RTS BP317 User manual

USER MANUAL
I MODEL BP317 I
RTS '"
:
Portable Belt Pack User Station
9350-5435-00 Rev Dl 1/95

PROPRIETARY NOTICE
TheRTS product information and design disclosed herein
were
originated by and are theproperly of Telex
Communications,
Inc. Telex reserves all
pqnktary design, manufactlning,reschofn,useand
sales rights thereto, and to any articled~sclosed therem,
except to the extentrights are expmsly grantedto others.
COPYRIGHT NOTICE
C fight 1994by Telex Communications,Inc.. AU
rigts resaved Reproduction in whole or in part without
prior written pernussion from Telex is prohibited
PATENTNOTICE
Thisequipment contains and uses a desi nembodied in
United
States PatentNo. 4,358,644: "A kilateral Current
Sourcefor aMulti-terminal Intercom". Thisdesign
employsa two-wire to fow-wireconverter.
UNPACKING AND INSPECTION
Immediatelyupon receipt ofthe equipment. inspect the
shippingconmer
and the wnttnts carefullyfor an
discrepanciesor damage. Should there
be any, not& the
freighicompany and fiedealeratonce.
WARRANTY INFORMATION
RTS products are warranted by Telex Communications.
Inc. to
be bee from defectsin materialsand workmanship
for aperiod of
three years from the date of sale.
Thesoleobli~ationof Telex dmina thewanantv oeriod is
to provide, withoutcharge,parts aiid
labor n&&y to
remedy covered defects
appearin in productsreturned
pre aid
to Telex.This wananty & not coverany
de&t, malfunction
or failure caused beyond thecontrol
of Telex, including unreasonableor neglisent operation,
abuse, accident, falure
to foUow inSmr.hons in the
Senrice
Manual or the UserManual. defectiveor
improperassociated equipment,alt&npts modification
and repair not authorized by Telex,and sh~ping damage.
Roducu wlth theuserial numbers remov
ei oreffaced are
not coveredby this warranty.
Toobtain warranty service, follow theproceduresentitled
"Rocedure For R~ums"and "Shippingto Manufacturer
-- -
for Repair or Adjustment".
Thiswarrantv is the soleand exclusiveexoress wanantv
given with &ect
to RTS products. It 1s he
responsibility of the user to determinebefore purchase
that this ductis suitable forthe user's intended
CUSTOMER SUPPORT
Technical questions shouldbe directed to:
RETURNSHIPPING INSTRUCTIONS
If arepair is necessary, contactthedealer where this unit
was purchased.
If re air throu h thedealeris not possible, obtain a
& A&HORIZATIONfrom:
CustomerServiceDeoartment
~ ~ -~
~r~- ~~ ~ ~~
Telex ~ommun$ions, Inc.
Telephone: [phone]
Fax: [phone]
DO NOT
RETURN ANY E UIPMENT DIRECTLY
TOTHEFACTORY
WITH 8 UT FIRST
OBTAINING A RETURN AUTHORIZATION.
Be
prepared to providethe company name, address,
phone number, aperson to contactregdngthe repair,
the
type and quantity of equipment. a descriptionof the
problemand the sendnumber(s).
SHIPPING
TO MANUFACTURER FOR REPAIR OR
ADJUSTMENT
All shipmentsof RTS products should be made via
UnitedPmcel Serviceor
the best available shipper,
p aid. Theequi ment should
be shipped in the original
& g carton; i ? ,@t 1s . notavailable, use any suitable
container
that is ngld andof adeauate sue. If a substitute
containa is
used, heequipmentihould be wrap
paper and surrounded with at least four incheso ped in
excelsior or similar shock-absorbingmaterial. All
ship"
entsmust be sent to the followingaddress and must
inc ude
the Rehm Authorization.
Upon completionof any re
air the equipment will be
retuned vla United Parcel getviceor specifiedshipper
NEITHER
TELEX NOR THE DEALER WHO SELLS
RTS PRODUCTS IS
LIABLE FOR INCIDENTAL OR
CONSEQUENTIALDAMAGES OF
ANY KIND.
Page 2

TABLE OF CONTENTS
............................................
pROrnARYNOTI(3E .. 2
COPYRIGHTNOT][CE
..................................................... 2
PArnNOn(3E ........................................................ 2
UNPACKINGANDINSPECnON
............................................... 2
WARRAElTYINEDRMAnON
................................................. 2
RETLJRNSHIPPINGINSTRUCIIONS ............................................ 2
.................................... SECllON 1: DESCRIPTION & SPECIFICATIONS
4
1.lDESmON ....................................................... 4
12
BP317 SPECIFICATIONS ................................................. 5
SECllON 2: INSTALLATION ................................................ 6
2.1 TYPE OF SYSTEM,POWJWNGMETHOD AND POWER SUPPLW(IES) ..................... 6
22TYPEOFMOUNTNG ................................................... 6
23CHOOSINGHEADSETS .................................................. 6
2.4 CABLINGREQUIREMENTS ............................................... 7
2.4.1WIRES5 ...................................................... 7
2.42GROUNDING ..................................................... 7
2.43SIGNAL ........................................................ 8
....................................................... 2.SMECHANICAL 8
2.6SYSTEMCHECK ...................................................... 8
2.7 STANDARD USER STATIONCONNECTIONS ..................................... 9
SECTI0NI:OPERATION .................................................. 6
3.1 OPERATING CONTROLS AND CONNECTIONS .................................... 11
320PERATION
......................................................... 11
DIAGRAMS ....... ................................................. 12
Page 3

SECTION 1:
DESCRIPTION & SPECIFICATIONS
The Uodcl BF317 is a patable, single-channel intacom
usw station. This usw station is designed to be used in a fan
duplex,confemme he intacom system.
A confenweline intercom systemallowsa groupof
people
M talk and listen on a singIe cha~~L On this
channel, all users can listen when one or moreother
usen
are talking (co1&~115ig). Up to 75 nscrs can
sham the sameconfaence line (or conferencebus),
Fullduplex
operation allowstwoway condonat
the sametime, that is, oneuser can intermpta second
user while thesecond usw is still talking.
The BP317 with a headset, in effect,interfaces a human uw
to the intercom system.The user tallcs and listens using the
headset (or a handset) The headset connects to the BP317
via a fourconductorfableandcorntor. The BP317 con-
nects to the system using a three conductor"microphone"
typecable.The
BP317 containstwoconmls to helptheuser
ininterface well to theinmmsystem: the volume control,
and
the microphone switch.
The volume control on the BP317 has a wide range to
cumpensate for. user hearing differences, ambient noise
variation, variations in headset I handset sensitivity, and
variationsintalkervoices.
The volumecontrolinthe BP317
reducesdistortionby driving theheadphone amplifieronly
as much asneeded.
In
ncumal system operation, one or more users talk and the
rest lkta. Amicauphoneswitchon each stationallows the
talker's miaophone to be enabled and allows the listuras
tokeep theirtnicmphomM1dInthisoondition,speech
intelligibility is enhanced since background noise from
other microphones is not pmmt
The microphone switcb has three positions:
(1) center "OFF",
(2) momentary "ON", and
(3) latched "ON".
Themomentarypasitionallows quickbumsofcommunica-
tion,
especially mful in a high noise environment The
latched posih allows "hands £fee" operation. when the
user needs to have. two way convedonwhileperforming
anotheractivity.
Model
BP317 Connections, Inputs & Outputs
Unmodified
BP317 usw stationshave two connexm.
1. An XLR4 type female connector for a dynamic
microphoneheadsetorhandset.
2. An XLR-3 type femak con- to tie the station to
the communicationsline.
Power Reqninments
-\The
BP317 requires from + 15 to +35 volts DC, but is
opaable
at reducedperformance from + 12 to +I49 volts.
Power is carried to the unit from a system power supply
using two different methods: (1) the
TW or two wire
method, or (2) the three wire or Series 17 method.
OptionalFeatures
User-instaUed optionsinclude:
carbon microphone headset
connection, two-wire lineopention, and two-channel line
opelalion.
The
BP317 workswith both theTWIntercomSystem and
the Series 17 Intercom System. Further informationabout
theTW Intercom System and theSeries 17 IntmcmSystem
isfoundin Appendix A.

13 BP317SPECIFICATIONS
InputDC Voltage
18to 35 volts
DC (12to 17volts, reduced perfor-
-)
DC Cmnt
Quiescent
'20 milliamperes
Operating, 10dB
below dipping
25
ohm headphones 35 milliamperes
Impedance
Across Lie
10,000ohms,
minimum
Environmental
Temperature
operating
Storage
Humidity
&
Storage 5%to 95%non-condensing
Noise Contribution
One unit -75 dBu
Ten units -67 dBu
MicrophonePreamplifier
InputImpedance 470ohms/dynamic
mi
SourceImpedance 200 ohms, nominal
Maximum Input
Level 150millivolts
FrequencyResponse
(-54dBu input) 100hertz to 10kilohertz
f 3 dB
LimiterRange 30dB
CarbonMic
(User Option)
ExcitationCln~ent I0
milliamperes, nominal
CurrentSource
TransferRatio 3.3
milliamperes / volt
= 3.3 millisiemens
Output
i5 milliamperesinto200 ohms
= f 1volt peak, nominal
HeadphoneAmplifier
Voltage
Gain 34 dB
Onlput Voltage 8volts
@-@peak into 25 ohms
1/2
watt peak into 25 ohms
HeadphoneImpedanceRange
25 to 600 ohms(500 to 2000 with reduced levels)
NOTE: DO NOT USE HEADPHONESWH
IMPEDANCESLESSTHAN
25 OHMS.
Sidetone
Adjustment Range
-2OdBtoNlon
HeadsetConnector
Dynamic MicrophoneXLR
type 4-pin female
LieConnections
Input XLR
type 3-pin female
Dhndoos
5.20
H x 3.00 W x 1.5P D, inches
132
H x 76 W x 38 D, millimeters
Weight
1.1
pounds, 0.5 kilograms
Fi
Clear, anodized aluminum I or texturedgrey paint
*Depth with beltclip: 1.87 inchcs147.5 mm
SPECIFICATIONNOTES:
0dBu
= 0.775 volts rms.
0 dBm = 1 milliwatt
= 0.775 volts rms into 600 ohm load
(0 dBu,open circuit)
Note:
M products and specificationssubject to
change wilhout notice.
Page 5

Followthe ~~: "To Insall theBP317". below.
2.1 Type Of System, Power@ Method And Power
Supplier(ii)
'Ihe BP317
can be installedin a (1) three wire system, (2)
two
wire system. a (3) special two wire system.
(1) In a three wire system ("Series 17"type), the powex is
sepate fmm the audio and is supplied by a central
power supply.
(2)
In atwo wire system CTW" type), the powa and audio
may sharethesamewire.Ihepowerissmctntral-
lyby a special "lW" typepower supply.
(3) In a special two wire system (Lccal Power), each
BP317 islocallypowered. and theBP317sin the sys-
tem
are interconnectedusingtwo wire cable.
In(1)above,thepowersupplyisaregulatedsupply.24 volts
DC to 32volts DC. Up to57BP317s can be ope@ed from
a2
amp supply.
In case (2)above, the number of BP317s
that can powered
by various "TW" powa supplies are as follows: PS8power
supply: 12;PSI%
28. PS31: 42.
In (3)above,alocalpowersupplyneedstopvide18to 24
volts
DC at 100 milliamperes peak.
In (1)and(3)above.the two wires canying the audiorequire
onesystemterminatonconsistingof a200
ohm resistor and
a 100microfarad/50voltcapacitorinseries.
This combina-
tion is connected
across the two wires. If the capacitor is
polarizeditsnegative
teaminal isconnected to the system
circuitcommon.
To Install the BP317:
1. Determinethetype of system in which theBP317isto
be
installed. Determine the powering method and
power supply(ies).
2.
Determine the mounting of the BP317: Portable or
Permanent.
3. Read "Choosing Headsets or Handsetsts(Section23).
4. Debermine
the cablingrequirements.
5.
Create a system block diagram andequipment list (id
not alreadyavailable),theninstallthe system.
6. Verify correct system operation by using the checkout
pmcedme in Section2.6.
7.
Update the system block diagram, equipment list and
any other documentation to
reflect the "as installed"
configuration. If the system block diagram was
originally created by RTS Systems,send a copy of the
"as installed" system block diagram toRTS Systems.
This
diagram will be used to update the original
documentalion.and
for future service suppon.
(1) Onetype of mountingfortheBP317 ispatable, when
itisworn ondothing
or an equipmentbelt.TheBP317
has a Mt clip.
(2) Another type of mounting forthe BP317 ispermanent
or semi-permanent,eithera "desk mount" (sittingon a
desk) or fastenedtofmniture. Avoidplacing the BP317
on
a metal cr gmunded metalsurface. Contactbetween
the Model BP317 and metal s~lrfacesmay cause un-
wanted noisesontheintercomline.
2.3 Choosing Headsets
hfmiwt& Headset choice depends on operating en-
vironment,operatingrequirements,
and personal taste.
ODn;ltinnEnvimma&Table2-1showstypicaloperating
envinnunentsandtheamountofbackgroundnoisepresent.
A very quietoperatingenvironmentmay require that sound
does not leak from fhe headphones, meaning the head-
phones
should have good "acousticisolation".
A
very noisyhoud environment usually requires head-
phones
that prevent dde sound from leaking in (ngain,
good
acoustic isolation), headphones that can produce a
loud, clear
sound, and noise cancelling microphones, as
well.

Undexstandingspeechin a noisyenvironment requires that
the wanted soundfrom the hexbhones is as loud or louder
than theunwanted sound leaking intothe headphones limn
the noisy environment.
I,mdw% In generaltheloudnessof a headphone depends
upon its ab'ity to abxab pwer at a given wltage (m-
peaanCe) and the efficiencyof its design. Practically, the
impedance has a largereffectwith presentday headsets.
Imoedance. Low impedanceheadphones are louder, caw-
ingtheBP317todraw morecun'entfmnthepo~ers~1~.
Hirgh impdance headphones an not as lm&drawingiem
nmentfrom
the powersupply. The BP317 Mgn range of
impedancesfwtheheadphonepratoftheheadsetis25ohms
to 600 ohms. Headphomsup to2000ohms will functionbut
at reducedlevels. In adoublemuffheadsetsuch as the Beyer
DT109soldbyRTS Systems,there
are 50ohmheadphones
connectedin parallelresulting in an impedanceof25ohms.
Efficiencv. TheBP317 produces the loudestsoundin low
impedance headphones such
as the DT109. In this head-
phone, one milliwatt of electricalpower produces
94 dB
SPL (Sound Pressure Level).
The
BF'3 17 can produce an SPLof Ill
dB in each ear of a DT109 w DT108 headwi Low im-
=& as theDTlO8 and DTlW headsets,
cause the BP317 to require mwe powex
fmn the power
supply. With DT109 headsets, BF'317
peak current is 75
milhamperes. With
600 headphones.BP317 peak currentis
30 milliamperes. (Quiescent BP317 current
is 20 mil-
Ilamperes.
The ability of headphones to shut out unwanted environ-
mentalnoise
varies from none(0 dB isoktian) to aboutnth
as loud (30 dB isolation). The dep of isolation depends
both on thedesignof the headset and thefrequencycontent
of
the environmentalnoise. Lightweight, "open" headsets
such
as theRTS SystemsLW67 (singlemu@ andI33268
(doublemuff), havealmostno (0 dB) isolation.
The bade-
off isthat the LH267/LH268 are very comfortableand can
be worn for long periods (8 to 12hours) without physical
discomfort from the earmuffs or headband. The
LH267bH268
are low impedance and can be turned up
loud.
Because there
is no isolation, we must be Iaken that the
sound signals
from theLH267bH268 are not unintention-
ally leaked intomicmphones.
TheDTlBDT109hudsetshaveanisolationrangingfrom
10
dB tom dB.
At leastfourcompanies: Telex, Setcom, David Clark, and
Carts Engineering sell headsets intended for heavy in-
dushial,
aerospace, and military markets. These headsets
can-provide mustic isolation figures of 2OdB to 40dB.
Generally speaking, these headsets
are heavier and less
comfntable to
wear.
In high noiseenvimmnents,theheadsetmicrophoneshould
be a noisecancelling type.
-In general, thecomfortof headsetsdepends upon
theirweight,padding and design.
2.4. Cabling Requirements
2.4.1 Wire Size
Itmay be necessary to overcomepowerlossesbyincreasing
conductor
size over long nms (more than one kilometer).
Normal conductor size is #22 AWG (16ohm/lOOO ft.). The
maximum allowable loop resistance is deVrmi by the
powex supplyvoltage,
the loopcurrentand the user station
minimum operatingvoltage. The maximum loopresistance
equals the difference of the power supply voltage and the
minimum operatingvoltagedivided by the maximum loop
current(pwerrequhd by the
user station(s)).
Example: A BF'317 headset station (with 25 ohm head-
phones)
uses 35milliarnpres at 10 dB below clipping. The
power supply voltage is 26 volts DC and the user station
minimum operating voltage is 18 volts DC (for bridging
impedance).
Then the maximum allowableloop resistance
= (26-18) volW.035 amperes = 228 ohms.
'Ibis cmespnds to an operating distanceof 2192 meters
(7.125 feet) fora
#22 AWG wire pair using a single user
stationwith25ohmheadphones. Dataforthesecalculations
can be foundin the specificationsin section 1and in stand-
ard electrical wire tables.
2.42 Grounding
Systemcircuitground should not
be directly connected to
"tarth" w "chassis"ground(wheredirectlymeansaconneo
tion an ohmmeter would show). Each user station is
bypased toitsown chassisvia a 0.1 microfarad capacitor,
establishingaradio frequency
CRF) ground to reduce radio
frequencyinterferencefromradiotransmitters.
Page 7

In 0rde.r to prevent a buildup of Muage aaoss the system
capacitance, the power supply
has a bleeder resistor to
chassis ground
(22 kilohms). If the system has no RTS
power supply, a bleeder redstor should be supplied at a
centralpointin
the system.
Thebasic bdt of not "earth" gromding the RTS System
circuit
return is that itpennits continued opedondming
an accidental ground faalt This accidtntal ground-
ing can happen as the result of a pinched wire or a scraped
cable that has been pulled across a sharp edge. A single
accidental ground can be Ideated by the system until the
fault can be clearedand (with luck) befon a second ground
fault
can causenoiseorovaloadorbringthe system down.
Anotherhetitof not "earth" grounding the drcuit IC~
is that itpventsthe intduction of noise through "earth"
currents from other equipment If the RTS circuit ground
conductsthese cmts,it
is likely that they will be heard
as interferingnoiseon thecommunication line.
Zd.3 Signal
The number of conductors
required to intexcmect user
stations
is:
Number of
Conductors
Number of
i2haM&
Two channel "TW" applications, a single channel, three
wire applicationsmay useeither standard miaophonecable
(for convenience) or
two-twkted-pair cable (considaably
lessexpensive
than miaqhonecable). Standard wire size
for the system is #22 gauge wire for intemnnection For
paman&t
installatio~it&recommcndedthat~hchannel
shouldhaveindividually shielded twisted pair of at least #22
gauge wire. such as Belden #87U fa 2 channels. 'Ibis will
- -
reduceint&erenceand helpmaintainalow cmsstalkfigure
between channels.
In genaal, shielded cable will reduce
interference. Umhielded cable
can often be sdully
used.
The audio signallinelevel is maintainedbetween -10 dBu
and 0dBu (between0.24
and 0.77 voltsrms). nKse levels
are low enough to prevent crosstalk into other equipment
(such
as TV camaasf yet high enough to reduce extanal
interferenceto the
TW System.
The
200 ohm line impdance is high enough to allow
comm~onover line lengths of
1.6 kilometers (one
mile) and low enough to permit
an adequate speech
bandwidih with
3.2 kilometers of accumulated cable. In
most systemsthe 200 ohm impedance givesa high fidelity
bandwidthwith low
losses.
When using equipment in rain or conditions of excessive
moishne, alwaysprotect theequipment with plasticcovers
and
make sun all cable connectors m liffed out of mud,
snowormoishneand~tedmthplastic.Watcl'mudand
snow in connectas can causeconsiderablehum.
TheBP317
user stationiseitherclipped to auser's clothing
forportableoperation,ormounted on asmcture,cameraor
vehicle.
For permanent installation, temporarily remove the
deckmica fmm the we. Drill, debmand fasten thecase
as necessary,then reinstall theelectronics.SeeSection 5 for
inshudions
on how toremovetheelectronicsfrom the case.
An insrallaton drawing faheadset user station BP317 is
includedatthe end of this section.Thesedrawingsprovide
mechanical informationusefulforpermanentandothertype
installations.
This information includesoveralldimensions,
fastener hole locations, console cutout dimensions and
weights.
Spaceallowancesfor control access.cablingand serviciig
must be
-ned on a case by case basisby theinstaller.
It is recommended that space be provided for: cabling
hce loops, caching XLR flpe connector I&, local
powa option power supplies and headset connectors and
cables.
If the headw connectorisremoted. allow space between
this cable and interfering sources such as videom
monitors, power supplies and equipment with
internal
power supplies.
2.6 System Check
Usingthmbeltpackswith three headsetsand threepersons,
verify all persons can intercommunicate bunhout the
systek. V& that with all microphoneswitch& off and
volumecontrolsmidway,
only abarelyaudible hiss isheard.
Theothertwo personsshouldsoundequallyloudandclear
tothe
third person.
Page 8

2.7 Standard User StationConneetiom
DynamicMiaophone headsetconnector:
XLR-4-3
1 type (female4pin)receptacle(J102)
Input level
-55dBu, nominal
Outputlevel to hedphone
10volts
peak-to-* open circuit
Pin 1
- Miuuphonelow
Pin 2
- Miaophonehigh
Pin3
- Headphonelow
Pin 4 -Headphonehigh
Do not common pins
1 and3.
Lineinputconnector: J101)
XLR-3-31receptacle(forsinglechannel)
Pin 1
- Common (low side of line)
Pin2-Power
Pin 3
- Channel
XLR-3-31 receptacle(for two-channel)
Pin 1
- Common (low side of line)
Pin
2 - Channel 1 (+DC)
Pin 3 - Channel 2 (Audio)
* For opemion on channel2 only or both channels if so
modifiedMay also beopemted on channel 1 by connecting
using
line cable with just two wires (canmon and TW
channel 1)then tying pins2 and 3 togetheratconnector.
Table
2-1
Typical Operating Environments,
Environmental
Noise, Smnd Ressure Lcvel,
at 10 metersdistance
SQuCx Seh,
AimatlR 1mdBto160dB
Orchestra 75piece,
(Peaks) or 140dB
Pipe
Organ. Pealis)
Rock Concert 110dBto140dB
Piano,
Peaks 120dB
BlaringRadio 110dB
Cenhif'ugal Ventilating Fan 110dB
Auto onHighway 100dB
VaneaxialVentilating Fan 90dB
Voice, Shouting 90dB
Factory 75dB
Voice, Conversational 70dB
Residence 45 dB
Television Studio 25dBto35dB
Voice,
whispa
30dB
Table
2-2
Typical Operating Environments,
Soolld Prrsnrre Level, at Ear
SQUm SEL
Maximum Allowable Impulse 140dB
Exposure
LH267 + BP317 114dB
10dBbelow Clipping
DT109
+ BP3U 111dB
10
dB below Clipping
LHZ68 + BP317 llOdB
10dB below Clipping
SetcomSeries
5 + BP317 99dB
10dB below Clipping
Headphoneswith 20dBAcoustic 11OdB
Isolation
at 130dB RockConcert
(MouthClosed)
Headphoneswith 40dBAcoustic 100dB
Isolationat 140dB
Rock Concert
(MouthClosed)

Figure 3-1A
FrontPanel, ModelBP317Portable Belt Pack User Station
3-18
Rear Panel,ModelBP317 Portable Belt Pack User Station

-
SECTION 3: OPERATION
3.1 OperatingControls And Connectio11~
Table3-1below
lists the Model BP.17 user stationwntrok and connectas. merefaencenumbers in Table3-1 carespond
to thecirclednumbersinFigure3-1.
3w&l
Ref.
& &I.&
Front Panel
1 VOLUMEcontrol
MICON
toggle
Setsthe soundlisteninglevelin the user stationheadset headphones.
This thttepositiontoggle switch allows the user to choose from two
differentMIC-ON pasitionx latching
a momentary. The center toggle
&tim
is MIC-OFF. 'Ibe user stationmicroohone mav be wed on or
Lff without affectingthe oser station listen Gction.5sswitch must
be on when using amiaophone switch on the headset.
Rear Panel
DYNAMIC micro~hone
INTERCOM
INPUT
("line") conneetor
This4-pin female
XLR type connectorisfor plugging in a dynamic
microphone type
headset. A wide rangeof headset types may be used.
This
3-pin female XLR type connector connectsthe user station to the
Twsystemorsaies 17line.
3.2 Operation
Tocommunicate
directly with another station or stations:
1) Turn the volume controlallthe way counterclockwise
(to the left) before plugging in the headset.
2) Set the MIC ON/OFF toggle switch to one of the "OW positions, either momentary or latching. If using a headset, this
switch must be on before the microphoneswitch on the headset
can be used.
3) Set the listeninglevelin the headset using the Volume conml.
4) Spakinto the microphone.
Page 11

DIAGRAMS
l3xmmRs
Document
NuDh Sir& Title rn
OD 5435 Outline Drawing,Belt Pack, Mode1 BF'317 ........................... 13
ServicingAssembly
Diagram, (32-62 P.C. Assy for ModelBP317PortableBelt
Wck User Station ......................................... 14
Schematic
Diagram, Male1BP317PortableBelt Pack Uset Station,Sheet 1 of 1
....... 15

ALL DIMENSIONS : INCHES [MU)

A
CC-62 PCB ASSY
E-
TOP VIEW
61 '
CC-62 P.C. ~ssy fa
DIODES ARE INSTALLED
wMklmli7Rrarblt
IkkPdrIkamim
WITH CATHODES DOWN
CC-62 PCB ASSY
m
SIDE VIM