Williams Sound PERSONAL PA T35 Guide

PERSONAL PA®T35 Transmitter
Wireless FM Listening System
Manual and User Guide
Transmitter Model PPA T35
Optional Receiver Models PPA R37, PPA R35-8
MAN 160D

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PERSONAL PA®T35 Transmitter
MAN 160D

3
PERSONAL PA®T35 Transmitter
MAN 160D
PERSONAL PA®T35 Transmitter
Manual and User Guide
Contents
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
Safety Information ........................................................................................................................................................... 19
Recycling Instructions .................................................................................................................................................... 19
Receiver Instructions ...................................................................................................................................................... 20
Receiver Management ................................................................................................................................................... 23
Battery Information......................................................................................................................................................... 23
Trouble-Shooting Guide.................................................................................................................................................. 24
Warranty............................................................................................................................................................................. 27
System Specications .................................................................................................................................................... 28

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PERSONAL PA®T35 Transmitter
MAN 160D
LOUDSPEAKER
LINE-LEVEL
OUTPUT
SOUND SYSTEM
AMPLIFIER
MICROPHONE
PPA T35 TRANSMITTER FM RECEIVERS
A100
System Overview
The PPA T35 is an FM Wide-Band / Narrow-Band transmitter operating in the 72-76MHz bandwidth. Compatible Williams
Sound receivers include PPA R37, PPA R35-8 and the PPA R1600 remote speaker.
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 just like an FM radio station. The transmitter takes audio directly from a microphone or sound
system. This audio is then broadcast over an FM radio signal. FM radios can be worn by listeners or AC powered amplied
speaker with built in radio can be utilized as needed. The broadcast can be received up to 1000ft from the transmitter *. This
allows listeners to sit anywhere in the area and listen to the broadcast at the level they need without disturbing others around
them.
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
modications made by the user not expressly approved for compliance may result in the loss of all privileges and
authority to operate the equipment.
*Range is dependant upon the environment.
Figure 1: Overall System Diagram

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PERSONAL PA®T35 Transmitter
MAN 160D
Quick Setup Instructions
1. Position the PPA T35 transmitter near the sound system or mixer from which it will receive audio.
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.
The antenna length must NOT exceed 28 inches when fully extended. It was found during test that the antenna length, when
the length was greater than 28 inches, the device failed the radiated emissions. It FAILED with the longer length.
3. Connect the power supply to the “Power In” connector (gure 5, page 7) 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.
4. Select an application. The T35 has three pre-congured Application 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 “ v ” 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.
5. Congure the T35 for the appropriate audio source. Using the menu control buttons on the front of the T35 (Figure 2), press the
“ v ” 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.
6. 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 2.
7. 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.
8. Listen with an FM receiver (see pages 20-21 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. To change receiver channels, see pages 20-21.
Please read through this manual carefully for detailed instructions and setup procedures.
Figure 2: LCD Menu and Audio Input Controls
AUDIO INPUT
CONTROLS
LCD MENU
CONTROL BUTTONS
–
+
V
–
–
+
+
V
Set
A101

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PERSONAL PA®T35 Transmitter
MAN 160D
Remote Antenna:
FCC rules allow only the use of antennas provided by Williams Sound. To use a remote antenna supplied by Williams Sound, the
antenna cap may be removed by turning it counter-clockwise with a pliers or wrench. Please call customer service 800.843.3544
if you have any questions.
The external antenna impedance is 75 Ohms.
Setting up the PPA T35 - Detailed Instructions
Select a Location
The transmitter is usually located near the sound system amplier 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.
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 3). Do not use excessive force
to tighten the antenna. The antenna length must NOT exceed 28 inches when fully extended. It was found during test that the
antenna length, when the length was greater than 28 inches, the device failed the radiated emissions. It FAILED with the longer
length.
ANT 025 ANTENNA
(INCLUDED)
ANT 005
COAXIAL ANTENNA
OR
ANT 024 WALL MOUNT
DIPOLE ANTENNA
(OPTIONAL)
A102
Figure 3: Installing the ANT 025 Antenna (rear view)

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PERSONAL PA®T35 Transmitter
MAN 160D
NOTE: 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.
WARNING:
The T35 is not designed to accept 70 volt speaker signals! This may result in damage to your system. The
sound source should come directly from the system mixer or amplier as an unprocessed signal.
IMPORTANT: When a suitable audio source has been selected, you MUST congure 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.
POWER
SUPPLY
A103
Figure 4: Rear View of T35
Wiring and Connections
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.

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PERSONAL PA®T35 Transmitter
MAN 160D
BALANCED LINE USING 1/4" CONNECTOR
IN PHASE
A106
UNBALANCED LINE USING 1/4" CONNECTOR
A107
4.7 K
4.7 K
SOURCE A
SOURCE B
CONNECTING TO A MULTI-CHANNEL OR STEREO SOURCE
A109
BALANCED LINE USING 3–PIN CONNECTOR
IN PHASE
1 2
3
3 PIN CONNECTOR
A108
IN PHASE
FROM MICROPHONE
1 2
3
3 PIN CONNECTOR
LOW IMPEDANCE MICROPHONE
A104 UNBALANCED LINE USING 3–PIN CONNECTOR
1 2
3
3 PIN CONNECTOR
A105
Figure 5: 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 5.
Selecting an Audio source Appropriate for Hearing Impaired Listeners
If the T35 is going to be used specically for the accommodation of hearing impaired listeners, we recommend following these
general guidelines:
The PPA T35 transmits audio with excellent delity. 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.
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
milliseconds after audio from the main sound reinforcement system speaker is helpful. This will also help audience members who
lip read.

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PERSONAL PA®T35 Transmitter
MAN 160D
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 usually requires some experimentation. See Figure 6.
IN PHASE
1 2
3
3-PIN
CONNECTOR
BREAKING A GROUND LOOP WHEN
CONNECTING TO A UNBALANCED LINE
BREAKING A GROUND LOOP WHEN
CONNECTING TO A BALANCED LINE
.01 uF CERAMIC DISC
CAPACITOR .01 uF CERAMIC
DISC CAPACITOR
A110
Figure 6: Connecting to a Balance/Unbalanced Line
Figure 7: Audio Line Output
PPA T35 RECORDING DEVICE
AUDIO LINE OUT AUDIO LINE IN
A111
Connecting the T35 to a Recording Device
Use the Audio Line Out jack for monitoring, recording, or routing processed audio to another sound system.

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PERSONAL PA®T35 Transmitter
MAN 160D
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.)
NOTE: Direct Access Buttons (Figure 8) allow the user to change congurations on the transmitter 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
BUTTON
DIRECT ACCESS
BUTTONS
DIRECT ACCESS
BUTTONS
LCD MENU
DISPLAY
MENU CONTROL
BUTTONS
–
+
V
–
–
+
+
V
Set
A112
Figure 8: PPA T35 Front View
Controls & Features