RTS WMS300 Instruction manual

TECHNICAL DATA PACKAGE
TDP3506 / O/N 9300-3506-00
SecondEdition / October 1989
MODELWMS300
WALL MOUNT
SPEAKER
USER STATION
TW INTERCOM SYSTEM
RTS SYSTEMS
1100 West Chestnut Street / Burbank, CA 91506 / Phone (818) 566 - 6700 / FSCM: 60572

TECHNICAL DATA PACKAGE
Model
WMS300 TW Intercom System Wall Mount Speaker User Station
PROPRIETARYNOTICE
The information and design disclosed herein were
originated by and are the property of RTS Systems,
Inc. RTS Systems, Inc. reserves
all patent, propri -
etary design, manufacturing, reproduction, use and
sales rights thereto, and to any article disclosed
therein, except to the extent rights are expressly
granted to others.
COPYRIGHT NOTICE
Copyright 1988by RTS Systems Burbank, California,
USA.
All rights reserved. Reproduction in whole or
in
part without prior written permission from RTS
Systems,orporated
is prohibited.
PATENTNOTICE
The Model
WMS300 contains and uses a design
embodied in United States Patent No. 4,358,644:
" BILATERAL CURRENT SOURCE FOR A
MULTI
- TERMINAL INTERCOM " . This design
employs a bilateral current source operated
as a two-
wire to four - wire converter.
TECHNICAL DATA PACKAGE,
TDP 3506
Model WMS300 TW Intercom SystemWall Mount
SpeakerUser Station
PrintingHistory:
First Edition: September 1983
Second Edition: October 1988
Thrid Edition: August 1989
Fourth Edition: October 1989
Published by the EngineeringDepartment of RTS
Systems, orporated, which is responsible forits
contents.
Written by: Stan Hubler
Lianne SterlingSwanson
Edited by: Sheryl D. Thompson
Address
all communicationregarding this publication
to: Director of Engineering
RTS Systems
1100West Chestnut Street
Burbank, CA 91506 USA.
UNPACKING INFORblATION AND INSPECTION
Immediately upon receipt of the equipment, inspect
the shipping container and the contents carefully for
any discrepancies or damage. Should there be any,
notify the freight company and the dealer at once.
The Model WMS300 shipping container should
contain the following components:
Ordering Number 9000
- 5105 - 00
RTS Systems
QQ Part Number DescriDtion
1 9010 - 5105 - 00 Model
WMS300
1 9300 - 3504 - 00 Technical Data Package
NOTE: Detailed information concerning Theory of
Operation, Maintenance, Spare Parts and System
Interconnection is available in
" The TW Intercom
System Technical Manual
" , which may be obtained
through an RTS Systems Dealer or directly from RTS
Systems.
QUICK TABLE
OF CONTENTS
Unpacking Information
II
Quick Table Of Contents ...................... ii
Warranty ............................................... 111
Shipping Information ......................... iii
Description & Specifications ............ 1 - 1
Installation .......................................... 2 - 1
Operating Instructions ...................... 3-1
Drawings .............................................. 4 - 1
..
........................
...
RTS Systems,Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page ii

TECHNICAL DATA PACKAGE
Model WMS300 TW Intercom System Wall Mount Speaker User Station
RTS SYSTEMS' LIMITEDWARRANTY
The products of RTS Systems are warranted to be
free from defects in materials and workmanshipfor a
period of one year from the date of sale.
RTS Systems's sole obligation during the warranty
period
is to provide, without charge, parts and labor
necessary to remedy covered defects appearing in
products returned prepaid to RTS Systems
1100 W.
Chestnut Street, Burbank, California,
91506, U.SA..
This warranty does not cover any defect, malfunction
or failure caused beyond the control of RTS Systems,
luding unreasonable or negligent operation, abuse,
accident,failureto follow instructionsin the Technical
Manual or the Owner's Manual, defective
or
improper associated equipment, attempts at
modification and repair not authorized by RTS
Systems,
., and shippingdamage. Products with their
serialnumbers removed or effaced
are not covered by
this warranty.
To obtain warranty service, follow the procedures en
-
titled " PROCEDURE FOR RETURNS " and
" SHIPPING TO MANUFACTURER FOR REPAIR
OR ADJUSTMENT
" listed below.
This warranty
is the sole and exclusive express war -
ranty given with respect to RTS Systems 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, LUDING
THE IMPLIED WARRANTY OF MER
-
CHANTABILITY ARE LIMITED TO THE DURA -
TION OF THIS EXPRESS LIMITEDWARRANTY.
NEITHER RTS SYSTEMS NOR THE DEALER
WHO SELLS RTS SYSTEMS' PRODUCTS IS
LIABLEFOR IDENTAL OR CONSEQUENTIAL
DAMAGES OF
ANY KIND.
RETURN SHIPPING INSTRUCTIONS
Procedure For Returns:
If a repair is necessary, contact the dealer where this
unit was purchased.
If repair through the dealer is not possible, phone the
RTS Systems Customer Service Department, located
at the factory, as directed below. They will issue a
ReturnAuthorization Number.
DO NOT
RETURN ANY EOUIPMENT TO THE
FACTORY WITHOUT FIRSTOBTAINING
A
RETURN AUTHORIZATION NUMBER.
Be prepared to provide your company name, address,
phone number, a person to contact regarding the re
-
pair, the type and quantity of equipment,a description
of the problem and the serial number(s).
Questions regarding returns for repair should be
directedto: Customer Service
RTS Systems
1100
W. ChestnutSt.
Burbank CA 91506 USA
Telephone: (818) 566
- 6700
Telex: 191855
Telefax: (818) 843 - 7953
SHIPPING TO MANUFACTURER FOR REPAIR
OR ADJUSTMENT
All shipments of RTS Systems equipment should be
premid via United Parcel Service or the best available
shipper. The equipment should be shipped
in the
original packing carton;
if that is not available, use any
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 hes of excelsior
or similar shock - absorbing
material.
All shipments should be directed to the
attention
of the Order Service Department and must
lude the Return
Authorization Number.
Upon completion
of any repair the equipment will be
returned collect
via United Parcel Service or specified
shipper.
RTS Systems,Burbank,
CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition,October 1089
Page iii

I
TECHNICAL DATA PACKAGE
Model WMS300 TW IntercomSystem Wall Mount Speaker User Station
Figure 1 - 1
TW System Concept Block Diagram
RTS Systems, Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page iv

TECHNICAL DATA PACKAGE
Model
WMS300 TW Intercom System Wall Mount Speaker User Station
SECTION
1: DESCRIPTION & SPECIFICATIONS
1.1 DESCRIPTION
The Model
WMS300, a Wall Mount Speaker User
Station, is a component used in the
TW INTERCOM
SYSTEM.
Each User Station is a communications
unit along a multi-unit conference bus.
The System Concept Block Diagram, Figure
1 - 1,
showsUser Stationinterconnection,and User Station
connectionto the system power supply.
User Stationinterconnection
can be:
1) centrally wired, with each cable coming from a
central point,
or
2) distributed, where all the user stations are
loopedtogether from one to another, or
3) a combination of both. The centrally wired
interconnection not
only reduces interchannel
crosstalk, but
also allows for easier expansion
into an assignablechannel, multi
- channelsystem.
The
WMS300 Block Diagram, Figure 1-5 shows user
station functional components, input/output
connections, and controls. The WMS300 User
Station
has the following
functionalcomponents:
1) a microphone preamplifier with limiter
2) a latching action microphoneon/off switch
3) a momentary actionmicrophone on/off switch
4) a " bilateralcurrent source " line driver
5) a listenvolume control
6) a headphone/speaker amplifer
7) a speaker switch
8) a channelselector switch
The microphone preamplifler/limiter converts the
small microphone signal to a strong line level signal,
conditions the signal strength
so that loud and soft
talkers sound almost the same,and sends the signal to
the lie via the microphone switch and a
" bilateral
current source
" . The bilateral current source adds
signal via the channel select switch to the line without
affecting any signals already
on the line. The bilateral
current source also extracts the listen signal from the
line and sends it to the headphone amplifier via the
volume control. Some of the user's
own voice signal
(
" sidetone " ) is also fed to the headphoneamplifier.
The Channel Selector Switch selects the channel on
which the user will talk and listen. The headphone
amplifier output drives the user's headphones speaker
and the speaker through the on/off switch.
The Volume Control adjusts Listen Level
of the
headphones and speaker. Note: The headphones are
always
" on " ..
The user station voltage regulator takes power from
channel
1, regardless of the channel selector switch
setting (exception: local power option units). The
regulator not only supplies regulated power to the
user station, but also prevents unwanted interaction
between the user station and that intercom line which
is supplying the power. Because the regulator takes
power from channel
1, channel 2 can be expanded
into many channels by using a switch and, for each
channel, a separate wire and a termination network
consisting
of a 200 ohm resistor and a 10 microfarad
capacitor
in series. (See the Application
Diagrams in the TW Intercom SystemsTechnical
Manual). A TW System Power Supply terminates
each channel line with 200 ohms.
1.12 Operational Controls
The WMS300 User Stationhas the followingcontrols,
described and shown
in Section3.1:
1) Channel Select Switch
2) Latching - action MICrophone ON - OFF toggle
3) Momentary - action MICrophone ON - OFF
switch.
pushbutton switch (not standard
with the call -
light option).
(May be a
dual control for the Dual Listen (DL)
Option or the Program (E) Option
Option
( - L)
4) A speaker/headphone VOLUME control
5) CALL LIGHT switch/indicator (Call Light
6) SPeaKeR ON/OFF switch
7) SIDETONE Adjustment
1.13 Connection, Inputs and Outputs
The WMS300 User Station has two inputjoutput con -
nectors described in Section 2.4:
1) DYNamic MICrophonetype HeaDSeT or handset
2) Line INPUT (ties the station to the intercom line)
RTS Systems,Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page 1 - 1

TECHNICAL DATA PACKAGE
Model WMS300 TW Intercom System Wall Mount Speaker User Station
&PIN FEMALE
CO N N ECTOR
I
MUINEL
!3ELECl
2
m
Figure 1 - 2
WMS300 Block Diagram
i
RTS Systems, Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page 1 - 2

TECHNICAL, DATA PACKAGE
Model WMS300 TW Intercom System Wall Mount Speaker User Station
12 MODEL WMS300 SPECIFICATIONS
OVERALL SYSTEM SPECIFICATIONS
Audio Line Voltage, Nominal
AverageSpeechLevel Range
AbsoluteMaximum Speech Level
AudioLine Impedance,Nominal
System DC Line Vol-
Nominal
OperationalRange
Steadystate without damage
Transient
System DC Current
Quiescent (per station)
Dynamic (per station)
Start-up Current
Fault Current
Operating Distances
Maximum DC limit
Maximum AC limit
System Capacitance
1 volt, peak (0 dBm voltage - equivalent)
-20 dBV to - 10 dBV
3 volts, peak (linearlimit)
200 50 ohms, 75 Hz to20kHz
System will continue to operate from 50 ohms to 300 ohms
32volts DC
18 to 35 volts DC
- 1.5 volts to 36 volts DC
200 volts, 8 milliseconds or less (after this time, power supply and
user stationfuses
will open)
10 to 40 milliamps
50 milliamps (w/25 ohm headphones)
70 milliamps (w/25 ohm headphonesand lights)
100 milliamps (w/8 ohm speaker)
1.25 amperes, 50 units, all kinds
4.0 amperes,power supply at voltage > 12volts
1.0 amperes, power supplyat voltage < 12volts
5,000 ft. distance along cable, power supply to single station #22
gaugewire
- DCvoltage drop limitation
10,000 ft. dry pair, power supply at each end, #22 gauge wire
0.3 microfarads (cumulative effect of 10,000 ft. of Maximum cable at
30 picofarads/foot)
RTS Systems,Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition,October 1989
Page
1 - 3

TECHNICAL DATA PACKAGE
Model
WMS300 TW Intercom System Wall Mount Speaker User Station
USER STATIONSPECIFICATIONS
Input DCvoltage:
DC Current
Quiescent
Operating
Impedanceacrossline:
Ambient TemperatureRange
Noise contribution
to
uw) ohm line:
Microphone Preamplifier
Input impedance*
Source Impedance*
Maximum Input Level*
Voltage gain:
Frequency Response
Limiter range
Carbon Mic ExcitationCurrent
*DynamicMicrophoneInput
Current Source
Transfer ratio:
output:
Headphone Amplifier
Overall voltage gain
Overallvoltage gain
Output power:
Frequency Response
Headphone ImpedanceRange
SidetoneAdjustment Range
Call
Light:
Dimensions
20 to 35 volts DC, operatingfrom - 200 to + 36 volts DC without
damage
10to
40 milliamps
50 milliamps, typical (w/25 ohm headphones)
75 milliamps, typical (w/25 ohm headphones
t light)
100milliamps, typical(w/8 ohm speaker)
10,ooO ohms typical; 2,000 ohms worst case dynamic operation
Operating:
0 C to 60 C
Storage:
- 55 C to 125 C
One Unit:
- 75dBu
Ten Unit: - 67 dBu
470 ohms
uw) ohms, nominal
150 millivolts
54 dB
100Hz to 10,ooO Hz, 3dB
50dB
10milliamps, nominal (when optioned for Carbon Mic)
5 milliamps/lS volts
5 milliamps into 200 ohms
24
dB
9 volts peak - to - peak into 25 ohms
Headset station: 1/2 watt into 25 ohms
SpeakerStation:
2 watts into 8 ohms
150Hz to 8,000Hz, 3
dB
25 to 600 ohms
20 dB to full on
SignalingFrequency 20,000 kHz
3 dB
Flashing Rate 5Hz 2Hz
4.5 H x 8.0 W x 1.75 " D
114.3 x 44.5 x 203.2 mm
RTSSystems, Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page 1 - 4

TECHNICALDATA PACKAGE
Model WMS300 TW Intercom System Wall Mount Speaker User Station
For permanent installations it
is recommended that
each channel should have individually shielded twisted
pair of at least
#22 gauge wire, such as
Belden
X8723 for 2 channels. Connect the shield to
system common
but do not tie the shield to chassis,
earth or connectorshell ground.
223 Crosstalk Control
In the TW Intercom System all channels share a
common circuit ground return. Crosstalk due to
common ground resistance
can be lowered by re -
ducing the common ground resistance. Reduction of
ground resistance
can occur as a side benefit of using
shielded cable, since the shield drains can
be tied to -
gether and electrically parallel the circuit ground.
Another way of lowering resistive crosstalk
is to
" homerun " all interconnecting cables to a central or
" home " location. In this configuration, the ground
path is short and the correspondingground resistance
1s small. Crosstalk due to mutual capacitance occurs
when the signal on one wire of a twisted pair couples
into the other wire. Separating the
two conductors
with a shield greatly reduces the capacitive crosstalk.
To reduce both capacitive and resistive crosstalk and
to afford a degree of
RF and electrostatic shielding,
use a cable which has a shielded twisted pair for each
channel. Each pair consists of a conductor for the
channel, a conductor for circuit ground return and a
shield around the
two conductors. The shield is ac -
cessed via a drain conductor. This drain conductor
and the shield
can augment the circuit grounds and
thus lower the ground resistance.
Routing the
TW Intercom System cables along the
same ductways and pathways
as power cabling can in -
creasethe noise and hum levels.
22.4 Moisture / ContaminationProtection
When using equipment in the rain, always protect the
equipment with plastic covers
---- also, make sure all
cable connectors are lifted out of the mud or snow
and protected with plastic bags. Water, mud and
snow in connectors
can cause considerable audible
noise.
225 Hum Prevention
Prevent inducing hum into the system by not locating
user stations near hum sources such as power
transformers, electrical switch panels, lamp dimmers
or TV cameras. When the microphone switch is
turned on, the dynamic microphone acts as a sensitive
antennafor hum sources.
2.4 USER STATION CONNECTIONS
Dynamic Microphone headset connector:
AXR
- 4 - 31type receptacle (Jl)
Input level: - 55 dbu nominal
Output level to headphone:
10 volts peak - to - peak
open circuit.
Pin
1 - Microphonelow
Pin
2 - Microphonehigh
Pin
3 - Headphone low
Pin 4
- Headphone high
Line input connectors: (TB1)
Terminal # 1 - Channel 1
Terminal #2 - Channel 2
Terminal #3 - Channel 3 (3CH option)
Terminal #4
- Ext Power In (LP option)
Terminal
#5 - Common (low side of line)
Terminal
#6 - Common (low side of line)
USM option:
Terminal #4
- USM High
Terminal
#5 - USM Low
RTS Systems,Burbank, CA 91506
/ FSCM: 60572 TDP3506 / Fourth Edition,October 1989
Page 2 - 2

TECHNICAL DATA PACKAGE
Model WMS300 TW Intercom System Wall Mount Speaker User Station
0 0 VOLUUE
I
I d
SIDETONE CHANNEL SPKR MIC
n
TW INTERCOM SYSTEM
USER STATION
YODEL WMSJOO
U \, \ \
\ I
Figure 3 - 1
Model WMS300 Front Panel
RTS Systems, Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page 2 - 3

TECHNICAL DATA PACKAGE
Model WMS300 TW Intercom System Wall Mount Speaker User Station
SECTION 3: OPERATION
3.1 Operating Controls (See Figure 3 - 1)
Table 3 - 1 lists the Model WMS300 operating controls, with reference numbers corresponding to Figure 3 - 1.
Ref No. Name Table
3 - 1
DescriDtion
1 Channel Select Switch Selects one of two channels (standard) or one of three channels
(optional). TheCall Light Option transmitter and receiver operate
on the channelselected by this switch. The CHannel Select Switchis
omitted
in the SingleChannel (SC) option.
2 MIC ON - OFF Toggle A latching - action switch.
3 MIC ON - OFF Pushbutton
A momentary - action pushbutton switch. Not standardwith the Call
4 MIC SWITCH
A momentary MIC switch is located on the optional push - to - talk
Light Option. Turning onthe microphone here also slightly
" dims "
or attenuates the speaker.
microphone and requires that
2) above is ON. The push - to - talk
microphone schematic is included in the speaker station schematic.
5 VOLUME
A speaker/headphone volume control. May be a dual control for
the Dual Listen (DL) or Program (E) Option.
CAUTION ALWAYS TURN THIS CONTROLALL THE WAY COUNTERCLOCKWISE (TO THE LEFT)
BEFORE PLUGGING IN THE HEADSET.
6 CALL Light
Switch Indicator
7 SPeaKeR ON/OFF
8 SIDETONE
This switch/indicator appears only on the user stationswith the
" CallLight " option. When the CALL Switch is depressed, a 20
kilohertz signalis added to the TW intercom line on the same
channel that the CHannel Select Switch has been set. This signal
activates the Call Light receiver
on all user stationswhich are
switchedto the same channel.
This switch turns on the speaker.
The screwdriver
- adjusted SIDETONEcontrol sets the " sidetone "
level during headset operation and sets the " balance " nulling during
speaker/panel microphone operation.
RTS Systems,Burbank, CA
91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page 3 - 1

TECHNICAL DATA PACKAGE
Model
WMS300 TW Intercom System Wall Mount Speaker User Station
SECTION
3: OPERATION
3.1 Operating Controls (See Figure 3 - 1) (continued)
To adjust the SIDETONEcontrol for speaker operation:
1) turn ON the SPeaKeRswitch,
2) turn ON the h4ICrophone switch,
3) set the VOLUME control to about 50%,
4) plug in a microphone
5) hum into the microphoneand adjust SIDETONE for minimum sound through the loudspeaker.
Toadjust the SIDETONE controlfor headset operation:
1) turn OFF the SPeaKeR switch,
2) turn ON the MICrophoone switch,and
3) plug in a headset,
4) set the VOLUME control to about 50%,
5) turn the SIDETONE control My counterclockwise, the adjust it clockwise for a comfortablelevel of
your
own voice while talking into the headset microphone.
RTS Systems,Burbank, CA 91506 / FSCM: 60572 TDP3506 / Fourth Edition, October 1989
Page 3 - 2

TECHNICAL DATA PACKAGE
Model WMS300 TW Intercom System Rack Mount Speaker User Station
SECTION 4 DRAWINGS
Model WMS300
RTS Svstems
Document
Number
ID3211
AS2424
SD2387
SD2387
SD3487
WD5079
WD5079
WD5079
WD5079
- Title Page
InstallationDrawing, WMS3OO Speaker Station ............................................................. 1 - 5
Assembly Diagram, CC303 ................................................................................................ 4 - 2
SchematicDiagram, WMS3OO/WMS3OO-L, sheet 1 of 2 ........ ; ...................................... 4 - 3
SchematicDiagram, WMS3OO/WMS3OO-L, sheet 2 of 2 ............................................... 4-4
ServicingDiagram, Light SignalingCircuit Cc28 ........................................................... 4 - 5
Wiring Diagram, WMS3OO/WMS3OO-L, 2nd Generation, sheet 1 of 4 ....................... 4 - 6
Wiring Diagram, WMS3OO/WMS3OO-L, 2nd Generation, sheet 3 of 4 ....................... 4.8
Wiriig Diagram, WMS3OO/WMS3OO-L, 2nd Generation, sheet 2 of ........................ 4 - 7
Wiring Diagram, WMS3OO/WMS3OO-L, 2nd Generation, sheet 4 of 4 ....................... 4 - 9
RTS Systems Burbank, CA 91506 / FSCM: 60572 TDP3506 / Third Edition,August 1989
Page 4 - 1

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TECHNICAL DATA PACKAGE
Model WMS300 TW Intercom SystemRack Mount Speaker User Station
C L 305 BOARD
I- -
--- ------
RTSO 1911-0036-00
TO CC 303
I
PC BOAHU
L& LICOA1 SWIlCHES ARE USED IN CKDEH REVISIOAI
WM5300 WITS.
AM JUMPER TO
ClRCUlT SlDE,MOMENTARI MIC UNlU ONLY.
4. SEE SD23gl FOR SCHEMATIC.
CUT TRACE
MI COMWTENT SIDE,MOMENTARY MIC UNlTJ ONLY (2 PLACES).
I
I
MISTALL CI,RI,R3,R(. FROM CIRCUIT SIDE.
I
1 FROM CC-28 PCB.
LICON 05-115
I
(- L UNITS ONLY)
RTS Systems Burbank,CA 91506 / FSCM: 60572 TDP3506 / Third Edition, Augt~sl IOXO
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