Williams Sound PERSONAL PA T35 Mode d’emploi

Williams Sound ®

Helping People Hear

PERSONAL PA®T35 Transmitter

Wireless FM Listening System

Transmitter Model PPA T35

Optional Receiver Models PPA R30, R7, R7-4, R19, R19-6

MANUAL AND USER GUIDE

MAN 110 C

Williams Sound ®

Helping People Hear

MANUAL AND USER GUIDE

Contents Page

SYSTEM OVERVIEW 4

QUICK SETUP INSTRUCTIONS 5

DETAILED INSTALLATION INSTRUCTIONS 6

SELECT A LOCATION 6

INSTALLING THE ANTENNA 6

WIRING AND CONNECTIONS 7

REAR PANEL 7

CONNECTING THE POWER SUPPLY 7

AUDIO SOURCE CONNECTIONS 7

CHOOSING AN AUDIO SOURCE FOR THE HEARING IMPAIRED 8

AVOIDING GROUND LOOPS 9

CONNECTING TO A RECORDING DEVICE 9

CONTROLS AND FEATURES 10

FRONT PANEL CONTROLS 10

LCD SCREEN MENUS 12

APPLICATION PRESETS 13

BANDWIDTH 14

FREQUENCY 14

AUDIO SOURCE 15

HIGH PASS FILTER 15

LOW PASS FILTER 16

COMPRESSOR SLOPE 16

COMPRESSOR GAIN 17

RF OUTPUT 18

RECEIVER INSTRUCTIONS 19

WIDEBAND OPTIONS 19

FREQUENCY CHANGE INSTRUCTIONS 21

NARROWBAND OPTIONS 22

RECEIVER MANAGEMENT 24

BATTERY INFORMATION 24

TROUBLE-SHOOTING GUIDE 25

WARRANTY 27

SYSTEM SPECIFICATIONS 28

SYSTEM OVERVIEW

The PPA T35 is an FM Wide-band / Narrow-Band transmitter which operates in the 72-76 MHz

frequency bandwidth. It is designed to be used with battery powered FM receivers:

Compatible Williams Sound receivers include the R30, R7, R7-4 (Wide-Band), and the R19 and

R19-6 (Narrow-band). Please contact Williams Sound Corp. for more information on available

receivers: 800-843-3544. Or, visit us on the web: www.williamssound.com.

Developed for hearing assistance in places of public access, the PPA T35 is designed for

those who need help overcoming background noise, reverberation, or distance from the

sound source. It includes a complete audio processor optimized for the needs of hearing

impaired persons and is easily integrated with your existing sound system. The PPA T35 can

also be used with a microphone as a stand-alone system.

Your PPA T35 transmitter operates much like an FM radio station. The transmitter picks up the

live audio directly from a microphone or sound system. Those sounds are then broadcasted

over an FM radio signal. FM receivers are worn by the listener. The broadcast can be picked

up from up to 500 feet away*. This allows the listener to sit anywhere in the audience and lis-

ten to the broadcast as loud as needed without disturbing anyone else.

Please read through this manual carefully. It includes important setup procedures and guide-

lines for proper operation. If at any time you are having problems with this product, please

contact Williams Sound toll free for assistance: 800-843-3544.

NOTE: FCC regulations, section 15.21, requires the user to comply with the rules of transmitter

operation. Any changes or modifications made by the user not expressly approved for compli-

ance may result in the loss of all privelages and authority to operate the equipment.

Power Phones

Set

Source

Vol um e

Audio

Level

Input

Overload

On Air

–

-3

-6

-9

-12

-15

-18

PPA T35

Sound System

Amplifier

PPA T35 Transmitter FM Receivers

Microphone

Line-Level

Output

Loudspeaker

Digital Frequency Synthesized

WilliamsSound

FIGURE 1: OVERALL SYSTEM DIAGRAM

*Range may be affected by metal structures. 500+ feet is the maximum operating range of the T35

Williams Sound ®

Helping People Hear

Williams Sound ®

Helping People Hear

STEP 1: Position the PPA T35 transmitter near the sound system or mixer from which it will receive audio.

STEP 2: Install the ANT 021 “rubber duckie” antenna. Gently thread the ANT 021 onto the stud recessed in

the hole on the top of the transmitter.

STEP 3: Connect the power supply to the “Power In” connector (Figure 5) located in the back of the T35.

Press in the power button on the front of the T35. The “On Air” green LED indicator should

illuminate. If not, go back and check the power connections.

STEP 4: Select an application. The T35 has three pre-configured Appl-

ication Presets to choose from: Hearing Assist, Music and Voice.

The performance of the T35 is optimized for each selected

application. Using the menu control buttons on the front of the

T35 (Figure 2), press the “ “ button to access the “Application

Presets” LCD screen.

Press the “+” and “-” menu buttons to

alternate between Hearing Assist, Music and Voice selection.

When the desired Application Preset is displayed, press the

“Set” button to save the change into memory.

STEP 5:

The T35 is shipped from the factory in wideband mode with

the frequency set to 72.900 MHz. To change the frequency or

bandwidth on the T35, refer to the instructions on page 14.

STEP 6: Configure the T35 for the appropriate audio source. Using the

menu control buttons on the front of the T35 (Figure 2), press the

“ “ button to access the “Audio Source” LCD screen. Using the

“+” and “-” menu buttons (Figure 2), choose between MIC, SIM-

PLEX-MIC, or LINE. When the desired audio input is displayed, press

the “Set” button to save the change into memory. Lastly, con-

nect the audio source to the audio input jack in the rear of the

T35 transmitter.

STEP 7: With the audio source playing, adjust the Audio Level control on

the T35 so that the green “0 dB” LED generally lights and the red

“+9 dB” LED lights occasionally: Press the Audio Level “+” button

to increase the audio level in .5dB steps. Press the Audio Level “-”

button to decrease the audio level in .5dB steps. See Figure 3.

STEP 8: Listen with an FM receiver (see pages 19-23 for compatible Williams Sound receivers). Install the

batteries, plug in the earphone, turn on the receiver and walk around the listening area. The sig-

nal should be clear and quite loud when the volume is turned up.

IMPORTANT: The FM receiver being used with the T35 transmitter will need to be on the same

frequency and bandwidth as the transmitter. To retune the receiver, see page 21.

Please read through this manual carefully for detailed instructions and setup procedures.

FIG. 2: LCD Menu Controls

Front panel of the T35

Set

FIG. 3: Audio Input Controls

Front panel of the T35

Audio

Level

Input

Overload

–

-3

-6

-9

-12

-15

-18

QUICK SETUP INSTRUCTIONS

Williams Sound ®

Helping People Hear

SETTING UPTHE T35 - DETAILED INSTRUCTIONS

SELECT A LOCATION

The transmitter is usually located near the sound system amplifier or mixer for easy access to

an audio output signal. Position the transmitter on a level surface. It should be free from metal-

lic objects that might interfere with the antenna signal.

For permanent installation, the PPA T35 transmitter can be rack mounted. Use the Williams

Sound RPK 005 or RPK 006 rack mount kits. Make sure there is good electrical contact

between the transmitter chassis and the rack cabinet.



NSTALL THE

ANT 021 A

NTENNA

NOTE: If the T35 is going to be rack mounted, you will not be able to install the ANT

021 “Rubber Duckie.” For rack mounting, consider installing a remote antenna (see

following section).

The PPA T35 is shipped with a flexible antenna (ANT 021). The ANT 021 threads onto

a stud recessed in a hole on the top the transmitter. Screw the antenna clockwise

until the connection is secure (Figure 4). Do not use excessive force to tighten the

antenna. For operating the T35 in remote locations, a coaxial antenna (ANT 005) or

Wall Mount Dipole antenna (ANT 024) can be installed. The external antenna jack is

located at the rear of the T35 transmitter (Figure 4). The external antenna imped-

ance is 75 ohms.

REMOTE ANTENNA TIPS:

Position the ANT 005 or ANT 024 antenna so the elements are vertical. The last 80 inch-

es of the ANT 005 contain the elements. DO NOT install the antenna elements hori-

zontally. The antenna should be placed as close to the listening area as possible (10

to 15 feet above the floor). DO NOT install the antenna directly above the listening

area. There is a null in the coverage area off the ends of the antennna. DO NOT install

the antenna around any significant amount of metal material; this may deflect and

absorb the radio signal.

The ANT 005 and ANT 024 cables are classified as Class II wiring and may be installed in

conduit with other Class II wiring. The antenna SHOULD NOT be installed with Class I

(power) wiring. DO NOT connect the coaxial cable to the building or electrical ground

in any way.

Included:

ANT 021 "Rubber Duckie" Antenna

Optional:

Coaxial Antenna (ANT 005) or

Wall Mount Dipole (ANT 024)

FIG. 4:

INSTALLING THE ANTENNA

(T35 REAR VIEW)

Williams Sound ®

Helping People Hear

POWER SUPPLY CONNECTION FOR U.S. APPLICATION

Connect the TFP 016 power supply to the “Power In”

jack located on the rear of the T35 transmitter.

NOTE: The power on the T35 will not be activated until the power

button on the front of the T35 is pressed into the “on” position.

AUDIO SOURCE CONNECTIONS

The T35 transmitter will accept the following audio sources:

1) Balanced Microphone on a 3-pin (XLR) connector without simplex power.

Balanced Microphone with 12 volt simplex power (DIN 45596) on a 3-pin (XLR) connector.

3) Balanced/Unbalanced microphone without power on 1/4 inch jack

4) Balanced/Unbalanced Line on a 3-pin (XLR) connector.

5) Balanced/Unbalanced Line on 1/4 inch jack.

NOTE: The T35 is not designed to accept 70 volt speaker wire. The sound source should

come directly from the system mixer or amplifier as an unprocessed signal.

IMPORTANT: When a suitable audio source has been selected, you MUST configure the audio

source controls on the front panel of the T35. There are three possible selections to choose

from: MIC, SIMPLEX-MIC and LINE. SEE PAGE 15 FOR AUDIO SOURCE CONTROLS. After the

audio source selection has been made, plug in the appropriate audio source into the “Audio

Input” jack in the rear of the T35.

FIG. 5: REAR VIEW OF T35

TFP 016

Power

Supply Plug

WIRING AND CONNECTIONS

Williams Sound ®

Helping People Hear

In Phase

Balanced Line Usin

1/4' Connector

Unbalanced Line Usin

1/4" Connecto

4.7 K

Source A

Source B

Connecting to a Multi-Channel or

Stereo Source

In Phase

From Microphone

3 Pin Connector

Low Impedance Microphone

In Phase

3 Pin Connector

Balanced Line Usin

3–Pin Connecto

3 Pin Connector

Unbalanced Line Using

3–Pin Connector

FIGURE 6: AUDIO SOURCE CONNECTORS

SELECTING AN AUDIO SOURCE APPROPRIATE FOR HEARING IMPAIRED LISTENERS

If the T35 is going to be used specifically for the accommodation of hearing impaired lis-

teners, we recommend following these general guidelines:

The PPA T35 transmits audio with excellent fidelity. Therefore, the audio source signal

should be of the highest audio quality and not subject to a compressor, limiter, rever-

beration, or other signal processing equipment. The T35 has an effective audio proces-

sor. If compression is desired in the audio, refer to pages 16-17 for features and controls.

Excessive compression is not helpful to the hearing impaired and can contribute to

excessive noise in the receiver outputs.

The T35 audio source signal is usually connected to a mixer’s “line output” signal which is

behind the mixer’s parametric equalizers but ahead of any equalization used for house

loudspeakers.

If audio delay is available for use in large auditoriums, it’s usually best to use it. Because

radio signals travel faster than sound, delaying the transmitted audio so that an average

listener (in the middle of the listening area) hears the transmitted audio a few millisec-

onds after audio from the main sound reinforcement system speaker is helpful. This will

also help audience members who lip read.

MULTI–CHANNEL SOURCES

By constructing a simple resistive mixer, stereo (or 3 channel) sources can be connect-

ed to the T35. Additional channels can be accommodated by adding a resistor for

each source. Necessary resistors can be obtained from Williams Sound (Part Number

RFC 472) or from any local electronics parts supplier. See Figure 6.

Williams Sound ®

Helping People Hear

AVOIDING HUM IN THE AUDIO (AS A RESULT OF A GROUND LOOP)

A hum created by a ground loop can often be eliminated by connecting a capacitor in

series with the audio line shield to the transmitter’s ground. This method also maintains

good RF shielding. Determining the effectiveness of this method for your installation usu-

ally requires some experimentation. See Figure 7.

CONNECTING THE T35 TO A RECORDING DEVICE

Use the Audio Line Out jack for monitoring, recording, or routing processed audio to

another sound system.

.01 uF Ceramic

Disc Capacitor

In Phase

3–Pin Connector

.01 uF Ceramic

Disc Capacitor

Breaking A Ground Loop when

Connecting to a

Unbalanced

Line

Breaking A Ground Loop when

Connecting to a

Balanced

Line

FIGURE 7: CONNECTING TO A BALANCE/UNBALANCED LINE

FIGURE 8: AUDIO LINE OUTPUT

Audio Line Out Audio Line In

Recording Devic

PPA T35

Williams Sound ®

Helping People Hear

POWER BUTTON

Push-button switch turns the transmitter on or off. The wall mounted power supply stays on

at all times.

ONAIR INDICATOR

Indicates when power is on and radio frequency is transmitting.

AUDIO LEVEL INDICATOR

The bar graph indicator shows audio level in 3dB steps at the input of the audio level process-

ing circuit. The indicator is peak responding and is calibrated so that optimum level is reached

when the 0dB LED generally lights and +9dB lights occassionally. Use the Audio Level controls

to set the audio levels.

INPUT OVERLOAD INDICATOR

A red LED indicator will illuminate each time the audio signal exceeds the capacity of the input

circuit. (The source of the audio coming in to the T35 needs to be adjusted to correct this.)

NOTE: Direct Access Buttons (Figure 9) allow the user to change configurations on the transmit-

ter immediately without having to scroll through the menu controls (Page 12). When a direct

access button is pressed, the change is immediately displayed on the LCD Menu Display.

AUDIO LEVEL (DIRECT ACCESS)

Pressing or holding down the Audio Level “+” button increases the audio input level in .5dB

steps. Pressing or holding down the audio level “-” button decreases the audio input level in

.5dB steps. Holding down an Audio Level button continuously will automatically increase or

decrease the audio input in .5dB increments until the button is released or the upper and lower

limits are reached. Each action is immediately displayed on the LCD default display (Figure 9).

Power

Phones

Set

Source

Vol ume

Audio

Level

Input

Overload

On Air

–

-3

-6

-9

-12

-15

-18

PPA T35

Direct Access

Buttons

Direct Access

Buttons

Power

Button

Menu Control

Buttons

LCD Menu

Display

Digital Frequency Synthesized

FIGURE 9: PPA T35 FRONT VIEW

CONTROLS &F

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