Clear-Com RM-220 Remote Station

RM-220
2-CHANNEL REMOTE STATION
INSTRUCTION
and
SERVICE MANUAL
zIIi4IIMI~
ClearCor
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.
3
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."
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
Authorization Number.
Return
0
© 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
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 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.
{) 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
7
RM-220 2 Channel Remote Station
"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 -------------------------Frequency Response: ------------------------
1 KOhms
55 dBv- nominal
250 Hz to 12 KHz, contoured
-
-
for intelligibility.
Gain from Headset to Intercom Line:
--------
+41 dB
PANEL MICROPHONE PRE-AMP:
Input Level --------------------------Frequency Response: ---------
45 dBv' nominal
250 Hz to 12 KHz, contoured
Gain from Panel Mic to Intercom Line: --
for intelligibility.
+31 dB (adjustable)
SPEAKER AMPLIFIER:
Load Impedance: ---------------------Output Level: -----------------Distortion: ------------------Frequency Response: -----------------------------
16 Ohms
at least 4 watts
<0.2% THD at 1 KHz
200-18KHz +/-2dB
HEADPHONE AMPLIFIER:
Load Impedance: ------------Output Level: -----------------------
----- greater than 50 Ohms
at least +20 dBv across 600
ohm
Distortion:
-----------------------Frequency Response:
-------Gain from Intercom Line:
--------------
<0.2% THD at 1 KHz
200-18KHz +/-2dB
+37 dB
PROGRAM INPUT:
Input Level Ref.: --------------------------- -10 dBv*
Input Impedance: ----------------- >40 KOhms
Frequency Response: -------150 Hz to 15 KHz
©)Clear-Com
Interoom Systems 1994
Rev. A
8
RM-220 2Channel Remote Station
INTERCOM LINE DRIVE/RECEIVE CIRCUITS:
---------> 10 KOhms (200Hz - 10 KHz)
Impedance, Output Load: -
-9 dBv (nominal) +5dBv (max
before clip)
Sidetone Null Capability: ----------------------- > 25 dB (200Hz - 10 KHz)
Crosstalk, Station induced Ch. to Ch.: -------- >60 dB
>60 dB
Noise, SN Ratio in Listen Channels: ----------------
Level, Line (200 ohm load): -
LINE LEVEL OUTPUTS:
SA (Announce)
-----------------Type -----Impedance --------------------Level ------------------------IFB/HOT MIC:
-------------------------Type
Impedance -----------------Level -----------------------------
Balanced
600 ohms
0 dBv
Unbalanced
600 ohms
0 dBv
STANDARD CLEAR-COM SYSTEM SPECIFICATIONS:
> 100 Stations
Usable Line Quality: --------------------Total Line Length on One Channel ------------- > 5000 feet
CONNECTORS:
--------------Intercom: --------------------------------Accessory
Program Input
SA output
Foot Switch Logic Inputs
----------IFB/HOT MIC. ---------------
4 XLR-3 (2-CH A, 2-CH B)
DB-15F
1/4 inch Phone Jack
POWER REQUIREMENTS:
--------------------------------- Intercom Line
Source --------- 20 - 30 VDC
-------------------Voltage --65 mA idle, 120 mA average
---------------Current ----
PHYSICAL SPECIFICATIONS:
Dimensions: ---- ----- ------
------19"W
-------------------Weight:
Operating Temperature Range: ---------------
*
x 1.75"H x 7..OD
(483mm x 44.5mm x 178mm)
3.6 lbs (1.6 Kg)
32-122° F (0-50° 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 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.
©x 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 REMOTE 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
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
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
© 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 ClearCorn'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-ISP
1>
9
2
a
10
b
f
3
(
4
12
a
1(3
a
6
7
(3
a
FOOT SWITCH COMMON
FOOT SWITCH 'E'
FOOTSWITCH A'
GND.
ANNOUNCE RELAY N.C. CONTACT
ANNOUNCE RELAY WIPER
ANNOUNCE RELAY N.O. CONTACT.
GND.
AUDIO OUTPUT
+ANNOUNCE AUDIO OUTPUT
POWER (+30 VD)C)
GND.
- PROGRAM INPUT
+ PROGRAM INPUT
- ANNOUNCE
Viewed from the rear of the connector
0
Rev. A
i) Clear-Corn intercom Systemsl 994
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 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
a.
CO
1
2
3
4
5
6
7
8
MOMENTARY ONLY TALK SW "A"
-- MOMENTARY ONLY TALK SW "B"
-- AUTO CALL SIGNAL ON CHAN. "A"
-- AUTO CALL SIGNAL ON CHAN. "B"
-- ANNOUNCE TALK INTERRUPT ENABLE
-IFB TALK INTERRUPT ENABLE
-- PROGRAM FEED ENABLE CHAN. "B"
-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
RM-220 2Channel 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 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.
.
d124--C==3
-
i
-
-
-2-- --
-
:
-
_
-_D
el
-l--3
-
A--
1RIZZ
R12
KI
1
=Ihl~~~~T
3
-4---
--
-
-
*
GAIN ADJUST
Location of Panel Mic Gain Adjust Control R154
0
Rev. A
©
Clear-Corn intercom Sysstemsl994
15
RM-220 2 Channel Remote Station
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.
JUMPER SETTINGS
0
MD 0
CHBE
0
<200 FT
~~~~~~>200
FT
<700 FT
>700 FT
0
0~~~~~
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.
INTERFACE
ENGINEER
DIRECTOR
POWER
SUPPLY
CAMERA
ASST. DIRECTOR/
OPERATOR
FLOOR MANAGER
B
lii]
TELCO
LINE
RS-501
RS-501
P-22
TEL-1O00
RM-220
RM-220
E
50:
CHANNEL A
TALENT
ANNOUNCER
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
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
L
RM-220
-220
MR2
T
T
SN
rod
rub WURjW-102
rod
rod
RS-601
GRAPHICS
VIDEO
MR-R
FLOOR MANANCERS
CANCERA
RS-__
MR-10Z
_
RS-601
RS-6W-
RS-5TR
PRNOGORAM"
CHANNEL A
FROM
STA`NON:
TALENT
|T15TR-50
PRODE'_
UK
PAGINGSPK
IN STUDIO
ANNOUNCER
SIXER/^MP CHANNEL
a
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
RM-220 2Channel 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 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:
Rev. A
*
*
Pin 1 -
*
Pin 3 --- Audio
Ground (Shield)
Pin 2 --- Power (+20 to +30 VDC)
i Clear-Com Intercom Systems1994
19
RM-220 2 Channel Remote Station
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
3
D
br5
FS
|i
____
rRM-220/GM
L
3
{STACES.
|
|barFa
Lt
WA~~~~~O
I
_
{'~
.3L;
"
Heodse
P_22I
PROGRAM
INPUT
~~
&A
1-43 x P.
l I ~~~~~~~~~~~I
|
|
tH~o
H
Hf..|L>ds....TL.......
e
FLOOR MANAGERS
_
_
i
7
| U-RF=_
3C
CAMERAS
12
GRAPHICS
VIDEO
| U-12 |
F=L . ,|M
H)&220/GUM
T.
TOgdseTTT
tNlH
_
r
Hea-22tHC
CHANNEL A
TALENT
FROM
STAONUT
SA OUTPUTS
ANNOUNCER
CCNNECI1ON CODES
_
_
3:
l
PROVCEDBY USER
PACING
CANL9N
CHANNEL B
_
'5 0-1N
5
E,
SPEAXER
_
PiceY
L~~~J
Ec Pt
~H
_
_
_
_
_
_
_
_
_
_
_
_
_
_
.:3PIN 'X~r
LR
1/4-I/ STEREO PHONE PLUG (TGn/~~E
C - T/8 MONO PHONE PLUG (nTI/SLEEE)
- SCEW
TERMAINALS
W * AC POWERCORD
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
RM-220 2Channel 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 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
"ACCESSORY'
CONNECTOR
DB-15F
@
(Viewed from the rear of the unit)
(i)
POWER (+30 VDC)
7
O~~~ND.
15.-
PROGRAM INPUT
8 PROGRAM INPUT
Connecting Program Sources
Rev. A
{)Clear-Com Intercom Systems1994
0
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-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.
0
"ACCESSORY"'
CONNECTOR
)
DB-15M
0
(i0
S
(Viewed from the rear of the unit)
0 ~~
&
~~~~~~~
POWER (+30 VDC)
~GNOD1
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.
191
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.
DIRECTOR
,x4-
FB
'1 | Kll220 ro..E
;
CHANlExeAl
CHANNEL
R/4PHONE
POWER
SUPPLY
PHONE JACK
9YiTEiA
Snd-4000
9
gTX-50
ASIcSTANT
LINE
PRT
TO ADDITIONALLON
DIRECTORX
PU
-
S
l
5
TALENT
PS-22
||E&220
S
R50
TO
ADDMONAL
LINE
,PARTY
Typical External 1FB System Using a PIC-4000 and MA-4 with a RM-220
Rev. A
(9) 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 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
03
or_
(4e-___12
13
X
@
GND.
ANNOUNCE RELAY N.C. CONTACT
ANNOUNCE RELAY WIPER
ANNOUNCE RELAY NO. CONTACT.
GND.
GND.
-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
RM-220 2 Channel Remote Station
Capacitors ... continued
Value
Type
Volts
0.47
I
1
uF
uF
uF
Aluminum
Tantalum
Aluminum
50V
35V
50V
2.2
4.7
10
22
47
100
220
1000
10,000
uF
uF
uF
uF
uF
uF
uF
uF
uF
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
50V
50V
50V
35V
35V
35V
35V
35V
35V
Tol.
Part #
Designator
20%
10%
150151
150116
150002
150065
150087
1150064
150152
150081
150136
150021
150092
150153
C9 C60 C61
C45
C43 C44 C58 C82 C83 C90
C91 C93
C59 C94
C21 C23
C1 C2
C17 C55 C80
C34 C70
C27
C88
C33
C85
Tol.
Part #
Designator
R73 R128 R129
R147
R37 R38 R91 R114
R156 R157
R46 R47 R67
R130
R106
R83 R88
R100 R113 R155
R134 R135
R90
R87
R84
R10 R23 R55 R61 R120
R89 R124
R52 R78
R66 R71
R31 R43
R116
R17 R32 R62 R64 R79 R94
R115 R119 R122 R131
R133 R143
R70 R85 R86 R105
R139 R141
20%
Resistors & Resistor Packs
Power Type
Value
2.2
10
22
39
47
50
82
100
430
820
1K
1.5K
1.8K
2K
4.7K
6.2K
6.81K
7.5K
8.2K
10K
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
OHM
1/4
1/4
1/4
1/4
1/4
5
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/8
1/4
1/4
1/4
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Wire Wound
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
Carbon Film
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
1%
5%
5%
5%
410113
410002
410004
410008
410039
410186
410038
410071
410106
410096
410010
410055
410035
410014
410013
410137
410063
410171
410037
410016
12K
15K
OHM
OHM
1/4
1/4
Metal Film
Carbon Film
1%
5%
410140
410017
Rev. A
©)Clear-Com Intercom
Systemsl9Q4
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
22K
30K
39K
39.2K
47K
OHM
OHM
OHM
OHM
OHM
1/8
1/4
1/4
1/8
1/4
Metal Film
Carbon Film
Carbon Film
Metal Film
Carbon Film
1%
5%
5%
1%
5%
410157
410090
410019
410111
410021
47.5K OHM
100K OHM
100K OHM
1/8
1/4
1/4
Metal Film
Metal Film
Carbon Film
1%
1%
5%
410105
410148
410024
120K
220K
330K
390K
470K
OHM
OHM
OHM
OHM
OHM
1/4
1/4
1/4
1/4
1/4
Carbon
Carbon
Carbon
Carbon
Carbon
5%
5%
5%
5%
5%
410079
410028
410033
410029
410030
1M
10M
OHM
OHM
1/4
1/4
Carbon Film
Carbon Film
5%
5%
410058
410059
R49 R51 R56 R58 R98 R99
R125 R126
R72 R117 R118 R123
R140 R142
R132
R76 R77
RS R6 R7 R18 R29 R30 R95
R96 R127 R144 R160
R101 R102 R103 R104
R74 R75
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
R53 R59
R42 R45 R158 R159
R63 R69
R50 R57
R8 R9 R11 R20 R22 R65
R68 R93
R39 R48
R82 R97
Film
Film
Film
Film
Film
Diodes,Transistors, and Intergrated Circuits
Device
Description
Part #
Designator
1N4003
IN4148
RECTIFIER, IA 200PIV
SIGNAL DIODE, 10MA 75PIV
480058
480000
IN957B
2N5639
4001
4011
4013
4584B
78L15H
DG211
LM833N
LM384
MPS-A13
MPS-A63
RC4559NB
DIODE, 6.8V ZENER 4W 5%
TRANSISTOR, JFET NCHAN
CMOS QUAD 2 INPUT NOR
CMOS QUAD 2 INPUT NAND
CMOS DUAL D TYPE FF
CMOS HEX SCMITT TRIG
REGULATOR, NEG. 15V 100MA
CMOS QUAD ANALOG SWITCH
OP AMP, DUAL LOW NOISE
OP AMP, 4W POWER
TRANSISTOR, NPN 30V DARL
TRANSISTOR, PNP 30V DARL
OP AMP, DUAL 8 PIN DIP
480026
480069
480112
480111
480171
480090
480078
480092
480175
480012
480004
480008
480056
D6 D21
Dl D2 D4 D7 D8 D9 D10
Dll D12 D13 D14 DIS
D16 D17 D18 D19 D20
D3 D5
Q9 Q10
IC4 ICS
IC6
IC2
ICI IC3
IC18
IC7 IC10
IC12 IC13 IC17
IC8 IC9
Q1 Q2 Q3 Q6 Q7 Q8 Q11
Q4 Q5
IC11 IC14 IC15 IC16
© Clear-Com Intercom Systems 1994
Rev. A
32
RM-220 2 Channel Remote Station
4
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Audio Block Diagram for the RM-22
Rev. A
© Clear-Corn Intercom Systemns'994
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