Williams Sound PERSONAL PA System 500 Fehlerbehebungshandbuch

Installation

Guide &

User

Manual

PERSONAL PA System 500

Narrow-Band FM Wireless Listening System

Transmitter Model T20

Williams Sound ®

Receiver Model R19/*, R19-4A, R19-6

Helping People Hear

MAN 062B

PERSONAL PA SYSTEM 500

Installation and User Manual

Contents Page

Overview 4

Narrow-Band Basics 5

Controls and Features 6

System Set-Up and Operation

Antenna Connection

Power Connection

Audio Connection

Using a Microphone

T20 Audio Processor Options

Using R19/R19-4/R19-6 Receivers

Adjusting Receiver Tone Controls

Battery & Charger Information

Receiver Management Suggestions 14

Using a Remote Antenna 15

Troubleshooting Guide 16

Radio Interference / Tuning Instructions 18

Warranty 19

System Specifications 20

Williams Sound ®

Helping People Hear

Overview

Thank you for purchasing the Personal PA System

500 from Williams Sound Corp. The PPA System

500 is a Narrow-Band FM Listening System which

operates in the 72-76MHz frequency band. Designed

for hearing assistance in places of public access, the

PERSONAL PA System 500 is for those who need

help overcoming background noise, reverberation, or

distance from the sound source. The versatile PPA

500 is easily integrated with your existing sound

system or can be used with a microphone as a stand-

alone system.

Your PPA System 500 has two principal parts: the

T20 Transmitter and the R19, R19-4, or R19-6

Receivers. Much like a miniature radio station, the

transmitter and microphone pick up the sounds you

want to hear and broadcast them over an FM radio

signal. The receivers are used to pick up the

broadcast up to 500 feet away.

To avoid difficulties, please read through this manual

as you begin to use the system. Then save it for

questions that arise as you continue to use your

PERSONAL PA System 500.

If you have any problems with this Williams Sound

product, don’t hesitate to call us toll-free at

1-800-843-3544.

Sound System Amplifier

Loudspeakers

Microphones

Line-Level Output

Line-Level Input

T20 Transmitter

Tape Out/Phones

Audio Level

HiOk

Power

FM Auditory AssistanceTransmitter

Adjust

Williams Sound

WB NBOn

Transmit Status

R19 / R19-4 / R19-6 Narrow-Band

Receivers w/Earphones

Figure 1: Overall System Diagram

Williams Sound ®

Helping People Hear

Narrow-Band Basics

Less Interference

All FM receivers are tuned to a specific carrier

frequency. The selectivity of the receiver determines

how close nearby radio signals can be to this carrier

frequency before interference occurs. True narrow-

band receivers like the Williams Sound R19 use

dual-conversion circuitry to achieve a very narrow

“window” of acceptance for radio signals. This

allows them to operate in areas that have a lot of

different radio signals with less likelihood of

receiving interference.

More Simultaneous Channels

This narrow window of acceptance means more

channels can be squeezed into the designated

frequency band. Instead of dividing the Auditory

Assistance Band (72-76MHz) into 10 wide channels

(wide-band), the same band can be divided into 40

closely spaced (narrow-band) channels. The

selectivity of the R19 dual conversion receiver

allows you to operate on these closely-spaced

channels without interference from the next channel.

Greater Operating Range

Another measure of FM receiver performance is

sensitivity, measured by the weakest radio signal that

the receiver can respond to and still operate properly.

All hearing assistance transmitters are limited by

FCC Rules to the same transmitted signal strength,

so you can’t boost transmitter power or antenna

efficiency to get more operating distance. The

farther you move from the transmitting antenna, the

weaker the signal becomes. A very sensitive receiver

like the R19 will allow greater operating distance.

Because of its excellent operating distance, the PPA

System 500 can be used in situations where

maximum coverage area is needed.

Sound Quality

Narrow-band systems give up some frequency

response (extended highs and lows) and noise

performance compared to wide-band systems. This

is usually not a drawback for spoken word

presentations, but may not be optimal for programs

which are primarily music.

Manufacturers often list a minimum signal strength

needed to maintain an acceptable noise level in the

receiver before it “squelches” or goes quiet. The

Williams Sound R19 receiver is designed to offer

maximum sensitivity with minimum noise and a

reasonable squelch action.

Overload Protection

Making a receiver sensitive for greater reception of

weak signals can create a problem when the receiver

is used in an area that has strong radio signals.

Unless the receiver has a superior dynamic range, it

can be overloaded by the strong signal and become

noisy, distorted, or vulnerable to interference. The

Williams Sound R19 receiver uses state-of-the-art

circuitry for improved RF dynamic range.

Capture Effect

When an FM receiver is presented with two radio

signals on the same channel, it will “lock on” to

whichever signal is stronger. This is called the

“capture effect.” Because signal strength is related to

distance, this usually means that the closest

transmitter antenna will produce the strongest signal

and “capture” the receiver.

Williams Sound ®

Helping People Hear

Controls and Features

Receiver Model R19 Transmitter Model T20

EAR Jack See Figures 3 and 4.

Mono 3.5 mm mini earphone jack

Off/On Indicator Light

Red LED which indicates receiver is “on” when lit.

If the batteries are near end of life and the LED turns

off while the receiver is operating, approximately

one hour of battery life remains.

Tone Control

3-position switch which cuts low frequencies at certain

thresholds: (Lo: 20 Hz, Mid: 120 Hz, Hi: 700 Hz)

Volume/On-Off Control

Combination volume and on-off rotary control.

Channel Slide Switch

2-position slide switch used to alternate between two

pre-set narrow-band frequencies. Standard channels

are 33 and 53. See page 18 for instruction on

changing system frequencies.

EAR Channel

1 2

Volume

Lo HiMid

Off Max

Tone

Figure 2: R19 Receiver Controls

EAR Jack

Mono 3.5 mm mini earphone jack

Off/On Indicator Light

Red LED which indicates

receiver is “on” when lit.

Tone Control

Three-position switch which cuts low

frequencies at certain thresholds:

Volume/On-Off Control

Combination volume and on-off rotary

control.

Channel Slide Switch

2-position slide switch used to

alternate between two pre-set

narrow-band frequencies.

Williams Sound ®

Helping People Hear

Figure 3: T20 Front Panel Controls & Features

Audio Indicators: Tape Out/Phones:

Amber LED "Ok" for nominal input signal level 1⁄4" jack, 600 mV, 100 Ωsource impedance. Also drives

Red LED "Hi" for excessive input signal level mono or stereo headphone. Monitors exactly what is being

transmitted.

FM Auditory AssistanceTransmitter Williams Sound

Power Audio Level Transmit Status

- + Tape Out/Phones

Ok Hi Adjust On WB NB

Power Indicator: Audio Level Control: RF Indicators:

Green LED Rotary pot, screwdriver adjust, Green LED "On" indicates transmitter RF is on

used with audio indicator lights Amber LED "WB" indicates wide–band channel is selected

Amber LED "NB" indicates narrow–band channel is selected

Figure 4: T20 Rear Panel Controls & Features

Audio Inputs: Unbal. Audio Inputs: Remote Antenna Output:

All inputs are actively mixed into a single Four screw terminals, three unbalanced F-type connector for 75 ΩCoaxial

signal, allowing use of mono, stereo, line-level inputs, Antenna (ANT 005) uses RG-59 cable.

Balanced Audio Input

Line

Mic 70V

FM Auditory AssistanceTransmitter

Select

Unbalanced

Audio Inputs

20 Hz

175 Hz

725 Hz

Hi-Pass Filter

Antenna

Power: 24 VAC, 60 Hz, 10VA

RF Power

75 Ohm

Made in USA Williams Sound Corp.

Channel

COM IN 1 IN 2 IN 3

-12dB Max-6dB

1st

Digit

2nd

Digit

Use with TFP 016

Power Supply

Balanced Audio Input:

Combination 3-pin female

XLR/1/4" stereo jack, accepts

balanced or unbalanced microphone

and line level inputs, 25 V or 70 V

audio input

Input Selector Switch:

3-position slide-type, selects: mic/line/70 V

on combination XLR/Phone audio input

one ground, actively mixed

High-Pass Filter Switch:

3-position slide-type,

20 Hz, 175 Hz, or 725 Hz,

6 dB / octave roll-off

RF Output Switch:

3-position slide-type,

Full power, -6 dB, -12 dB

Power

Connection:

3-pin, Molex

connector for TFP

016 power supply

Channel Selector:

2 rotary switches set the operating

frequency

3 channel or 4 channel audio sources

jack

Williams Sound ®

Helping People Hear

Set-up & Operation

T20 Transmitter

Step 1: Install the antenna.

The “rubber duck” whip antenna fits into

the hole on top of the transmitter and

threads onto a mounting stud inside.

Guide the antenna onto the stud and turn it

clockwise to tighten. Do not use excessive

force to tighten the antenna. It only needs

to be finger-tight.

If the optional remote antenna (ANT 005)

is more appropriate, contact your dealer or

Williams Sound Corp. The remote antenna

installation is detailed on page 15.

Step 2: Connect the Transmitter to Power.

The T20 is supplied with a wall

transformer power supply (TFP 016). Plug

the power cord into the “Power” connector

on the rear panel of the T20. Then plug the

transformer into a 120 V, 60 Hz wall

outlet. The indicator light on the front

panel of the T20 should glow when the

power is connected.

There is no ON/OFF switch. Due to low

energy consumption, the T20 is

designed to run continuously.

The wall transformer can be plugged into

a switched outlet that turns on when the

other sound equipment is turned on. If

turning the T20 on creates a hum or buzz

in the sound system, see the

Troubleshooting Guide on page 16.

Step 3: Make audio connections.

Step 3a: (If you will be using the T20 with an

existing sound system)

Refer to the Overall System Diagram, on

page 4. The T20 has been designed to

accept virtually any type of audio input,

with up to four different input signals

actively mixed together. The best sources

for audio signal from sound system are as

follows:

1st Choice: TAPE OUT or LINE OUT

2nd Choice: BOOSTER or BRIDGING

3rd Choice: Speaker Terminal, or

Speaker Transformer tap

Input connection options for the T20

transmitter are as follows:

Balanced Audio Input Concentric Jack:

1. Accepts balanced and unbalanced

XLR or TRS 1/4" Mic-Level or

Line-Level Inputs

2. Accepts balanced and unbalanced

Mic-Level or Line-Level Inputs

3. Accepts balanced and unbalanced

Speaker-Level Inputs

(25V, 70V speaker line)

See Figure 6 for connection details.

Use the audio cable and adaptor supplied

to connect the T20 “Audio In” jack to an

appropriate audio output jack on the sound

system mixer or amplifier. (See Figure 4.)

If your amplifier or mixer does not have

RCA-type connectors, you can obtain

adaptors from your Authorized Williams

Sound Dealer or a local radio parts store.

Williams Sound ®

Helping People Hear

RCA to 1/4" Adapter

To T20 Concentric Jack

RCA to RCA Cable

From Sound System Line Output

Figure 5: Using The Audio Cable Supplied With The System

Shield Grounded As Required

Balanced Line 2 1

Male XLR Connector

To T20 Input LINE

MIC 70 V

Shield Grounded To Amplifier

4, 8, 0r 16 Ohm

Speaker Line

2 1

Male XLR Connector

To T20 Input LINE

MIC 70 V

Shield Grounded To Amplifier

25 or 70 Volt

Speaker Line

2 1

Male XLR Connector

To T20 Input LINE

MIC 70 V

Shield Grounded As Required

Balanced

Line

LINE

MIC 70 V

1/4in. 2-Conductor

Phone plug to T20 Input

1/4in. 2-Conductor

Phone plug to T20 Input LINE

MIC 70 V

Unbalanced

Line

Unbalanced

Dynamic Mic

Battery Powered

Condenser Mic

LINE

MIC 70 V

1/4in. 2-Conductor

Phone plug to T20 Input

Dynamic Low

Impedance

Balanced Mic

Simplex Powered

Condenser Mic

or Dynamic Mic

2 1

Male XLR Connector

To T20 Input LINE

MIC 70 V

Figure 6: Audio Connection Wiring Detail

Williams Sound ®

Helping People Hear

If the TAPE OUT jack is already in use, a Step 6: Set the RF Power Switch.

Y-Cord can be used to connect the T20

and a second device to the same jack.

Unbalanced Audio Input Terminals:

Accepts one to three unbalanced line-level

signals, which are actively mixed. The

three inputs share a common ground

connection.

Step 3b: (If you will be using the T20 with a

microphone as a stand-alone system)

Plug the microphone into the concentric

jack (“Balanced Audio Input”) on the rear

panel of the T20. The T20 supplies

positive DC voltage to power condenser

microphones per DIN45596. (Standard

dynamic microphones may also be used.)

Make sure the input selector switch is in

the MIC position. Talking into the

microphone should cause the audio

indicator light to flash on the front panel.

If you use both the Microphone input and

the Audio Input on the T20, the signals

will be mixed.

Step 4: Set the Input Selector Switch.

If you are using the combination XLR/

phone plug input jack, make sure the

selector switch is set in the proper position

as shown in Figure 6.

Step 5: Set the Hi-Pass Filter Switch.

The High-Pass Filter switch is used to

reduce low frequencies. It is normally

used in the middle (175 Hz) position to

provide high frequency emphasis that

improves speech understanding for hard of

hearing listeners. If the program content is

primarily musical, it can be used in the left

(20 Hz) position. The right position

(725 Hz) may be used for further low

frequency reduction, or it may be used to

reduce low frequency system noise due to

pick up of ventilation system noise, etc.

In some situations, the radio signal

produced by the transmitter can enter

other types of equipment and create a hum

or buzzing sound in the sound system.

This is due to poor RF protection in the

other equipment, NOT a problem with the

transmitter.

The normal switch position is MAX

power (right).

If you encounter a hum or buzz in the

sound system when the T20 is turned on,

move the switch to the -6 dB (middle

position). If the buzz diminishes, but

persists, move the switch to the -12 dB

(left) position. If this does not solve the

problem, refer to the Troubleshooting

Guide on page 16.

However, if the amount of buzz does not

change when the RF power switch is

moved from MAX to -12 dB, the buzz is

not related to RF interference from the

T20.

The system range is decreased when

power is reduced, but usually still covers

the entire seating area.

Step 7: Use a receiver to test the system and set

the input level control.

Williams Sound ®

Helping People Hear

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