PDA103 TECHNICAL SPECIFICATION
Rated supply voltage:
110 to 240Va.c. @ 50/60Hz
Rated power consumption:
18W PSU
Maximum RMS output current:
4A @ 1kHz
Maximum RMS load voltage:
5.5V
PDA103C approx. coverage area
using the TX2 pre-formed loop:
1.2m2
PDA103R/L/S approx. coverage area
using 0.5mm2 loop cable:
50m2, i.e. rooms up to approx. 7m x 7m
Recommended number of turns:
Single turn
Recommended loop conductor size:
0.5mm2 @ < 50m loop length
Frequency response -3dB:
120Hz to 5kHz as per BS EN 60118-4
Input signal level:
Mic: -60dB unbalanced; Line: -27dB stereo
unbalanced; Outreach: -10dB balanced.
Input impedance:
Mic: 1k ohm; Line: 100k ohm; Outreach: 20k ohm.
Microphone phantom power:
12Vd.c.
Signal to noise ratio, A weighted:
-62dB
Optical TOS-link receiver:
Up to 24 bit, 96kHz sampling
AGC range (3dB change in output
current), reference rated I/P voltage:
AGC ratio:
Amplifier mode:
PDA103
AUDIO-FREQUENCY
INDUCTION LOOP AMPLIFIER
10dB
20:1
True current mode
INSTALLATION INSTRUCTIONS
This equipment must be installed by a suitably skilled and technically competent
person. Please read these instructions carefully before installation.
Sensitivity level controls:
Mic, Line, Digital, Outreach, Metal Compensation,
Level (all rotary pot controls are screwdriver
adjustable).
LED indicators:
Limit (Red), Peak (Red), Loop Fault (Red), Power On
(Green).
Connectors:
Mic (3.5mm mono jack socket); Line (3.5mm stereo
jack socket); Digital; Outreach (4-way pluggable
screw terminal; DC in; Loop (2-way pluggable
screw terminal).
Dimensions (H x W x D):
Weight:
IP Rating (to EN 60529):
35mm x 135mm x 130mm (including controls)
380g (amplifier only)
IP40
Overview of the PDA103 induction loop amplifier .............................................................. 4/5
Operating temperature:
00C to 400C
Typical PDA103C 1.2m2 counter loop system ........................................................................ 6
The PDA103 is a true current mode, audio-frequency induction loop amplifier. It may be
surface-mounted and is designed to cover ticket counters up to 1.2m2 (PDA103C kit version),
or rooms up to 50m2 (PDA103R/L/S kit versions).
Safety guidelines, important notes and product safety notes........................................... 2
PDA103 kit contents ............................................................................................................... 3
Typical PDA103R/L 50m2 small room systems ........................................................................ 7
Typical PDA103S 50m2 domestic TV/music lounge loop system .......................................... 8
Overview of the outreach plate audio extension system ................................................... 9
Mounting the amplifier ......................................................................................................... 9
System set-up and testing ................................................................................................. 10/11
PDA103 technical specification ............................................................................................. 12
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PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
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SAFETY GUIDELINES
8
Avoid placing the PDA103 amplifier in areas:
• with poor ventilation
• exposed to direct sunlight
• with high ambient temperatures
• adjacent to heat generating equipment
• with high humidity or dust levels
• susceptible to severe vibration
9
WARNING: The surface of this unit may become hot during continued use.
10
These instructions are general and cannot be considered to cover every aspect of audiofrequency induction loop system (AFILS) design and installation.
We recommend you read BS 7594 - The Code of Practice for Audio-Frequency Induction Loop
Systems and BS EN 60118-4 - Magnetic field strength in audio frequency induction loop
systems for hearing aid purposes. Other National standards of
design/installation/commissioning should be referenced where pertinent.
For safety reasons, the amplifier may shutdown to protect it from overheating if too much
current passes through its sensitive protection circuitry.
Turn the Level control clockwise until the red Peak
indicator just lights during periods of high signal level,
i.e. when the red Limit indicator just lights.
Product Safety Note: If the system is set up so that the
Peak indicator is permanently lit, the audio sound quality
will be distorted and the amplifier may shutdown to
protect it from overheating.
If high metal content is present in, or near, the induction
loop, the sound heard by the loop listening device may
be ‘woolly’ or ‘dull’. To rectify this problem, turn the
Metal Compensation control clockwise in small
increments until a natural balance is achieved.
L
M
Peak
Level
L
Metal
Compensation
Note 2: If the Peak indicator lights strongly, turn the
Level control anti-clockwise and then adjust the Metal
Compensation control. You may have to adjust both
these controls several times to achieve optimum volume
and tone.
Equipment guarantee
PRODUCT SAFETY NOTES
Limit
Note 1: If high metal content is present, the amplifier’s
area of coverage will be reduced and further reduced as
the Metal Compensation control is turned clockwise.
This product has been manufactured in conformance with the requirements of all
applicable EU directives.
This equipment is not guaranteed unless the system is installed and commissioned in accordance
with regional or national standards by an approved and competent person or organisation.
Mic
Line
Outreach Digital
L
DO NOT dismantle or attempt to modify the amplifier. No user-serviceable fuses or parts are
included inside the amplifier. For repair, contact your supplier.
IMPORTANT NOTES
With the relevant audio input source(s) active, turn the
appropriate Outreach/Digital/Line/Mic level control(s)
clockwise until the red Limit indicator is flashing
occasionally.
11
Using an induction loop test receiver, listen to the loop
signal in all areas where coverage is required (we
recommend you use a Fosmeter Pro for this purpose, see
Additional Testing below). If the signal level is not
acceptable, adjust the Level control in small increments
until it is.
This may occur when the unit’s DC power supply is connected (see Page 5, Loop Fault Indicator
for details), or if the Peak indicator remains permanently lit (see Page 11, Step 9 for details).
Additional testing
Induction loop systems require careful testing and calibration prior to operation. BS EN
60118-4 - Magnetic field strength in audio-frequency induction loops for hearing aid
purposes, recommends that the achievable magnetic field strength of an induction loop
system over a ‘covered area’ should be 400 mA RMS per metre.
© Errors and omissions excepted. No responsibility can be accepted by the manufacturer or distributors of this equipment for any
misinterpretation of this instruction, or for the compliance of the system as a whole. The manufacturers policy is one of continuous
improvement and we reserve the right to make changes to product specifications at our discretion and without prior notice.
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PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
The most efficient way of ensuring this requirement is met is to test and set-up the system
using an FPROK induction loop test kit. This kit includes a handheld Fosmeter Pro 400mA
magnetic field strength meter and a loop listener (for measuring background noise,
frequency response and metal compensation). Contact your supplier for more information.
PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
11 of 12
PDA103 KIT CONTENTS
SYSTEM SET-UP AND TESTING
IMPORTANT: DO NOT power up the system before completing Step 7 below.
The amplifier MUST NOT be operated without a loop connected to it.
1
Install the loop cable.
BEFORE connecting the loop to the amplifier, use a multimeter to check the loop is not
shorted to ground at any point. It WILL damage the amplifier if it is.
The PDA103 audio frequency induction loop system (AFILS) amplifier is available in the
following kits.
PDA103C 1.2m2 Counter Loop Kit:
1 x PDA103 AFILS amplifier
1 x 230Va.c. PL1/PSU1 plug-top power supply
1 x TX2 pre-formed counter loop cable and fixings
2
3
Connect the loop cable (supplied) to the amplifier.
Remove approx. 6mm of the outer insulation from each
end of the loop cable, then secure both ends to the screw
terminals of the 2-way loop cable connector (supplied).
Next, plug the 2-way connector into the amplifier’s Loop
connector.
Loop
1 x AMT tie/desk microphone c/w 1.5m lead and attachments
1 x Accessory pack containing the installation instructions (this document), four cable ties,
four self-adhesive cable tie bases, one 4-way ‘outreach’ connector, one 2-way loop cable
connector, one ‘induction loop in use’ sticker.
PDA103R 50m2 Small Room Loop Kit (‘outreach’ microphone version):
1 x PDA103 AFILS amplifier
If relevant, plug the AMT microphone, or an alternative
electret microphone, into the amplifier’s Mic connector.
1 x 230Va.c. PL1/PSU1 plug-top power supply
Mic
1 x APM ‘outreach’ plated microphone c/w 6m Belden cable
1 x 40m of 0.5mm2 induction loop cable
1 x Accessory pack (as per the PDA103C kit).
4
If relevant, plug the audio line level into the amplifier’s
Line input, or TOS-link connector cable (not supplied) into
the amplifier’s Digital connector.
Line
Digital
PDA103L 50m2 Small Room Loop Kit (tie/desk microphone version):
1 x PDA103 AFILS amplifier
1 x 230Va.c. PL1/PSU1 plug-top power supply
1 x AMT tie/desk microphone c/w 1.5m lead and attachments
1 x 40m of 0.5mm2 induction loop cable
1 x Accessory pack (as per the PDA103C kit).
5
If relevant, connect the outreach system to the amplifier.
Remove approx. 6mm of the outer insulation from all
cable ends, then secure the ends to the screw terminals of
the 4-way outreach connector (supplied). Next, plug the
4-way connector into the amplifier’s Outreach connector.
Outreach
PDA103S 50m2 Domestic TV/Music Lounge Loop Kit:
1 x PDA103 AFILS amplifier (with TOS-link connector)
1 x 230Va.c. PL1/PSU1 plug-top power supply
1 x APL dual phono line level ‘outreach’ plate c/w 6m Belden cable
1 x APS SCART to dual phono connection lead
6
Ensure the amplifier’s Outreach, Digital, Line, Mic, Metal
Compensation and Level pot controls are set to minimum
by turning them fully anti-clockwise.
1 x 40m of 0.5mm2 induction loop cable
Outreach Digital
Line
Mic
1 x Accessory pack (as per the PDA103C kit).
Metal
Compensation
Level
7
Connect the plug-top power supply (supplied) to a
standard 13A, 230Va.c. mains socket and then to the
amplifier’s DC in connector. Ensure the amplifier’s green
Power On indicator lights.
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PDA103 Installation Instructions
DC in
Approved Document No. DAU0000103 Rev 2
PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
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OVERVIEW OF THE PDA103 INDUCTION LOOP AMPLIFIER
OVERVIEW OF THE OUTREACH PLATE AUDIO EXTENSION SYSTEM
* The digital connector and digital level control shown below only applies to the amplifier
supplied with the PDA103S kit which has a TOS-link connector.
The PDA103 is fully compatible with the outreach plate audio input extension system. This
system allows the connection of multiple microphone, or line level inputs via a range of
specially designed wall, ceiling or desk-mountable single gang plates.
General operation
The amplifier mixes and amplifies the microphone, line, digital and outreach input signals
and feeds them through its sophisticated automatic gain control (AGC) circuitry before
outputting them to the induction loop.
Connectors, controls and indicators
Up to ten outreach plates (any mix) can be daisychained to the amplifier’s ‘outreach’
connector (supplied) with cable lengths up to 100m (total network length) easily achievable
using standard two pair audio cable such as Belden 8723 - see typical wiring diagram below.
Contact your supplier for more information.
Below is a overview of the PDA103’s connectors, pot level controls and LED indicators.
GREEN (A+)
To next optional
outreach plate
2
1
Line
Mic
3*
4
Outreach
Digital
WHITE (A-)
RED (V+)
BLACK (GND)
A A IN +
B A IN -
A OUT + E
A OUT - F
PDA103
4-way Outreach
Connector
Outreach Plate
Outreach Plate
A A IN +
B A IN -
C V+
C V+
D GND
D GND
A OUT + E
A OUT - F
GREEN (A+)
WHITE (A-)
RED (V+)
BLACK (GND)
A+
AV+
GND
Audio input
Audio input
MOUNTING THE AMPLIFIER
The amplifier can be surface-mounted in any orientation, provided the controls are accessible
and indicators clearly visible.
9
Limit
10
Peak
Metal
Compensation
7
11
Loop Fault
Level
8
12
Power On
Surface-mounting
Using mounting screws (not supplied) fix the amplifier securely to the chosen wall, desk or
side of counter, as appropriate. Always assess the condition and construction of the
mounting surface prior to installation and use suitable screw fixings (No. 8-10, or 4-5mm
screws).
120mm
5mm (x4)
103
DCin -
+
14V to 20V
5
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PDA103 Installation Instructions
Loop
Surface-mounting
fixing details
6
Approved Document No. DAU0000103 Rev 2
PDA103 Installation Instructions
95mm
Approved Document No. DAU0000103 Rev 2
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TYPICAL PDA103S 50m2 DOMESTIC TV/MUSIC LOUNGE LOOP SYSTEM
2
Inputs & Controls
1
1
3
Outreach
Line
Digital
Mic
2
Limit
Peak
Metal
Compensation
Loop Fault
Level
Power On
103
DCin -
+
14V to 20V
Loop
3
4
4
5
AFILS sticker:
Position the sticker where it can be clearly seen by hearing
aid users.
2
APL dual phono line
level ‘outreach’ plate
c/w APS SCART lead &
Belden connection cable:
Surface-mount the APL plate onto a standard 25mm UK
back box - a 6m length of Belden cable is provided for
connecting the APL to the amplifier. The APS SCART lead
(supplied), should be connected to the audio source
(normally a TV) and the APL plate.
3
Amplifier location:
The amplifier should be surface-mounted and sited as close
as possible to the equipment to which it is connected.
Loop cable:
Run the loop cable horizontally around the perimeter of
the room. For best results, tuck the cable under the edge
of the carpet or fixed to skirting boards or the ceiling.
If installing a floor loop, ensure the loop cable is protected
from being crushed in walkways or by furniture.
4
Note: As an alternative to using the APL plate, the amplifier supplied with the PDA103S kit
has a TOS-link digital connector and most modern televisions can be directly connected to
the amplifier using a TOS-link cable (not supplied).
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Line input:
3.5mm stereo jack input for connecting an audio (line) source.
Line control:
Adjusts the sensitivity of the audio line level input.
Digital input:
TOS-link digital input (PDA103S kit only).
Digital control:
Adjusts the sensitivity of the TOS-link input (PDA103S kit only).
Outreach input:
4-way input for the outreach plate audio input system.
Outreach control:
Adjusts the sensitivity of the outreach input.
DC in:
2.5mm DC power supply connector. The amplifier operates at
20Vd.c. Only the plug-top power supply (supplied) should be
connected to the amplifier.
Outputs & Controls
PDA103S Kit Components
1
Mic control:
3.5mm mono jack input supplied with 12V phantom power
for use with electret microphones. Note that dynamic
microphones are NOT compatible with this input.
Adjusts the sensitivity of microphone level input.
Mic input:
PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
6
Loop output:
2-way induction loop connection.
7
Metal Compensation
control:
In applications with high metal content, this control can be
used to help combat the frequency response problems caused
by metal ‘absorbing’ the magnetic field.
8
Level control:
Adjusts the strength of the magnetic field generated by the
induction loop.
Indicators
9
10
Limit:
Peak:
Illuminates red to confirm the AGC circuitry is functioning.
Illuminates red in line with peaks in the input signal(s).
Illuminates steady red when the induction loop is unintentionally
connected to an input ground. To rectify, turn off the mains power
supply and check for loop wiring faults.
11
Loop Fault:
Product Safety Note: When the DC power supply is connected to the
amplifier (with the mains on), this indicator may light and the
amplifier will shutdown. If this happens, turn off the mains power
switch and wait for 10 seconds before switching mains power back on.
12
Power On:
Illuminates green when the amplifier is receiving power.
PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
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TYPICAL PDA103C 1.2m2 COUNTER LOOP SYSTEM
TYPICAL PDA103R 50m2 SMALL ROOM LOOP SYSTEM (‘outreach’ mic. version)
2
1
MULTIPLE
COUNTER LOOPS
If multiple counter loops are
required in close proximity, it
is possible that the ‘field’
generated by one system may
be picked up by a person who
is standing at the next. Adjust
the field strength and loop
shape to avoid this.
2
3
3
1
4
TYPICAL PDA103L 50m2 SMALL ROOM LOOP SYSTEM (tie/desk mic. version)
4
1
5
PDA103C Kit Components
1
AFILS sticker:
2
AMT tie/desk
microphone
c/w 1.5m lead:
Position the sticker where it can be clearly seen by hearing aid users.
Position the microphone as close as possible to mouth height using
the self-adhesive pad (supplied). For best results position it no nearer
than 300mm and no further than 1.2m distance from the operator’s
mouth. Avoid mounting it near sources of unwanted noise, e.g. a
cooling fan, or a telephone.
Fix the pre-formed TX2 counter loop (supplied) to the underside of
the counter, desk or table.
3
Loop cable:
For best results in counter applications:
Bend the opened out ‘squared’ loop at a right angle half way down
its length. Secure half the square to the underside of the desk and
run the other half down the inside of the back vertical surface.
For best results in desk/table applications:
Secure the opened out ‘squared’ loop to the underside of the table
at the end nearest to the hearing aid user. Another option is to fit
the loop above a suspended ceiling. Again, position the loop so that
it is central to where the hearing aid user would naturally stand.
4
Amplifier
location:
Mount the amplifier to the side of the counter using suitable screws.
PDA103R / PDA103L Kit Components
1
2
3
4
5
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PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
3
4
AFILS sticker:
Position the sticker where it can be clearly seen by hearing aid users.
For best results it should be mounted on a standard 25mm back
APM ‘outreach’
box, ideally on a suspended ceiling height of 2.5 to 3m although it
plated microphone can also be surface-mounted. If mounting the microphone at
ceiling height, avoid positioning it too close to ventilators, or air
c/w Belden
conditioning ducts. 6m of Belden cable is included for connecting
connection cable:
the APM to the amplifier.
Loop cable:
Run the loop cable horizontally around the perimeter of the room,
ideally located at ceiling height (e.g. above a suspended ceiling) or
tucked under the edge of a carpet, or fixed to skirting boards.
If installing a floor loop, ensure the loop cable is protected from
being crushed in walkways, or by furniture.
Surface-mount the amplifier using suitable mounting screws.
PDA103R only: To avoid unsightly connection leads, the amplifier
Amplifier location: may be mounted above a suspended ceiling, particularly if a
ceiling loop is fitted to reduce wiring runs.
AMT tie/desk
microphone
c/w 1.5m lead:
Position the microphone as close as possible to the user using the
self-adhesive pad (supplied). For best results position it no nearer
than 300mm and no further than 1.2m distance from the
operator’s mouth. Avoid mounting it near sources of unwanted
noise, e.g. a cooling fan, or a telephone.
PDA103 Installation Instructions
Approved Document No. DAU0000103 Rev 2
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