Clear-Com RM 220, RS 501, RS 601, RS 6W, RS 5TR, MR 102, T15TR 50 intercom station, PS 22 power supply, TX 50 talent receiver, PIC 4000, MA 4 IFB control panel, AC 10H telephone interface Instruction manual

*

RM-220

2-CHANNEL REMOTE STATION

INSTRUCTION and

SERVICE MANUAL

z

IIi4IIMI~ l||V

intercom Systems

945 Camelia St. Berkeley, California 94710 510-526-6666

Clear-Com 810193

8/24/94 REV. A

Clear-Com Systems

RM-220 2-Channel Remote Station

Instruction Manual

P/N 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.

0

RM-220 2 Channel Remote Station

0

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 authorized 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 "Procedures for Returns" and "Shipping to Manufacturer for Repair or Adjustment."

3

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 purchase 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-Corn nor the dealer who sells Clear-Corn 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 Customer Service Department, located at the factory, as directed below. They will issue a Return Authorization Number (RMA).

-- Do not return any equipment to the factory without first obtaining a Return

Authorization Number.

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Clear-Com Intercom Systems 1994 Rev. A

4

RM-220 2 Channel Remote Station

-Be prepared to provide your company's 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: (510) 527-6666

Fax: (510) 5279$699

Shipping to Manufacturer for Repair or Adjustment

All shipments of Clear-Com equipment must be prepaid via United Parcel Service 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 container is used, the equipment should be wrapped in paper and surrounded with at least four inches of excelsior or similar shock-absorbing material. A detailed description of the problem or work to be done should be included. All shipments should be directed to the attention of the Customer Service Department and must include the Return Authorization Number.

Upon completion of repairs, equipment will be returned collect via United Parcel 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 installation. 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-Corn Intercom Systems1994

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 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-Corn 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

(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 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 (200 Ohms) and specially designed circuitry make Clear-Com channels virtually immune to RF1 and dimmer 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 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 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 fluctuate as stations leave and join the network.

5

{) 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 specifically designed for the broadcast industry. This 2 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 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 (IFB) 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 connection to Clear-Com'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. Illuminated dual action talk buttons are electronic momentary or latching. The latching 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 dipping" circuit will give you an additional amount of acoustic output before feedback. This feature helps to reduce feedback when stations are placed in dose 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 allows the operator to vary the level of his/her own voice as heard in the headset/speaker.

Rev. A

i) Clear-Com Intercom Systems1994

RM-220 2 Channel Remote Station

7

"Studio Announce" allows control of a paging speaker in a studio. A front panel button activates this function and an associated 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 loopthrough on each channel,

TECHNICAL SPECIFICATIONS:

CONTROL SYSTEM:

CMOS Digital Logic and Signal Switching

HEADSET MICROPHONE PRE-AMP:

Dynamic Headset Input Impedance

----

Input Level ---------

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

-

1 KOhms

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

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

Frequency Response:

---------

Gain from Panel Mic to Intercom Line: --

45 dBv' nominal

250 Hz to 12 KHz, contoured for intelligibility.

+31 dB (adjustable)

SPEAKER AMPLIFIER:

Load Impedance: ---------------------- 16 Ohms

Output Level: --------

Distortion: -------------------

-- ---------- at least 4 watts

<0.2% THD at 1 KHz

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

HEADPHONE AMPLIFIER:

Load Impedance:

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

Output Level: -----------------------

Distortion:

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

Frequency Response:

--------

Gain from Intercom Line:

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

----- greater than 50 Ohms at least +20 dBv across 600 ohm

<0.2% THD at 1 KHz

200-18KHz +/-2dB

+37 dB

PROGRAM INPUT:

Input Level Ref.: ---------------------------

Input Impedance: -

-10 dBv*

----------------- >40 KOhms

Frequency Response: -------- 150 Hz to 15 KHz

Rev. A

8

Rev. A

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

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

Unbalanced

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:

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

Accessory

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

Program Input

SA output

4

XLR-3

(2-CH A, 2-CH B)

DB-15F

Foot Switch Logic Inputs

IFB/HOT MIC. ---------------

-----------

1/4 inch Phone Jack

POWER REQUIREMENTS:

Source ---------

--------------------------------- Intercom Line

Voltage ---

-------------------- - 20 - 30 VDC

Current ----

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

65 mA idle, 120 mA average

PHYSICAL SPECIFICATIONS:

Dimensions: ---- ----- ------ x 1.75"H x 7..OD

Weight:

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

3.6

(483mm x 44.5mm x 178mm) lbs

(1.6 Kg)

Operating Temperature Range:

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

32-122° F (0-50° C)

*

- OdBv = 0.775 volts RMS.

(Specifications subject to change without notice.)

( Clear-Com Intercom Systems1994

RM-220 2 Channel Remote Station

9

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 attempts to reject (null) any "talk" signal being sent by that station on that channel. 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-Corn Intercom lines must be terminated. Care must be taken not to fail to terminate or to 'double' terminate a line. All unused intercom inputs must be terminated to keep the line drive circuits stable.

The RM-220 does not provide termination on the intercom line. Clear-Corn main stations and power supplies provide switch selectable termination networks 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 networks. A double or multiple terminated line will cause low levels and sever unbalance of hybrid null circuits.

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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 connectors. 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 interconnect cable, keep the following considerations in mind:

I 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 uF.

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 multichannel systems. For cross-talk considerations the shields must be tied together on both ends of the cable to produce the lowest possible DC path for ground return.

Rev. A i Clear-Com Intercom Systems1994

RM-220 2 Channel Remote Station 11

DESCRIPTION OF CONNECTORS

Headset Connector (Front Panel)

NOTE ABOUT HEADSETS: The following is a description of a recommended headset.

Mic Type ---

Dynamic

Impedance - 150-250 Ohms

Output --

-55dB

Headphone -- Dynamic

Impedance --- 50-2000 Ohms

Wiring: Pin

1

-- mic common

Pin 2 - mic hot

Pin 3

headphone common

Pin 4

headphone hot

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 connector. A mating receptical is mounted on the RM-220.

To install a GM-9 or GM-18 panel mount microphone use the following steps:

I 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:

*

Pin I -- Ground (Shield)

*

Pin 2 --- Power (+20 to +30 VDC)

*

Pin 3 --- Audio

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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-

Corn'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:

1>

2

3

4

9

10

12 a f

(

"ACCESSORY"

CONNECTOR

DB-ISP

b

FOOT SWITCH COMMON

FOOT SWITCH 'E'

FOOTSWITCH A'

GND.

ANNOUNCE RELAY N.C. CONTACT

ANNOUNCE RELAY WIPER

ANNOUNCE RELAY N.O. CONTACT.

GND.

7

6

1(3 a a

-

ANNOUNCE AUDIO OUTPUT

+ANNOUNCE AUDIO OUTPUT

POWER (+30 VD)C) a GND.

(3

-

PROGRAM INPUT

+

PROGRAM INPUT

Viewed from the rear of the connector

Rev. A i) Clear-Corn intercom Systemsl 994

0

RM-220 2 Channel Remote Station

13

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 circuit 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.

uJ in Z

-J

CO

a.

1

--

MOMENTARY ONLY TALK SW "A"

2 -- MOMENTARY ONLY TALK SW "B"

3 -- AUTO CALL SIGNAL ON CHAN. "A"

4 -- AUTO CALL SIGNAL ON CHAN. "B"

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, turn the control fully clock-wise. The maximum DIP is approximately

10 dB in the full counter-clock-wise position.

©) Clear-Com Intercom Systems

1994

Rev. A

14

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 conditions. 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 adjust R154 on the right side of the printed circuit board. Refer to the illustration below.

.

KI

1

-l--3 el

-_D

d124--C==3

i

-

-

-

:

-

_

-2-- --

3

-4---

-

--

-

R12

-

-

*

GAIN ADJUST

Location of Panel Mic Gain Adjust Control R154

©

Clear-Corn intercom Sysstemsl994

0

Rev. A

RM-220 2 Channel Remote Station

15

Intercom Line Length Compensation (Internal)

The receive circuits of the intercom channels have been optimized for a Intercom Line length between 200 and 700 feet (60 and 200 meters). The capacitance 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 jumpers are next to P3 about in the middle of the board. Refer the illustration below for jumper selection. Set each channel for the setting appropriate for it.

0

MD 0

CHBE 0

0

0~~~~~

<200 FT

JUMPER SETTINGS

~~~~~~>200

<700 FT

>700 FT

Line Length Compensation Jumper Settings

©

Clear-Com Intercom Systems 1994

Rev. A

16

RM-220 2 Channel Remote Station

TYPICAL SYSTEM APPLICATIONS

ENG/ EFP Truck

The following block diagram describes a typical ENG/EFP Truck installation.

DIRECTOR

RM-220

ENGINEER

RM-220

INTERFACE

TEL-1O00

POWER

SUPPLY

P-22

CAMERA

OPERATOR

RS-501

B

ASST. DIRECTOR/

FLOOR MANAGER

E

RS-501

50:

CHANNEL A

TALENT

ANNOUNCER lii]

TELCO

LINE

CHANNEL

E

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 terminations 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 program 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

RM-220 2 Channel Remote Station

Cable/School Television Studio

The following block diagram describes a typical Cable or School Television

Studio installation.

17

DIRECTOR

rod

RM-220

VIDEO

ASSISTANT

GRAPHICS

rod rub

W

URjW-102

M

L

MR2

-220

MR-R

FLOOR MANANCERS

RS-6W-

RS-5TR

SN

T T

RS-601

CANCERA

RS-__

_

RS-601

PRNOGORAM"

FROM

:

CHANNEL A

TALENT

ANNOUNCER

SIXER/^MP CHANNEL a

SPK

IN STUDIO

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 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.

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

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 application. 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 secdon 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-Corn 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-thlough connection.

The pinout of the intercom Connectors are as follows:

*

Pin 1 -

Ground (Shield)

*

Pin 2 --- Power (+20 to +30 VDC)

*

Pin 3 --- Audio

Rev.

A

i Clear-Com Intercom Systems1994

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.

DIRECTOR

ASSISTANT

DIRECTOR

3

D

____

FS

| br5

rRM-220/GM

|i

|barFa

L

3

Lt

I

_

{STACES.

WA~~~~~O

H)&220/GUM

"

VIDEO

GRAPHICS

|

.

|

F=_

{

'~

~~

tH~o

|

l

I

|

H e

x

&A

P.

Hf..|L>ds....TL.......

12

PROGRAM

INPUT

i

PACING

SPEAXER

P_22I

CAMERAS

_

_

FLOOR MANAGERS

_

T.

TOgdseTTT

Hea-22tHC

r

7

CHANNEL A

tNlH

TALENT l

CANL9N

CHANNEL B

ANNOUNCER

E, PiceY

L~~~J

Ec Pt

CCNNECI1ON

CODES

_ _ _ _ _ _ _ _ _ _ _ _ _ _

3:

.:3PIN 'X~r

'5 0-1N

LR

1/4-I/

STEREO PHONE PLUG (TGn/~~E

C - T/8

MONO

PHONE PLUG (nTI/SLEEE)

~H

-

SCEW TERMAINALS

W

*

AC POWER CORD

_ _ _ _

god

L

1,A,

OFFS

Interconnecting a Small Cable/School Television Studio

The entire system is wired using male/female microphone cables loopedthrough each station except for the MR-102s. The MR-102 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 intercom inputs must be terminated to keep the line drive circuits stable. The

RM-220 does not provide termination on the intercom line.

i Clear-Com Intercom Systems 1994

Rev. A

20

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 program material.

Monitoring Program: To monitor Program in the headphone or speaker:

* Connect the Program source to the proper pins on the DB-15.

* 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-15.

* 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-15 Accessory Connector on the rear panel. The input is electronically balanced with an input impedance of 10 KOhms. The nominal level should be OdB +/-

10dB.

00

00

@

0

(i)

"ACCESSORY'

CONNECTOR

DB-15F

(Viewed from the rear of the unit)

7

1 5.-

POWER (+30 VDC)

O~~~ND.

PROGRAM

INPUT

8 PROGRAM INPUT

Connecting Program Sources

{)

Clear-Com Intercom Systems1994

Rev. A

0

RM-220 2 Channel Remote Station

21

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-10H Telephone 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 1K ohm load to provide a partial termination.

S

0

0

(i0

"ACCESSORY"'

CONNECTOR

)

DB-15M

0

~~ ~~~~~~~

(Viewed from the rear of the unit)

&

~GNOD1

191

Connecting Party-Line Products As Program Sources

Internal IFB Operation

To use Channel B as an 1113 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 interrupt the program.

©

Clear-Com Intercom Systems 1994

Rev. A

22

RM-220 2 Channel Remote Station

External IFB (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.

Rev. A

POWER

SUPPLY

PS-22

,x4- DIRECTOR

;

'1 | Kll220 ro..E

CHANlExeAl

Snd-4000

CHANNEL 9

PHONE

ASIcSTANT

PHONE JACK

FB 9YiTEiA

||E&220

-

PU

5

TALENT

S

S

R50

l

,PARTY LINE

Typical External 1FB System Using a PIC-4000 and MA-4 with a RM-220

(9)

Clear-Com intercom Systems1994

RM-220 2 Channel Remote Station

23

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 microphone on the ANNOUNCE AUDIO OUTPUT terminals of the ACCESSORY 1/0

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 isolated with a nominal output level of OdB. To connect to the ANNOUNCE output, 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.

"ACCESSORYr

CONNECTOR

DB-15F

0-

12

GND.

3

ANNOUNCE RELAY N.C. CONTACT or_

@

ANNOUNCE RELAY WIPER

-

ANNOUNCE RELAY NO. CONTACT.

GND.

GND.

X

13

-ANNOUNCE AUDIO OUTPUT

*ANNOUNCE AUDIO OUTPUT

Connections for Announce Audio and Relay Outputss

/0

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" button 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, turn up the appropriate control. To not listen to a channel, turn 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 i) Clear-Com Intercom Systems1994

*

RM-220 2 Channel Remote Station

27

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.

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 panel 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

30

Capacitors ... continued

Value

Type

0.47 uF

Aluminum

I uF

Tantalum

1 uF

Aluminum

2.2

4.7

10 uF uF uF

22 uF

47 uF

100 uF

220 uF

1000 uF

10,000 uF

Aluminum

Aluminum

Aluminum

Aluminum

Aluminum

Aluminum

Aluminum

Aluminum

Aluminum

Resistors & Resistor Packs

Value

Power Type

2.2

OHM

10

OHM

22

OHM

39

OHM

1/4

1/4

1/4

1/4

47

OHM 1/4

50

OHM 5

82 OHM

1/4

100

430

OHM

OHM

820

OHM

1K

OHM

1.5K

OHM

1.8K

OHM

2K

OHM

4.7K

OHM

6.2K

OHM

6.81K

OHM

7.5K

OHM

8.2K

OHM

10K

OHM

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Wire Wound

Carbon Film

1/4

1/4

Carbon Film

Carbon Film

1/4

1/4

1/4

1/4

1/4

1/4

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

1/4

1/8

Carbon Film

1/4

Carbon Film

1/4

Carbon Film

1/4

Carbon Film

12K

OHM

15K

OHM

1/4

1/4

Metal Film

Carbon Film

RM-220 2 Channel Remote Station

Volts Tol.

Part #

Designator

50V

150151 C9 C60 C61

35V

20% 150116

C45

50V 10%

150002

C43 C44 C58 C82 C83 C90

50V

150065

C91 C93

C59 C94

50V

35V

150087

C21 C23

50V

1150064 C1

C2

35V

20%

150152

C17 C55 C80

150081

C34 C70

35V

150136

C27

35V

150021 C88

35V

150092 C33

35V

150153

C85

Tol. Part #

Designator

5%

410113

R73 R128 R129

5%

410002 R147

5%

410004

R37 R38 R91 R114

5% 410008

R156 R157

5% 410039

R46 R47 R67

5% 410186

R130

5%

410038

R106

5%

410071

R83 R88

5%

410106

R100 R113 R155

5%

410096

R134 R135

5%

410010

R90

5%

410055 R87

5% 410035

R84

5%

410014

R10 R23 R55 R61 R120

5%

410013

R89 R124

5% 410137

R52 R78

1% 410063

R66 R71

5% 410171

R31 R43

5%

410037

R116

5% 410016

R17 R32 R62 R64 R79 R94

R115 R119 R122 R131

R133 R143

1%

410140

R70 R85 R86 R105

5% 410017

R139 R141

Rev. A

*

RM-220 2 Channel Remote Station

31

Resistors & Resistor Packs ... continued

Value

Power Type

Tol.

Part #

Designator

20K OHM 1/4

Carbon Film

5% 410151 R49 R51 R56 R58 R98 R99

22K OHM

30K OHM

39K

OHM

39.2K OHM

47K

OHM

47.5K OHM

100K OHM

100K OHM

120K OHM

220K OHM

330K OHM

390K OHM

470K OHM

1M OHM

10M OHM

1/8

1/4

1/4

1/8

1/4

1/8

1/4

1/4

1/4

1/4

1/4

1/4

1/4

1/4

1/4

Metal Film

Carbon Film

Carbon Film

Metal Film

Carbon Film

Metal Film

Metal Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

Carbon Film

R125 R126

1%

410157 R72 R117 R118 R123

5% 410090 R140 R142

5% 410019

R132

1% 410111

R76 R77

5% 410021

RS R6 R7 R18 R29 R30 R95

R96 R127 R144 R160

1% 410105

R101 R102 R103 R104

1%

410148 R74 R75

5% 410024 Ri R2 R3 R4 R12 R13 R14

R15 R16 R19 R21 R24 R25

R26 R27 R28 R33 R34 R35

R36 R44 R54 R60 R80 R81

R92 R136

5% 410079 R53 R59

5% 410028 R42 R45 R158 R159

5% 410033

R63 R69

5% 410029

R50 R57

5%

410030 R8 R9 R11 R20 R22 R65

R68 R93

5% 410058 R39 R48

5% 410059

R82 R97

Diodes,Transistors, and Intergrated Circuits

Device

Description

Part #

Designator

1N4003

RECTIFIER, IA 200PIV

480058

D6 D21

IN4148

SIGNAL DIODE, 10MA 75PIV

480000

Dl D2 D4 D7 D8 D9 D10

IN957B

2N5639

4001

4011

4013

4584B

78L15H

DG211

LM833N

LM384

MPS-A13

MPS-A63

RC4559NB

Dll D12 D13 D14 DIS

D16 D17 D18 D19 D20

DIODE, 6.8V ZENER 4W 5%

480026 D3 D5

TRANSISTOR, JFET NCHAN

CMOS DUAL D TYPE FF

480069

Q9 Q10

CMOS QUAD 2 INPUT NOR

480112 IC4 ICS

CMOS QUAD 2 INPUT NAND

480111

IC6

480171

IC2

CMOS HEX SCMITT TRIG

480090

ICI IC3

REGULATOR, NEG. 15V 100MA

480078 IC18

CMOS QUAD ANALOG SWITCH 480092

IC7 IC10

OP AMP, DUAL LOW NOISE

480175 IC12 IC13 IC17

OP AMP, 4W POWER

480012 IC8 IC9

TRANSISTOR, NPN 30V DARL

480004 Q1 Q2 Q3 Q6 Q7 Q8 Q11

TRANSISTOR, PNP 30V DARL

480008 Q4 Q5

OP AMP, DUAL 8 PIN DIP

480056 IC11 IC14 IC15 IC16

©

Clear-Com Intercom Systems 1994

Rev. A

32

RM-220 2 Channel Remote Station

4

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z

01 woz

+ I i

~

9 F

<~~~-

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10

CL.]t/

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U

71-

Rev.

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3

5

~~~~~~~~~~~~~~~~~~~Li~~~~~~~~~-O

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C~~~~~~~~~~

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n~~~~~~~~~w 0.>a

qo

w~~~~~~~~

I~~~~~~~~~~i

Audio Block Diagram for the RM-22

©

Clear-Corn Intercom Systemns'994

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

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