Williams Sound PERSONAL PA T35 Guide

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

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3
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

4
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
+
–
+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
WilliamsSound
WilliamsSound
FIGURE 1: OVERALL SYSTEM DIAGRAM
*Range may be affected by metal structures. 500+ feet is the maximum operating range of the T35
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5
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
ir
+
–
+9
+6
+3
0
-3
-6
-9
-12
-15
-18
QUICK SETUP INSTRUCTIONS

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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.

I 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)

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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.
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.
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

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In Phase
Balanced Line Usin
g
1/4' Connector
Unbalanced Line Usin
g
1/4" Connecto
r
4.7 K
4.7 K
Source A
Source B
Connecting to a Multi-Channel or
Stereo Source
In Phase
From Microphone
12
3
3 Pin Connector
Low Impedance Microphone
In Phase
3 Pin Connector
12
3
Balanced Line Usin
g
3–Pin Connecto
r
3 Pin Connector
12
3
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.

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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
12
3
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
e
PPA T35

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10
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
+
–
+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
FIGURE 9: PPA T35 FRONT VIEW
CONTROLS &F
EATURES

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11
PHONES JACK AND SOURCE BUTTON
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 “TRANS-
MITTED” 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 but-
tons 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 contin-
uously 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 illumi-
nate 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,
Bandwidth, 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 accidently changed (except for the direct
access functions). To lock or unlock the 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.
Operating Frequency
Audio Input Level
Menu Screen Number
Transmitting Power
Menu Lock Icon
FIGURE 10: Default Display Menu
Application Preset

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LCD SCREEN MENUS (QUICK REFERENCE)
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.
Digital Frequency Synthesized
Power
Power
Phones
Phones
Source
Source
Volu m e
Volume
Audio
Audio
Level
Level
Input
Input
Overload
Overload
On Air
On Air
+
–
+9
+9
+6
+6
+3
+3
0
-3
-3
-6
-6
-9
-9
-12
-12
-15
-15
-18
-18
-
+
PPA T35
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
FIGURE 11: SELECTING AN LCD MENU
^

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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 con-
figuring 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 in the Music mode. For music, concerts, and other applications where
the highest audio quality is desirable, Music is the recommended mode of operation. For hearing
assistance applications, or applications where the message is critical for listening, Hearing Assist is
the recommended mode of operation. For speaking and other voice applications, Voice is the pre-
ferred mode of operation.
To select an Application Preset:
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” but-
ton 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 sel-
ected, any of the configurations can manually be changed if necessary.
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 different operat-
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.
Parameters: Hearing Assist Music Voice Hearing Assist Music Voice
Low Pass Filter 8.0 kHz 16 kHz 6.3 kHz 6.3 kHz 6.3 kHz 6.3 kHz
High Pass Filter 500 Hz 22 Hz 125 Hz 500 Hz 22 Hz 125 Hz
Compressor Slope 2.0: 1 1.0:1 1.0:1 2.0:1 1.0:1 1.5:1
Set
^
^
-
+
LCD Menu Controls
FIGURE 12:
Front panel of the T35
^
Wide Band Narrow Band
Application Preset Configuration Table
RF Output = Full Power, Compressor Gain = Normal
LCD SCREEN MENUS (DETAILED)

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14
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:
Available Frequencies:
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).
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.
The T35 is shipped from the factory with the frequency pre-set to 72.900 MHz. To change the frequency:
1) Press the “ “ menu button to select the LCD “Frequency” (M3) screen.
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. A new adjustment may now be made, or after 30 seconds of
inactivity, the LCD screen will return to the default screen, where the selected frequency will be
displayed.
NOTE: The T35 will not broadcast on the newly selected frequency until the “set” button has been pressed.
REMINDER: If the lock icon is displayed on the default display, the menu screens are locked, and
you will not be able to make changes. To unlock the menu screens, refer to the instructions on page 11.
^
^
1.
2.

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15
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 improp-
erly 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. 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 high pass filter. This is a good way to ensure the listening
audience is going to receive the highest audio quality.

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16
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.
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 broad-
cast, compression will boost the quiet sounds to louder listening levels. For listening to music pro-
grams, 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).
To select a compression ratio:
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. The compression
can be 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: The installer of the T35 needs to take care in using compression, because some hearing
impaired people cannot tolerate as loud of a sound as those with normal hearing.
^
^
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 audi-
ence is going to receive the highest audio quality.

Williams Sound ®
Helping People Hear
17
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 listen-
ing audience has moderate to severe hearing loss. Additional compression can be added (if desire-
able) by adjusting the Compressor Slope control. See page 16.
Normal compression gain is gener-
ally not desirable for applications such as music, concerts, etc.
NOTE: The T35 is shipped from the factory in the Reduced mode.
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.
1.0:1 RATIO (NO COMPRESSION)
3.5:1 RATIO
6.0:1 RATIO (REDUCED)
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:
NORMALADJUSTMENT
RANGE
+20 dB
-40 dB
-30 dB
-20 dB
-10 dB
0 dB
+9+6+30–3–6–9–12–15–18
+10 dB0 dB-10 dB-20 dB-30 dB
FIGURE 13: AUDIO PERFORMANCE USING COMPRESSION
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.
^

Williams Sound ®
Helping People Hear
18
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 intefering 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.
^

Williams Sound ®
Helping People Hear
19
WIDEBAND FM RECEIVERS (OPTIONAL)
RECEIVER MODEL PPA R30
The R30 is a single-channel wideband receiver pre-tuned to 72.9 MHz (additional wide-
band frequencies are available from 72 MHz-76 MHz). It features a single volume con-
trol on/off switch, LED on indicator, and earphone jack. Instructions:
BATTERY INSTALLATION
Open the battery compartment using a coin in the slot in the bottom of the receiver.
Press the AA batteries into place (see “Receiver Battery Information” on page 24),
observing proper battery polarity. Incorrect insertion of the batteries is difficult, and
may cause both mechanical and electrical damage to the receiver not covered by
the 5 year warranty. The receiver will not work with the batteries incorrectly installed.
CONNECTING EARPHONES
Plug an earphone into the jack near the thumb wheel volume control. Only mono-
phonic 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. Williams Sound extensively evaluates the
earphones and headphones included with the PPA R30. We can only assure optimum
performance when Williams Sound earphones and headphones are used.
OPERATING THE RECEIVER
NOTE: If you’re using the PPA T35 transmitter, make sure the transmitter is on and receiv-
ing a good audio input. Also, make sure the T35 is operating in Wideband mode, and
transmitting on the same frequency as the receiver.
Turn the receiver on by rotating the volume control dial in the direction of the arrow on
top of the case. The “On” indicator will illuminate.
Turning the dial in the direction of the arrow will increase the volume. Turning the dial
against the arrow will decrease the volume. To avoid depleting the batteries, make
sure the receiver is turned off when not in use.
R30 Front
R30 Top
EAR Volume
1
Volume Control
On/Off Switch
Earphone/Headphone
Jack
"On" Indicator
LED
Williams Sound
FIG. 14

Williams Sound ®
Helping People Hear
20
If you’re using the PPA T35 with a microphone—and not a complete sound system—
have someone speak into the microphone while you listen with the receiver and ear-
phone. You should be able to hear their voice through the receiver.
Note: The earphone cord is the receiving antenna. Do not bunch up the cord or wrap
it around the receiver while in use.
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.
R7-4 Top
Channel Select
On/Off
Indicator Light
Volume Control
On/Off Switch
Earphone/
Charging
Jack
EAR/CHG Volume
1
Channel
1234
R7-4 Front
Williams Sound
FIG. 15
*Additional channels are available from 72 - 76 MHz.