Clear-Com RM-702 User Manual

CLEAR-COM ENCORE

RM-702 TWO-CHANNEL REMOTE STATION

INSTRUCTION MANUAL

RM-702 Two-Channel Remote Station Instruction Manual

Part Number 810343Z Rev. 4

Legal Disclaimer

Copyright © 2013 HME Clear-Com Ltd.

All rights reserved.

Clear-Com, the Clear-Com logo, and Clear-Com Concert are trademarks or registered trademarks of HM Electronics, Inc.
The software described in this document is furnished under a license agreement and may be used only in accordance with the
terms of the agreement.

The product described in this document is distributed under licenses restricting its use, copying, distribution, and decompilation/
reverse engineering. No part of this document may be reproduced in any form by any means without prior written authorization
of Clear-Com, an HME Company.

Clear-Com Offices are located in California, USA; Cambridge, UK; Montreal, Canada; and Beijing, China. Specific addresses
and contact information can be found on Clear-Com's corporate website:

www.clearcom.com

Clear-Com Contacts

Americas and Asia-Pacific Headquarters

California, United States
Tel: [phone]
Email: [e-mail]

Europe, Middle East, and Africa Headquarters

Cambridge, United Kingdom
Tel: [phone]
Email: [e-mail]

Canada Office

Quebec , Canada
Tel: [phone]

China Office

Beijing Representative Office
Beijing, P.R.China
Tel: [phone]

CONTENTS

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

The Clear-Com Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Talk Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Call Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Volume Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

SideTone Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Program Send Level Control for Channel A and B . . . . . . . . . . . . . . . . . 1-4

Speaker On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Mic Select Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Program Monitor Level Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Announce Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Intercom Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Connecting or Isolating RM-702 Channels . . . . . . . . . . . . . . . . . . . . . . . 2-1

Line Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Station Powering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Cable Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Description of Front panel Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Headset Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Panel Mic Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Description of Rear Panel Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Intercom Line Connectors

(Rear Panel, XLR-3 2 Male & 2 Female) . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

IFB/Hot Mic (Rear Panel, 1/4-Inch Phone Jack) . . . . . . . . . . . . . . . . . . . 2-5

Accessory (Rear Panel, DB-15F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Description of Options and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

DIP Switch Option Switches (Rear Panel). . . . . . . . . . . . . . . . . . . . . . . . 2-6

Re-Setting Program Interrupt Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Panel Mic Level Adjustment (Internal) . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Intercom Line Length Compensation (Rear-Panel DIP Switches) . . . . 2-10

Program Feed on Announce. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Typical System Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

ENG/EFP Truck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Cable/School Television Studio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Actual Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

RM-702 TWO-CHANNEL REMOTE STA-

i

Intercom line wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Program Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Internal IFB Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

External IFB (MA-704 and PIC-4704 Connection). . . . . . . . . . . . . . . . 2-16

PA Feed to Studio Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Remote Control of Talk Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Inadequate Side-tone Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 4-1

RM-702 Two-Channel Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . 5-I

Warranty Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i

Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i

Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii

Non-Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii

Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii

Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii

Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii

ii

RM-702 TWO-CHANNEL REMOTE STATION

Please read and follow

these instructions before

operating this product.

IMPORTANT SAFETY
INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.

9. Only use attachments/accessories specified by the manufacturer.

10. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from
tip-over.

11. Unplug this apparatus during lightning storms or when unused for long
periods of time.

12. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled or objects have fallen into
the apparatus, the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.

13. WARNING: To reduce the risk of fire or electric shock, do not expose
this product to rain or moisture.

Please familiarize yourself with the safety symbols in Figure 1. When you
see these symbols on this product, they warn you of the potential danger
of electric shock if the station is used improperly. They also refer you to
important operating and maintenance instructions in the manual.

RM-702 TWO-CHANNEL REMOTE STATION

iii

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.

This symbol informs you that important operating and main­tenance instructions are included in the literature accompanying
this product.

Figure 1: Safety Symbols

EMC AND SAFETY

The RM-702 station meets all relevant CE and FCC specifications set out
below:

EN55103-1 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 1: Emissions.

EN55103-2 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 2: Immunity.

And thereby compliance with the requirement of Electromagnetic
Compatibility Directive 2004/108/EC and Low Voltage Directive
2006/95/EC

This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.

iv

RM-702 TWO-CHANNEL REMOTE STATION

OPERATION

INTRODUCTION

Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercoms for
entertainment, educational, broadcast, and industrial applications. The
ruggedness and high build-quality of Clear-Com products defines the industry
standard. In fact, many of our original beltpacks and main stations are still in
daily use around the world.

THE CLEAR-COM CONCEPT

Clear-Com is a closed-circuit intercom system that consistently provides
high-clarity communication in high-noise and low-noise environments. A
basic system consists of a single- or multi-channel power supply or main
station connected to various single- or multi-channel remote stations, such as
beltpacks and loudspeaker stations.

Clear-Com manufactures a wide variety of both portable and
fixed-installation units. All are compatible with each other. Clear-Com
intercom systems can also interface with other 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 from a main station or power supply to all remote stations, and the
other wire carries two-way (duplex) audio information. The shield acts as a
common ground. One termination (per channel) is needed throughout the
intercom 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 preamplifier, headset or speaker power amplifier, and
signaling circuitry. Low-impedance mic input lines and specially designed
circuitry make Clear-Com channels virtually immune to RFI and dimmer
noise.

Clear-Com main stations, power supplies and certain remote stations have
auxiliary program inputs with local volume control, allowing an external
audio source to be fed to the intercom system.

Visual signal circuitry (call lights), a standard feature on most main and
remote stations, allows the user to attract the attention of operators who have
removed their headsets.

Depending on the type of main and remote stations selected (and assuming
that enough DC power is available) remote stations can be distributed along a
mile of wire. Remote stations bridge the intercom line at a very high
impedance and place a minimum load on the line. The audio level always

RM-702 TWO-CHANNEL REMOTE STA-

1-1

remains constant, and does not fluctuate as stations leave and join the
network.

DESCRIPTION

The RM-702 is one of a series of professional intercom stations specifically
designed for the broadcast industry. This two-channel, one-rack-space station
is ideal for ENG and EFP trucks, production studio consoles, and small TV
facilities. The station can be tailored to your needs through its programmable
talk button options. The RM-702 is compatible with all Clear-Com party-line
intercoms.

The station also incorporates an internal single-channel program interrupt
system (IFB). When activated, one or more stations can interrupt the program
to a talent with Clear-Com’s wired or wireless talent receivers. Direct
connection to Clear-Com’s IFB system is easily accomplished through a 1/4
in. (0.62 cm) phone jack on the rear panel intended to directly connect to a
Clear-Com MA-704.

The RM-702 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.
Illuminated dual-action talk buttons provide electronic momentary or latching
capability. The latching feature may be disabled if desired. The talk buttons
can also be remote controlled for footswitch or other use. Monitoring activity
is possible through the speaker or headset or both at once.

The RM-702 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 in. (22.86 cm) and 18 in. (45.72
cm), 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
dipping circuit provides an additional amount of acoustic output before
feedback. 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
controls for each channel allow the operator to vary the level of his/her own
voice as heard in the headset/speaker.

Studio announce allows control of a paging speaker in a studio. A front panel
button activates this function and an associated relay.

The RM-702 installs in a standard 19 in. (48.26 cm) equipment rack, using
only one rack space. The station provides two 3-pin, XLR connectors for
input and loop-through on each channel.

1-2

RM-702 TWO-CHANNEL REMOTE STATION

OPERATION

Panel Mic

Speaker

Program

Level

On

Off

Sidetone

Null

Level

Announce

Level

ProgramProgram

Channel A Channel B

Sidetone

Null

Volume

Volum e

Talk

Headset

Panel Mic

Headset

2-Channel

Remote Station

RM-702

Call

Tal k

Buttons

Call

Buttons

Channel A

Vol ume

Channel B

Vol ume

Channel A

Sidetone

Channel B

Sidetone

Program

Level A

Program

Level B

Speaker

Switch

MIC

Select

Switch

Announce

Button

Program

Monitor

Level

Panel

Microphone

Panel

Headset

Normal operation of the RM-702 requires access only to the front panel
controls. For intercom operation, set the listen level controls for each channel
to the desired level and press the talk switches when talking. If a headset is
being used, set the sidetone control for the receiving channel for the desired
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.

Figure 1-1: RM-702 Front Panel

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
microphone feed to a given channel. Mechanically, the pushbutton 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 defeated with a rear-panel DIP switch.

• LATCHING: Pressing the button quickly will toggle the talk function,
alternately turning it on or off.

• MOMENTARY: Pressing the button for longer than 1/4 second will turn
the button press into a momentary function such that when the button is
released the talk function will turn off. In any case the talk function is
activated all of the time the button is pressed.

• TALK INDICATION: The talk button illuminates yellow when a talk is
activated and blue when talk is not active.

• CALL INDICATION: The call button will flash red 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 on the rear panel activates this function.

RM-702 TWO-CHANNEL REMOTE

1-3

• SPEAKER DIP FUNCTION: Pressing either talk button will reduce the
output level of the speaker by a set amount to avoid feedback.

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 call button for that channel will flash red while the call button is pressed
indicating the presence of a call signal on the line.

VOLUME CONTROLS

Each channel has a separate volume control for monitoring incoming audio.
Listening is always on and is not controlled by any logic. To listen to a
channel, turn up the appropriate control. To not listen to a channel, turn the
control completely off.

SIDETONE CONTROLS

Each channel has a sidetone null control. This control sets 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 sidetone
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 sidetone control.

PROGRAM SEND LEVEL CONTROL FOR CHANNEL A AND B

Both channels A and B have a program send level control that sets the volume
of program audio 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

1-4

The mic select switch enables the operator to select which microphone is
active.

RM-702 TWO-CHANNEL REMOTE STATION

PROGRAM MONITOR LEVEL CONTROL

The program volume control sets the amount of the program signal heard
directly 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.

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
panel is also available for activating external switching, as needed when the
announce button is pressed.

The button illuminates amber when 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 the section on internal options and adjustments.)

RM-702 TWO-CHANNEL REMOTE

1-5

1-6

RM-702 TWO-CHANNEL REMOTE STATION

INSTALLATION

This section discusses the installation of the RM-702 in an intercom system
including typical applications, overall installation theory, detail of each
connector, and adjustments.

INSTALLATION OVERVIEW

This section describes the Clear-Com concept of intercom line connection.
The following subjects are discussed:

• Intercom line connection

• Line termination

• Station powering

• Cable considerations

INTERCOM LINE CONNECTION

The RM-702 provides male and female XLR-3 connectors for each intercom
line, which are looped through.

CONNECTING OR ISOLATING RM-702 CHANNELS

An internal jumper in the RM-702 unit allows you to defeat the
power-channel isolation of the unit, as described in the following procedure.

Note: This adjustment should only be carried out by qualified service

personnel.

RM-702 TWO-CHANNEL REMOTE

2-1