PIC-4000 Connection)

Clear-Com provides a stand-alone

IFB

system called a PIC-4000.

The

PIC-4000

provides four interruptable

IFB

feeds from two program sources

and

located in

a central location. The

MA-4

is

a four channel control

head

intended

to

work

with the PIC-4000. A

MA-4

is

located at

each

location

where

program interrupt

is

to

be

initiated. Each

MA-4

has its

own

panel mounted microphone

which

when

mounted

next

to

an

intercom station with a panel

mounted

microphone

causes panel congestion with two microphones at a single location.
The

RM-220

has a 1/4 inch

phone

jack

output

on

its rear panel intended

to

connect directly

to a MA-4

and

provide a microphone feed

to

the

MA-4.

The

MA-4

can

be

ordered without a panel

mounted

microphone.

When

a button

is

pressed

on

the

MA-4,

a control signal will temporarily transfer the microphone

in

use

on

the

RM-220

to the

MA-4

muting

any

Talks active

on

the

RM-220.

To connect the

RM-220

to a

MA-4,

use a two wire shielded cable with

1/4

inch

tip, ring,

and

sleeve jacks

on

each end. Connect the tip to the tip,

the

ring to

the

ring,

and

use the shield to connect

the

sleeve to the sleeve.

POWER
8UPPLY

PS-22

1/4-

ASSISTANT

PHONE

JACK

DRECTOR

'-+------

TO

ADDmONAL

PARTY

UNE

8TAND ALONE

IFB SYSTEM

..__L-----'---'-71

PIC-4000

TALENT

RECEIVERS

Typical External IFB System Using a PIC-4000

and

MA-4

with

a RM-220

Rev. A

© Clear-Com Intercom Systems1994

23

RM-220 2 Channel Remote Station

PA Feed to Studio Output

Pressing the button marked "Announce"

on

the front

of

the

RM-220

temporarily

disables activity

of

the station

and

places the

output

of

the

selected micro-

phone

on

the ANNOUNCE AUDIO OUTPUT terminals

of

the

ACCESSORY

I/O

DB-15 CONNECTOR

on

the rear panel

of

the station. Isolated relay contacts

are

also available for controlling some external device

such

as a

PA

amplifier to

another

room.

The

audio

output

is

600 ohms impedance that

is

transformer

balanced

and

iso-

lated with a nominal

output

level

of

OdB.

To

connect to the ANNOUNCE out-

put, . connect a shielded twisted pair cable to pins

6

and

13

of

the

ACCESSORY

connector

and

use

pin

5 for connection

of

the shield.

A relay

is

provided that activates

when

the ANNOUNCE button is

pressed

and

its contacts are available

on

the

ACCESSORY

connector.

The

relay is rated for

2.0 Amps.

of

DC

current at

24

VDC.

"ACCESSORY"

CONNECTOR

DB-15F

GND.
ANNOUNCE RELAY N.C. CONTACT
ANNOUNCE RELAY WIPER
ANNOUNCE RELAY N.O. CONTACT.

GND.
GND.

-

ANNOUNCE AUDIO OUTPUT

+ANNOUNCE AUDIO OUTPUT

Connections for

Announce

Audio

and

Relay

Outputss

I

I

I

I

© Clear-Com Intercom Systems 1994

Rev. A

24

RM-220 2 Channel Remote Station

Remote Control

of

TALK Switches

The

TALK

switches

of

the

RM-220

can

be

remote controlled with external con-

tacts that are available

on

the

ACCESSORY

connector

on

the

rear panel. A

footswitch

or

remote pushbutton

when

wired

to the

ACCESSORY

connector

acts exactly the same as pushing a

TALK

switch

on

the front panel. Both latch-

ing

and

momentary actions are active.

FOOT SWITCH COMMON

" ACCESSORY"

CONNECTOR

DB-15F

....L

FOOT SWITCH "S"

~----------------~

\r

.....

~

FOOT SWITCH "A"

Connection

of

External Talk Switches

Inadequate Side-Tone Adjustment

The receive circuits

of

the intercom channels have

been

optimized for a Inter-

com Line length

between

200

and

700 feet (60

and

200 meters).

The

capaci-

tance

of

the

intercom line must

be

compensated for in

the

receive circuits if a

good

sidetone null is to

be

achieved.

When

using a

speaker a good

sidetone

null is necessary to achieve a usable listening level.

A set

of

jumpers has

been

provided for compensating for lines shorter

than

200

feet

or

longer than 700 feet. Each intercom channel has its

own

jumper. Refer

to

page

15

for changing these jumper for optimum operation.

Rev. A

©

Clear-Com Intercom Systems1994

25

RM-220 2 Channel Remote Station

OPERATION

Normal operation

of

the

RM-220

only requires access to

the

front

panel

con-

trols. For intercom operation set the

listen

Level controls for each channel to

desired level

and

press the Talk switches

when

talking. If a

headset

is being

used, set the sidetone control for the channel that

is

being

talked

to

for

the

de-

sired

amount

of

sidetone in the earphone. If the Panel Mic

and

Speaker are

being used,

set

the

sidetone control for minimum feed-through to

the

speaker

to prevent feedback.

The

rest

of

this section is a detailed description

of

each control.

Talk

Buttons

Each channel has its

own

illuminated "Talk" button for activating

the

micro-

phone

feed to a given channel. Mechanically the

push-button

is momentary in

action,

however

electrically the button has dual action (momentary

or

latching)

depending

on

how

the button is pressed. The latching function

can

be

de-

feated with a rear panel dip switch.

LATCHING: Pressing the button quickly will "toggle"

the

"talk" function, alter-

nately turning it

on

or

off.

MOMENTARY: Pressing

the

button for longer than 1/4

second

will

tum

the

button press into a momentary function such that

when

the

button

is released

the "Talk" function will

tum

off. In any case the

"Talk"

function is activated all

of

the time the button

is

pressed.

TALK INDICATION: The

"Talk"

button will illuminate dimly indicating

when

a

ItTalk"

is

activated.

CALL INDICATION: The

"Talk"

button will flash brightly

when a "Call"

signal

is received

on

that channel.

AUTO-CALL ON TALK: Each channel can

be

set

to

send

a call signal

when

the "talk" function

is

active. This function

is

used to activate

IFB

circuits

or

any

other "call" activated function available

on

other stations. A dip switch

option

on

the rear panel activates this function.

SPEAKER MUTE FUNCTION: Pressing either

"Talk"

button

will

cause

the

output

level

of

the

speaker to reduce

by

an

amount

set

by

the

rear

panel

Mute

control.

To

disable the function,

tum

the

Mute control fully clock-wise.

©

Clear-Com Intercom

Systems

1994

Rev. A

26

RM-220 2 Channel Remote Station

Call Buttons

Each channel has its

own

"Call"

button. Pressing the

"Call"

button at any time

will

send a "Call"

signal

on

that channel regardless

of

the activation

of

the

"Talk" circuit for that channel.
The "Talk" button for that channel will illuminate brightly while the

"Call"

but-

ton

is

pressed indicating the presence

of a "Call"

signal

on

the line.

Listen Level Controls

Each channel has a separate "listen

Level"

control. Listening

is

always

on

and

is

not controlled by

any

logic.

To

listen

to

a channel,

tum

up

the appropriate

control.

To

not listen to a channel,

tum

the control completely off.

Side Tone Controls

Each channel has a "Side Tone" null control. This control

is

used

to

set

the

amount

of

the microphone that

is

heard in the

earphone

from that channel.

This control

is

a true hybrid null control and therefore is sensitive

to

changes in

line loading. For

headphone

use it

is

best to find the 'null' for a given channel

and then rotate the control clockwise to obtain the desired side tone level.
If the

speaker

and

panel

microphone are used together providing a possible

acoustic feedback

path

it will

be

necessary

to

use

an

almost complete 'null'

of

the side

tone

control.

Program Send Level Control for Channel B

Channel B has a "Program Send

Level"

control that sets the amount

of

program

being

sent

to that channel

when

the program

is

activated.

Speaker ON/OFF Switch

The switch marked Speaker ON/OFF

is

used to turn the speaker

on

and

off.

Mic Select Switch

The

Mic

Select Switch enables the operator

to

select which microphone is

active.

Rev. A © Clear-Com Intercom Systems1994

27

RM-220 2 Channel Remote Station

Program Monitor Level Control

The

"Program" volume control sets the

amount

of

the program signal heard di-

rectly

in

the

headphone

or

speaker. This control only affects

what

is heard in

the

headphone

or

speaker

and

does

not affect "Program" feed to

the

intercom

lines.

NOTE: If Program is being feed to the Channel B intercom line the program
feed to the

headphone

and

speaker

is

disabled.

Announce Button

The

"Announce" button allows

the

operator to instantly

use

the microphone

input

to directly talk to a system external to

the

intercom such as a paging

speaker/amplifier in another room. A

dry set

of

relay contacts

on

the

rear pan-

el

is

also available that

can

be

used

to

activate external switching as

needed

when

the

Announce button

is

pressed.

Pressing the Announce button momentarily disables

any

active "Talks". Active

"Talk" circuits will

be

restored

when

the button

is

released.

The

"Talk" muting

action

can

be

defeated if desired by moving

an

internal jumper.

(see

section

on

internal options

and

adjustments)

© Clear-Com Intercom Systems 1994

Rev. A

-

-------

;:u

~

»

@

0

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..

b'

3

:;-

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8

3

en

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29

RM-220 2 Channel Remote Station

Bill

of

Materials for the RM-220

Miscellaneous

Device Description

JACK

STEREO

PC

MOUNT

1/4

IN

JUMP JAX

SEALECTR~264810

POT

50K

LINEAR

25MM

SHAFT

TRANSFORMER

600CT /600CT #TIC108

TRIM

POT

PIHER#PT10WH-50K

TRIMPOT

PIHER#PT10WV-50K
TRIMPOT PIHER#PT-10V-5K
TRlMPOT PIHER#PT-15V
REIAY

SPDT 24V MINI

PC

ITI#SZ24

SWITCH, DIP

PIANO 8 POS.
SWITCH, PB DPDT W/LONG PLUNGER
SWITCH, PB

DPDT

W /SHORT PLUNGER

SWITCH, PB

LOW PROFILE W /32V

LAMP

SWITCH,

ROC. DPDT, ROCKER

Capacitors

Value

Type Volts

To

I.

39

pF

Ceramic Disc 50V

5%

47

pF

Ceramic Disc

50V

10%

100

pF

Ceramic Disc

50V

10%

200

pF

Ceramic Disc 100V

5%

470

pF

Ceramic Disc

50V

10%

680

pF

Ceramic Disc

50V

5%

0.001

uF

Ceramic Disc

30V

20%

0.0022

uF

Mylar

100V

5%

0.0047

uF

Mylar

50V

5%

0.

01

uF

Ceramic Disc

30V

20%

0.01

uF

Ceramic Disc 1400V

20%

0.022

uF

Mylar 100V 10%

0.047

uF

Metal Polyester 100V

2%

0.047

uF

Mylar 100V

5%

0.1

uF

Monolithic

50V

10%

0.22

uF

Mylar

100V

20%

0.47

uF

Tantalum

35V

10%

© Clear-Com Intercom Systems 1994

Part #

210135
210103
470070
560018
470059
470038
470022
470069
450004
510110
510107
510106
510104
510111

Part #

150026
150041
150006
150063
150014
150094
150052
150045
150114
150012

150029
150008
150123
150131
150035

150003
150110

Designator

J1
JP1 JP2

R109 R110

R111
T1
R121
R112
R154
R107 R108
K1

DIP1

S5
S6 S7
Sl

S2

S3

S4

Designator

C20 C22
C31 C38 C68 C69
C24 C26 C29 C30
C48

C5I
C36 C37 C73 C74 C79
C62
C35
C46 C47
C54 C56 C63 C64 C95
C3

C6 C72 C76 C77

C81
C92
C89
C4

C5

C41
C67
C49 C50 C52 C53 C57 C71
C10

C11

C12 C13 C14

CI5
C18 C19 C25 C28 C32 C39
C40 C42 C75 C78
C84 C87
C7 C8 C65 C66

Rev. A

30

RM-220 2 Channel Remote Station

Capacitors ... continued

Value Type Volts

Tot

Part # Designator

0.47

uF

Aluminum

50V 150151

C9 c60

C61

1 uF Tantalum

35V

20% 150116 C45

1

uF

Aluminum

50V

10% 150002

C43 C44 C58 C82 C83 C90
C91

C93

2.2

uF

Aluminum

50V 150065 C59 C94

4.7

uF

Aluminum

50V 150087

C21 C23

10

uF

Aluminum 50V 150064

C1

C2

22

uF

Aluminum

35V

20% 150152 C17 C55 C80

47

uF

Aluminum

35V

150081

C34 C70

100

uF

Aluminum

35V

150136

C27

220

uF

Aluminum

35V

150021

C88

1000

uF

Aluminum

35V

150092 C33

10,000

uF

Aluminum

35V 150153

C85

Resistors & Resistor Packs

Value Power

Type

Tot

Part # Designator

2.2

OHM

1/4

Carbon

Film

5%

410113

R73 R128 R129

10

OHM

1/4

Carbon

Film

5%

410002

R147

22

OHM

1/4

Carbon

Film

5%

410004

R37

R38

R91

R114

39

OHM

1/4

Carbon

Film

5%

410008

R156 R157

47

OHM

1/4

Carbon

Film

5%

410039

R46 R47 R67

50

OHM

5

Wire

Wound

5%

410186

R130

82

OHM

1/4

Carbon

Film

5%

410038

R106

100 OHM

1/4

Carbon

Film

5%

410071

R83

R88

430 OHM

114

Carbon

Film

5%

410106

R100

R113

R155

820

OHM

1/4

Carbon

Film

5%

410096

Rl34

R135

1K

OHM

1/4

Carbon

Film

5%

410010

R90

l.5K

OHM

1/4

Carbon

Film

5%

410055

R87

1.8K OHM

1/4

Carbon

Film

5%

410035

R84

2K

OHM

1/4

Carbon

Film

5%

410014

RIO

R23

R55

R61

R120

4.7K OHM

1/4

Carbon

Film

5%

410013

R89 R124

6.2K

OHM

1/4

Carbon

Film

5%

410137 R52

R78

6.81K OHM

1/8

Carbon

Film 1%

410063 R66

R71

7.5K

OHM

1/4

Carbon

Film

5%

410171

R31

R43

8.2K OHM

1/4

Carbon

Film

5%

410037

R116

10K

OHM

1/4

Carbon

Film

5%

410016 R17

R32 R62

R64 R79

R94

Rl15 Rl19

R122

R131

R

1.

33 R143

12K OHM

1/4

Metal Film

1%

410140 R70

R85

R86 R105

15K

OHM

1/4

Carbon

Film

5%

410017

R139

R141

Rev. A © Clear-Com Intercom Systems1994

31

RM-220 2 Channel Remote Station

Resistors & Resistor Packs ... continued

Value Power Type

Tol.

Part #

Designator

20K

OHM

1/4

Carbon

Film

5%

410151

R49

R51

R56

R58

R98 R99

R125 R126

22K

OHM

1/8

Metal Film

1%

410157

R72

R1l7

R118 R123

30K

OHM

1/4

Carbon

Film

5%

410090 R140 R142

39K

OHM

1/4

Carbon

Film

5%

410019

R132

39.2K OHM

1/8

Metal Film

1% 410111

R76

R77

47K

OHM

1/4

Carbon

Film

5%

410021

R5

R6

R7

R18

R29

R30

R95

R96

R127

Rl44

R160

47.5K OHM

1/8

Metal Film 1%

410105

R101

R102 R103 R104

lOOK

OHM

1/4

Metal Film 1% 410148

R74

R75

lOOK

OHM

1/4

Carbon

Film

5%

410024

R1

R2

R3 R4

R12

R13

R14

R15

R16 R19

R21

R24

R25

R26

R27

R28 R33

R34

R35

R36

R44

R54 R60

RSO

R81

R92

R136

120K

OHM

1/4

Carbon

Film

5%

410079

R53

R59

220K OHM

1/4

Carbon

Film

5%

410028

R42 R45

R158 R159

330K

OHM

1/4

Carbon

Film

5%

410033

R63

R69

390K

OHM

1/4

Carbon

Film

5%

410029

R50

R57

470K

OHM

1/4

Carbon

Film

5%

410030

R8

R9

R11

R20

R22

R65

R68

R93

1M

OHM

1/4

Carbon

Film

5%

410058

R39

R48

10M

OHM

1/4

Carbon

Film

5%

410059

R82

R97

Diodes,Transistors, and Intergrated Circuits

Device

Description

Part #

Designator

1N4003

RECTIFIER,

1A

200PIV

480058 D6 D21

1N4148 SIGNAL DIODE, 10MA

75PN

480000

D1

D2 D4 D7 D8

D9

D10

Dll

D12

DB

D14 D15

D16 D17 D18

D19

D20

1N957B

DIODE, 6.8V

ZENER

4W

5%

480026

D3 D5

2N5639

TRANSISTOR, JFET

NCHAN

480069

Q9Q10

4001

CMOS QUAD 2 INPUT NOR 480112

IC4

IC5

4011

CMOS QUAD 2 INPUT

NAND

480111

Ic6

4013

CMOS

DUAL

D TYPE

FF

480171 IC2

4584B

CMOS

HEX

SCMITT

TRIG 480090

IC1

IC3

78L15H

REG

ULA

TOR, NEG. 15V 100MA 480078 IC18

DG211

CMOS QUAD ANALOG SWITCH

480092

IC7 IC10

LM833N

OP

AMP,

DUAL LOW NOISE 480175

IC12 IC13 IC17

LM384

OP

AMP,

4W POWER 480012

IC81C9

MPS-A13

TRANSISTOR, NPN 30V

DARL

480004 Q1

Q2 Q3 Q6

Q7

Q8

Ql1

MPS-A63

TRANSISTOR, PNP 30V

DARL

480008

Q4

Q5

RC4559NB

OP

AMP,

DUAL 8 PIN DIP 480056

ICll

IC14 IC15 IC16

© Clear-Com Intercom Systems 1994

Rev. A

::0

w

~

>

'"

ANNOUNCE

~

0-

0'

PANEL

SIDET[)£

HEADPHONE

o:l

~

o

f;)'

::tJ

ao

MIC

$

~

~

S

PANrL

MIC

~

o

GAIN

AD-.JUST

0'

..,

I\l

PROG

.

o

So

LEVEL

::T

(b

01

@

::l
::l

()

~

~

m

I

::tJ

i'

N

i

(II

()

N

o

.

..

3

::J

BAL:.LANCED

PROG.

PROG.MUTE

"

PROGRAM

VOLUME

IV

8

INPUT

i

ci'

i

3

::l

3

!II

.....

<0

~

MUTE
ENABLE

33

RM-22D 2 Channel Remote Station

ff1U

~

5iJ*BU:~.

_________

__

_____

_I'

"~=t.'••~

I.t~

I·-,~

____ _.__

_______

____________________

_

'

,~

:

".:'"

~

~ ; ~=0

,l ,.,

".

~

~

,

.""'"""

'

iii;;;' !,

"

. " . '

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'0"'

~

>

: - -

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' :

INP

UT

~~:..:';...

C

I

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I

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:_""

>:.-'~

I

III

CONTINUED

ON

SHEET 2

NOTES·

(UNLESS

CT

HERWlSE

S~ECIFIED)

.~""",,,,,rlOlOVOCri;IC.II!_T_

....

'-

I..

IO(".·T~

... " ••

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i.

UT

f,.c.

I~..:I~

0:"

'"

~,

~~

~~;f

!t

Schematic Diagram Sheet 1

for

the

RM-220

© Clear·Com Intercom Systems 1994

Rev. A

35

RM-220 2 Channel Remote Station

,---------------

I

h~T100>CD_L_,;

,---------------

FRO

NT P ANEL

T

ALK

A

~

K8

" I I - I

~

000><

- -

V--

I

II

~£4~

~

CALL

CALL

I '

,~

l

l~!;:!<'

~

11~~lJ<.

~

_

~

-'~ ~ ~~~~

~ _~

-' ~ -,'

~'~

'..,'~

'-,'-,

'_'

-,'-,

'-,'

-,"'

-,"'

J"'

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J.~Il--~

-~~.

~

L:?::'

~,u"---<3!="""""!Il:,'

-

~

A

B

..

"

'.

II

'-",;",j;-'

,~

~l::~, ~ "

I

' I

.,

""

I

~

~....

',0>->-,:'----"

'>:';'0

i,--

-+----

-+-

t-~

?:oo<

. ?

l@

,,~~

FLASH

",

~

I I I I I l

~

~~

F1T''''Flp

:.

'r:

T~.:.'

1.

-·",,,u~,u,.,,,..u=, U

~

CONTI

NUED FROM

SHEET

1

PO

n'ER

&.

GNO

OF I Cs

Schematic Diagram Sheet 2 for

the

RM-220

©

Clear-Com

Intercom

Systems

1994

Rev, A