Williams Sound PPA 300 Troubleshooting guide

Installation
Guide &
User
Manual
PERSONAL PA Deluxe System 300
Wireless FM Listening System
Transmitter Model T20
Williams Sound ®
Receiver Models R7, R7–4
Helping People Hear

PERSONAL PA Deluxe System 300
Installation Guide & User Manual
Contents Page
Overview 4
Set-Up and Operation
T20 Transmitter
Antenna Connection
Power Connection
Audio Connection
Using a Microphone
Audio Processor Options
4
R7 / R7-4 Receivers
Using R7, R7–4 Receivers
Additional Receiver Instructions
Controls and Features 5
Battery Information 10
Suggestions For Receiver Management 11
Using a Remote Antenna 11
Troubleshooting Guide 12
Radio Interference / Tuning Instructions 14
Warranty 14
System Specifications 15
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Overview Set-Up & Operation
Thank you for purchasing the Personal PA Deluxe
System 300 from Williams Sound Corporation. T20 Transmitter
Step 1: Install the antenna.
The PPA 300 is a Wide-band FM Listening System
which operates in the 72–76 MHz frequency band.
Designed for hearing assistance in places of public
access, the PPA 300 is for those who need help
overcoming background noise, reverberation, or
distance from the sound source. It’s easily integrated
with your existing sound system or can be used with
a microphone as a stand-alone system.
Your PPA 300 has two principal parts: the T20
Transmitter and the R7 or R7-4 Receivers. Much like
a miniature radio station, the transmitter and
microphone pick up the sounds you want to hear and
broadcast them over an FM radio signal. The
receivers pick up the broadcast up to 500 feet away.
To avoid difficulties, read through this manual as
you begin to use the system. Then save it for
questions that arise as you continue to use your PPA
system.
If you have any problems with this Williams Sound
product, don’t hesitate to call us toll-free at
1-800-843-3544.
The “rubber duck” whip antenna fits into
the hole on top of the transmitter and
threads onto a mounting stud inside.
Guide the antenna onto the stud and turn it
clockwise to tighten. Do not use excessive
force to tighten the antenna. It only needs
to be finger-tight.
If the optional remote antenna (ANT 005)
is more appropriate, contact your dealer or
Williams Sound Corp. The remote antenna
installation is detailed on page 11.
Step 2: Connect the Transmitter to Power.
The T20 is supplied with a wall
transformer power supply (TFP 016). Plug
the power cord into the “Power” connector
on the rear panel of the T20. Then plug the
transformer into a 120 V, 60 Hz wall
outlet. The indicator light on the front
panel of the T20 should glow when the
power is connected.
There is no ON/OFF switch. Due to low
energy consumption, the T20 is
designed to run continuously.
Sound System Amplifier
Loudspeakers
Microphones
Line-Level Output
R7 / R7-4 Receivers
w/Earphones
Line-Level Input
T20 Transmitter
Tape Out/Phones
Audio Level
HiOk
Power
FM Auditory AssistanceTransmitter
Adjust
Williams Sound
+-
WB NBOn
Transmit Status
Figure 1: Overall System Diagram
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Figure 2: T20 Transmitter Controls & Features
Audio Indicators: Tape Out/Phones:
Amber LED "Ok" for nominal input signal level 1/4” jack, 600 mV, 100 Ωsource impedance. Also drives
Red LED "Hi" for excessive input signal level mono or stereo headphone. Monitors exactly what is being
Tape Out/Phones
Audio Level
HiOk
Power
FM Auditory AssistanceTransmitter
Adjust
Williams Sound
+-
WB NBOn
Transmit Status
transmitted.
Power Indicator:
Green LED RF Indicators: Green LED "On" indicates transmitter RF is on
Amber LED "WB" indicates wide–band channel is selected
Amber LED "NB" indicates narrow–band channel is selected
Audio Level Control:
Rotary pot, screwdriver adjust,
used with audio indicator lights
Balanced Audio Input
Line
Mic 70V
FM Auditory AssistanceTransmitter
Select
Unbalanced
Audio Inputs
20 Hz
175 Hz
725 Hz
Hi-Pass Filter
Antenna
Power: 24 VAC, 60 Hz, 10VA
RF Power
75 Ohm
Made in USA Williams Sound Corp.
Channel
COM IN 1 IN 2 IN 3
-12dB Max-6dB
1st
Digit
2nd
Digit
Use with TFP 016
Power Supply
Audio Inputs:
All inputs are actively mixed into a single
signal, allowing use of mono, stereo,
3 channel or 4 channel audio sources
Balanced Audio Input:
Combination 3-pin female
XLR/1/4" stereo jack, accepts
balanced or unbalanced microphone
and line level inputs, 25 V or 70 V
audio input
Input Selector Switch:
3-position slide-type, selects: mic/line/70 V
on combination XLR/Phone audio input
jack
Unbal. Audio Inputs:
Four screw terminals, three unbalanced
line-level inputs,
one ground, actively mixed
High-Pass Filter Switch:
3-position slide-type,
20 Hz, 175 Hz, or 725 Hz,
6 dB / octave roll-off
RF Output Switch:
3-position slide-type,
Full power, -6 dB, -12 dB
Remote Antenna Output:
F-type connector for 75 ΩCoaxial
Antenna (ANT 005) uses RG-59 cable.
Power
Connection:
3-pin, Molex
connector for TFP
016 power supply
Channel Selector:
2 rotary switches set the operating
frequency
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The wall transformer can be plugged into
a switched outlet that turns on when the
other sound equipment is turned on. If
turning the T20 on creates a hum or buzz
in the sound system, see the
Troubleshooting Guide on page 12.
Step 3: Make audio connections.
Step 3a: (If you will be using the T20 with an
existing sound system)
Refer to the Overall System Diagram, on
page 4. The T20 has been designed to
accept virtually any type of audio input,
with up to four different input signals
actively mixed together. The best sources
for audio signal from sound system are as
follows:
1st Choice: TAPE OUT or LINE OUT
2nd Choice: BOOSTER or BRIDGING
3rd Choice: Speaker Terminal, or
Speaker Transformer tap
Input connection options for the T20
transmitter are as follows:
Balanced Audio Input Concentric Jack:
1. Accepts balanced and unbalanced
XLR or TRS 1/4" Mic-Level or
Line-Level Inputs
2. Accepts balanced and unbalanced
Mic-Level or Line-Level Inputs
3. Accepts balanced and unbalanced
Speaker-Level Inputs
(25V, 70V speaker line)
See Figure 4 for connection details.
Use the audio cable and adaptor supplied
to connect the T20 “Audio In” jack to an
appropriate audio output jack on the sound
system mixer or amplifier. (See Figure 3.)
If your amplifier or mixer does not have
RCA-type connectors, you can obtain
adaptors from your Authorized Williams
Sound Dealer or a local radio parts store.
If the TAPE OUT jack is already in use, a
Y-Cord can be used to connect the T20
and a second device to the same jack.
Unbalanced Audio Input Terminals:
Accepts one to three unbalanced line-level
signals, which are actively mixed. The
three inputs share a common ground
connection.
Step 3b: (If you will be using the T20 with a
microphone as a stand-alone system)
Any professional low-impedance
microphone may be used with the T20.
Plug the microphone into the concentric
jack (“Balanced Audio Input”) on the rear
panel of the T20. The T20 supplies
positive DC voltage to power condenser
microphones per DIN45596. (Standard
dynamic microphones may also be used.)
Make sure the input selector switch is in
the MIC position. Talking into the
microphone should cause the audio
indicator light to flash on the front panel.
If you use both the Microphone input and
the Audio Input on the T20, the signals
will be mixed.
Step 4: Set the Input Selector Switch.
If you are using the combination
XLR/phone plug input jack, make sure the
selector switch is set in the proper position
as shown in Figure 4.
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RCA to 1/4" Adapter
To T20 Concentric Jack
RCA to RCA Cable
From Sound System Line Output
Figure 3: Using The Audio Cable Supplied With The System

Dynamic Low
Impedance Mic
Simplex Powered
Condenser Mic
2 1
3
2 1
3
Male XLR Connector
To T20 Input LINE
MIC 70 V
Unbalanced
Dynamic Mic
Battery Powered
Condenser Mic
1/4in. 2-Conductor
Phone plug to T20 Input
LINE
MIC 70 V
Balanced Line 2 1
3
Male XLR Connector
To T20 Input LINE
MIC 70 V
Shield Grounded As Required
Shield Grounded As Required
Shield Grounded To Amplifier
Shield Grounded To Amplifier
4, 8, 0r 16 Ohm
Speaker Line
2 1
3
Male XLR Connector
To T20 Input LINE
MIC 70 V
25 or 70 Volt
Speaker Line
2 1
3
Male XLR Connector
To T20 Input LINE
MIC 70 V
Balanced
Line
LINE
MIC 70 V
LINE
MIC 70 V
1/4in. 2-Conductor
Phone plug to T20 Input
1/4in. 2-Conductor
Phone plug to T20 Input
Unbalanced
Line
Figure 4: Audio Connection Wiring Detail
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0
–10
0
Hard Limiter (Always Functional)
Compress
–10
–20
–20
–30
–30
–40
–40
+10
+10 +20
Hard Limit
Noise Reduction
Soft Limit
Audio "OK" Light ON Audio "High" Light ON
RELATIVE INPUT LEVEL
RELATIVE OUTPUT LEVEL
Figure 5: T20 Audio Processor Performance
Step 5: Set the Hi-Pass Filter Switch.
The High-Pass Filter switch is used to
reduce low frequencies. It is normally
used in the middle (175 Hz) position to
provide high frequency emphasis that
improves speech understanding for hard of
hearing listeners. If the program content is
primarily musical, it can be used in the left
(20 Hz) position. The right position
(725 Hz) may be used for further low
frequency reduction, or it may be used to
reduce low frequency system noise due to
pick up of ventilation system noise, etc.
Step 6: Set the RF Power Switch.
In some situations, the radio signal
produced by the transmitter can enter
other types of equipment and create a hum
or buzzing sound in the sound system.
This is due to poor RF protection in the
other equipment, NOT a problem with the
transmitter.
The normal switch position is MAX power
(right).
If you encounter a hum or buzz in the
sound system when the T20 is turned on,
move the switch to the -6 dB (middle
position). If the buzz diminishes, but
persists, move the switch to the -12 dB
(left) position. If this does not solve the
problem, refer to the Troubleshooting
Guide on page 12.
However, if the amount of buzz does not
change when the RF power switch is
moved from MAX to -12 dB, the buzz is
not related to RF interference from the
T20.
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The system range is decreased when
power is reduced, but usually still covers
the entire seating area.
Step 7: Use a receiver to test the system and set
the input level control.
Audio Processor Options
The audio processor in the T20 is capable of four
modes of operation. The effects of these modes are
charted in figure 5.
Compressor Mode
Compressor mode is used for hearing assistance to
limit the dynamic range of the audio signals.
Hearing impaired people generally have a reduced
tolerance for wide dynamic range. The T20 is
shipped in Compressor Mode.
Noise Reduction Mode
The T20 can also be configured for for 2:1
compression. This is for use only with a receiver that
has a 2:1 expansion circuit for noise reduction.
Noise reduction is typically used in narrow-band
operation for high quality audio.
Soft Limit Mode
The T20 can also operate in a soft limit mode, which
allows full dynamic range of audio signals. This
mode may be preferred for musical programs, but
may provide too much dynamic range for hearing
impaired listeners.
Hard Limit Mode
Hard Limit Mode is useful if the T20 has been
installed with external signal processing.
For assistance in selecting an alternate audio
processing mode, contact Williams Sound technical
assistance at 1-800-328-6190.
Receiver Instructions:
Receiver Models R7, R7-4, R7-6, R16
Receiver Model PPA R7 has a single, wheel-type
volume control and an earphone output jack.
Step 1: To install the batteries, open the battery
compartment using a coin in the slot in the
bottom of the receiver. Press the batteries
into place, observing proper battery
polarity.
Step 2: Plug the earphone or headphone into the
earphone jack.
Step 3: Turn the receiver on by rotating the
volume control in the direction of the
arrow on top of the case. Turning the
knob in the direction of the arrow will
increase the volume. Turning the knob
against the arrow will decrease the
volume. To avoid draining the battery,
make sure the receiver is turned off when
not in use.
Step 4: If you are using the T20 with an existing
sound system, make sure the sound system
is turned on. Have someone speak into a
microphone while you listen with the
receiver and earphone. You should be able
to hear their voice through the receiver.
If you are using the T20 with a
microphone, have someone speak into the
microphone while you listen with the
receiver and earphone. You should be able
to hear their voice through the receiver.
Step 5: The T20 Transmitter has a screwdriver-
adjusted input level control located on the
front panel to compensate for different
input signal levels. Adjust the control so
the “OK” audio light flashes with the
signal. It’s alright if the “HI” light comes
on occasionally. Reduce the signal level by
turning the control counter-clockwise if
the “HI” light is on all the time.
If the “OK” light does not come on at all,
turn the T20 input level control clockwise
to increase the signal. If the input level
control is fully clockwise and the “OK”
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light still does not come on, you will need
to increase the signal level at its source
(mixer or P.A. amplifier).
Note: The earphone cord is the receiving
antenna. Do not bunch up the cord, wrap it
around the receiver, or place the receiver
in a shirt pocket. The cord should hang as
straight as possible.
Additional Receiver Instructions
PPA R7-4, PPA R7-6:
The R7-4 and R7-6 receivers feature a channel
selector knob on top of the receiver. Turn the
selector knob until you hear the desired program.
Model R16:
The R16 Receiver features a microphone input and
dual volume controls. The taller knob turns the
receiver on and off and controls the FM signal level.
The shorter knob controls the microphone signal
level. By adjusting the two volume controls, you can
hear a mixture of the FM signal and nearby sounds
picked up by the microphone. For more
information, see the instructions included with the
R16.
Battery Information
In normal use, a heavy-duty 9 Volt battery such as
the Eveready 216 will last about 10 hours. Alkaline
batteries such as the Eveready 522 will provide
about 17 hours of use. If the sound becomes weak or
distorted, replace the battery. The indicator light
may still be on, even with a battery that is weak.
Do not leave dead batteries in the receivers.
Rechargeable Batteries
The receivers can also use a rechargeable battery. We
recommend only 7-cell, 8.4 Volt types
(BAT 003). (Most batteries available through
department and radio stores are 6-cell, 7.2 Volt
types. They will not perform satisfactorily with
Williams Sound receivers and may be damaged by
the Williams Sound BAT 005 Charger) A fully-
charged battery (BAT 003) will provide about 5
hours of use per charge. The battery may be
recharged without removing it from the receiver.
The BAT 005 Single Charger has a cord that plugs
into the receiver “EAR” jack to charge the battery.
The CHG 1269A Multiple Charger can charge 12
receivers simultaneously through the receiver “EAR”
jacks.
Receivers can be left charging continuously when
not in use. The receiver should always be turned
OFF while charging. It takes about 14 hours to fully
charge the battery.
!! WARNING !!
DO NOT ATTEMPT TO RECHARGE
DISPOSABLE BATTERIES!
The batteries may heat up and burst, 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 result!
Use only Williams Sound Supplied chargers and
batteries!
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