Williams Sound T35, PPA T35 Manual And User Manual

Williams Sound

®

Helping People Hear

MANUAL AND USER GUIDE

PERSONAL PA™T35 Transmitter

Wireless FM Listening System

Transmitter Model PPA T35
Optional Receiver Models PPA R7, R7-4, R19, R19-6, R35, R35-8

MAN 110 G

PERSONAL PA™T35 TRANSMITTER

Williams Sound

®

Helping People Hear

MANUAL AND USER GUIDE

CONTENTS PAGE

SYSTEM OVER

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

VIEW

QUICK SETUP INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

DETAILED INSTALLATION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

SELECT A LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

INSTALLING THE ANTENNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

WIRING AND CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

REAR PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

CONNECTING
A

UDIO SOURCE CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

HOOSING AN AUDIO SOURCE FOR THE HEARING IMPAIRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

C

AVOIDING GROUND LOOPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

CONNECTING TO A RECORDING DEVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

THE

POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

7

SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

RECYCLING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

RECEIVER INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

WIDEBAND OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

FREQUENCY CHANGE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

NARROWBAND OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

R

ECEIVER MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

BATTERY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

TROUBLE-SHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

SYSTEM SPECIFICA

TIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32

3

SYSTEM OVERVIEW

Williams Sound

®

Helping People Hear

Power

Phones

Set

Source

Volume

Audio
Level

Input

Overload

On Air

+

–

+9
+6

+3

0

-3

-6

-9

-12

-15

-18

^

^

+

-

-

+

PPA T35

Sound System
Amplifier

PPA T35 Transmitter

FM Receivers

Microphone

Line-Level
Output

Loudspeaker

Digital Frequency Synthesized

Williams Sound

Williams Sound

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

Please read through this manual carefully. It includes important setup procedures and guidelines 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 compliance may result in the loss of all
privileges and authority to operate the equipment.

FIG. 1: OVERALL SYSTEM DIAGRAM

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

4

Williams Sound

®

Helping People Hear

FIG. 2: LCD Menu Controls

Front panel of the T35

Set

^

^

-

+

FIG. 3: Audio Input Controls

Front panel of the T35

Audio

Lev

el

Input

Overload

+

–

+9

+6

+3

0

-3

-6

-9

-12

-15

-18

QUICK SETUP INSTRUCTIONS

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

STEP 2: Install the ANT 025 whip antenna. Gently thread the ANT 025 onto the stud recessed in

the hole on the top of the transmitter. For best performance, extend the antenna to its maximum height (39”).

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 Application Presets

to choose from:
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.
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.

Hearing Assist, Music and Voice. The performance of the

^

Press the “+” and “-” menu

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 con-

^

trol 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, SIMPLEX-MIC, or LINE.
When the desired audio input is displayed, press the “Set” button to save
the change into memory. Lastly, connect 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 20-26 for compatible Williams Sound receivers). Install the batteries,

plug in the earphone, turn on the receiver and walk around the listening area. The signal 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

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

o retune the receiver

T

.

, see page 24.

5

Williams Sound

®

Helping People Hear

SETTING UP THE T35 - DETAILED INSTRUCTIONS

Included:

ANT 025 Whip Antenna

Optional:

Coaxial Antenna (ANT 005) or
Wall Mount Dipole (ANT 024)

þ

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 metallic 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.

þ

INSTALL THE ANT 025 WHIP ANTENNA

NOTE: If the T35 is going to be rack mounted, you will not be able to install the ANT 025 whip antenna.
For rack mounting, consider installing a remote antenna (see following section).

The PPA T35 is shipped standard with a single ANT 025 whip antenna. The ANT 025 threads on to a stud
recessed in a hole on the top of the transmitter. Screw the antenna clockwise until the connection is
secure (Figure 4). Do not use excessive force to tighten the antenna. For maximum performance, extend
the ANT 025 antenna to its max. height of 39”. 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 impedance is 75 ohms.

FIG. 4: INSTALLING THE ANTENNA

(T35 REAR VIEW)

þ

REMOTE ANTENNA TIPS:

Position the ANT 005 or ANT 024 antenna so the elements are vertical. The last 80 inches of the ANT

The antenna should be

install the antenna elements horizontally

005 contain the elements. DO

NOT

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 anten­na. 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.

6

Williams Sound

®

Helping People Hear

WIRING AND CONNECTIONS

FIG. 5: REAR VIEWOFT35

þ

POWER SUPPLYCONNECTION

Connect the

TFP 016 power supply to the “Power In” jack located

FOR

U.S. APPLICA

TION

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.

2)

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.

ARNING:

W

our system. The sound source should come directly from the system mixer or amplifier as an

to y
unprocessed signal.

The T35 is not

designed to accept 70 volt speaker wire! This may result in damage

TFP 016

Power

Supply Plug

NOTE:
with a

If using a

WCA 083 electret adapter. The T35 will not supply simplex (phantom) power through the 1/4” jack

Williams Sound MIC 044 headset microphone with a 3.5mm plug, you MUST

without an adapter.

IMPORTANT: When a suitable audio source has been selected, you MUST
controls on the front panel of the T35. There are three possible selections to choose from: MIC, SIMPLEX­MIC and LINE. SEE

PAGE 15

has been made, plug in the appropriate audio source into the “Audio Input” jack in the rear of the T35.

use it

configure the audio source

FOR AUDIO SOURCE CONTROLS. After the audio source selection

7

Williams Sound

®

Helping People Hear

In Phase

Balanced Line Using 1/4' Connector

Unbalanced Line Using 1/4" Connector

4.7 K

4.7 K

Source A

Source B

Connecting to a Multi-Channel or

Stereo Source

In Phase

From Microphone

1

2

3

3 Pin Connector

Low Impedance Microphone

In Phase

3 Pin Connector

12

3

Balanced Line Using 3–Pin Connector

3 Pin Connector

1

2

3

Unbalanced Line Using

3–Pin Connector

FIG. 6: AUDIO SOURCE CONNECTORS

MULTI–CHANNEL SOURCES

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

SELECTING AN AUDIO SOURCE APPROPRIATE FOR HEARING IMPAIRED LISTENERS

If the T35 is going to be used specifically for the accommodation of hearing impaired listeners, 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, reverberation, or other signal processing
equipment. The T35 has an effective audio processor. If compression is desired in the audio, refer to
page 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.

s “line output” signal which is behind the

T35 audio source signal is usually connected to a mixer

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 milliseconds after audio from the main sound reinforce
ment system speaker is helpful.

This will also help audience members who lip read.

’

-

8

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

Williams Sound

®

Helping People Hear

.01 uF Ceramic
Disc Capacitor

I

n Phase

3–Pin Connector

.01 uF Ceramic
D

isc Capacitor

12

3

B

reaking A Ground Loop when 

Connecting to a Unbalanced Line

B

reaking A Ground Loop when 

Connecting to a Balanced Line

Audio Line Out Audio Line In

Recording Device

PPA T35

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 usually requires some experimentation. See Figure 7.

FIG. 7: CONNECTING TO A BALANCE/UNBALANCED LINE

CONNECTING THE T35 TO A RECORDING DEVICE

Use the Audio Line Out jack for monitoring, recording, or routing processed audio to another sound system.

FIG. 8: AUDIO LINE OUTPUT

9

Williams Sound

®

Helping People Hear

Power

Phones

Set

Source

Vol ume

Audio

Level

Input

Over

load

On Air

+

–

+9

+6
+3

0

-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

CONTROLS &FEATURES

FIG. 9: PPA T35 FRONT VIEW

POWER BUTTON

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

ON AIR 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 processing circuit.
The indicator is peak responding and is calibrated so that optimum level is reached when the 0dB LED
generally lights and +9dB lights occasionally. 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.)

e 9) allow the user to change configurations on the transmitter immediately

igur

NO

TE:

Dir

Access Buttons

ect

(F
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.

Audio Level button continuously will automatically increase or decrease the audio

Holding down an
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 10).

10

PHONES JACK AND SOURCE BUTTON

Operating Frequency

Audio Input Level

Menu Screen Number

Transmitting Power

Menu Lock Icon

Application Preset

Williams Sound

®

Helping People Hear

A headset plugged into the “Phones” jack allows monitoring either the audio output as it is processed
and transmitted by the T35 or the T35 audio input before it gets processed. By default, the phone jack
audio is set for “TRANSMITTED” audio. Pressing and holding down the “Source” button will select
“INPUT” audio. The setting is immediately displayed on the LCD menu screen. Releasing the
“Source” button will immediately return the selection to “TRANSMITTED” audio. If there is no
further action by the user, after five seconds, the LCD menu screen will return to the default display
(Figure 10).

HEADPHONE VOLUME (DIRECT ACCESS)

The headphone level can be increased or decreased by using the “Volume” direct access buttons next to
the headphone jack. Pressing or holding down the volume control “+” button increases the headphone
level in +0.5dB steps. Pressing or holding down the volume control “-” button decreases the head­phones level in -0.5dB steps. Holding down a Volume button continuously will automatically
increase/decrease the input level in .5dB increments until the button is released or the limit is reached.
Each action is immediately displayed on the LCD menu screen as the buttons are pressed. If there is no
further action by the user, after five seconds, the LCD menu screen will return to the default display
(Figure 10).

LCD MENU DISPLAY

The LCD display is used with the menu control buttons for configuring and setting up the T35.
When the power of the unit is first turned on, the LCD screen displays a “Williams Sound” start-up
screen. (NOTE: If the transmitter is not fully functional, the transmitter will stay on the start-up screen
and the transmitter will not transmit.) After seven seconds, the “On Air” LED will illuminate and the
default screen will be displayed (Figure 10). The T35 is now fully operational. If the “On Air” indica­tor does not illuminate, go back and double-check the connections (page 7). Make sure the power supply
is properly installed, and the power button is in the “on” position.

The default display will always show the following information: Operating Frequency
Audio Input Level, Transmitting Power and Application Preset. In some cases the Menu Lock Icon
will be displayed. This indicates that the menu screens (page 12) are locked, which prevents any func­tions from being accidentally changed (except for the direct access functions).
menu screens, press and hold the SET button on the front of the T35 for five seconds. NOTE: This will
only work from the default display.

FIG. 10: DEFAULT DISPLAY MENU

, Bandwidth,

o lock or unlock the

T

11

Williams Sound

®

Helping People Hear

LCD SCREEN MENUS (QUICK REFERENCE)

Digital Frequency Synthesized

PowerPower

Phones

Phones

SourceSource

Vol ume

Audio

Lev

el

InputInput

Overload

On AirOn Air

++

–

–

+9

+9

+6+6

+3+3

0

0

-3-3

-6-6

-9-9

-12-12

-15-15

-18-18

--

+

+

PPA T35

Set

^

^

-

+

Default

Audio Source

High Pass Filter

Low Pass Filter

Compressor Slope

Compressor Gain

RF Output

LED Menu Controls

Frequency

Bandwidth

Application Presets

The first screen (M0) gives important overall system settings. The following nine menu screens (M1-M9) are
used to configure and setup the T35. To make a screen selection, navigate to the desired LCD menu by press­ing the “ ” (down) button on the front of the T35. Press the “Set” button to save the change into memory.
Any changes not “set” will be lost. After 30 seconds of inactivity, the LCD will return to the default display.

FIG. 11: SELECTING AN LCD MENU

^

12

Williams Sound

®

Helping People Hear

Set

^

^

-

+

LCD Menu Controls

FIGURE 12:

Front panel of the T35

LCD SCREEN MENUS (DETAILED)

APPLICATION PRESETS (M1)

The Application Presets screen allows the user to quickly and easily configure the T35 for common applica­tions. In some cases, the Application Presets will be the only setup needed for properly configuring the T35
transmitter.

There are three Application Presets to choose from:

Hearing Assist, Music and Voice. When one of these

selections is “set,” the performance of the T35 is immediately optimized for the needs of that application (an
adjustment is automatically made to the Low/High Pass Filter, and Compressor Slope controls). Refer to the
chart below for a comparison of the Application Preset configurations.

By default, the T35 is shipped
highest audio quality is desirable,
applications, or applications where the message is critical for listening,
mode of operation. For speaking and other voice applications,

To select an Application Preset:

^

in the Music mode. For music, concerts, and other applications where the

Music is the recommended mode of operation. For hearing assistance

Hearing Assist is the recommended

Voice is the preferred mode of operation.

1) Press the “ ” menu button (Figure 12) to access the LCD

“Application Presets” screen (M1).

2) Press the “+” or “-” menu buttons to select between

Hearing Assist, Music and Voice.

3) When the desired Application Preset is displayed, press the “Set” button to

save the change into memory.

No additional action is necessary. After 30 seconds of inactivity, the LCD screen
will return to the default screen, where the selected Application Preset will be
displayed. NOTE: After an Application Preset has been selected, any of the
configurations can manually be changed if necessary.

PPLICA

A

RF Output = Full Power, Compressor Gain = Normal

Parameters: Hearing Assist Music Voice Hearing Assist Music

Low Pass Filter 8.0 kHz 16 kHz 6.3 kHz 6.3 kHz 6.3 kHz 6.3 kHz
High Pass Filter
Compr

TION

PRESET CONFIGURA

essor Slope

The Application Presets are designed to take the guess work out of common setup procedures.
There will be times when manual adjustments will need to be made (i.e. to select a dif
ing frequency

, bandwidth, to adjust the compression ratio, etc.). For these requirements, please read
through the manual and follow the corresponding menu control instructions. If you are unsure of
how these changes will impact the performance of the T35 transmitter, or how it will affect your
hearing assistance application, please contact Williams Sound for assistance at 800-843-3544.

500 Hz

2.0: 1

TION

TABLE

Wide Band Narrow Band

22 Hz

1.0:1 1.0:1 2.0:1 1.0:1 1.5:1

125 Hz

500 Hz

22 Hz

ferent operat

Voice

125 Hz

-

13

Williams Sound

®

Helping People Hear

BANDWIDTH (M2)

The default LCD menu screen (as shown on page 11, Figure 10) will always display the user selected
bandwidth as “Wideband” or “Narrowband.” The T35 is shipped from the factory in Wideband mode.
First determine the bandwidth of the associated receiver, then set the T35 to that bandwidth:

^

1) Press the “ ” menu button (Figure 12) to access the LCD “Bandwidth” (M2) screen.

2) Press the “+” or “-” menu buttons to select between Narrowband and Wideband.

3) When the desired bandwidth is displayed, press the “Set” button to save the change into memory.

No additional action is necessary. After 30 seconds of inactivity, the LCD screen will return to the default
screen, where the selected bandwidth will be displayed.

FREQUENCY (M3)

First determine the bandwidth and frequency of the associated receiver, then set the T35 to that bandwidth
(see above) and frequency:

vailable Frequencies:

A

1 If the wideband operation is selected, 10 wideband frequencies and 7 non-standard wideband

frequencies are available. Standard Frequencies:

72.100 (CH A), 72.300 (CH B), 72.500 (CH C), 72.700 (CH D), 72.900 (CH E), 74.700 (CH I),

75.300 (CH J), 75.500 (CH F), 75.700 (CH G) and 75.900 MHz (CH H).
Non-standard Frequencies:

72.2 (CH K), 72.4 (CH N), 72.6 (CH 0), 72.8 (CH P), 75.4 (CH R), 75.6 (CH S), 75.8 (CH T).

2

If the narrowband operation is selected, seventy-seven narrowband frequencies are available:

72.025, 72.050, 72.075, 72.100, 72.125, 72.150, 72.175, 72.200, 72.225, 72.250, 72.275, 72.300,

72.325, 72.350, 72.375, 72.400, 72.425, 72.450, 72.475, 72.500, 72.525, 72.550, 72.575, 72.600,

72.625, 72.650, 72.675, 72.700, 72.725, 72.750, 72.775, 72.800, 72.825, 72.850, 72.875, 72.900,

72.925, 72.950, 72.975, 74.625, 74.650, 74.675, 74.700, 74.725, 74.750, 74.775, 75.225, 75.250,

75.275, 75.300, 75.325, 75.350, 75.375, 75.400, 75.425, 75.450, 75.475, 75.500, 75.525, 75.550,

75.575, 75.600, 75.625, 75.650, 75.675, 75.700, 75.725, 75.750, 75.775, 75.800, 75.825, 75.850,

75.875, 75.900, 75.925, 75.950, and 75.975 MHz.
T35 is shipped from the factory with the frequency pre-set to 72.900 MHz.

The

1) Press the “ ” menu button to select the LCD

^

2) To increase the frequency, press the “+” menu button.

To decrease the frequency, press the “-” menu button.

Holding down the “+” or “-” menu buttons will change the frequency automatically until the highest
or lowest available frequency has been met.

3) When the desired frequency is displayed, press the “Set” button to save the change into memory.
No additional action is necessary

inactivity, the LCD screen will return to the default screen, where the selected frequency will be
displayed.

T35 will not broadcast on the newly selected frequency until the “set” button has been pressed.

NOTE:

REMINDER: If the lock icon is displayed on the default display
able to make changes. To unlock the menu screens, refer to the instructions on page 11.

14

The

o change the frequency:

T

“Frequency” (M3)

new adjustment may now be made, or after 30 seconds of

A

.

, the menu screens are locked, and you will not be

screen.

Williams Sound

®

Helping People Hear

AUDIO SOURCE (M4)

The Audio Source control menu is used to configure the T35 for a proper audio source connection. The
transmitter will accept the following audio sources:

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

2)

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.

The Audio Source menu has three possible selections to choose from: MIC, SIMPLEX-MIC, or LINE.
To select the audio input:

^

1) Press the “ ” menu button (Figure 12) to access the LCD “Audio Source” (M4) screen.

2) Press the “+” or “-” menu buttons to select between MIC, SIMPLEX-MIC, or LINE.

3) When the desired audio input is displayed, press the “Set” button to save the change into memory.

No additional action is necessary

. After 30 seconds of inactivity, the LCD screen will return to the default

display.

HIGH PASS FILTER (M5)

The high pass filter will help to remove low frequency “noise” from the transmitted audio signal. This is
typically used when there is room noise, a line hum, or breath accents picked up from an improperly
installed microphone.

To select a High Pass Filter cutoff frequency:

1) Press the down “ ” menu button (Figure 12) to select the LCD “High Pass Filter” (M5) screen.

2) Press the “+” menu button to increase the cutoff frequency.

Each time the “+” button is pressed, the cutoff frequency will be raised by 1/2 octave. This can be
repeated until the cutoff frequency reaches the maximum 700 Hz.

Press the “-” menu button to decrease the cutoff frequency. Each time the “-” button is pressed, the
cutoff frequency will be lowered by 1/2 octave. This can be repeated until the cutoff frequency
reaches the minimum 22 Hz.

3) When the desired cutoff frequency is displayed, press the “Set” button to save the change into

memory.

No additional action is necessary
default display.

^

After 30 seconds of inactivity

.

, the LCD screen will return to the

IMPORTANT: Listen to the transmitted audio through the headphone jack, especially when decid­ing on an appropriate high pass filter. This is a good way to ensure the listening audience is going to

e the highest audio quality

v

ecei

r

.

15

Williams Sound

®

Helping People Hear

LOW PASS FILTER (M6)

The low pass filter will help to remove high frequency “noise” from the transmitted audio signal. This is typ­ically used when there is a hiss is the audio line as a result of room noise, speech sibilants, or other high fre­quency unpleasantries.

To select a Low Pass Filter cutoff frequency:

^

1) Press the down “ ” menu button (Figure 12) to select the LCD “Low Pass Filter” (M6) screen.

2) Press the “+” menu button to increase the cutoff frequency selection.

The cutoff frequency can be increased to a maximum of 16.0 kHz.

Press the “-” menu button to decrease the cutoff frequency selection.
The cutoff frequency can be decreased to a minimum of 3.2 kHz.

3) When the desired cutoff frequency is displayed, press the “Set” button to save the change

into memory.

No additional action is necessary

. After 30 seconds of inactivity, the LCD screen will return to the

default display.

IMPORTANT: Listen to the transmitted audio through the headphone jack, especially when
deciding on an appropriate low pass filter. This is a good way to ensure the listening audi­ence is going to receive the highest audio quality.

COMPRESSOR SLOPE (M7)

Compression is typically used for voice and hearing assistance applications. It reduces the dynamic
range: For a listener who has difficulty hearing the quiet sounds of an audio broadcast, compression
will boost the quiet sounds to louder listening levels. For listening to music programs, concerts, etc.,
lower compression ratios or no compression is generally used.

The Compressor Slope has the following selectable compression ratios:

1.0:1, 1.1:1,

1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.8:1, 2.0:1, 2.2:1, 2.5:1, 3.0:1, 3.5:1, 4.0:1, 4.5:1, 5.0:1, 5.5:1, 6.0:1

NOTE: The T35 is shipped from the factory at a 1.0:1 compression ratio (no compression).

o select a compression ratio:

T

^

1) Press the “ ” menu button (Figure 12) to select the LCD “Compressor Slope” (M7) screen.

2) Press the “+” menu button to increase the steps of compression. The compression ratio can

increase to a maximum of 6:1, which produces generally loud output, even at very low audio level
signals.

.

Press the left “-” menu button to decrease the steps of compression.
lowered to a minimum ratio of 1.0:1, which is no compression.

3) When the desired compression ratio is displayed, press the “Set” button to save the

change into memory. No additional action is necessary.

NOTE: T

he installer of the

T35 needs to tak

impaired people cannot toler

16

The compression can be

e care in using compression, because some hearing

te as loud of a sound as those with normal hearing.

a

Williams Sound

®

Helping People Hear

1.0:1

RATIO

(NO COMPR

ESSION)

3.5:1 RATIO

6.0:1

RATIO (REDU

CED)

1.0:1 RATIO
NORMAL or REDUCED GAIN

3.5:1 RATIO
REDUCED GAIN

3.5:1 RATIO
NORMAL GAIN

COMPRESSION GAIN:

REDUCED ADJUSTMENT

RANGE

AUDIO INPUT LEVEL

(RELATIVE)

LEVEL INDICATOR
REFERENCE:

AUDIO OUTPUT LEVEL IN RECEIVER (RELATIVE)

COMPRESSION GAIN:

NORMAL ADJUSTMENT

RANGE

+20 dB

-40 dB

-30 dB

-20 dB

-10 dB

0 dB

+9+6+30–3–6–9–12–15–18

+10 dB

0 dB-10 dB-20 dB-30 dB

FIG. 13: AUDIO PERFORMANCE USING COMPRESSION

COMPRESSOR GAIN (M8)

The T35 has two selectable modes of compression: Normal and Reduced. For applications such as
music and voice, where the highest audio quality is desirable, Reduced compression is the recommended
mode of operation. Reduced compression minimizes the amount of boost and disturbances in the sound
which compression can cause.

For hearing assistance or applications where the transmitting message is critical for listening, the T35 can be
set to Normal Compression gain. Normal compression boosts the “soft” audio sounds for a more understand­able, consistent delivery. This may be appropriate for applications where the listening audience has moderate
to severe hearing loss. Additional compression can be added (if desirable) by adjusting the Compressor Slope
control. See page 16.
concerts, etc.

NOTE: The T35 is shipped from the factory in the Reduced mode.

Normal compression gain is generally not desirable for applications such as music,

To select Reduced or Normal Compression:

^

1) Press the “ ” menu button (Figure 12) to access the LCD “Compressor Gain” (M8) screen.

2) Press the “+” or “-” menu buttons to select between Reduced and Normal compressor gain.

3) When the desired compressor gain is displayed, press the “Set” button to save the change into memory.

No additional action is necessary. After 30 seconds of inactivity, the LCD screen will return to the
default display.

NOTE: The installer must take care in using compression. Adding too much compression may con-

tribute to excessive noise in the listener’s receivers.

IMPORTANT: Listen to the transmitted audio through the headphone jack, especially when
deciding on an appropriate compressor gain and slope. This is a good way to ensure the lis­tening audience is going to receive the highest audio quality.

17

Williams Sound

®

Helping People Hear

RF OUTPUT (M9)

The T35 has three selectable transmitter power levels: FULL, MEDIUM, LOW POWER, or OFF AIR.
By default the T35 is set to “Full” power mode. For general listening applications, FULL power is the
preferred mode of operation. “Full power” provides the T35 with an operating range of up to 500 ft. For
special listening applications, it may be desirable to reduce the overall operating range on the T35 if:

1) The audio transmission is to be contained to a “smaller” listening area; 2) The signal is too strong
and it is overloading the receiver; or 3) Multiple T35 transmitters are used in adjacent classrooms where
the FM signals overlap each other. In these cases, the power level on the T35 can be reduced to MEDI­UM or LOW. The RF output may be set to OFF AIR (no power) to help troubleshoot interfering or
overlapping RF signals.

To select a power level:

1) Press the “ ” menu button (Figure 12) to access the “RF Output” (M9) screen.

^

2) Press the “+” and “-” menu button to select between: FULL POWER, MEDIUM POWER,

LOW POWER and OFF AIR.

3) When the desired power level is displayed, press the “Set” button to save the change into memory.

No additional action is necessary. After 30 seconds of inactivity, the LCD screen will return to the default
display, where the selected power level will be displayed.

18

Williams Sound

®

Helping People Hear

RECEIVER SAFETY INFORMATION

HEARING SAFETY

CAUTION!

This product is designed to amplify sounds to a high volume level which could poten­tially cause hearing damage if used improperly. To protect your hearing and the

hearing of others:

Make sure the volume is turned down before putting on the earphone or headphone before

1.
adjusting the volume to a comfortable level.

Set the volume level at the minimum setting that you need to hear.

2.

If you experience feedback (a squealing or howling sound), reduce the volume setting and

3.
move the microphone away from the earphone or headphone.

Do not allow children

4.

BATTERY SAFETY AND DISPOSAL

CAUTION!

This product is supplied with disposable Alkaline batteries. Do not attempt to recharge
disposable batteries, which may explode, release dangerous chemicals, cause burns, or
other serious harm to the user or product.

PACEMAKER SAFETY:

CAUTION!

Before using this product with a pacemaker or other medical device, consult your physician

1.
or the manufacturer of your pacemaker or other medical device.

If you have a pacemaker or other medical device, make sure that you are using this

2.
product in accordance with safety guidelines established by your physician or the
pacemaker manufacturer.

RECYCLING INSTRUCTIONS

BATTERY SAFETY AND DISPOSAL

or other unauthorized persons to have access to this product.

illiams Sound protect the environment! Please take the time to dispose of your

W

Help
equipment properly

Product Recycling for Customers in the European Union:

Please do NOT dispose of your Williams Sound equipment in the household trash. Please
take the equipment to a electronics recycling center; OR return the product to the factory for
proper disposal.

y Recycling for

Batter

Please do NOT dispose of used batteries in the household trash. Please take the batteries to a

10/10/05

retail or community collection point for recycling.

.

Customers in the European Union:

19

Williams Sound

®

Helping People Hear

WIDEBAND FM RECEIVERS (OPTIONAL)

On/Off
Vol ume Switch

Earphone
Jack

"On" Indicator
LED

RECEIVER MODEL PPA R35

The PPA R35 is a single-channel receiver operating on the 72-76 MHz bandwidth. It features volume on/off
control, LED power and low battery indicator, and an earphone jack (see Figure 14). Instructions:

FIG. 14

R35 Top

R35 Front

BATTERY INSTALLATION

Install two (2) AA alkaline or NiMH rechargeable batteries. Open the battery compartment by lifting the
tab on the back of the receiver with a finger. To remove depleted batteries, pull up on the fabric strip.
IMPORTANT: If Alkaline (non-rechargeable) batteries are being installed, slide the battery selection
switch above the battery compartment to the “Alkaline” position. If installing NiMH (or rechargeable)
batteries, slide the battery selection switch to the “NiMH” position. Press the batteries into place over
the fabric strip. Be sure to observe proper polarity (+/-). Damage due to improper battery installation
may void the warranty on the product. Close the battery door. When the sound becomes weak or distort­ed, replace or recharge the batteries.

NOTE: The ON indicator will illuminate RED to indicate low battery.

CONNECTING EARPHONES

Plug the earphone into the “EAR” jack on the top of the unit. Only monophonic earphones will operate
properly

. If stereo headphones are used, sound will be heard only in one side.
each earphone and headphone used with the PPA R35 receiver; we can only assure optimum perform­ance when Williams Sound earphones and headphones are used.

OPERATING THE RECEIVER

NOTE: If you’re using the PP

A
input. Also, make sure the T35 is operating in Wideband mode, and transmitting on the same frequency as
the receiver. If the R35 receiver needs to be re-tuned (most Williams Sound receivers are set at the factory
at 72.9 MHz), see page 24 for

Turn the receiver on by rotating the volume control knob clockwise. The receiver’s ON indicator should
illuminate green.
control knob counter

Adjust the volume control for your comfort.

-clockwise until it clicks of

To maximize battery life, remember to turn the receiver off when it’s not in use.

20

T35 transmitter

equency change instructions.

fr

, make sure the transmitter is on and receiving good audio

f. The receiver’s ON indicator should go dark.

W

o turn the receiver of

T

illiams Sound evaluates

f, rotate the volume

Williams Sound

®

Helping People Hear

RECEIVER MODEL PPA R35-8

On/Off Volume
Switch Control

Headphone
Jack

"On"/Low Battery
Indicator LED

Channel
Selector Knob

The PPA R35-8 is an eight channel receiver, operating on 72-76 MHz bandwidth. It features a chan­nel selection knob, volume on/off control, LED power and low battery indicator, and an earphone
jack (See Figure 15). Instructions:

FIG. 15

R35-8 Top

R35-8 Front

BATTERY INSTALLATION

Install two (2) AA alkaline or NiMH rechargeable batteries. Open the battery compartment by
lifting the tab on the back of the receiver with a finger. To remove depleted batteries, pull up on
the fabric strip. IMPORTANT: If Alkaline (non-rechargeable) batteries are being installed, slide
the battery selection switch above the battery compartment to the “Alkaline” position. If
installing NiMH (or rechargeable) batteries, slide the battery selection switch to the “NiMH”
position. Press the batteries into place over the fabric strip. Be sure to observe proper polarity
(+/-). Damage due to improper battery installation may void the warranty on the product. Close
the battery door. When the sound becomes weak or distorted, replace or recharge the batteries.
NOTE:

CONNECTING EARPHONES

The “ON” indicator on top of the unit will flash to indicate low battery

Plug the earphone into the “EAR” jack on the top of the unit. Only monophonic earphones will
operate properly. If stereo headphones are used, sound will be heard only in one side. Williams
Sound evaluates each earphone and headphone used with the PP
assure optimum performance when Williams Sound earphones and headphones are used.

THE

TING

OPERA

Plug the earphone or headphone into the Headphone jack on the receiver’s control panel. Turn the
receiver on by rotating the Volume control knob. The ON indicator should illuminate RED. Select
the channel you’d like by turning the channel selector on the control panel. Choose between 8
standard frequencies:
sure the receiver frequency matches the transmitter frequency! Adjust the volume to a comfortable
listening level.
The ON indicator should not be lit. To prolong the battery life of the unit, turn the receiver off
when it is not in use.

RECEIVER

72.1, 72.3, 72.6. 72.8, 74.7, 75.4, 75.7, or 75.9 MHz. IMPORTANT: Make

o turn the receiver of

T

f, rotate the

.

A R35-8 receiver; we can only

olume control knob to the left until it clicks of

V

f.

21

Williams Sound

®

Helping People Hear

BELT CLIP INSTALLATION FOR PP

– or –

O INSTALL:

T

A R35

AND PP

A R35-8

Position the belt clip on the rear of the R-35 and R35-8 receivers as shown in Figure 16a. Turn the belt clip
180º left or right as shown in Figure 16b. The belt clip is now installed and ready for use.

TO REMOVE:

Turn the belt clip 180º so the edge points toward the top of the unit as shown in figure 16b. Gently pull the
belt clip away from the unit to remove.

FIGURE 16A

FIGURE 16B

EARPAD CLEANING FOR PPA R35 AND PPA R35-8

Do not immerse the earphone in water or other cleaning agent. Foam pads may be removed and washed with
a mild laundry soap solution, rinsed thoroughly, and air dried. You may also opt to purchase new foam pads.

Call Customer Service for ordering information:

1-800-843-3544

22

R7-4 Top

Channel Select

On/Off
Indicator Light

Vo lume Control
On/Off Switch

Earphone/

Charging

Jack

EAR/CHG

Volume

1

Channel

1

2

3

4

R7-4 Fr

ont

Williams Sound

Williams Sound

®

Helping People Hear

ADDITIONAL WIDEBAND RECEIVER OPTIONS

MODEL PPA R7-4

The R7-4 is a four-channel wide-band receiver, pre-tuned to frequencies 72.1, 72.5, 72.9, and

75.7 MHz*. It features a channel select knob, volume control on/off switch, and an
earphone/charging jack. To operate, simply turn the select knob to the desired frequency, and
adjust the volume control to a comfortable listening level.

FIG. 17

*Additional channels are available from 72 - 76 MHz.

23

Williams Sound

®

Helping People Hear

RECEIVER (WIDEBAND) FREQUENCY CHANGE INSTRUCTIONS

IC01

112

12

R30 R- 31 R- 32

1

2
3

4

R7- 4

T

UNING COIL

Ferrite Tuning

"Slug"

Channel Tuning

Alkaline

NiMH

Selecting a frequency for the R31, R32, R-35 and R7-4 receivers requires an adjustment to the internal
tuning coil(s). See Figure 18 for receiver types to locate the coils to be adjusted. A plastic tuning
wrench (PLT 005) will be needed to adjust these receiver tuning coils.

FIG. 18

R-35

Most Williams Sound single channel Receivers are set at the factory to 72.9 MHz. The standard
four-channel receivers (R7-4), channels 1-4, are usually set to frequencies 72.1, 72.5, 72.9, 75.7 MHz
respectively.

The Receiver must be tuned with a weak and somewhat noisy signal. If tuned too close to the
transmitter, with a strong signal, the most accurate tuning of the receiver is not possible.

o Chang

T

e the F

equenc

r

y to Another Channel:

STEP 1: Set the transmitter to the channel desired and remove the antenna.
STEP 2: Connect an audio source to the transmitter such as a CD or cassette player or microphone.
STEP 3: Move the receiver about 25 feet away from the transmitter to set the tuning.
STEP 4: Open the battery compartment, then pull the battery door to the left like a book to open the

back of the receiver.

STEP 5: Locate the Tuning Coil (see Figure 18). Each tuning coil is a small, square, shiny metal can

with a screwdriver slot in a tuning slug in the top center. The Tuning Slug is usually black
or gray.

24

Williams Sound

®

Helping People Hear

STEP 6: W

R19 Top

Channel Switch

Tone Control

Vo lume Control
On/Off Switch

Earphone

Jack

Power

On/Off Indicator

1

R19 Front

EAR Channel

12

Volume

Lo HiMid

2

Off Max

Tone

Narrow Band

Williams Sound

ith the earphone or headphone supplied with the receiver plugged into the Ear Jack, turn the

volume control to a comfortable level, and listen for the transmitted signal.

STEP 7: Gently put the tip of the tuning tool into the slot in the tuning slug. Be careful not to push hard

on the slug so as not to damage the threads in the coil, and do not screw it down more than 3
turns into the coil.

STEP 8: Turn the tuning slug in a counter-clockwise direction about two turns. Then, slowly turn the tuning

slug in the clockwise direction until the signal is heard. There may be two signal points heard.
The one which is received first is a false response. Be sure to continue tuning slightly further
to the correct point, which will be much louder. Tune back and forth to find the center of
the point of best response to the audio source being heard.

STEP 9: Mark down the date, and if a new frequency has been chosen, mark it down inside the receiver

case for future reference.

NARROWBAND FM RECEIVERS (OPTIONAL)

RECEIVER MODEL PPA R19

The R19 is a two-channel narrowband receiver operating on 72.900 and 75.700 MHz frequencies. It
features volume control on/off switch, channel selection switch, earphone jack, tone control selection
switch and on/off power indicator.

NOTE: The R19 and R19-6 narrowband receivers use crystals to designate frequency selection and are
therefore not field tunable. To select a different operating frequency, the receiver must be returned to
Williams Sound for service.

FIG. 19

Y

TTER

BA

Open the battery compartment using a coin in the slot in the bottom of the receiver. Observing proper polarity,
press the AA batteries into place (see “Receiver Battery Information” on page 27). NOTE: Incorrectly

INST

installed batteries may cause damage to your receiver, which will void the five year warranty.

ALLA

TION

25

Williams Sound

®

Helping People Hear

CONNECTING EARPHONES

R19-6 Fr

ont

Williams Sound

Narrow Band

R19-6 Top

Channel Switch

Tone Controls

Vo lume Control
On/Off Switch

Earphone

Jack

Power

On/Off Indicator

Ear

Channel

1

2

3

4

5

6

Volume

Off Max

Lo Mid Hi

Tone

Plug an earphone into the “Ear” jack on the top of the R19 receiver. Only monophonic earphones will
operate properly. If stereo headphones are used, sound will be heard only in one side. A suitable adapter
(Radio Shack Part #274-368) can be used so that stereo earphones operate on both sides

OPERATING THE RECEIVER

.

NOTE: If you’re using the PPA T35 transmitter, make sure the transmitter is on and receiving a good
audio source. Also, make sure the T35 is operating in Narrowband mode, and transmitting on the same
frequency as the receiver (72.900 MHz or 75.700 MHz).

Turn the receiver on by rotating the volume control knob clockwise. A green power LED indicator will
illuminate. If the power indicator does not illuminate, go back and make sure the batteries are properly
installed. If you are using rechargeable batteries, you may need to charge the batteries overnight before
operating the receiver.

Choose an operating frequency by sliding the channel selection switch to position 1 (72.900 MHz) or
position 2 (75.700 MHz).

Turn the volume control knob clockwise until the audio is at a comfortable listening level. Adjust the
tone controls as needed by sliding the tone selection switch to low, mid, or high. When you’re done
using the receiver, be sure to turn off the unit. This will help extend the life of the batteries.

ADDITIONAL NARROWBAND RECEIVER OPTIONS

MODEL PPA R19-6

26

The R19-6 is a six-channel narrowband receiver, pre-tuned to channels 72.1, 72.5, 72.9, 74.7, 75.3, and

75.7 MHz. It features a six-channel select knob, volume control on/off switch, earphone jack, and
power LED indicator. To operate, simply turn the volume control knob clockwise to turn the unit on.
The power LED indicator should illuminate. Turn the channel switch to the desired frequency,and
adjust the volume control knob to a comfortable listening level

FIG. 20

.

Williams Sound

®

Helping People Hear

SUGGESTIONS FOR RECEIVER MANAGEMENT

Different types of facilities use varying approaches to receiver management and earphone sanitation. Below are
some options that customers have used successfully.

Regular users purchase or are given their own receiver and take care of their own batteries and earphones.

1.

2. The facility labels a receiver and earphone for each regular user. The facility maintains the units.

3. Ushers issue receivers to people who request them.
Earphones are sanitized after use. Foam ear cushions can be replaced or washed with a mild detergent,
rinsed thoroughly and air-dried. The EAR 022 Surround Earphone can be sanitized with an alcohol pad.
The receivers can be stored in a multiple compartment storage case with a credit card or driver’s license left
as collateral for the receiver.

4. Regular users purchase their own earphone or headphone and bring them to use with receivers at the facility.

RECEIVER BATTERY INFORMATION (ALL RECEIVER MODELS)

If the receiver sound becomes weak or distorted, replace the battery. The indicator light may remain on, even with a
battery that is weak. Do not leave dead batteries in the receivers. The chart below shows typical battery life with
Williams Sound’s 72-76 MHz receivers:

Model Battery Life Battery Type
R7-4 Alkaline 9V Batteries (BAT 002) 32 hours

Rechargeable 9V NiMH (BAT 003) 6 hours

R19 and R19-6 Alkaline AA Batteries (BAT 001) 90-100 hours

Rechargeable AA NiMH (BAT 026) 45-50 hours

R35 Alkaline AA Batteries (BAT 001) 100 hours

Rechargeable AA NiMH (BAT 026) 56 hours

R35-8 Alkaline AA Batteries (BAT 001) 50 hours

Rechargeable AA NiMH (BAT 026) 32 hours

BATTERY CHARGER INFORMATION

IMPORTANT: Batteries installed in the receiver may only be charged if they are NiMH or Ni-Cad Batteries,
and only if a Williams Sound charger is used. Make sure the receiver is turned off during charging! Use the
chart below to select a charger for your Williams Sound 72-76 MHz receiver.

ger

Model
R7-4 Recharge batteries only with the BAT KT4 or CHG 1269 Multi-Charger unit. For additional

R19 and R19-6 Rechar

R35 and R35-8 Rechar

Char

charging instructions, refer to the manual included with the charger unit.

Dual Charger or the CHG 1600 Multiple

ge batteries only with the CHG 200A
Battery Charger. For additional charging instructions, refer to the manual included with the
charger unit.

ge batteries only with the CHG
instructions, refer to the manual included with the charger unit.

3V

3512 Multi-Char

ger unit. For additional charging

!! IMPORTANT WARNINGS !!

DO NOT A

NOT

DO

These batteries may heat up and explode, causing possible injury and damage to the equipment.
Avoid shorting the plus and minus battery terminals together with metal objects. Battery damage
and burns can r

TTEMPT TO RECHARGE ZINC CARBON (“HEAVY DUTY”), ALKALINE, OR LITHIUM BATTERIES!

RECHARGE DISPOSABLE BATTERIES!

TTEMPT

A

TO

esult! Use only W

illiams Sound supplied chargers and rechargeable batteries!

27

Williams Sound

®

Helping People Hear

TROUBLE SHOOTING

THE T35 “ON AIR” INDICATOR IS NOT ON

þ Make sure the transformer (TFP 016) is plugged into the transmitter and any remote power

switch is on.

þ Make sure the electrical outlet is on.
þ Make sure the power button on the front of the T35 is pressed to the “on” position.
þ Make sure the 24 VAC power supply is working.
þ Make sure the RF output is not set to “OFF AIR.”

NO AUDIO HEARD IN PHONES JACK

þ Check to see if there is a signal coming from your audio source. Check and correct your audio

source if necessary.

þ Check to see if the Headphone Volume Level has been turned all the way down. If so, increase it.
þ Check to see if there is an incorrect or defective connection from your audio source. See page 7 for

detailed connection instructions.

NOISE OR DISTORTION IN THE AUDIO

þ Check to see if there is noise in the audio source. To find out, disconnect the audio cable. If the

noise disappears your noise problem is in the source. Correct or repair your audio source.

þ Perhaps the Audio Source control is not set to match your audio source input device. See page 15 to

properly configure the Audio Source control menu.

þ Check to see if the Audio Input level is set too high. If the “input overload” is illuminated, then the

audio level needs to be adjusted. See page 10.

þ

Check for ground loops or noise on the input signal. See page 9 for more information. Call your
Authorized Williams Sound dealer or representative.

NOISE IN AUDIO “GROWS” WHEN PROGRAM IS SILENT

þ The Audio Level Control may be set too high. You’re probably also seeing the +6 level indicator

lighting all the time. To correct, adjust the Audio Level control on the front of the T35. See page 10.

þ It could be that the T35 Audio Processor is set for Normal Compression, which may be inappropriate

for the type of program being transmitted. Reset the Compressor Gain control to Reduced. See
page 17.

þ It could be that the T35 Compressor Slope ratio is set too high, which may be inappropriate for the

type of program being transmitted. Reset the Compression Slope control to 1.0:1. See page 16.

RECEPTION (AT RECEIVER) DIFFICULTIES

NOTE: Be sure to listen to the audio transmission on the T35 phone jack prior to checking the
receiver reception.

NO RECEPTION

þ Check to see if the antenna on the
þ Check to see if the RF output power on the T35 is set to “OFF.” If so, reset the RF Output control to

T35 has been disconnected. If so, attach the antenna correctly

FULL, MEDIUM or LOW power. See page 18.

28

.

Williams Sound

®

Helping People Hear

þ Make sure the FM receiver is ON. Make sure the batteries are properly installed (observing proper

polarity). If the batteries are rechargeable, it may be necessary to charge the batteries overnight.

þ Make sure the FM receiver is operating on the same frequency as the T35. Make sure the receiver is

operating on the same bandwidth as the T35: Wideband or Narrowband. Follow tuning instruction for
the receiver and adjust accordingly.

INSUFFICIENT RANGE, GOOD RECEPTION NEAR TRANSMITTER, POOR AT A DISTANCE

þ Check to see if the transmitting antenna was installed incorrectly. If so, correct or replace the antenna.

The signal should be clearly audible at a 300 foot distance with the ANT 025 and a 500 foot distance
with the ANT 005.

þ Make sure the transmitting antenna is not in an unsuitable location. Perhaps the transmitting antenna was

installed inside a metal enclosure or is separated from the reception area by electrically conducting
objects. (i.e., steel stud walls, heating ducts, substantial structural steel, or 2x2 or 2x4 ceiling grid.) In
either case, reinstall the antenna according to installation instructions, locating it outside metal enclo
sures and away from electrically conducting objects.

þ Perhaps there is a strong interfering signal. If so, make sure the transmitter and antenna are correctly

installed. Set the transmitter to FULL power output. If this does not solve the problem, try operating the
transmitter on a different frequency. If operating the T35 in wideband mode, try switching to narrow
band operation (see page 14). Narrowband operation is more resistant to outside interference.

USERS MUST TURN RECEIVER VOLUME CONTROLS WAY UP (TO 4 OR 5) TO GET ENOUGH VOLUME

þ Perhaps there is insufficient audio level. If so, the audio level indicator will read too low because the

audio level control is set incorrectly on the transmitter. Correct the Audio Level control setting. See
page 10.

þ It could be that the audio input is not configured for the audio source being used. If not, correct the setting

of the Audio Source control menu. See page 15.

þ Some users may not be helped by this system. Severe hearing loss may require using the system with a

telecoil coupler (i.e., Neckloop) and personal hearing aid.

þ

Check your batteries. For non-rechargeable (alkaline) batteries, they may need replaced. If you are using
rechargeable batteries, make sure the batteries are fully charged prior to use.

USERS COMPLAIN OF TOO MUCH NOISE DURING SOFT AUDIO. DYNAMIC RANGE OF MUSIC REDUCED TOO GREATLY.

þ

Check to see if the Audio Level control is set too high. This problem is more likely to occur in Normal

o reduce this noise, adjust

Compression mode, but can also occur in Reduced Compression mode.

T

the Audio Level, carefully noting the Level Indicator. The +6 LED should light occasionally.

þ

Perhaps the transmitter is set for Normal Compression when Reduced Compression would be more suitable,
given the program material. If so, set the Compressor Gain control to Reduced Compression. See page 17.

29

Williams Sound

®

Helping People Hear

BUZZ IN OTHER EQUIPMENT WHEN TRANSMITTER IS ON OR OFF

þ This is not an RF problem. Instead, it is likely caused by incorrect audio connections, a ground loop, or

defective equipment. To remedy, use proper audio wiring practice to make connections described on page 8.

BUZZ OR OTHER NOISE IN EQUIPMENT ONLY WHEN TRANSMITTER IS ON

þ This is likely an RF–induced disturbance in the other equipment.To remedy, try these steps in

order until the buzz is eliminated:

1. Make certain the transmitter chassis is connected to the equipment cabinet rails.
Buzz/hum in system may be experienced when the T35 chassis is insufficiently grounded. In this
case, install a ground wire to the T35 chassis and terminate to a known good ground source.

2. Make sure antenna connections are secure.

3. Set the T35 Transmitter to MEDIUM power output on the RF Power menu choice.

4 Install transmitter at a distance from sensitive equipment.

5. Use a remote antenna (ANT 005 or ANT 024).

6. Make sensitive equipment more immune to RFI/EMI. The manufacturers of your audio equipment
may offer application notes for this purpose. Williams Sound offers a document giving suggestions
for improving RF immunity in existing audio equipment (

Sound System, FRM 531

).

Technical Bulletin: Buzz Or Hum In The

30

Williams Sound

®

Helping People Hear

LIMITED WARRANTY

Williams Sound products are engineered, designed, and manufactured under carefully controlled conditions
to provide you with many years of reliable service. Williams Sound warrants the Personal PA
against defects in materials and workmanship for FIVE (5) years. During the first five years from the pur­chase date, we will promptly repair or replace the Personal PA

Microphones, earphones, headphones, batteries, chargers, cables, carry cases, and all other accessory products carry a 90-day warranty.

™

Transmitter.

™

Transmitter

WILLIAMS SOUND HAS NO CONTROL OVER THE CONDITIONS UNDER WHICH THIS PROD­UCT IS USED. WILLIAMS SOUND, THEREFORE, DISCLAIMS ALL WARRANTIES NOT SET
FORTH ABOVE, BOTH EXPRESS AND IMPLIED, WITH RESPECT TO THE PERSONAL PA

™

TRANSMITTER, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MER­CHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. WILLIAMS SOUND SHALL NOT BE
LIABLE TO ANY PERSON OR ENTITY FOR ANY MEDICAL EXPENSES OR ANY DIRECT, INCI­DENTAL OR CONSEQUENTIAL DAMAGES CAUSED BY ANY USE, DEFECT, FAILURE OR MAL­FUNCTIONING OF THE PRODUCT, WHETHER A CLAIM FOR SUCH DAMAGES IS BASED UPON
WARRANTY, CONTRACT, TORT OR OTHERWISE, THE SOLE REMEDY FOR ANY DEFECT, FAIL­URE OR MALFUNCTION OF THE PRODUCTS REPLACEMENT OF THE PRODUCT. NO PERSON

ANY AUTHORITY TO BIND WILLIAMS SOUND TO ANY REPRESENTATION OR WARRANTY

HAS
WITH RESPECT TO THE PERSONAL PA

™

TRANSMITTER. UNAUTHORIZED REPAIRS OR MODI-

FICATIONS WILL VOID THE WARRANTY.

The exclusions and limitations set out above are not intended to, and should not be construed so as to con­travene mandatory provisions of applicable law. If any part or term of this Disclaimer of Warranty is held to
be illegal, unenforceable, or in conflict with applicable law by a court of competent jurisdiction, the validity
of the remaining portions of this Disclaimer of Warranty shall not be affected, and all rights and obligations
shall be construed and enforced as if this Limited Warranty did not contain the particular part or term held to
be invalid.

If you experience difficulty with your system, call Toll-Free for customer Assistance:

1-800-843-3544

If it is necessary to return the system for service, your Customer Service Representative will give you a
Return Authorization Number (RA) and shipping instruction.

Pack the system carefully and send it to:

Williams Sound Corp.
Attn:

pair De

Re

pt.
10321 West 70th Street
Eden Prairie, MN 55344 USA

our returned warranty card is our way

our warranty becomes ef

Y

fective the date you purchase your system.

Y
of knowing when your warranty begins. It also gives us important information about your system including
the serial number

. This information will help us serve you better in the future. Please take a moment to com-

plete and mail the attached card. Thank you.

31

Williams Sound

®

Helping People Hear

SYSTEM SPECIFICATIONS

Personal PA T35 Transmitter

Dimensions, Weight: 8.45" (21.5 cm) W x 8.18" (20.8 cm) D x 1.72" (4.4 cm) H, 3.1 lbs. (1.4 kg)
Color: Black with white legends
Rack Mount: One EIA rack space high, 1/2 space wide

1–2 units can be mounted in a single rack space with optional RPK 005 (single) or
RPK 006 (double) Rack Mount Kits

Power: Wall mount Class II transformer (TFP 016)

Input: 120VAC, 60Hz, 17W
Output: 24V
Approvals: UL, CSA listed

FCC ID: CNMT35
Temperature Range: Operating: 0°C to 40°C (+32°F to +104°F)

Storage: -20

Operating Freqs:

72.1–75.9 MHz , 10 wideband channels (selectable), 7 non-standard wideband
channels (selectable) OR

72.025 - 75.975 Mhz, 77 narrowband channels (selectable)
Frequency Accuracy: ±.005% stability, 0-50˚ C
Deviation: Wideband: ± 75 kHz maximum. Narrowband: ± 5kHz maximum
Pre-Emphasis: Wideband: 75 µsec, Narrowband: 300 µsec
RF Field Strength: Does not exceed 8 mV/m at 3 m
Note: Maximum transmitter range is achieved using the ANT 005 coaxial antenna
Nominal Range: 300-500 ft. (90-150 m)
Audio Proc. Functions: Reduced or Normal Compressor Gain

Compression Slope Control

High Pass and Low Pass Filter Frequency control
Frequency Response: 22 – 16000 Hz, +1, -3 dB (adjustable)
Signal to Noise Ratio: 74dB (transmitted)
Audio Level Control: Push-button audio level controls, adjustable to 0 to -50dB
Audio Level Indicators: 10 LED array that reads +9 to -18 at 3dB intervals
Power On Indicator: Green LED indicates power on
Phones Output: Mono signal, 1/4" TRS stereo jack, 67mW, maximum in 50 ohms (adjustable 0 to -40dB)
Audio Input: Combination 3-pin XLR, 1/4" TRS jack
Line Output: RCA jack, -10dBV (.32VRMS) output, impedance 100 Ω
LCD Menu Controls: Applications Presets (Music, Voice, Hearing Assist)
(Push-button selection) Bandwidth, Frequency, Audio Input Source (Microphone, Line, Simplex), High Pass

Filter, Low Pass Filter, Compressor Slope, Compressor Gain, RF Output Power.
Input Levels (Bal or Unbal):
Microphone Simplex-Mic:

Nominal (1st Amber LED) Maximum (Input Overload LED)

-60dBV (1mVRMS) -20dBV (100mVRMS) +20dBV (10.0VRMS)
Line: -8dBV (400mVRMS) +16dBV (6.3VRMS) +20dBV (10.0VRMS)
Simplex Mode: 12 volts simplex power (DIN 45596) on the 3-pin XLR connector
RF “Off” Timer: Turns off RF signal after 1 hour of no audio activity
Common Mode Rejection: Mic or Line > 57dB @ 1kHz
Total Harmonic Distortion: < 0.25% @ -10dBV audio line output, 1kHz
Warranty: Five Years, Parts and Labor

90 days on cords, antenna, power supply and accessories

AC, 500mA with 3-pin Molex® plug

°C to 70°C (-4°F to

+

158

°F)

Absolute Maximum Ratings

1

O CHANGE

SPECIFICA

1

Notes: Stresses above these ratings may cause permanent damage. Exposure for extended periods may degrade reliability

TIONS SUBJECT

T

WITHOUT

32

NOTICE.

.

Williams Sound

®

Helping People Hear

Personal PA Receiver Model R35

Dimensions:

eight: 4.5 oz (127 g)

W
Color: Gray
Battery Type: Two (2) AA non-rechargeable alkaline batteries (BAT 001), approx. 100 hrs. battery life; or

Current Consumption: Nominal 40 mA
FCC ID: CNM R35
Industry Canada Cert.:
Operating Freq.: Pre-tuned, adjustable, 72 MHz-76 MHz *
Intermediate Freq.: 75 kHz

Deviation: 75 kHz

FM
De-Emphasis: 75 µS
AFC Range: ± 120 kHz
Sensitivity: 2 µV at 12 dB Sinad with squelch defeated
Input Overload: 20 mV
Frequency Response: 100 – 15 kHz, ± 3 dB
Signal-to-Noise Ratio:
Receive Antenna: Integral with earphone/headphone cord
Audio Output: 35 mW, max. at 16 Ω
Output Connector: 3.5 mm mono phone jack
Earphone: Earbud-type with foam cushion, 3.5 mm plug, 32 Ω
Notes: The R35 Receiver can be field tuned to any of 10 wideband

Warranty: Five years, parts and labor. 90 days on cords, earphones,

4.1" L x 2.85" W x 1.2" H (104.1 mm x 72.4 mm x 30.4 mm)

wo (2) AA rechargeable NiMH batteries (BAT 026), 1400 mAh, approx. 56 hrs. battery life

T

1360A-R35

65 dB at 10 µV

channels using the PLT 005 Tuning Tool.

headphones, batteries and other accessories

Personal PA Receiver Model R35-8

Dimensions:
Weight: 4.6 oz (130 g)
Color: Gray
Battery Type:

Current Consumption: Nominal 40 mA
FCC ID: Self Declared. Not Applicable
Industry Canada: 1360A-R358
Operating Freq: 8 channels: 72.1, 72.3, 72.6, 72.8, 74.7, 75.4, 75.7, or 75.9 MHz.

Intermediate Freq:
FM Deviation: +/- 75 kHz
De-emphasis: 75 uS
LED Indicator:
Sensitivity: 2 uV at 12 dB SINAD with squelch defeated
Input Overload: 20 mV
Frequency Response:
Signal to Noise ratio: 60 dB at 100 uV
Receive Antenna: Integral with earphone/headphone cord
Audio Output:
Output Connector: 3.5 mm mono phone jack
Squelch:

Notes:

Warranty:

4.5” H x 2.85 W x 1.2” D (115 mm x 72 mm x 30 mm)

Two (2) AA non-rechargeable alkaline batteries (BAT 001), approx. 50 hrs. battery life; or
Two (2) AA rechargeable NiMH batteries (BAT 026), 1400 mAh, approx. 32 hrs. battery life

All channels not available on the PPA T20 Transmitter

10.7 MHz

Power: Red. Low Battery: Flashes

40 Hz to 15 kHz +/- 3 dB

, max 16 ohm load

35 mW

Located inside battery door

. Factory set for 25 dB S/N. Squelch
may be set with JFD-7104-5 from Sprague Goodman or any flat tipped
tuning tool with tip size .095 X .016
The R35-8 is NOT

field tunable.

carefully selected to inhibit inter

The eight channels have been

-modulation interference. Channel

frequencies are 72.1, 72.3, 72.6, 72.8, 74.7, 75.4, 75.7, and 75.9 MHz.

ears, Parts and Labor

Y

Five

. 90 days on cords, earphones, headphones, batteries, and

other accessories

Note: *FCC rules limit the use of the 72–76 MHz band to hearing assistance for the handicapped only.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

33

Williams Sound

®

Helping People Hear

Personal PA R7-4 Wideband Receiver

Dimensions:
Weight:

Color: Gray
Battery Type: 9 Volt, Eveready 216 Carbon, Eveready 522 Alkaline, or BAT 003 Ni-Cad Rechargeable

Battery Drain: 14 mA, nominal
Battery Life: 32 hours with Eveready 522, 6 hours/charge with BAT 003
FCC ID: CNM R7Y, CNM R74Y
Operating Freq.: 4-Channel, Pre-Tuned, Selectable

Intermediate Freq.: 75 kHz
FM Deviation: 75 kHz
De-Emphasis: 75 µS
AFC Range: ± 300 kHz
Sensitivity: 2 µ V at 12 dB Sinad with squelch defeated
Input Overload:
Squelch: Squelches at 10 µV for minimum

Frequency Response: 100–10 kHz, ± 3 dB
Signal-to-Noise Ratio: 65 dB at strong signal condition
Receive Antenna: Integral with earphone/headphone cord
Audio Output: 250 mW, max. at 16 Ohms
Output Connector: 3.5 mm mini phone jack, also serves as a charging jack for rechargeable battery
Earphone: Earbud-type with foam cushion, 3.5 mm plug, 32 Ω (Other styles available)
Channel Selector: 4–position, rotary switch
Warranty: Five Years, Parts and Labor.

3-5/8" L x 2-3/8" W x 7/8" H (92.1 mm x 60.3 mm x 22.2 mm)

3.2 oz (90 g) with battery

CH A (72.1 MHz), CH C (72.5 MHz), CH E (72.9 MHz), CH G (75.7 MHz)

(OR)

CH B (72.3 MHz), CH D (72.7 MHz), CH F (75.5 MHz), CH H (75.9 MHz)

20 mV

50 dB S/N ratio

90 days on cords, earphones, headphones, batteries and other accessories

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

34

Williams Sound

®

Helping People Hear

Personal PA Receiver Models R19 and R19-6

Model PP

Model PPA R19–6: 6-Channel, Pre-Tuned, Selectable

Dimensions: 3-5/8" L x 2-3/8" W x 7/8" H

Weight: 3.2 oz (90 g) with battery
Color: Neptune Blue
Battery Type: (2) BAT 001 AA Alkaline

Battery Drain: 20 mA, nominal
Battery Life: 90–100 hrs with 2 AA Alkaline

Operating Freq: Crystal controlled. See factory for frequency changing instructions.
Intermediate Freqs: 10.7 MHz, 455 kHz
FCC ID: CNMR19
Earphone: Earbud-type with foam cushion, 3.5 mm plug, 32 Ω
Output Connector: 3.5 mm mini phone jack
FM Deviation: Narrow–band, 5 kHz
De-Emphasis: 300 µS
Sensitivity: 0.7 µV at 12 dB Sinad
Squelch Level: 4 µV for minimum 40 dB S/N ratio
Frequency Response: 100 – 5 kHz, ± 3 dB (Tone: Lo)
Receiver Antenna: Integral with earphone cord
Signal-to-Noise Ratio: 50dB
Audio Output: 125 mW, max. at 32 Ω (Tone: Lo; 3 VDC Bat.)
Acoustic Output: 125 dB Max SSPL90 with EAR 013

A R19: 2-Channel, Pre-Tuned, Selectable

CH 36 (72.9 MHz), CH 66 (75.7 MHz) standard
10 Channels Available (72.1-75.9 MHz)

CH 4 (72.1 MHz), CH 20 (72.5 MHz),
CH 36 (72.9 MHz), CH 66 (75.7 MHz)
CH 43 (74.7 MHz), CH 50 (75.3 MHz)

(92.1 mm x 60.3 mm x 22.2 mm)

or (2) BAT 026 NiMH

45-50 hrs/char

ge with BAT 026

CONTROLS

Tone: Switched Low-Cut

Lo: 20 Hz / Mid: 120 Hz / Hi: 700 Hz
Volume & On/Off: Combination, integral
Channel Selector: PPA R19: 2-position, slide switch

PPA R19-6: 6-position, rotary switch
Warranty: Five Years, Parts and Labor.

90 days on cords, earphones, headphones, batteries and other accessories

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

35

Williams Sound Corp.

10321 West 70th St., Eden Prairie, MN 55344

U.S.A. 800-843-3544 / 952-943-2252 / FAX: [phone]

MAN 110G ©2005 W

illiams Sound Corp.