RTS BP300 User manual

User Manual
MODEL BP-300
Portable Belt Pack User Station
9350-1786-00 Rev H 09/2006

PROPRIETARY NOTICE
The product information and design disclosed herein were originated by
and are the property of Telex Communications, Inc. Telex reserves all
patent, proprietary 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 2006 by Telex Communications, Inc. All rights reserved.
Reproduction, in whole or in part, without prior written permission from
Telex is prohibited.
WARRANTY NOTICE
See the enclosed warranty card for further details.
CUSTOMER SUPPORT
Technical questions should be directed to:
Customer Service Department
RTS/Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, MN 55337 USA
Telephone: [phone]
Fax: [phone]
Factory Service: 800-553-5992
RETURN SHIPPING INSTRUCTIONS
Customer Service Department
Telex Communications, Inc. (Lincoln, NE)
Telephone: [phone]
Fax: [phone]
Factory Service: 800-553-5992
Please include a note in the box which supplies the company name,
address, phone number, a person to contact regarding the repair, the type
and quantity of equipment, a description of the problem and the serial
number(s).
SHIPPING TO THE MANUFACTURER
All shipments of product should be made via UPS Ground, prepaid (you
may request from Factory Service a different shipment method). Any
shipment upgrades will be paid by the customer. The equipment should
be shipped in the original packing carton. If the original carton 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 (4) inches of excelsior or similar
shock-absorbing material. All shipments must be sent to the following
address and must include the Proof of Purchase for warranty repair.
Upon completion of any repair the equipment will be returned via
United Parcel Service or specified shipper, collect.
Factory Service Department
Telex Communications, Inc.
8601 East Cornhusker Hwy.
Lincoln, NE 68507 U.S.A.
Attn: Service

TABLE OF CONTENTS
. .
PROPRIETARYNOTICE .................................................... 2
COPYRIGHTNOTICE
..................................................... 2
........................................................
PATENTNOTICE 2
...............................................
UNPACKING AND INSPECTION 2
.................................................
WARRANmIWORMATION 2
............................................
RETURN SHlPPING INSTRUCTIONS 2
SECTION 1: DESCRIPTIONAND SPECIFICATIONS .................................. 5
1.1DESCRIFTON ....................................................... 5
.....................................................
1.3 SPECIFICAlIONS 6
SECTION2.INSTALLATION ................................................ 7
2.1 POWER REQUlREMENTS. TYPEOFSYSTEM. POWERINGMETHOD AND POWER SUPPLY (IES)
...... 7
...................................................
2.2 TYPEOFMOUNTING 7
..................................................
2.3 CHOOSING HEADSETS 8
2.4CABLINGREQULREMENTS ............................................... 9
2.4.1 WIRESIZEAND MAXIMUM OPERATING DISTANCE ............................ 9
2.5MECHANICAL ....................................................... 10
2.6SYSTEMCHECK
...................................................... 10
2.7 STANDARD
USER STATIONCONNECTIONS ..................................... 10
..................................................
SECTION3.OPERATION 13
3.1 OPERATING CONTROLS AND CONNECTORS .................................... 13
3.2 OPERATION ........................................................ 13
SECTION 4: REPLACEMENTPARTS ........................................... 15
4.1 WHERE TO OBTAIN PARTS ............................................... 15
4.2 MECHANICALPARTS ................................................... 15
4.3 ELECTRICAL PARTS ................................................... 15
SECTION 5: DIAGRAMS 1 DRAWINGS .......................................... 19

MICROPHONE
Page 4

0
SECTION 1: DESCRIPTION & SPECIFICATIONS
1.1 DESCRIPTION
The Model BP300 is a portable, two-channel inter-
com user station. The user station is designed to be
used in a full duplex, conference line intercom sys-
tem.
Conference LineIntercom Svstem (Figure 1-1)
A conference line intercom system allows a group
of people to talk and listen on a single channel.
On this channel, all users can listen when one or
more other users are talking (conferencing). Up
to
75 users can sharethesame conferenceline (or
conferencebus).
Full duplexoperation allowstwoway conversation
at the same time, that is, oneuser can interrupt a
seconduserwhiletheseconduser is stilltalking.
The BP300, with a headset, interfaces a human user
3
to the intercom system. The user talks and listens
using the headset (or a handset). The headset con-
nects to the BP300 via a four conductor cable and
connector (optionally five or six pin). The BP300
connects to the system using a three conductor
"microphone" type cable. The BP300 contains four
controls: the volume control, the latching micro-
phone switch, the momentary microphone switch,
and the channel select switch. On the Model
BP300L, the momentary microphone switch is re-
placed with thecalllight button.
VolumeControl
Thevolume control on the BP300 has
a wide range
to compensate for: user hearing differences, ambi-
ent noise variation, variations in headset
/ handset
sensitivity, and variations in voices. The volume
control in the BP300 reduces distortion by driving
the headphone amplifieronly
as much asneeded.
Microphone Switch(es1
In normal system operation, one or more users talk
and the others listen.
A microphone switch on each
station allows thetalker's microphone to
be enabled
and allows the listeners to keep their microphones
disabled. In this condition,speech intelligibility is en-
hanced since background noise from other micro-
() phones isnot present.
Ll'
On the Model BP300, a latching switch or momentary
push button turnsthemicrophoneon.
The momentaty push button allows quick 'bursts of
communication,especiallyuseful in a high noise envi-
ronment. The latched position allows "hands freen
operation, when the user needs to have two way
conversation while performing another activity.
The Channel Select Switch
A channel selector switch allows a choice of two
(optionally three) channels. When the switch is on
the
"1" position the station talks and listens on chan-
nel
1, on the "2"position, channel 2, and so on. On
larger systems the "1" position may be any system
channel (1through 12for example). Similarly, for
position
"2". See Section 2.1 for DC powering re-
quirementsunderthese conditions.
Call Light Push Button (BP300L, only)
Pushing this button transmits a call signalto all other
units on the channel selectedby the channel selector
switch.
A call signalonthischannelwill causethecall
light push button to flash. The flash rate is 2 to
5
times a second. The call signal itself is a 20 kilohertz
signal.
Options(-DL,
-E, -3CH, -USMB, -LP)
The BP300 and BP3OOL use the CC33 card
except as
indicated below. Codes at the end of each aragraph
indicate the card used. Codes are: *CC33 car$ **CC4O
card, ***CC45 card. (CC33 schematic is SD1464;
CC40/CC45schematicis SD1427).
-DL: Dual Listen on two channels. The volume control is
changed to
a dual concentricpotentiometer with two knobs.
Thechannelselectswitch routesthe
talk signal. The outside
knob follows the channel selector. The inside knob is the
non-talk,listen only channel.
-E: Program Input, balanced. Deletes line loop-through,
the balanced program is fed in instead. Pins 2
and 3are the
input connections.
A dual concentric potentiometer with
two knobs provides separatelevel controlsfor interwm
and
program.
-3CII: Three CHannel operation. Line and loop-through
connectors are changed to 4-pin from 3-pin. A 3-position
channel select switch replacesthe 2-positionswitch.
-USMB: UnSwitched Microphone output, Balanced.
Deletes line loop-through. Level: -7dBm to S3dBm. The
USMB provides a line level microphone signal to other
systems such
as an Interrupted Feedback System (IFB),
telephone,radiotelephone,or StageAnnounce.
-LP:
Local Power source.A small module converts AC line
power to low volta e to wer the user station,
a separate
connector
is provib;d. #e unit does not use power from
the interwmline.
Page
5

1.3 BP300 SPECIFICATIONS
InputDCVoltage
TWMode
18 to35volts DC
LP Option 15to35voltsDC
Battery 12to 35voltsDC (reduced
performance)
DCCurrentDrawn from
TW Line (Note:LP Option draws
no currentfrom
TW line)
Quiescent
BP300 23 milliamperes 210%
BP3OOL 33milliamperes 210%
Operating,25 ohm headphones
BP300 37milliamperes
2 10%
BP3OOL 45 milliamperes 210%
Operating,25 ohm headphones
+ Call Light
BP300L 60milliamperes
f 10%
ImpedanceAcross Line 10,000ohms, minimum
Environmental
Temperature
Operating 0.C to 60°C
Storage
- 40°C to 85°C
Humidity
Operating
& Storage
5% to 95% non-condensing
Noise Contribution
Oneunit -75 dBu
Ten units: -67dBu
MicrophonePreamplifier
Input Impedance 470 ohmsldynamicmic
SourceImpedance 200 ohms, nominal
Maximum InputLevel 150millivolts
Fre uency Response 100hertz to 10kilohertz k3dB
q-54 dBu input)
Limiter Range 30 dB
Carbon Mic
ExcitationCurrent 10milliamperes,nominal
Current Source
Transfer Ratio 3.3 milliamperes
/ volt
= 3.3 millislemens
Output
A 5milliamperesinto 200 ohms
= -c 1 volt peak, nominal
I-leadphoneAmplifier
VoltageGain 34 dB
OutputVoltage 8voltspeak-to-peakinto25
Cl
OutputPower 112watt peak into25 ohms
FrequencyResponse 150hertz to 8kilohertz
-t 3 dB
Headphone
ImpedanceRange 25 to 600 ohms (600 to 2000 with
reduced levels)
NOTE: DONOT USE HEADPHONES
WITH
IMPEDANCES LESSTHAN 25 OHMS.
Sidetone
AdjustmentRange
- 20 dBto full on
Call-Light
SignalingFrequency 20,000 hertz
f 100hertz
FlashingRate 5hertz
A 2 hertz
Auxiliarv Connections
Headset Connector
DynamicMicrophone XLR
type 4-pin female
CarbonMicrophone 114"standard phonejack,
3 circuit
Line Connections
Input XLR type3-pinfemale
Loop/External XLR type 3-pinmale
Mechanical
Dimensions 6.00
H x 3.50 W x 1.75 D inches
152.4
H x 88.9 W x 44.5 D,millimeters
Weight 1.0 pounds, 0.45 kilograms
Finish Clear, anodized aluminum
SPECIFICATIONNOTES:
0 dBu
= 0.775volts rms.
0 dBm
= 1 milliwatt = 0.775 volts rms. into600ohm load
(0 dBu,open circuit)
Note: All products and specifications subject to
changewithout notice.
Pagc
6

lo
SECTION 2: INSTALLATION
I
Followthedirections: "ToInstall the BP300n,below.
2.1 Power Requirements, Type Of System, Powering
MethodAnd Power Supply(ies)
I
Power Requirements
Tomaintain abridging 10,000ohmsimpedancetothe
intercom line, the BP300 requires +18 to +35 volts
DC. To operatein local power or battery modes, the
BP300 requires from +15 to +35 volts DC, but is
operable at reduced performancefrom +12 to
+ 17.9
volts. Below that voltage, a safetycircuit disablesthe
microphoneswitchon the CC33board.
Tweof System
TheBP300 can be installedin a (1) three wire system,
(2) twowire system,or (3)specialtwo wire system.
power in^ Method
Power is carried to the unit from a system power
supplyusingthree different methods:
(1) In a three wire system ("Series 17ntype), the
power is separate from the audio and supplied
by a centralpower supply.
(2) In
a twowire system ("TW-e), thepower and
audio may share the same wire. The power is
supplied centrally by a special "TW" type power
supply-
(3) Ina specialtwo wire system (LocalPower),each
BP300 islocallypowered and operateson switch
channel two. The BP300s are interconnected
using two wire cable. Power is suppliedby abat-
tery or a local power supply. The local power
supplyshouldbe isolated from earthground.
In (1) above, the power supplyis a regulated supply,
24 volts DCto 32volts DC, 1.5 amperes. Thissupply
can operate up to 50 BP300 and 30 BP300Luser sta-
tions.
For case (2) above, assuming the currents shown, the
power supplies versus maximum number of stations
powered are:
Power Supply BP300 (37mA) BP300L (60mA)
Model
PS8 (j.43AI 11 7
Model PSI5 1.OA 27 16
ModelPS3l 1.5A 41 25
N&: Operaiwn of a system at maxitnutn load docs not
allow for other variations such as lemnperaturc, litw
voltage, cable resistartce, and surges.
A more prudent
approacli is
to operate ti= system at no more than 80% of
capacity.
In (3) above, a local power supply provides 12to 24
volts DC at 120 milliamperes peak for each station,
or, for remote single station operation, two 9-volt
batteriesin seriesmay
be used.
In (1) and (3) above,the two wires carrying the audio
requlre one system termination consisting of a
200
ohm resistor and a 100microfarad capacitor in series.
This combination is connected across the two wires.
If the capacitor is polarized, its negative terminal is
connectedto thesystemcircuitcommon.
To InstalltheBP300:
1. Determinethetype of system in which the BP300
istobe installed.Determinethepowering
method and power supply(ies).
2. Determinethemountingof theBP300: Portable
or Permanent.
3. Read "ChoosingHeadsetsorHandsets".
4. Determinethe cablingrequirements.
5. Createa systemblock diagram
& equipmentlist
(if not alreadyavailable),then installthesystem.
6. Verify correct systemoperation by using the
checkout procedurein this chapter (02.6).
Update the system block diagram, equipment list
and any otherdocumentationtoreflect the
"as in-
stal1ed"configuration. If the system block dia-
gram was originally createdby
RTS Systems,send
a copy of the
"as installednsystem block diagram
to RTS Systems. Thisdiagramwill be usedtoup-
date the original documentation, and for future
servicesupport.
2.2 Type Of Mounting
(1) Onetype of mounting for the BP300 is portable,
when it isworn on clothingor an equipmentbelt.
(2) Another type of mounting for the BP300 is
permanent or semi-permanent, either
a "desk
mountn (sitting on a desk) or fastened to fur-
niture. Avoid placing the BP300 on a metal or
grounded metal surface. Contact between the
Model BP300 and metal surfaces may cause
unwanted noises on the intercom line.
Page 7

23 ChoosingIIeadscts
Introduction Headset or handset choice depends on
operating environment, operating requirements, and
personaltaste.
OperatingEnvironmentTable2-1shows typical oper-
ating environments and the amount of background
noisepresent.
A very quiet operating environment, such as a
television studio, may require that sound does not
leak from the headphones, meaning the headphones
shouldhave good "acousticisolation".
A very noisy or loud environment usually requires
headphones that prevent outside sound from leaking
in (again, good acoustic isolation), headphones that
can produce a loud, clear sound, and noise cancelling
microphones,
as well.
Understanding speech in a noisy environment re-
quiresthat the sound fromthe headphonesis as loud
orlouder than the soundleaking into the headphones
fromthenoisy environment.
Loudness In general, the loudness of a headphone
depends upon its ability to absorb power at a given
voltage (impedance) and the efficiency of its design.
Practically, the impedance has a larger effect with
present dayheadsets.
Impedance Low impedance headphones are louder,
causing the BP300 to draw more current from the
power supply. High impedance headphones are not
as loud, drawing less current from the power supply.
The BP300 design range of impedances for the head-
phone
part of the headset is 25 ohms to 600 ohms.
Headphone impedances 600 to 2000 ohmswill oper-
ate at reduced levels. In a double muff headset such
as the Beyer DT109 sold by RTS Systems, there are
50 ohm headphonesconnected in parallel resulting in
an impedanceof 25 ohms.
Efficiencv The BP300 produces the loudest sound in
low impedance headphones such as the DT109. In
this headphone, one milliwatt of electrical power
produces
94 dB SPL(SoundPressureLevel).
Practical Loudness The BP300
/ BP300L can pro-
duce an SPL of
111 dB in each ear of a DT109 or
DT108 headset. Low impedance headsetssuch
as the
DT108 and DT109 headsets, cause the BP300
/
BP300L to require more power from the power sup-
ply. With DT109 headsets, BP300 peak current is 75
milliamperes. BP300L peak current is
80 milliamperes. With 600 ohm headphones, peak
current is 30 milliamperes for the BP300,
40 milliamperes for the BP300L. (Quiescent current
is 23milliamperesfor the BP300,33 milliamperes for
the BP300L).
HeadphoneSound Isolation
The abilityof headphones to shut out unwanted envi-
ronmental noise varies from none (0 dB isolation) to
about 118th as loud (30 dB isolation). The degree of
isolation depends both on the design of the headset
and the frequency content of the environmental
noise. Lightweight, "open" headsets such as the RTS
Systems LH267 (single muff) and LH268 (double
muff), have almost no (0 dB) isolation. The trade-off
is that the LH267LH268 are very comfortable and
can be worn forlong periods (8 to 12hours) without
physical discomfort from the earmuffs or headband.
The LH267LH268 are low impedance and can be
turned up loud.
Because there is less acoustic isolation, care must be
taken that the sound signals from the LH267LH268
arenot unintentionally leaked into microphones.
The DT108PT109 headsets have an isolation rang-
ingfrom 10dBto20 dB.
At least four companies,Telex, Setcom, David Clark,
and Carter Engineering sell headsets intended for
heavy industrial, aerospace, and military markets.
These headsets can provide acousticisolation figures
of 20dB to 40dB. Generally speaking, these headsets
are heavier and lesscomfortabletowear.
Isolation,Headset Microvhones
In high noise environments, the headset microphone
shouldbe a noise cancellingtype.
Comfort In general,the comfort of headsets depends
upon their weight,padding and design.
Inthe headset connectingcable,prevent couplingbe-
tween the microphone and headphone leads
by using
at least a shielded wire for the microphone, and a
separate pair of wires for the headphone(s). Better
isolation may be possiblewith a twisted, shielded pair
for the microphone leads. Do not allow headphone
ground to contact microphone ground or shield. Tie
the shield to microphone ground ormicrophone low.
Do not tie the shield to the case of the connector or
the case of the user station. In generalthe maximum
length for the headset cable is ten feet (3.1 meters).
Lengths over ten feet require a special extension
cable. Check with RTS Systems for help with longer
cables.
Page 8

2.4. CablingRequirements
2.4.1 Wire Sizeand Maximum Operating Distance
Wiresuedetermines the maximum operatingdis-
tance (wheretheDCvoltage dropisthelimitingfac-
tor). Thefollowingequations applyfor a conductor
sueof #22 AWG, a minimum user stationvoltageof
18.0 volts, and a minimum power supplyvoltage as
stated below.
ForModels PS10, PS30,PS31, PS50, PS60 (Vmin
=
28.4 WC):
Distance,, (feet)
= 322,181 / Itot (milliamperes).
Distan%, (meters)
= 99,133 /Itot (milliamperes)
ForModelsPS8, PSI5 (Vmin
= 24.0 VDC):
Distanc&, (feet)
= 185,874 /Itot (milliamperes)
Distan%, (meter)
= 56,654 / Itot (milliamperes)
Example: TheBP300Lwith 25 ohmheadphonesuses
up to 60 milliamperes. With a PS8 supplythe maxi-
mum operating distance for this station is 185,874160
milliamperes
= 3098 feet (944 meters). And with a
PS31power supply the maximum operating distance
is322,181160 milliamperes
= 5370feet (1652meters).
The maximum operating distance using a PS8 power
supply and a BP300 with 25 ohm phones (37
mA) is
185,874137
= 5024 feet (1531meters).
* h >.'
2.4.2 Grounding
System circuit ground should not be directly con-
nected to"earth"or "chassisnground (directlymeansa
connection an ohmmeter would show). Each user
station is bypassed to its own chassis via a 0.1 mi-
crofarad capacitor, establishing a radio frequency
(RF) ground to reduce radio frequency interference
fromradio transmitters.
To prevent a buildup of voltage across the system
ca-
pacitance, the power supply has a bleeder resistor to
chassis ground (22 kilohms). If the system has
no
RTS Systemspower supply, add a bleeder resistorat a
centralpoint in thesystem.
The benefit of not "earthngrounding the RTS System
circuit return is that continued o~erationis ~ossible
during an accidental system grouid fault. This acci-
dental grounding can happen when
a wire is pinched
or a cable scraped across a sharp edge. One acciden-
tal ground can
be tolerated by the system until the
fault
can be cleared and (with luck) before a second
ground fault can causenoise or overload or bring the
systemdown.
Another benefit of not "earthngrounding the circuit
return is that it prevents the introduction'of'noise
through "earth" currents from other equipment. If
the
RTS Systmes circuit ground conducts these
currents, it is likely that they will be heard
as
interferingnoiseon the communicationline.
2.43 Signal
The number of conductors required to interconnect
user stations is:
No. of
- No. of
Conductors Channels
Wirin~ICabling(See Cable Wiring Diagrams in Sec-
tion
7, ApplicationInformation)
Two channel
"TW" applications, or single channel,
three wire applications may use either standard mi-
crophone cabfe (for conveGence) ortwo-twisted-pair
cable (less expensivethan microphone cable). Stan-
dard wire suefor the system is #22 gauge wire for
interconnection. For permanent installations each
channel should have
an individually shielded twisted
pair of at least #22 gauge wire; such as Belden 8723
for 2 channels, and 8777for 3 channels. For plenum
and
/ or200" Cwiring, use Belden 88723 and 88777.
The plenum cable has a slightly smaller diameter, is
Teflon insulated, and about three times the price of
Wire using Cable Wiring Diagrams, Section7, to re-
duce interference and help maintain a low crosstalk
figurebetween channels.
The audio signal line level is between 10dBu and
0 dBu (between0.24 and 0.77 voltsrms). These levels
arelow enough toprevent crosstalk into other equip-
ment (such as
TV cameras) yet high enough to mini-
mize externalinterferencetothe
TW System.
The 200 ohm line impedance is high enough to allow
communication over line lengths of 1.6 kilometers
(one mile) and low enough to permit an adequate
speechbandwidthwith 3.2 kilometersof accumulated
cable. In most systems the 200 ohm impedancegives
a high fidelitybandwidthwith low losses.
When using equipment in rain orconditionsof exces-
sivemoisture, alwaysprotect the equipmentwith plas-
tic covers and make sure all cable connectors are
lifted out of mud, snow or moisture and protected
with plastic. Water mud and snow in connectorscan
causenoise.
Page 9

2.4.4 Channelto ChannelCrosstalkControl
2.7 Standard User Station Connections
Inthe TW IntercomSystem all channelssharea com-
mon circuit ground return. Crosstalk dueto common
ground resistance
can be reduced by using 22 gage
shieldedcable, and paralleling shield drain wires with
circuit return wires. Capacitive crosstalk can be re-
duced by using two shielded pair. One wire of one
pair connectsto channel one (pin
2), onewire of the
other pair connects to channel two (pin
3), the re-
maining wires are circuit return (pin 1). (See Cable
WiringDiagramatback of manual).
Crosstalk reduction may also be achieved in some
cases using Model
CCD 214 Crosstalk Cancellation
Device.
25 Mechanical
The BP300 user station is either clipped to a user's
clothing for portable operation, or mounted on a
structure,camera orvehicle.
For permanent installation, temporarily remove the
electronicsfrom thecase. Drill, deburrand fasten the
case
as necessary, then reinstalltheelectronics.
An outlinedrawing for headset user stationBP300 is
included at the end of the manual. This drawingpro-
vides mechanical information useful for permanent
and other type installations. This information in-
cludes overall dimensions, mounting information,
consolecutoutdimensionsandweights.
Itis recommended thatspacebe.provided.forcontrol
access, cabling and servicing, such
as cabling service
loops, reaching XLR type connector locks, local
power option power supplies and headset connectors
and cables.
If the headset connector is remoted, do not run this
cable close to interfering sources such
as videom
monitors, power supplies and equipment with inter-
nal power supplies.
2.6 SystemCheck
Using three beltpacks with three headsets and three
persons,verify that all persons
can intercommunicate
throughout the system. Verify that with all micro-
phone switchesoff and volume controlsmidway, only
a barely audible hiss is heard. The other two persons
should sound equally loud and clear to the third per-
son.
DynamicMicrophoneheadsetconnectors:
XLR-4-31receptacle
Inputlevel: -55 dBu, nominal
Outputlevel toheadphone: 10voltspeak-to-peak,
opencircuit.
Pin
1 - Microphonelow
Pin
2 - Microphonehigh
Pin
3 - Headphonelow
Pin4
- Headphonehigh
XLR-5-31receptacle
Pin
1 - Microphonelow
Pin
2 - Microphonehigh
Pin3
- Headphonelow
Pin4
- Headphonehigh, left
Pin 5
- Headphonehigh, right
XLR-6-31receptacle
Pin
1 - Microphonelow
Pin
2 - Microphonehigh
Pin3
- Headphonelow
Pin 4
- Headphonehigh, left
Pin5
- Headphonehigh, right
Pin
6 - Microphoneswitch
Carbon Microphone Headset Connector: 114 inch phone
jack (52):
CarbonMicrophone: Tip (-15
dBV input,nominal)
Headphone: Ring (10
V peaktopeak open circuit)
Common: Sleeve
LINEinput and LOOPIEXTensionconnectors: (J3lJ4)
XLR-3-31receptacle (for single-channel)
Pin
1 - Common (low sideof line)
Pin
2 - Power
Pin 3
- Channel
XLR-3-31receptacle (for two-channelline)
Pin
1 - Common (lowsideof line)
Pin 2
- Channel 1 (+DC)
Pin3 - Channel 2
XLR-Q-31receptacle (forthree-channelline)
Pin
1 -Channel 1
Pin 2 - Channel 2
Pin 3 - Channel3
Pin
4 - Common
Page 10

Table2-1
TypicalOperatingEnvironments,
EnvironmentalNoise, Sound PressureLevel,
at 10metersdistance
Source
- SPL
Aircraft 120dBto 160dB
Orchestra,75piece, (Peaks)or 140dB
PipeOrgan, (Peaks)
Rock Concert 110dBto 140dB
Piano,Peaks 120dB
BlaringRadio 110dB
CentrifugalVentilating Fan 110dB
AutoonHighway 100dB
VaneaxialVentilatingFan 90 dB
Voice, Shouting 90 dB
Factory
75 dB
Voice, Conversational 70 dB
+:Residence 45 dB
TelevisionStudio 25 dB to35 dB
Voice, Whisper 30 dB
Table2-2
TypicalOperatingEnvironments,
SoundPressureLevel,
at Ear
Source
- SPL
Maximum Allowable
ImpulseExposure 140db
LH267
+ BP300,
10dbbelow Clipping 114db
DT109
+ BP300,
10dbbelow Clipping
111 db
LH268
+ BP300,
10dbbelow Clipping 110db
SetcomSeries5
+ BP300,
10dbbelow Clipping
99 db
Headphoneswith 20 dbAcoustic
Isolation at 130dbRock Concert 110db
(Mouth Closed)
Headphoneswith 40 dbAcoustic
Isolationat 140dbRock Concert 100db
(Mouth Closed)
Page 11

Figure 3-1A
Front Panel, Model BP300 Portable Belt Pack User Station
CAR6 MIC
, HDST~
Figure 3-1U
Rcar Pancl, Modcl BP300 Portablc Bclt Pack Uscr Station
Page 12

SECTION 3: OPERATION
3.1 OperatingControls And Connectors
Table 3-1below liststheModel BP300 user station controlsand connectors. ThereferencenumbersinTable
3-1 correspondto thecirclednumbersinFigure3-1AandFigure3-1B.
Table
3-1
Ref No. Name
--
Description
1) CHannel SelectSwitch
1 2 Selects 1 of 2 channels(standard) or 1 of 3 channels (optional). The
optionalCall Light operates onthechannelselectedby this switch. The
CHannel selectswitch isomitted in theSingleChannel(SC) option.
2) MICON-OFF toggle A latching-action switch.
3) MICON-off push button A momentary-actionmicrophoneenableswitch ontheModelBP300
(Standard
- - withoutthe CallLight option).
3) CALLpush button (Optional)TheCALLpush button inModelBP300L (No momentary
mic).
4) VOLUME A headphoneVOLUME control. (Maybe adualcontrol for theDual
Listen (DL) orProgram
(E) option).
F3
u 5) DYNamicMICrophone A dynamicmicrophonetype headset plugsin here.
HeaDSeTConnector.
INPUT Plug intheLine connectorhere. Connectsthebelt pack user station to
the
TW intercomsystem.
7) LOOP/EXTension A convenienceconnector
- - allowsanother belt pack user stationtobe
connectedtothe
TW intercomsystem.
8)
CARBon MICrophone A carbonmicrophonetype headset plugsin here. Theheadset may also
HeaDSeTConnector be a carbon microphoneemulatetype headset.
CAUTION!
Always turn the volumecontrol all theway counterclockwise (to the left) before plugging in the headset
3.2 Operation (Afterconnectingstationtotheintercomline and plugging in headset).
Tocommunicate directlywith another station orstations:
1) TurntheVOLUMEcontrol all theway counterclocliwise(totheleft) beforepluggingin theheadset.
2) Selectthechannel using the CHannelselect switch.
3)
Setthe listeninglevel in the headset using theVOLUMEcontrol.
4)
When you want totalk, set the MIC ONIOFFtoggle switch to the"ONnposition (orpush theMICpush
button) and speak into the microphone. Return the switch tothe OFFposition to eliminateunnecessary
noise onthe intercom line.
Page 13

Figure 3-2
I%lock Iliagram, Model RI'300
Page 14

SECTION 4: REPLACEMENT PARTS
4.1 WHERE TO OBTAIN PARTS
Parts maybeobtained directly fromTelex at:
TelexIRTS Systems
12000Portland Ave.
S.
Burnsville, MN 55337
877-863-4169
Fax: [phone]
4.2 MECHANICALPARTS
FINALASSEMBLY
(Refer to Drawing #AS1786for ltemNo. locations)
item
NO. ) Description I part NO.
FrontPanelAssy, BP300
PCBAssy, CC33
BackPanelAssy
Case
Screw, #8-32X 112
Belt Clip
Rivet
Jack, Phone,3-cond,Double
ClosedCircuit
Cap, Gray With Dot
Knob, Gray
Nut Cover, Gray
Mylar, 3-112"X 100Ft
#73 ShieldBead
Shrink Sleeving, 114"
Lockwasher
Potentiometer,Audio, 50K
Nut, Hex318"
Washer, Lock, 318" Internal
Tooth
Switch, SPDT
Switch, DPDTToggle
Nut
Dress Nut, SatinFinish
Washer, Teflon (for Volume
Cont)
PARTS LIST ABBREVIATIONS: CD, Ceramic Disk;
CF, Carbon Film; CM, Ceramic Monolithic; EL,
Electrolytic;MF, Metal Film; Rad, RadialLeads;
Tant, Tantalum.
ltem No.
FRONT PANELASSEMBLY
*toDrawing #AS1787for ltemNo.
Description
Back Panel
Connector,4-Pin Female
Switch, Pushbutton
Lens, MicOn
Lug, Solder,#4
Screw, 4-40
X 318"
Nut, Hex, KEP 6-32
Part No.
Back Panel
Connector,3-PinFemale,
CanonAXR 3-31
Connector,3-PinMale
Jack, Phone,3-Cond, Double
Closed Circuit
Washer, :378 ID
Wires, LocalPurchase
Screw, 4-40
X 318"
Nut, Hex, KEP 6-32
BACK PANELASSEMBLY
(Refer to Drawing #AS1788 for ltem No. locations)
4.3 ELECTRICALPARTS
item NO. I Description
CC-33 CIRCUITBOARDASSEMBLY
Ref. No.
I Description I part NO.
Part No.
Capacitor,CM, 0.1 pF, 50V 1511R10421
Capacitor,CM, 0.033 pF, 50V
1 1511R33321 I
Capacitor,Tant, 10pF, 6.3V,
1 20% 1 1515R1063B 1
Capacitor,CM, Rad, 100pF,
50V
Capacitor, CM, 0.1 pF, 50V
Capacitor, EL, Rad, 33 pF, 16V
Capacitor,CM, 0.01 pF, 50V
Capacitor,CM, 0.1 pF, 50V
Capacitor, EL, 10pF, 16V
Capacitor,CM, 0.01 IF, 50V
Capacitor,CM, 0.1 pF, 50V
Capacitor,CD, 10pF, 500V
Capacitor, EL, Rad, 47 pF, 16V
Capacitor,CM, 0.1 pF, 50V
1511R10421
1513R3364E
1511R10321
Capacitor, Mylar, 0.001 pF,
I 1514R1022L I
I C19
I Capacitor, EL, Rad, 4.7 pF, 16V 1 1513R4754E
1
Capacitor, Tant, 1.0 pF, 35V,
I c20 1 20% I 1515R1053G I
C21 I Capacitor,CM, 0.1 pF, 50V 1 1511R10421 1

PARTS LIST ABBREVIATIONS: CD, Ceramic Disk;
CF, Carbon Film; CM, Ceramic Monolithic; EL,
Electrolytic; MF, Metal Film; Rad, Radial Leads;
Tant, Tantalum.
Ref.No.
C27
C28,C29
D1-D3
D4
D5,D6
D7
D8
D9-Dl1
Q1,Q2
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
Rll
R12
R13
R14,R15
R16
R17
R18,R19
R20
R22
R23
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35,R36
S1
S2
U1
U2
U3
U4
CC-33 CIRCUIT BOARD ASSEMBLY
Description
Capacitor, CM, Rad, 0.01pF,
200v
Capacitor, EL, 10 pF,50V
Diode, Signal 1N6263
Diode, 1N5231B
Diode, 1N4004, IA,400V
Diode, 1N5245BZener, Voltage
Reg l5V
Diode, 1N5365BZener, Voltage
Reg36V
Diode, 1N4004, lA,400V
Transistor, SiliconixJ305lE305
Resistor, CF, 470 Ohm, 1/4W,5%
Resistor, CF, 820Ohm, 1/4W,5%
Resistor, CF, 220 Ohm, 1/4W, 5%
Resistor, CF, 68K, 1/4W, 5%
Resistor, CF, 5.1M, 1/4W,5%
Resistor, CF, 330K, 1/4W,5%
Resistor, CF, 10K, 1/4W,5%
Resistor, CF, 22K, 1/4W,5%
Resistor, CF, IOOK,
1 /4W, 5%
Resistor, CF, 22 Ohm, 1/4W,5%
Trim Pot, 100K
Resistor, CF, 22K, 1/4W,5%
Resistor, CF, 200K, 1/4W,5%
Resistor, MF, 60.4K, 1/4W, 1%
Trimpot, 10K
Resistor, CF, 270K, 1/4W, 5%
Resistor,MF,20.OK, 1/4W, 1%
Resistor,
CF, loOK, 114W, s0/o
Resistor, CF, 22K, 1/4W, 5%
Resisbr, CF, 2.2K, 4/4W, 5%
Resistor,
CF, 1.2K, 114W, 5%
Resistor, CF, 4.7 Ohm, 1/4W,5%
Resistor,CF, 22K, 1/4W,5%
Resistor, CF, 100Ohm, 114W, 5%
Resistor,CF, 36 Ohm, 1/4W,5%
Resistor, CF, 1.3K, 1/4W, 5%
Resistor, CF, 12KOhm, sO/O,118W
Resistor,CF, 1K, 1/4W,5%
Resistor, CF,3.3 Ohm, 1/8W,5%
Resistor, CF, 100K. 114W,
5%
Switch, SPDT
Switch, DPDTToggle
IC, Signetics NE5532N
IC, CD4053BE
IC,Op Amp, NationalLM386N-1
IC, Voltage Regulator,National
LM317MP
Insulatorw/o Hole, Silicon
IC Socket, 16-Pin
IC Socket,8-Pin
Capacitor, CD., 22pF, 50V
Part No.
1514R10320
1513R10641
1601626300
160352310B
1601400400
1601524508
1601536508
1601400400
1602030500
140247005D
140282005D
1402220050
140268025D
140251045D
1402330350
1402100250
140222025D
1402100350
140222R05D
1409001100
140222025D
140220035D
140360422D
1409000300
1402270350
140320022D
140210005D
140222025D
44022P15D
140212015D
14024R705D
140222025D
140210005E
140236R05E
140213015D
140212025D
140210015D
14023R305B
140210035D
1903000100
1903000200
160355320N
16034053BE
1603038600
16030317MP
9130184000
2001000300
2001000100
C20
C23
C25
C26
C27
C28
C29
C30
C31
C32
C42
CR2
CR3
CR4
CR5
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
Capacitor, EL, Rad., 10 uF, 50V
Capacitor, EL, Rad., 100uF, 10V
Capacitor, Mylar, Rad., .001 uF,
l00V
Capacitor, EL, Rad., 10 uF, 16V
Capacitor, CM Rad., 1 uF, 50V
Capacitor, EL, Rad., 100uF, 10V
Capacitor, EL,Axial, 2200 uF, 16V
Capacitor, EL,Axial, 2200 uF, 16V
Capacitor, EL, Rad., 100uF, 16V
Capacitor, CM Rad., 1uF, 50V
Capacitor, CD, 100 uF, 50V
Diode, 1N6263
Diode, 1N6263
Diode, 1N6263
Diode, 1N914B
Resistor, CF, 820 Ohm, 1/4W,5%
Resistor, CF, 220 Ohm, 114W, 5%
Resistor, CF, 68K, 1/4W,5%
Resistor, CF, 220K, 1/4W, 5%
Resistor, CF, 10M, 1/4W,5%
Resistor, CF, 22K, 1/4W,5%
Resistor, CF, 10K, ll4W.5%
Potentiometer,Trimmer, 2.5 TO
1OK
Resistor, CF, loOK, 1/4W, 5%
Resistor, CF, 22 Ohm, 1/4W, 5%
Resistor, CF, 22K, 1/4W,5%
Resistor, CF, 22K, 1/4W,5%
Resistor, CF, 22 Ohm, 1/4W,5%
Resistor, CF, 2.2K, 1/4W,
5%
Resistor, CF, 2.2K, 1/4W,5%
Potentiometer, Trimmer, 2.5
TO
1OK
Resistor, MF,60.4K, 1/4W,
1%
Resistor, MF, 60.4K, l/4W,1%
Resistor, MF, 20K, 1/4W, 1%
Resistor, CF, 1K, 1/4W, 5%
Resistor, CF, 100Ohm, 1/4W,5%
Resistor, MF,20K, 1/4W,1%
51821110
51821529
151
4R1022L
51821230
1511R10421
51821529
1513A2284E
1513A2284E
51821524
1511R10421
52157330
1601626300
1601626300
1601626300
160109140B
52154283
52154297
52154237
52154225
52154 185
52154249
52154257
46643P1
52154233
52154321
52154249
52154249
52154321
52154273
52154273
46643P1
54045604
54045604
54045200
52154281
52154305
54045200

Ref. No.
R26
R28
R29
R36
R38
R39
R40
R41
R42
R43
R44
R45
R49
U1
U2
U3
U4
U5
VR1
I 1.0 Lg.
9030141800,B
CC-40145 CIRCUITBOARD ASSEMBLY
Description
Resistor, CF, 100Ohm, 1/2W,5%
Resistor, CF, loOK, 114W, 5%
Resistor, CF, loOK, 114W,5%
Resistor, CF, 22K, 114W, 5%
Resistor, CF, 150Ohm, 114W,5%
Resistor, CF, 2.7 Ohm, 1/4W,5%
Resistor, CF, 22K, 114W, 5%
Resistor, CF, 36 Ohm, 1/2W,5%
Resistor, CF, 1.3K, 114W, 5%
Resistor, CF, 12K, 114W, 5%
Resistor, CF, 1K, 114W, 5%
Resistor, CF, 3.3 Ohm, 1/8W,5%
Resistor,
CF, 470Ohm, 1/4W, 5%
IC, NE5534N
IC,MC3458P
IC, SGS TBA-820-M
IC,LM317MP
IC, Analog Switch
Voltage Regulator,5.1V, 5%,
1
N5231B
Voltage Regulator, 15V,5%.
1N5245B
Voltage Regulator,36V, 5%
1N5365B
ICSocket, 8 Pin
ICSocket, 8 Pin
ICSocket. 8 Pin
ICSocket, 16PinDIP
Insulatorwlo Hole, Silicone
ShrinkTubing, Clear, .25 Dia.
X
\)
PARTS LISTABBREVIATIONS: CD, Ceramic Disk;
CF, Carbon Film; CM, Ceramic Monolithic; EL,
Electrolytic; MF, Metal Film; Rad, Radial Leads;
Tant, Tantalum.
Part No.
52154482
52154233
52154233
52154249
52154301
52154343
52154249
52154493
52154278
52154255
52154281
521
54120
52154289
53293000
160334580P
160308200M
16030317MP
16034053BE
86266008
160152450B
160153650B
2001000100
2001000100
2001000100
53041301
9130184000
51379024
Capacitor,CD, 330 pF150V
Capacitor,220 pF150V
Capacitor,Mylar, ,022 uF/ l00V
Capacitor,Cer, .0033 uF150V
Capacitor, Mylar, .047 uF/50V
Capacitor,CM, .1 uF150V
Capacitor,CD,
680 pFl5OV
Capacitor,Mylar,.O1 uFI50V
Capacitor,Tant, 1 uF, 35V
Diode, Signal, 1N914B
Transistor,MPSU45
Resistor,CF, 68K, 114 W, 5%
Resistor,CF, 470K, 114 W, 5%
Resistor, VariableTrim, 20K
Resistor, MF,63.4K, 114 W, 1
%
Resistor,CF, 22K, 114 W, 5%
Resistor, CF, 22M, 114 W, 5%
Resistor, CF, 2M, 114 W, 5%
Resistor, CF, 10M, 114 W, 5%
Resistor,CF, 22K, 114 W, 5%
Resistor,CF, 4.7K, 114 W, 5%
Resistor,VariableTrim, 5K
Resistor,CF, IOK, 114 W, 5%
Resistor,CF, 0Ohm, 114 W, 5%
Resistor,MF, 12.7K, 1
%
lC, CD4001AE
IC, NE567N
lC, LM78L05AC2W
Wire, 24AWG, Blk, 3.0" LG.
Wire, 24AWG, Blu,3.0" LG.
Wire, 24 AWG, Red.
3.0" LG.
Wire, 24AWG, Brn,3.0" LG.
Pin,Cambion
IC Socket, 14-PinDIP
CG18SLCIRCUIT BOARDASSEMBLY
Ref. No.
[ Description I part NO.
I IC Socket, 8-Pin DIP
OG
I
. .

This page intentionally left blank.
Page 18

SECTION 5: DIAGRAMS 1 DRAWINGS
0 g$:: Title Page
Thisdrawingapplies to BP300 Unitswith CC33 or CC40 cards. Unitswith CC45cardsare one inchlonger.
...........................................
OD3415 OutlineDrawing,BP300 20
----
CableWiringDiagram,Two Channel System ................................ 21
----
...............................
CableWiringDiagram, ThreeChannel System 22
Application Znformation
'I'M11786 12-VoltBattery Operation
/ Teleproduction System Example / Multi-channelOperation /
................................
Dry Line Operation(Forextendeddistances) 23
Model BP300 UserStations with CC33 card (Standardunitsand unit3with CallLight Opfion).
SD1464 Schematic Diagram, SeriesBPhase
3 User Station ............................. 24
......................................
AS 1821 Assembly Diagram,P.C.B., CC33 25
Model BP300 UserStations with CC40 card (Unitswith various optionsor combinations of options. Also appliesto
standard units builtbetween
1979 and 1981, approximately.)
SD1427-01 (Simplified)SchematicDiagram,Phase I11 User Stations (CC40) sheet 1
................. 26
................................
F7
AS 1409 Assembly Diagram,P.C.B. CC40145 Layout 27
CC40 card detaileddiagrams
SD1427-00 SchematicDiagram,Phase 3User Stations,sheet 1of 2.
.......................... 28
SD1427~00 Schematic Diagram,Phase 3User Stations,sheet 2 of 2
........................... 29
CallLight Optionused by both Model BP300 UserStations with CC33 card (Standardunitsand units with CallLight
Option).
SD1470 ServicingDiagram, LightSignalingCircuit,CC-18SL,Phase 3Configuration ............... 30
Exploded Views
AS 1786 Final Assembly,Model BP300
........................................ 3 1
AS 1787 FrontPanel Assembly, Model BP300 ..................................... 32
..................................
AS 1788 Back Panel Assembly,BP I TWI UNITS 33
Page 19

WEIGHT: 1 .OLBS (.45kg)
ALL DIMENSIONS: INCHES(mrn)
OD3415
Outline Drawing,
BP300
Page 20