Federal signal corporation Pa300 series 690009 Manual



Price $4.00Price $4.00

 Model Model PA300*PA300*

ELECTRONIC SIRENELECTRONIC SIREN

INSTALLATION, INSTALLATION, SERVICE, SERVICE, AND OAND OPERATING PERATING INSTRUCTIONSINSTRUCTIONS



LIMITED WARRANTYLIMITED WARRANTY

The Signal Division, Federal Signal Corporation (Federal), warrants eachThe Signal Division, Federal Signal Corporation (Federal), warrants each

new product to be free from defects in material and workmanship, undernew product to be free from defects in material and workmanship, under

normal use and service, for a period of two years on parts replacement andnormal use and service, for a period of two years on parts replacement and

one year on labor from the date of delivery to the first user-purchaser.one year on labor from the date of delivery to the first user-purchaser.

During During this this warranty warranty period, period, the the obligation obligation of of Federal Federal is is limited limited to to repairingrepairing

or replacing, as Federal may elect, any part or parts of such product whichor replacing, as Federal may elect, any part or parts of such product which

after examination by Federal discloses to be defective in material and/orafter examination by Federal discloses to be defective in material and/or

workmanship.workmanship.

Federal Federal will will provide provide warranty warranty for anfor any uy unit wnit which hich is dis delivered, elivered, transportedtransported

prepaid, to prepaid, to the Fedethe Federal factory oral factory or designar designated authorted authorized warrized warranty servianty servicece

center for examination and such examination reveals a defect in materialcenter for examination and such examination reveals a defect in material

and/or workmanship.and/or workmanship.

This warranty does not cover travel expenses, the cost of specializedThis warranty does not cover travel expenses, the cost of specialized

equipment fequipment for gaining acor gaining access to the cess to the product, oproduct, or labor charr labor charges for remges for removaloval

and re-installation of the product. Lamps, flash tubes, or batteries are notand re-installation of the product. Lamps, flash tubes, or batteries are not

covered under warranty.covered under warranty.

This warranty does not extend to aThis warranty does not extend to any unit which has been subjected to abuse,ny unit which has been subjected to abuse,

misuse, improper installatimisuse, improper installation or which on or which has been inadequately maintained,has been inadequately maintained,

nor to units which have problems relating to service or modification at anynor to units which have problems relating to service or modification at any

facility facility other other than than the the Federal Federal factory factory or or authorizeauthorized d warranty warranty serviceservice

centers.centers.

THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED,THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED,

INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIESINCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES

OF OF MERCHANTABILITY MERCHANTABILITY OR OR FITNESS FITNESS FOR FOR A A PARTICULARPARTICULAR

PURPOSE. IN NO PURPOSE. IN NO EVENT SHALL FEDERAL EVENT SHALL FEDERAL BE LIABLE BE LIABLE FOR ANYFOR ANY

LOSS LOSS OF OF PROFITS PROFITS OR OR ANY ANY INDIRECT INDIRECT OR OR CONSEQUENTIACONSEQUENTIALL

DAMAGES DAMAGES ARISING ARISING OUT OUT OF AOF ANY SNY SUCH DUCH DEFECT EFECT IN MIN MATERIAL ATERIAL OROR

WORKMANSHIP.WORKMANSHIP.



The Federal Model PA300 (figure 1-1) is aThe Federal Model PA300 (figure 1-1) is a

precision built, efficient and economical, full-fea-precision built, efficient and economical, full-fea-

tured electronic siren of advanced design. It providestured electronic siren of advanced design. It provides

wail, yelp and hi-lo siren tones, as wail, yelp and hi-lo siren tones, as well as the Tap IIwell as the Tap II

feature, public address (PA), radio rebroadcast andfeature, public address (PA), radio rebroadcast and

an air horn sound.an air horn sound.

The siren may be installed in The siren may be installed in positive or nega-positive or nega-

tive ground vehicles with 12-volt electrical systems.tive ground vehicles with 12-volt electrical systems.

It is protected against failure modes (including re-It is protected against failure modes (including re-

versed polarity) by versed polarity) by a fuse that is replaceable withouta fuse that is replaceable without

tools. No components protrude from the bottom of thetools. No components protrude from the bottom of the

siren to interfere with mounting arrangements.siren to interfere with mounting arrangements.

A noise-cancelling microphone is A noise-cancelling microphone is wired-in towired-in to

prevent loss or theft. It provides high quality voiceprevent loss or theft. It provides high quality voice

SECTION ISECTION I

GENERAL DESCRIPTIONGENERAL DESCRIPTION

 Figure Figure 1-1. Model 1-1. Model PA300* PA300* Electronic Electronic Siren.Siren.

reproduction without feedback “squeal”. The micro-reproduction without feedback “squeal”. The micro-

phone push-to-talk switch overrides any siren signalphone push-to-talk switch overrides any siren signal

for instant PA use. PA and radio volume are adjust-for instant PA use. PA and radio volume are adjust-

able by means of a front able by means of a front panel GAIN control. Radiopanel GAIN control. Radio

inter-connect wires are built-in. No additional cablesinter-connect wires are built-in. No additional cables

are required.are required.

The Model PA300's 100-watt output is designedThe Model PA300's 100-watt output is designed

to drive a single high power speaker.to drive a single high power speaker.

The Tap II feature allows the driver to changeThe Tap II feature allows the driver to change

the siren sound from wail to yelp the siren sound from wail to yelp (or vice-versa) via(or vice-versa) via

the vehicle's horn ring. Tap II provides especiallythe vehicle's horn ring. Tap II provides especially

effective traffic clearing capability. In addition to Tapeffective traffic clearing capability. In addition to Tap

II, additional alternate sounds can be activated inII, additional alternate sounds can be activated in

two other selector switch positions by depressing andtwo other selector switch positions by depressing and

holding the horn ring for as holding the horn ring for as long as the alternatelong as the alternate

sound is desired. The charts in Section IV of sound is desired. The charts in Section IV of thisthis

manual illustrate the operation of these featuresmanual illustrate the operation of these features

more fully.more fully.

Other special features of the Model PA300Other special features of the Model PA300

include:include:

•• High degHigh degree of reliabiree of reliability is achievelity is achievedd

through the use of integrated circuitsthrough the use of integrated circuits

and silicon output transistors.and silicon output transistors.

•• ContrControl panel is illuminaol panel is illuminated withted with

non-glare lighting.non-glare lighting.

•• Newly Newly designed pdesigned printed circuit rinted circuit boardboard

provides improved performance andprovides improved performance and

durability under a wide range ofdurability under a wide range of

environmental conditions.environmental conditions.

 -1--1-



SECTION IISECTION II

SPECIFICATIONSSPECIFICATIONS

IInnppuut t VVoollttaaggee .. .. .. .. .. .. .. .. .. .. .. .. .. 1111VVDDC C tto o 1166VVDDC C ((1166V V ooppeerraattiioon n lliimmiitteed d tto o 115 5 mmiinnuutteess))..

PPoollaarriittyy .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. NNeeggaattiivve e oor r ppoossiittiivve e ggrroouunndd..

SSttaannddbby y CCuurrrreenntt .. .. .. .. .. .. .. .. .. .. .. .. 112200mmaa. . mmaaxx. . ((nnoot t iinnccll. . ppaanneel l lliigghhtt))..

OOppeerraattiinng g TTeemmppeerraattuurre e RRaannggee .. .. .. .. .. .. .. --3300°°C (-22C (-22°°F) to +60F) to +60°°C (+149C (+149°°F).F).

OOppeerraattiinng g CCuurrrreennt t ((1144VVDDCC--WWaaiil l mmooddee)) .. .. .. .. 110 0 aammppeerreess, , mmaaxx..

FFrreeqquueennccy y RRaannggee .. .. .. .. .. .. .. .. .. .. .. .. 77225 5 tto o 11557755HHzz..

CCyycclle e RRaattee .. .. .. .. .. .. .. .. .. .. .. .. .. .. WWaaiill- - 112 2 ccyycclleess//mmiinn..

Yelp- 180 cycles/min.Yelp- 180 cycles/min.

Hi-Lo- 60 cycles/min.Hi-Lo- 60 cycles/min.

Voltage Output (apVoltage Output (approx.)prox.) .. .. .. .. .. .. .. .. .. 64V peak-to-peak.64V peak-to-peak.

DDiimmeennssiioonns s ((HHWWDD)) .. .. .. .. .. .. .. .. .. .. .. 22--11//22" " ((66..3355ccmm) ) x x 66--11//22" " ((1166..5511ccmm) ) x x 88--11//22" " ((2211..5599ccmm))..

NNeet t WWeeiigghht t ((iinnccll. . mmiiccrroopphhoonnee)).. .. .. .. .. .. .. .. 44--11//2 2 llbbss. . ((22..0044kkgg))..

SShhiippppiinng g WWeeiigghhtt .. .. .. .. .. .. .. .. .. .. .. .. 66--11//2 2 llbbss. . ((22..9944kkgg))..

NOTENOTE

The following parameters were obtained with theThe following parameters were obtained with the

radio input potentiometer and GAIN control setradio input potentiometer and GAIN control set

at maximum.at maximum.

Audio Frequency RAudio Frequency Rangeange .. .. .. .. .. .. .. .. .. .. 300 to 10,000Hz.300 to 10,000Hz.

HaHarmrmononic ic AuAudidio Do Disistotortrtioion (n (30300-0-3,3,00000H0Hz)z).. .. .. .. 1010% m% maxax. a. all ll popowewer lr levevelels fs frorom 1m 1/2 /2 to to 50 50 wawatttts (s (frfreqequeuencncyy

responseresponse ±±3dB).3dB).

IInnppuut t IImmppeeddaanncce e ((RRaaddiioo)) .. .. .. .. .. .. .. .. .. 2200000 0 oohhmmss..

Input voltage required to obtain 20VRMS acrossInput voltage required to obtain 20VRMS across

 ssppeeaakkeer r llooaad d ((RRaaddiioo)) .. .. .. .. .. .. .. .. .. .. 00..5555VVRRMMSS..

-2--2-



SECTION IIISECTION III

INSTALLATIONINSTALLATION

SAFETY MESSAGE TO INSTALLERSSAFETY MESSAGE TO INSTALLERS

OFOF

ELECTRONIC SIRENSELECTRONIC SIRENS

WARNINGWARNING

The lives of people depend on your proper installation andThe lives of people depend on your proper installation and

servicing of Federal products. It is important to read andservicing of Federal products. It is important to read and

follow all instructions shipped with the products. In addition,follow all instructions shipped with the products. In addition,

listed below are some listed below are some other important safety instructions andother important safety instructions and

precautions you should follow:precautions you should follow:

Before InstallationBefore Installation

QualificationsQualifications

•• To prTo propeoperly irly instnstall aall an elen electrctronionic sirc siren: yen: you muou must hast have ave a

good understanding of automotive electrical proceduresgood understanding of automotive electrical procedures

and systems, along with proficiency in the installationand systems, along with proficiency in the installation

and service of safety warning equipment. Always refer toand service of safety warning equipment. Always refer to

the vehicle's service manuals when performingthe vehicle's service manuals when performing

equipment installations on a vehicle.equipment installations on a vehicle.

Sound HazardsSound Hazards

•• YouYour her heariaring ang and tnd the hhe hearearing ing of oof othethers, rs, in oin or clr close ose toto

your emergency vehicle, could be damaged by loudyour emergency vehicle, could be damaged by loud

sounds. This can occur from short exposures to very loudsounds. This can occur from short exposures to very loud

sounds, or from longer sounds, or from longer exposures to moderately loudexposures to moderately loud

sounds. For hearing conservation guidance, refer tosounds. For hearing conservation guidance, refer to

federal, state, or local recommendations. OSHAfederal, state, or local recommendations. OSHA

Standard 1910.95 offers guidance on “Permissible NoiseStandard 1910.95 offers guidance on “Permissible Noise

Exposure.”Exposure.”

•• All eAll effeffectictive sve sireirens ans and hond horns prns prodroduce luce loud oud sousounds (nds (120120

dB) that may cause permanent hearing loss. AlwaysdB) that may cause permanent hearing loss. Always

minimize your exposure to siren sound and wear hearingminimize your exposure to siren sound and wear hearing

protection. Do not sound the siren indoors or in enclosedprotection. Do not sound the siren indoors or in enclosed

areas where you and others will be exposed to the sound.areas where you and others will be exposed to the sound.

•• FedFederaeral Sil Signagnal sil siren ren ampamplifilifiers ers and and spespeakeakers rs areare

designed to work together as a system. Combining adesigned to work together as a system. Combining a

siren and speaker from difsiren and speaker from different manufacturers mayferent manufacturers may

reduce the warning effectiveness of the siren system andreduce the warning effectiveness of the siren system and

may damage the components. You should verify or testmay damage the components. You should verify or test

your combination to make sure the system worksyour combination to make sure the system works

together properly and meets federal, state and together properly and meets federal, state and locallocal

standards or guidelines.standards or guidelines.

During InstallationDuring Installation

•• DO NODO NOT geT get met metal tal shashavinvings igs insinside tde the phe prodroductuct. Me. Metaltal

shavings in the product can cause the system to fail. Ifshavings in the product can cause the system to fail. If

drilling must be done near the unit, place an drilling must be done near the unit, place an ESDESD

approved cover over the unit to approved cover over the unit to prevent metal shavingsprevent metal shavings

from entering the unit. Inspect the unit after mountingfrom entering the unit. Inspect the unit after mounting

to be sure there are no shavings present in or near theto be sure there are no shavings present in or near the

unit.unit.

•• DO NODO NOT coT connennect tct this shis systystem tem to tho the vehe vehiclicle bae battettery ury untintill

ALL other electrical connections ALL other electrical connections are made, mounting ofare made, mounting of

all components is complete, and you have verified thatall components is complete, and you have verified that

no shorts exist. If wiring is shorted to vehicle frame,no shorts exist. If wiring is shorted to vehicle frame,

high current conductors can cause hazardous sparkshigh current conductors can cause hazardous sparks

resulting in electrical fires or flying molten metal.resulting in electrical fires or flying molten metal.

•• Be sBe sure ure the the sirsiren aen amplimplifiefier anr and sd speapeakerker(s) (s) in yin yourour

installation have compatible wattage ratings.installation have compatible wattage ratings.

•• In orIn order fder for thor the elee electrctronionic sirc siren to fen to funcunctiotion pron properperly, tly, thehe

ground connection must be made to the NEGATIVEground connection must be made to the NEGATIVE

battery terminal.battery terminal.

•• SouSound ound outputput wilt will be sl be seveeverelrely rey reducduced if aed if any ony objebjects cts areare

in front of the speaker. If maximum sound output isin front of the speaker. If maximum sound output is

required for your application, you should ensure that therequired for your application, you should ensure that the

front of the speaker is clear of any obstructions.front of the speaker is clear of any obstructions.

•• InsInstaltall thl the spe speakeaker(er(s) as s) as far far forforwarward on d on the the vehvehiclicle ase as

possible, in a location which provides maximumpossible, in a location which provides maximum

signaling effectiveness and minimizes the soundsignaling effectiveness and minimizes the sound

reaching the vehicle’s occupants. Refer to the reaching the vehicle’s occupants. Refer to the NationalNational

Institute of Justice guide 500-00 for further information.Institute of Justice guide 500-00 for further information.

•• MouMountinting tng the sphe speakeakers ers behbehind tind the ghe grillrille wile will redl reduce tuce thehe

sound output and warning effectiveness of the sirensound output and warning effectiveness of the siren

system. Before mounting speakers behind the grillsystem. Before mounting speakers behind the grill e,e,

make sure the vehicle operators are trained make sure the vehicle operators are trained andand

understand that this type of installation is less effectiveunderstand that this type of installation is less effective

for warning others.for warning others.

•• SouSound pnd propropagaagatiotion ann and wad warnirning eng effeffectictivenveness ess will will bebe

severely reduced if the speaker is not facing forward.severely reduced if the speaker is not facing forward.

Carefully follow the installation instructions and alwaysCarefully follow the installation instructions and always

install the speaker with the projector facing forward.install the speaker with the projector facing forward.

•• DO NDO NOT iOT instnstall all the the spespeakeaker(s r(s ) or ) or rouroute tte the she speapeakerker

wires where they may interfere with the operation of airwires where they may interfere with the operation of air

bag sensors.bag sensors.

•• InsInstaltallatlation oion of two f two spespeakeakers rrs requequireires wirs wiring sing speapeakerkers ins in

phase.phase.

•• NevNever ater attemtempt tpt to inso instaltall aftl aftermermarkarket eet equiquipmepment, wnt, whichichh

connects to the vehicle wiring, without reviewing aconnects to the vehicle wiring, without reviewing a

vehicle wiring diagram - available from the vehiclevehicle wiring diagram - available from the vehicle

manufacturer. Insure that your installation will notmanufacturer. Insure that your installation will not

affect vehicle operation and safety faffect vehicle operation and safety functions or circuits.unctions or circuits.

Always check vehicle for proper operAlways check vehicle for proper operation afteration after

installation.installation.

•• DO NDO NOT inOT instastall ell equiquipmepment ont or ror route ute wirwiring oing or cor cord ird in thn thee

deployment path of an air bag.deployment path of an air bag.

•• LocLocate ate the the concontrotrol hel head sad so tho the vee vehichicle, cle, contontrolrols, as, andnd

microphone can be operated safely.microphone can be operated safely.

•• WheWhen drn drilliilling inng into a vto a vehiehicle scle strutructucture, bre, be sure sure thae that bott bothh

sides of the surface are clear of anything that could besides of the surface are clear of anything that could be

damaged.damaged.

After InstallationAfter Installation

•• AftAfter iner instastallatllationion, tes, test the st the sireiren sysn system atem and lignd light syht systestemm

to ensure that it is to ensure that it is operating properly.operating properly.

•• TesTest alt all vel vehichicle fule functnctionions, ins, inclucludinding hog horn orn operperatiation,on,

vehicle safety functions and vehicle light systevehicle safety functions and vehicle light systems, toms, to

ensure proper operation. Ensure that installation hasensure proper operation. Ensure that installation has

not affected vehicle operation or changed any not affected vehicle operation or changed any vehiclevehicle

safety function or circuit.safety function or circuit.

•• AftAfter er testestinting is g is comcompleplete, te, proprovidvide a e a copcopy oy of thf theseese

instructions to the instructional staff and instructions to the instructional staff and all operatingall operating

personnel.personnel.

•• File File thethese inse instrstructuctionions in a ss in a safe pafe placlace and e and refrefer ter to theo themm

when maintaining and/or reinstalling the when maintaining and/or reinstalling the product.product.

Failure to follow all safety precautions and instructions mayFailure to follow all safety precautions and instructions may

result in property damage, serious injury, or death to you or others.result in property damage, serious injury, or death to you or others.

-3--3-



3-3-1.1. UUNNPAPACCKKININGG..

After unpacking the After unpacking the Model PA300, examine Model PA300, examine itit

for damage that may have occurred in transit. If thefor damage that may have occurred in transit. If the

equipment has been damaged, file a claim immedi-equipment has been damaged, file a claim immedi-

ately with the carrier stating the extent of damage.ately with the carrier stating the extent of damage.

Carefully check all envelopes shipping labels andCarefully check all envelopes shipping labels and

tags before removing or destroying them.tags before removing or destroying them.

3-3-2.2. MOMOUNUNTITING NG BRBRACACKEKET.T.

WARNINGWARNING

When installing equipment inside air bagWhen installing equipment inside air bag

equipped vehicles, the installer MUSTequipped vehicles, the installer MUST

ensure that the equipment is installedensure that the equipment is installed

ONLY in areas recommended by the vehicleONLY in areas recommended by the vehicle

manufacturer.manufacturer.

Failure to observe this warning will reduceFailure to observe this warning will reduce

the effectiveness of the air bag, damage thethe effectiveness of the air bag, damage the

air bag, or potentially damage or dislodgeair bag, or potentially damage or dislodge

the equipment, causing serious injury orthe equipment, causing serious injury or

death to you or others.death to you or others.

The PA300 comes equipped with a swingingThe PA300 comes equipped with a swinging

bracket which enables it to be bracket which enables it to be mounted in variety ofmounted in variety of

positions. Positioning the bracket above the unitpositions. Positioning the bracket above the unit

allows mounting to the underside of the dash. allows mounting to the underside of the dash. Posi-Posi-

tioning the bracket below the unit will tioning the bracket below the unit will permit mount-permit mount-

ing on any horizontal surface.ing on any horizontal surface.

The unit should be mounted in The unit should be mounted in a position thata position that

is both comfortable and convenient to the operator.is both comfortable and convenient to the operator.

Keep visibility and accessibility of controls in Keep visibility and accessibility of controls in mind.mind.

To install the unit under the To install the unit under the dash, determine thedash, determine the

mounting location and proceed as follows (see figuremounting location and proceed as follows (see figure

3-1).3-1).

CAUTIONCAUTION

The unit must be installed in an adequatelyThe unit must be installed in an adequately

ventilated area. Neveventilated area. Never install near heaterr install near heater

ducts.ducts.

A.A. Use one of the mountUse one of the mounting brackets as aing brackets as a

template and scribe two drill positioning marks attemplate and scribe two drill positioning marks at

the selected mounting location under the dash.the selected mounting location under the dash.

CAUTIONCAUTION

Before drilling holes in ANY part of aBefore drilling holes in ANY part of a

vehicle, be sure that both sidvehicle, be sure that both sides of thees of the

mounting surface are clear of partsmounting surface are clear of parts

that could be damaged; such as brakethat could be damaged; such as brake

lines, electrical wiring or other vitallines, electrical wiring or other vital

parts.parts.

B.B. Drill twDrill two 1/4-ino 1/4-inch diametch diameter holes at theer holes at the

position marks.position marks.

-4--4-

Figure 3-1. installation of PA300 Under Dash.Figure 3-1. installation of PA300 Under Dash.

C.C. SecurSecure the mounting brae the mounting bracket to the dashcket to the dash

with (2 each) 1/4-20 x 3/4 hex head with (2 each) 1/4-20 x 3/4 hex head screws, 1/4 splitscrews, 1/4 split

lockwashers and 1/4-20 hex nuts as shown lockwashers and 1/4-20 hex nuts as shown in figurein figure

3-1.3-1.

D.D. Secure the PSecure the PA300 unit to A300 unit to the mountingthe mounting

bracket with black 1/4-20 x 7/16 hex head sbracket with black 1/4-20 x 7/16 hex head screws andcrews and

1/4 split lockwashers.1/4 split lockwashers.

E.E. Tilt the unit Tilt the unit to the desired to the desired position. Tightenposition. Tighten

the black 1/4-20 x 7/16 hex head the black 1/4-20 x 7/16 hex head screws.screws.

3-33-3.. POPOWER WER CACABLBLE IE INSTNSTALALLALATIOTION.N.

The power cable included in the carton isThe power cable included in the carton is

equipped with a twelve-prong plug (P5) that equipped with a twelve-prong plug (P5) that matesmates

with the connector (J5) on the rear of with the connector (J5) on the rear of the electronicthe electronic

siren (see figure 3-2). The various wires on siren (see figure 3-2). The various wires on thethe

connector must be connected as follows:connector must be connected as follows:

WARNINGWARNING

Failure to observe this Failure to observe this WARNING mayWARNING may

result in fire, burns or blindness.result in fire, burns or blindness.

If shorted to vehicle frame, high currentIf shorted to vehicle frame, high current

conductors can cause hazardous sparksconductors can cause hazardous sparks

resulting in electrical fires or moltenresulting in electrical fires or molten

metal.metal.

DO NOT connect this system to vehicleDO NOT connect this system to vehicle

battery until ALL other electrical connec-battery until ALL other electrical connec-

tions are made and mounting of alltions are made and mounting of all

components is complete.components is complete.

Verify that no short Verify that no short circuits exist, beforecircuits exist, before

connecting to the Positive (+) batteryconnecting to the Positive (+) battery

terminal.terminal.



 CAUTION CAUTION

The horn ring transfer circuit of the sirenThe horn ring transfer circuit of the siren

is capable of switching a maximum of 2-is capable of switching a maximum of 2-

amperes. Some vehicles do not have a hornamperes. Some vehicles do not have a horn

relay and, consequently, will draw morerelay and, consequently, will draw more

than 2-amperes when the vehicle horn isthan 2-amperes when the vehicle horn is

activated. Consult your vehicle serviceactivated. Consult your vehicle service

manual or a qualified mechanic to manual or a qualified mechanic to deter-deter-

mine the current required to activate themine the current required to activate the

horn. If it ishorn. If it is lessless than 2-amthan 2-amperes, peres, performperform

the procedure in step 3. If it isthe procedure in step 3. If it isgreatergreater thanthan

2-amperes, perform steps 4 through 10.2-amperes, perform steps 4 through 10.

3.3. SplicSplice the white the white contre control cable wol cable wire (P5ire (P5,,

pin 10) to the horn side pin 10) to the horn side of the cut wire. Insulate theof the cut wire. Insulate the

splice with a wire nut.splice with a wire nut.

4.4. Obtain a SObtain a SPST rePST relay of suflay of sufficieficient contant contactct

current capacity to activate the vehicle horn. Refer tocurrent capacity to activate the vehicle horn. Refer to

figure 3-4 while performing the following steps.figure 3-4 while performing the following steps.

5.5. Mount tMount the relahe relay in a suiy in a suitable lotable locatiocation.n.

6.6. ConneConnect the hct the horn sidorn side of the e of the wire cuwire cut int in

step 1 to the relay contact terminal.step 1 to the relay contact terminal.

7.7. DeterDetermine thmine the “sense “sense” of te” of the vehihe vehicle’scle’s

horn ring activation circuit, i.e., does the horn circuithorn ring activation circuit, i.e., does the horn circuit

require a switched positive voltage or switchedrequire a switched positive voltage or switched

ground for activation.ground for activation.

8.8. ConneConnect the rct the relay welay wiper teiper terminarminal to thel to the

positive or negative potential determined in step 7.positive or negative potential determined in step 7.

9.9. ConneConnect the wct the white cohite control cntrol cable wiable wire tore to

one end of the relay coil.one end of the relay coil.

10. Connect the other end of the relay coil 10. Connect the other end of the relay coil toto

the opposite potential of that connected to the wiperthe opposite potential of that connected to the wiper

in step 8.in step 8.

D.D. Connection to Power SourceConnection to Power Source..

The PA300 can operate from any 12-voltThe PA300 can operate from any 12-volt

positive or negative ground vehicle electrical system.positive or negative ground vehicle electrical system.

Figure 3-4. Horn Ring Connections.Figure 3-4. Horn Ring Connections.

-5--5-

 Figure Figure 3-2. 3-2. Rear Rear View View of of PA300.PA300.

A.A.SpeakerSpeaker..

CAUTIONCAUTION

Connecting a low power speaker (58W), orConnecting a low power speaker (58W), or

two speakers, to the unit will damage thetwo speakers, to the unit will damage the

siren or speaker(s). Always use one 11-ohm,siren or speaker(s). Always use one 11-ohm,

high power (100W) speaker.high power (100W) speaker.

The unit is designed to operate with one The unit is designed to operate with one 11-11-

ohm, high power (100W) speaker.ohm, high power (100W) speaker.

Connect the speaker leads (18 gauge wire)Connect the speaker leads (18 gauge wire)

as shown in Control Cable Wiring Diagram, figureas shown in Control Cable Wiring Diagram, figure

3-3.3-3.

B.B.RadioRadio..

To allow incoming radio messages to beTo allow incoming radio messages to be

rebroadcast over the outside speakers, connect therebroadcast over the outside speakers, connect the

two brown zip cord leads (P5, pins 9 and 12) two brown zip cord leads (P5, pins 9 and 12) acrossacross

the two-way radio’s speaker.the two-way radio’s speaker.

C.C.Horn RingHorn Ring..

In order to utilize the Tap II In order to utilize the Tap II and Press-and-and Press-and-

Hold features of the siren, the following procedureHold features of the siren, the following procedure

must be performed.must be performed.

1.1. LocaLocate the wirte the wire that coe that connects tnnects the vehiche vehiclele

horn ring switch to the horn horn ring switch to the horn or horn relay. Cut thisor horn relay. Cut this

wire.wire.

2.2. See figSee figure 3-4ure 3-4. Splic. Splice the white the white/yee/yellowllow

control cable wire (P5, pin 7) to the control cable wire (P5, pin 7) to the horn ring side ofhorn ring side of

the wire that was cut in the wire that was cut in step 1. Insulate the splicestep 1. Insulate the splice

with the wire nuts (supplied).with the wire nuts (supplied).

Figure 3-3. Control Cable Wiring Diagram.Figure 3-3. Control Cable Wiring Diagram.



Therefore, before making any electrical connections,Therefore, before making any electrical connections,

determine the polarity of the vehicle electrical systemdetermine the polarity of the vehicle electrical system

ground.ground.

Power for the siren can be obtained from thePower for the siren can be obtained from the

vehicle’s power distribution cevehicle’s power distribution center or directly fromnter or directly from

the vehicle battery. If power is going to be the vehicle battery. If power is going to be obtainedobtained

directly from the vehicle battery, drill a hole in directly from the vehicle battery, drill a hole in thethe

vehicle firewall for the pvehicle firewall for the power lead to enter the ower lead to enter the engineengine

compartment. Place a grommet or similar device incompartment. Place a grommet or similar device in

the hole to pro-tect the wire against damage fromthe hole to pro-tect the wire against damage from

rough edges.rough edges.

CAUTIONCAUTION

Before drilling holes in ANY part of theBefore drilling holes in ANY part of the

vehicle, ensure that both sides vehicle, ensure that both sides of the surfaceof the surface

are clear of parts that could be are clear of parts that could be damaged;damaged;

such as brake lines, fuel lines, electricalsuch as brake lines, fuel lines, electrical

wiring or other vital parts.wiring or other vital parts.

If your vehicle has a negative If your vehicle has a negative ground electri-ground electri-

cal system, perform the procedure in paragraph 1.cal system, perform the procedure in paragraph 1.

Perform the procedure in paragraph 2, if the vehiclePerform the procedure in paragraph 2, if the vehicle

has a positive ground system.has a positive ground system.

11.. NNeeggaattivive e GGrroouunndd..

a.a. CoConnnnecect tt the he grgreeeen (n (P5P5, p, pin in 5)5)

control cable lead to the vehicle chassis as close ascontrol cable lead to the vehicle chassis as close as

practical to the siren. Scrape paint away from thepractical to the siren. Scrape paint away from the

selected bolt hole to ensure a selected bolt hole to ensure a good electrical connec-good electrical connec-

tion to the chassis.tion to the chassis.

b.b. RoRoutute te the he rered (d (P5P5, p, pin in 6) 6) anand td thehe

black (P5, pin 4) control cable leads, through theblack (P5, pin 4) control cable leads, through the

previously drilled hole, into the engine compartment.previously drilled hole, into the engine compartment.

Route the wires through existing clamps and holdersRoute the wires through existing clamps and holders

toward the battery.toward the battery.

c.c. TTo po prorottecect tt the he rered wd wirire we whehenn

connected to the battery terminal, use an in-lineconnected to the battery terminal, use an in-line

fuseholder and 20-ampere fuse (not fuseholder and 20-ampere fuse (not supplied). Thesupplied). The

fuseholder should be installed as close fuseholder should be installed as close as practical toas practical to

the battery. If necessary, additional #14 gauge orthe battery. If necessary, additional #14 gauge or

heavier wire can be spliced to the heavier wire can be spliced to the red lead.red lead.

WARNINGWARNING

If wires are shorted to the vehicle If wires are shorted to the vehicle frame orframe or

each other, high current conductors can causeeach other, high current conductors can cause

hazardous sparks resulting in electrical fireshazardous sparks resulting in electrical fires

and molten metal.and molten metal.

Verify that no short circVerify that no short circuits exist beforeuits exist before

connecting to the Positive (+) battery termi-connecting to the Positive (+) battery termi-

nal.nal.

DO NOT connect this system to the vehicleDO NOT connect this system to the vehicle

battery until ALL other electrical connectionsbattery until ALL other electrical connections

are made and mounting of all components isare made and mounting of all components is

complete.complete.

Failure to observe this WARNING will resultFailure to observe this WARNING will result

in fire, burns and blindness.in fire, burns and blindness.

d.d. CoConnnnecect tt the ihe in-n-liline fne fususehehololdederr

lead to the positive (+) battery terminal.lead to the positive (+) battery terminal.

e.e. CoConnnnecect tt the he blblacack wk wirire e to to ththee

negative terminal of the battery.negative terminal of the battery.

22.. PPoossiittiivve e GGrroouunndd..

a.a. CoConnnnecect tt the he grgreeeen (n (P5P5, p, pin in 5)5)

control cable lead to the vehicle chassis as close ascontrol cable lead to the vehicle chassis as close as

practical to the siren. Scrape paint away from thepractical to the siren. Scrape paint away from the

selected bolt hole to ensure a selected bolt hole to ensure a good electrical connec-good electrical connec-

tion to the chassis.tion to the chassis.

b.b. RoRoutute te the he blblacack (k (P5P5, p, pin in 4) 4) anandd

the red (P5, pin 6) control cable leads, through thethe red (P5, pin 6) control cable leads, through the

previously drilled hole, into the engine compartment.previously drilled hole, into the engine compartment.

Route the wire through existing clamps and holdersRoute the wire through existing clamps and holders

toward the battery.toward the battery.

c.c. To To prprototecect tt the he blblacack wk wirire we whehenn

connected to the battery terminal, use an in-lineconnected to the battery terminal, use an in-line

fuseholder and 20-ampere fuse (not fuseholder and 20-ampere fuse (not supplied). Thesupplied). The

fuseholder should be installed as close fuseholder should be installed as close as practical toas practical to

the battery. If necessary, additional #14 gauge orthe battery. If necessary, additional #14 gauge or

heavier wire can be spliced to the heavier wire can be spliced to the black lead.black lead.

-6--6-



-7--7-

WARNINGWARNING

If wires are shorted to the vehicle If wires are shorted to the vehicle frame orframe or

each other, high current conductors can causeeach other, high current conductors can cause

hazardous sparks resulting in electrical fireshazardous sparks resulting in electrical fires

and molten metal.and molten metal.

Verify that no short circuitVerify that no short circuits exist befores exist before

connecting to the Positive (+) battery termi-connecting to the Positive (+) battery termi-

nal.nal.

DO NOT connect this system to the vehicleDO NOT connect this system to the vehicle

battery until ALL other electrical connectionsbattery until ALL other electrical connections

are made and mounting of all are made and mounting of all components iscomponents is

complete.complete.

Failure to observe this WARNING will resultFailure to observe this WARNING will result

in fire, burns and blindness.in fire, burns and blindness.

d.d. CoConnnnecect tht the ine in-l-linine fue fusesehoholdlderer

lead to the negative (hot) battery terminal.lead to the negative (hot) battery terminal.

e.e. CCononnenect ct tthe he rered wd wirire te to to thehe

positive terminal of the battery.positive terminal of the battery.

3-43-4.. AIR AIR HORHORN N PRPRESSESS-A-AND-ND-HOLHOLDD

 MODIFICATION. MODIFICATION.

The unit comes from the factory set so The unit comes from the factory set so that thethat the

peak-and-hold sound will be heard when the Selectorpeak-and-hold sound will be heard when the Selector

switch is set to MANUAL and the vehicle horn ring switch is set to MANUAL and the vehicle horn ring isis

activated. To change the sound to air horn, merelyactivated. To change the sound to air horn, merely

move jumpers JU1 and JU2 from the “PEAK” posi-move jumpers JU1 and JU2 from the “PEAK” posi-

tion on the P.C. board to the “AIR” position (seetion on the P.C. board to the “AIR” position (see

figure 3-5).figure 3-5).

3-53-5.. RERELATLATIVIVE PA LOUE PA LOUDNEDNESS ADSS ADJUSJUSTMETMENTNT..

After the PA300 After the PA300 is completely installed in theis completely installed in the

vehicle, set the Selector vehicle, set the Selector switch to MANUAswitch to MANUAL. DepressL. Depress

Figure 3-6. Relative PA Loudness Adjustment.Figure 3-6. Relative PA Loudness Adjustment.

the microphone push-to-talk switch, speak in athe microphone push-to-talk switch, speak in a

normal voice, and adjust the GAIN control for thenormal voice, and adjust the GAIN control for the

desired sound level outside the vehicle. Turn-on thedesired sound level outside the vehicle. Turn-on the

vehicle’s two-way radvehicle’s two-way radio and adjust the volume tio and adjust the volume to ao a

comfortable listening level inside the vehicle. Thencomfortable listening level inside the vehicle. Then

set the Selector switch to RADIO. Stand outside ofset the Selector switch to RADIO. Stand outside of

the vehicle and note the radio rebroadcast loudness.the vehicle and note the radio rebroadcast loudness.

If the sound volume is too If the sound volume is too loud or too soft, adjust R11loud or too soft, adjust R11

through the hole at the bottom of the through the hole at the bottom of the siren (see figuresiren (see figure

3-6) to the desired sound level.3-6) to the desired sound level.

After the adjustmAfter the adjustment is completed, the loudent is completed, the loudnessness

of the radio rebroadcast and public address may beof the radio rebroadcast and public address may be

varied with the front varied with the front panel GAIN control.panel GAIN control.

3-63-6.. TETESTSTING AING AFTFTER IER INSTNSTALALLALATIOTION.N.

WARNINGWARNING

All effective sirens and horns All effective sirens and horns produce loudproduce loud

sounds (120 dB) that may cause permanentsounds (120 dB) that may cause permanent

hearing loss. Always minimize your exposurehearing loss. Always minimize your exposure

to siren sound and wear hearing protection.to siren sound and wear hearing protection.

Do not sound the siren indoors or in enclosedDo not sound the siren indoors or in enclosed

areas where you and others will areas where you and others will be exposed tobe exposed to

the sound.the sound.

After installation; test the After installation; test the electronic siren,electronic siren,

including horn operation, to ensure that it is including horn operation, to ensure that it is operat-operat-

ing properly.ing properly.

After testing is compAfter testing is complete, provide a coplete, provide a copy of thisy of this

manual to all operating personnel.manual to all operating personnel.

Figure 3-5. Press and Hold Modification.Figure 3-5. Press and Hold Modification.



SECTION IVSECTION IV

OPERATIONOPERATION

SAFETY MESSAGE TO OPERATORS OFSAFETY MESSAGE TO OPERATORS OF

FEDERAL SIGNAL ELECTRONIC SIRENSFEDERAL SIGNAL ELECTRONIC SIRENS

AND LIGHT/SOUND SYSTEMSAND LIGHT/SOUND SYSTEMS

WARNINGWARNING

The lives of people depend on your safe opera-The lives of people depend on your safe opera-

tion of Federal products. It is important totion of Federal products. It is important to

read and follow all instructions shipped withread and follow all instructions shipped with

the products. In addition, listed below arethe products. In addition, listed below are

some other important safety instructions andsome other important safety instructions and

precautions you should follow:precautions you should follow:

QualificationsQualifications

•• To To prpropopererly ly ususe ae an en elelectctroroninic sc siriren en anandd

speaker(s): you must have a good understandingspeaker(s): you must have a good understanding

of general vehicle operation, a high proficiencyof general vehicle operation, a high proficiency

in the use of safety warning equipment, andin the use of safety warning equipment, and

thorough knowledge of state and federalthorough knowledge of state and federal

UNIFORM TRAFFIC CODES.UNIFORM TRAFFIC CODES.

Sound HazardsSound Hazards

•• YoYour hur heaeariring ang and nd ththe he heaeariring ng of of otothehersrs, i, in orn or

close to your emergency vehicle, could be dam-close to your emergency vehicle, could be dam-

aged by loud sounds. This can occur from shortaged by loud sounds. This can occur from short

exposures to very loud sounds, or from longerexposures to very loud sounds, or from longer

exposures to moderately loud sounds. Forexposures to moderately loud sounds. For

hearing conservation guidance, refer to federal,hearing conservation guidance, refer to federal,

state, or local recommendations.state, or local recommendations.

OSHA Standard 1910.95 offers guidance onOSHA Standard 1910.95 offers guidance on

“Permissible Noise Exposure.”“Permissible Noise Exposure.”

•• AlAll efl effefectctivive se sirirenens ans and hd hororns pns proroduduce ce loloudud

sounds (120 dB) that may cause permanentsounds (120 dB) that may cause permanent

hearing loss. hearing loss. Always minimize yAlways minimize your exposure toour exposure to

siren sound, roll up your windows and wearsiren sound, roll up your windows and wear

hearing protection. hearing protection. Do not sound Do not sound the sirenthe siren

indoors or in enclosed areas where you indoors or in enclosed areas where you andand

others will be others will be exposed to exposed to the sound. the sound. Only useOnly use

the siren for emergency response situations.the siren for emergency response situations.

Sound LimitationsSound Limitations

•• BeBefofore re ususing ing ththe ve vehehiciclele, c, cheheck ck to to sesee ie if tf thehe

siren speakers are concealed from view. If thesiren speakers are concealed from view. If the

siren speaker is not in clear view on the front ofsiren speaker is not in clear view on the front of

the vehicle, use extra caution when operatingthe vehicle, use extra caution when operating

the vehicle. A concealed siren speaker installa-the vehicle. A concealed siren speaker installa-

tion is less effective at warning others.tion is less effective at warning others.

•• MaMaxiximumum sm souound nd ououtptput ut wiwill ll be be sesevevererely ly rere--

duced if any objects are in front of duced if any objects are in front of the speaker.the speaker.

If your installation has obstructions in frontIf your installation has obstructions in front

of the speaker, drive even more cautiously.of the speaker, drive even more cautiously.

•• FrFreqequeuentntly ily insnspepect tct the she spepeakaker ter to eno ensusure tre thahatt

it is clear of any obstruction, such as mud orit is clear of any obstruction, such as mud or

snow, which will reduce maximum soundsnow, which will reduce maximum sound

output.output.

Signaling LimitationsSignaling Limitations

•• Be Be awawarare te thahat tt the he ususe oe of yf youour vr visisuaual al and nd auau--

dible signaling devices does not give you dible signaling devices does not give you thethe

right to force your way through traffic. Yourright to force your way through traffic. Your

emergency lights, siren, and actions areemergency lights, siren, and actions are

REQUESTINREQUESTING the G the right-of-way.right-of-way.

•• AlAlththouough gh yoyour ur wawarnrnining sg sysystetem im is os opeperaratitingng

properly, it may not alert everyone. Peopleproperly, it may not alert everyone. People

may not hear, see, or heed your may not hear, see, or heed your warning signal.warning signal.

You must recognize this fact You must recognize this fact and continueand continue

driving cautiously.driving cautiously.

•• SiSitutuatatioions ns mamay oy occccur ur whwhicich oh obsbstrtrucuct yt youourr

warning signal when natural or man-madewarning signal when natural or man-made

objects are between your vehicle and others.objects are between your vehicle and others.

This can also occur when you raise your hoodThis can also occur when you raise your hood

or trunk lid. If these situations or trunk lid. If these situations occur, be espe-occur, be espe-

cially careful.cially careful.

Driving LimitationsDriving Limitations

•• At At ththe ste starart ot of yf youour sr shihiftft, y, you ou shoshould uld enensusurere

that the light/sound system is securely attachedthat the light/sound system is securely attached

to the vehicle and operating properly.to the vehicle and operating properly.

•• If tIf the uhe uniniquque coe combmbininatatioion of n of ememerergegencncy vy vehehiciclele

equipment installed in your vehicle hasequipment installed in your vehicle has

resulted in the siren controls being installedresulted in the siren controls being installed

in a position that does in a position that does not allow you to operatenot allow you to operate

them by them by touch only, OPERATE CONTROLStouch only, OPERATE CONTROLS

ONLY WHILE YOUR VEHICLE IS STOPPED.ONLY WHILE YOUR VEHICLE IS STOPPED.

•• If dIf dririviving cng conondidititionons res reququirire ye youour fur full all attttenen--

tion, you should avoid operating the sirention, you should avoid operating the siren

controls while the vehicle is in motion.controls while the vehicle is in motion.

Continuing EducationContinuing Education

•• FiFile le ththesese ie insnstrtrucuctitionons is in a n a sasafe fe plplacace ae andnd

refer to them periodically. Give a copy of theserefer to them periodically. Give a copy of these

instructions to new recruits and trainees.instructions to new recruits and trainees.

Failure to follow these safety precautions mayFailure to follow these safety precautions may

result in property damage, serious injury, or death toresult in property damage, serious injury, or death to

you, to passengers, or to others.you, to passengers, or to others.

-8--8-



44--11.. GGEENNEERRAALL..

All controls utilized during All controls utilized during normal operation ofnormal operation of

the Model PA300 are located on the front panel (seethe Model PA300 are located on the front panel (see

figure 4-1).figure 4-1).

The wired-in noise cancelling microphone pro-The wired-in noise cancelling microphone pro-

vides high quality voice repvides high quality voice reproduction in the publicroduction in the public

address mode. The microphone push-to-talk switchaddress mode. The microphone push-to-talk switch

will override all siren functions, except radio rebroad-will override all siren functions, except radio rebroad-

cast, for instant PA use.cast, for instant PA use.

4-4-2.2. GAGAIN IN COCONTNTROROL.L.

The GAIN control is used to turn the sThe GAIN control is used to turn the siren oniren on

and off. Also, it is used to and off. Also, it is used to control the volume whencontrol the volume when

the siren is used for public the siren is used for public address or radio amplifi-address or radio amplifi-

cation. Clockwise rotation of the knob increases voicecation. Clockwise rotation of the knob increases voice

volume in the public addrvolume in the public address or radio amplificationess or radio amplification

mode. The GAIN control does not control the volumemode. The GAIN control does not control the volume

of the siren signals.of the siren signals.

The maximum clockwise setting of the controlThe maximum clockwise setting of the control

will be determined, in most cases by will be determined, in most cases by the point atthe point at

which feedback or “squeal” occurs. This will dependwhich feedback or “squeal” occurs. This will depend

upon the microphone gain, open windows, speakerupon the microphone gain, open windows, speaker

placement, proximity of reflecting surfaces (buildingplacement, proximity of reflecting surfaces (building

or other vehicles), etc. Adjust the GAIN control to aor other vehicles), etc. Adjust the GAIN control to a

position just below the point at which position just below the point at which feedbackfeedback

occurs or as desired.occurs or as desired.

4-4-3.3. SESELELECTCTOR OR SWSWITITCHCH..

The Selector switch is a five-position rotaryThe Selector switch is a five-position rotary

switch used to select the mode of operation. Theswitch used to select the mode of operation. The

following are positions on the Selector switch.following are positions on the Selector switch.

A.A.RADIORADIO..

In this position, incoming radio messagesIn this position, incoming radio messages

are amplified by the siren and rebroadcast over theare amplified by the siren and rebroadcast over the

outside speaker.outside speaker.

B.B.MANUALMANUAL..

In this position, it is possible to operate theIn this position, it is possible to operate the

siren by activating the siren by activating the HORN/SIREN switch. TheHORN/SIREN switch. The

siren can also be activated by means of an auxiliarysiren can also be activated by means of an auxiliary

switch, such as the horn ring switch, such as the horn ring button (refer to para-button (refer to para-

graph 4-6).graph 4-6).

C.C. WAILWAIL..

In this position, the siren produces a In this position, the siren produces a con-con-

tinuous “wailing” sound, up and down in frequency.tinuous “wailing” sound, up and down in frequency.

D.D. YELPYELP..

In this position; a continuous, rapid “war-In this position; a continuous, rapid “war-

bled” tone is generated.bled” tone is generated.

E.E.HI-LOHI-LO..

In this position, a two-tone sound will In this position, a two-tone sound will bebe

heard. This distinctive tone may be reserved for anyheard. This distinctive tone may be reserved for any

special indication or situation.special indication or situation.

4-4-4.4. HOHORNRN/S/SIRIREN EN SWSWITITCHCH..

The HORN/SIREN switch, located on the leftThe HORN/SIREN switch, located on the left

side of the front panel, activates the electronic airside of the front panel, activates the electronic air

horn sound (up) or peak-and-hold sound (down) inhorn sound (up) or peak-and-hold sound (down) in

any siren mode except radio.any siren mode except radio.

4-4-5.5. TATAP P II II FUFUNCNCTITIONONS.S.

Tap II allows Tap II allows the driver to the driver to change the change the sirensiren

sound via the vehicle’s horn ring. This sound via the vehicle’s horn ring. This feature isfeature is

especially effective for clearing traffic. The chartespecially effective for clearing traffic. The chart

below demonstrates how the horn ring can be below demonstrates how the horn ring can be used toused to

change the siren sound:change the siren sound:

TAP II FUNCTIONSTAP II FUNCTIONS

SSeelleeccttoor r FFiirrsst t HHoorrn n SSeeccoonnd d HHoorrnn

SSwwiittcch h RRiinng g TTaap p RRiinng g TTaapp

PPoossiittiioon n PPrroodduuccees s PPrroodduucceess

 WWaaiill YYeellp p WWaaiill

 YYeellpp WWaaiil l YYeellpp

4-64-6.. PRPRESESS AS AND ND HOLHOLD FD FUNCUNCTITIONSONS..

Additional alternate sounds Additional alternate sounds can be activated incan be activated in

two other Selector switch positions, by depressingtwo other Selector switch positions, by depressing

and holding the horn ring for as and holding the horn ring for as long as the alternatelong as the alternate

sound is desired. The chart below shows thesesound is desired. The chart below shows these

additional “Press and Hold” functions:additional “Press and Hold” functions:

 PRESS PRESS AND AND HOLD HOLD FUNCTIONSFUNCTIONS

SSeelleeccttoorr PPrreesss s oonn RReelleeaasse e oof f 

SSwwiittcchh HHoorrn n RRiinngg HHoorrn n RRiinng g 

PPoossiittiioonn PPrroodduucceess PPrroodduucceess

 HHii--LLoo AAiir r HHoorrnn HHii--LLoo

 MMaannuuaall PPeeaak k aanndd CCooaasst t ddoowwnn

HHoolld d oorr aannd d ssiilleennccee

Air HornAir Horn or silenceor silence

Figure 4-1. Front View.Figure 4-1. Front View.

-9--9-



SECTION VSECTION V

CIRCUIT DESCRIPTIONCIRCUIT DESCRIPTION

55--11.. GGEENNEERRAALL..

The Model PA300 circuitry can be divided intoThe Model PA300 circuitry can be divided into

seven functional blocks. Refer to figure 5-1 and 6-4seven functional blocks. Refer to figure 5-1 and 6-4

while reading the following paragraphs.while reading the following paragraphs.

5-25-2.. RARATE OTE OSCISCILLLLATOATORS ARS AND VND VOLOLTAGTAGEE

CONTROLLED OSCILLATOR.CONTROLLED OSCILLATOR.

The heart of the Model PA300 circuitry is theThe heart of the Model PA300 circuitry is the

rate oscillator and VCO sections. The rate oscillatorrate oscillator and VCO sections. The rate oscillator

not only determines the cycling rate of each not only determines the cycling rate of each sirensiren

tone, but also generates the control voltage thattone, but also generates the control voltage that

operates the voltage controlled oscillator operates the voltage controlled oscillator (VCO). The(VCO). The

VCO generates a squarVCO generates a square-wave output whose fe-wave output whose fre-re-

quency is directly proportional to the control voltage.quency is directly proportional to the control voltage.

The output of the VCO is coupled to the siren’s The output of the VCO is coupled to the siren’s powerpower

output amplifier.output amplifier.

The siren rate oscillator consists of The siren rate oscillator consists of an LM556an LM556

dual timer configured as two astable oscillators. Thedual timer configured as two astable oscillators. The

first astable oscillator (IC12A) employs analogfirst astable oscillator (IC12A) employs analog

switches (IC10A , IC10B) to select the resistance forswitches (IC10A , IC10B) to select the resistance for

the RC timing network which determines the astablethe RC timing network which determines the astable

oscillator’s cycling rate. IC10C , another analogoscillator’s cycling rate. IC10C , another analog

switch, connects the discharge pin of IC12A to the RCswitch, connects the discharge pin of IC12A to the RC

timing network. When the peak function is called for,timing network. When the peak function is called for,

Figure 5-1. Functional Block Diagram.Figure 5-1. Functional Block Diagram.

-10--10-

the control pin (IC10-6) goes low putting the switchthe control pin (IC10-6) goes low putting the switch

in a high impedance state (OFF), and allows the RCin a high impedance state (OFF), and allows the RC

rate capacitor (C11) to charge as the siren tonerate capacitor (C11) to charge as the siren tone

peaks.peaks.

IC12B, another astable oscillator, generates theIC12B, another astable oscillator, generates the

control voltage required to generate the air-horncontrol voltage required to generate the air-horn

sound. Normally, IC12B is held in the reset statesound. Normally, IC12B is held in the reset state

(IC12-10 low) until the air horn control line is pulled(IC12-10 low) until the air horn control line is pulled

high.high.

IC8C, a one-of-two analog switch, selects theIC8C, a one-of-two analog switch, selects the

siren or air horn control voltage from IC12A orsiren or air horn control voltage from IC12A or

IC12B. IC8B selects either the RC control voltageIC12B. IC8B selects either the RC control voltage

(manual, wail and yelp modes) or the square wave(manual, wail and yelp modes) or the square wave

control voltage (hi-lo) derived from the output ofcontrol voltage (hi-lo) derived from the output of

IC12A. The voltage divider network of IC12A. The voltage divider network of R27, R28, R29R27, R28, R29

and CR8 provides the DC level shifting of the IC12Aand CR8 provides the DC level shifting of the IC12A

output necessary to obtain the desired hi-lo toneoutput necessary to obtain the desired hi-lo tone

frequencies.frequencies.

IC13, a phase-locked loop, contains the voltageIC13, a phase-locked loop, contains the voltage

controlled oscillator. C21, R46, R47, R57, and thecontrolled oscillator. C21, R46, R47, R57, and the

control voltage on pin 9 determine the output fre-control voltage on pin 9 determine the output fre-

quency.quency.



As the siren coasts dowAs the siren coasts down in the manual mode,n in the manual mode,

the output of the VCO must be disabled to the output of the VCO must be disabled to preventprevent

frequencies lower than 350Hz from damaging thefrequencies lower than 350Hz from damaging the

amplifier’s output transistors. IC4D, a voltageamplifier’s output transistors. IC4D, a voltage

comparator, compares the VCO control voltage to comparator, compares the VCO control voltage to thethe

low frequency reference voltage set by R40 and R41.low frequency reference voltage set by R40 and R41.

When the VCO control voltage drops below theWhen the VCO control voltage drops below the

reference, IC4-8 goes high and forces the inhibit pinreference, IC4-8 goes high and forces the inhibit pin

of the VCO high through OR gate IC9D. The VCO isof the VCO high through OR gate IC9D. The VCO is

also inhibited when the radio or also inhibited when the radio or microphone push-to-microphone push-to-

talk input is selected. These logic inputs are talk input is selected. These logic inputs are gatedgated

through IC7B, IC9C and IC9D to the VCO inhibitthrough IC7B, IC9C and IC9D to the VCO inhibit

pin.pin.

5-5-3.3. SISIREREN MN MODODE CE CONONTRTROLOL..

The siren mode is controlled by the The siren mode is controlled by the logic levelslogic levels

applied to J2-3, 5, 6, 7, 8 and applied to J2-3, 5, 6, 7, 8 and J3-1, 2 and 7 (viaJ3-1, 2 and 7 (via

Selector switch SW2), HORN/SIREN switch SW3,Selector switch SW2), HORN/SIREN switch SW3,

and the microphone push-to-talk switch. IC2 buffersand the microphone push-to-talk switch. IC2 buffers

the control inputs. IC3 and IC9 provide most of thethe control inputs. IC3 and IC9 provide most of the

decoding necessary to control the rate oscillator anddecoding necessary to control the rate oscillator and

analog switching of the audio and VCO controlanalog switching of the audio and VCO control

voltages.voltages.

5-5-4.4. TATAP IP II CI CONONTRTROLOL..

As long as power is apAs long as power is applied to the siren cir-plied to the siren cir-

cuitry, the vehicle’s horn ring switch will cuitry, the vehicle’s horn ring switch will be con-be con-

nected through P3-5 and K1A to the inputs of anected through P3-5 and K1A to the inputs of a

window comparator consisting of IC4A and IC4B. Awindow comparator consisting of IC4A and IC4B. A

positive or negative horn ring contact will result positive or negative horn ring contact will result in ain a

logic “1” pulse of equal duration at logic “1” pulse of equal duration at the junction ofthe junction of

CR1 and CR2.CR1 and CR2.

When the siren is in When the siren is in the wail or yelp mode, thethe wail or yelp mode, the

horn ring pulse passes to the horn ring pulse passes to the input of IC6A, is “de-input of IC6A, is “de-

bounced”, and then applied to bounced”, and then applied to toggle flip-flop IC6B.toggle flip-flop IC6B.

Every time the horn ring is operated, the output ofEvery time the horn ring is operated, the output of

IC6B (pin 5) changes state and inverts the state IC6B (pin 5) changes state and inverts the state ofof

the yelp control line. (The exclusive OR gate con-the yelp control line. (The exclusive OR gate con-

tained in IC13 functions as a tained in IC13 functions as a controlled invertercontrolled inverter

where a logic “1” present on pin where a logic “1” present on pin 3 forces the output3 forces the output

(pin 2) to Y or “yelp not”.)(pin 2) to Y or “yelp not”.)

If the Selector switch mode is changed during aIf the Selector switch mode is changed during a

Tap II operation, the circuitry consisting of IC7A,Tap II operation, the circuitry consisting of IC7A,

IC5B and IC7C resets the toggle flip-flop (IC6B) andIC5B and IC7C resets the toggle flip-flop (IC6B) and

allows the true state of the yelp allows the true state of the yelp control line to pass tocontrol line to pass to

the rate oscillator section. This is the rate oscillator section. This is necessary to insurenecessary to insure

that the Selector switch position corresponds to thethat the Selector switch position corresponds to the

audible siren tone produced.audible siren tone produced.

NOTENOTE

The reset circuitry relies on the fact that The reset circuitry relies on the fact that thethe

Selector switch is of the non-shorting type.Selector switch is of the non-shorting type.

When the siren is in the manual mode, andWhen the siren is in the manual mode, and

JU1 and JU2 are left connected to “PEAK” (factoryJU1 and JU2 are left connected to “PEAK” (factory

setting), the window comparator output will besetting), the window comparator output will be

passed through AND gate IC5C to activate the peakpassed through AND gate IC5C to activate the peak

siren function, as long as the horn ring switch issiren function, as long as the horn ring switch is

depressed.depressed.

If manual or hi-lo is If manual or hi-lo is the selected mode and JU1the selected mode and JU1

and JU2 are set to “AIR”, the window comparatorand JU2 are set to “AIR”, the window comparator

output will be passed through AND gate IC5D tooutput will be passed through AND gate IC5D to

activate the air horn override circuitry (refer toactivate the air horn override circuitry (refer to

paragraph 5-2).paragraph 5-2).

5-5.5-5. AUDAUDIO IO SELSELECTECTOR OR AND AND POWEPOWER R AMPLAMPLIFIEIFIER.R.

The siren has two audio inputs: radio rebroad-The siren has two audio inputs: radio rebroad-

cast and microphone public address.cast and microphone public address.

The radio input is derived from direct connec-The radio input is derived from direct connec-

tion to the radio speaker. A fraction of the tion to the radio speaker. A fraction of the audioaudio

voltage developed voltage developed across the radio balance potentacross the radio balance potenti-i-

ometer (R11) is applied to the input of a ometer (R11) is applied to the input of a differentialdifferential

amplifier (IC4C). The differential amplifier elimi-amplifier (IC4C). The differential amplifier elimi-

nates any ground reference problem that may existnates any ground reference problem that may exist

between the PA300 and various makes of radios. Thebetween the PA300 and various makes of radios. The

microphone has a built-in transistor amplifier andmicrophone has a built-in transistor amplifier and

therefore requires no external therefore requires no external pre-amplifier. Resistorpre-amplifier. Resistor

R14 serves as the collector bias R14 serves as the collector bias resistor for theresistor for the

microphone’s amplifier. The microphone output,microphone’s amplifier. The microphone output,

derived from J2-1, and the radio audio from IC4C arederived from J2-1, and the radio audio from IC4C are

selected via 1 of 2 analog selected via 1 of 2 analog switch IC8A. Normally, theswitch IC8A. Normally, the

microphone audio is gated through the multiplexermicrophone audio is gated through the multiplexer

unless the Selector switch is set unless the Selector switch is set to the RADlOto the RADlO

position. The selected audio is applied to IC11-2.position. The selected audio is applied to IC11-2.

IC11 is an audio power amplifier integratedIC11 is an audio power amplifier integrated

circuit which provides the necessary power gain tocircuit which provides the necessary power gain to

drive the push-pull amplifier stages beyond driverdrive the push-pull amplifier stages beyond driver

transformer T1. A biasing network consisting of TH1,transformer T1. A biasing network consisting of TH1,

CR15, Q4, R52, R53 and R54 is activated wheneverCR15, Q4, R52, R53 and R54 is activated whenever

the radio or the microphone push-to-talk switch isthe radio or the microphone push-to-talk switch is

activated. This eliminates all “crossover” distortionactivated. This eliminates all “crossover” distortion

associated with the push-pull output amplifier.associated with the push-pull output amplifier.

5-65-6.. 8-V8-VOLT ROLT REGUEGULALATORTOR, POW, POWER COER CONTRNTROLOL

AND HORN RING TRANSFER.AND HORN RING TRANSFER.

When the GAIN control (on/off switch) isWhen the GAIN control (on/off switch) is

rotated clockwise, B+ is applied to the circuit boardrotated clockwise, B+ is applied to the circuit board

via J3-4 and J4-4. Tvia J3-4 and J4-4. The networks consisting of Che networks consisting of CR4,R4,

C6 and CR10, R36, C17 provide filtering of the B+C6 and CR10, R36, C17 provide filtering of the B+

voltage for the 8-vovoltage for the 8-volt regulator (IC1) and lt regulator (IC1) and the audiothe audio

amplifier (IC11). The large capacitances employedamplifier (IC11). The large capacitances employed

insure that all control logic remains stable andinsure that all control logic remains stable and

prevents “popping” noises heard through the loud-prevents “popping” noises heard through the loud-

speaker when power is turned off.speaker when power is turned off.

Q1, Q2, Q3 and associated components formQ1, Q2, Q3 and associated components form

the power-on control circuitry. This the power-on control circuitry. This network delaysnetwork delays

the activation of K1 the activation of K1 approximately one-second afterapproximately one-second after

B+ is applied. During the interim, all siren B+ is applied. During the interim, all siren controlcontrol

logic stabilizes allowing C15 to charge, bypassing thelogic stabilizes allowing C15 to charge, bypassing the

primary of driver transformer T1. This primary of driver transformer T1. This circuitrycircuitry

suppresses loud turn-on “thumps” from the loud-suppresses loud turn-on “thumps” from the loud-

speaker and allows the vehicle horn ring speaker and allows the vehicle horn ring switch toswitch to

operate the siren’s Tap II feature.operate the siren’s Tap II feature.

-11--11-



SECTION VISECTION VI

SERVICE AND MAINTENANCESERVICE AND MAINTENANCE

SAFETY MESSAGE TO PERSONNEL SERVICINGSAFETY MESSAGE TO PERSONNEL SERVICING

FEDERAL SIGNAL ELECTRONIC SIRENSFEDERAL SIGNAL ELECTRONIC SIRENS

WARNINGWARNING

The lives of people depend on your proper servic-The lives of people depend on your proper servic-

ing of Federal products. It is important to reading of Federal products. It is important to read

and follow all instructions shipped with theand follow all instructions shipped with the

products. In addition, listed below are someproducts. In addition, listed below are some

other safety instructions and precautions youother safety instructions and precautions you

should follow:should follow:

•• ReRead ad anand ud undndererststanand ad all ill insnstrtrucuctitionons in s in ththisis

manual before servicing the electronic sirenmanual before servicing the electronic siren

or speaker.or speaker.

•• To To prpropopererly ly seservrvicice ae an en elelectctroroninic sc siriren en oror

speaker: you must have a good understandingspeaker: you must have a good understanding

of automotive electrical procedures and systems,of automotive electrical procedures and systems,

along with proficiency in the installation andalong with proficiency in the installation and

service of safety warning service of safety warning equipment. Alwaysequipment. Always

refer to the vehicle's service manuals whenrefer to the vehicle's service manuals when

performing service on a vehicle.performing service on a vehicle.

•• ElElecectrtrononic cic cirircucuit ait and snd spepeakaker rer repepaiairs mrs musust bet be

performed by a qualified and competent elec-performed by a qualified and competent elec-

tronic technician.tronic technician.