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VL1
12V MINI AUDIO-FREQUENCY
INDUCTION LOOP AMPLIFIER
The VL1 is a true current mode audio-frequency induction loop amplifier. Its compact
design, 12V d.c. operation and availability in a variety of kit formats make it ideally
suited for use in:-
• Cars, taxis, buses and other private/commercial vehicles (VL1/B1 or VL1/B2 kits)
• Ticket counters and other desktop applications (VL1/C kit)
• Access control applications (VL1/A kit)
In addition to this instruction manual, all of the above kits include Quick Start installation
guides specific to the application(s) for which they are intended. These guides should
always be referenced in conjunction with this manual prior to installation.
Important notes ................................................................................................................................... 2
Safety guidelines .................................................................................................................................. 2
What is an audio frequency induction loop system? ...................................................................... 3
An overview of the VL1 induction loop amplifier ........................................................................... 4
Planning an induction loop system .................................................................................................... 5
Installation, system set-up and testing ........................................................................................... 6/7
Troubleshooting ................................................................................................................................... 8
Technical specification ......................................................................................................................... 8
Approved document No. DCM0003479 Rev 1 • Page 1 of 8
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Summary of Contents for PDA Range VL1
- Page 1 12V MINI AUDIO-FREQUENCY INDUCTION LOOP AMPLIFIER The VL1 is a true current mode audio-frequency induction loop amplifier. Its compact design, 12V d.c. operation and availability in a variety of kit formats make it ideally suited for use in:- • Cars, taxis, buses and other private/commercial vehicles (VL1/B1 or VL1/B2 kits) •...
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Page 2: Important Notes
Ensure the loop cable and all relevant audio/microphone and power lead(s) are fixed securely into position before operation. Do not leave any trailing leads or obstructions. The VL1 amplifier is capable of producing short-term peaks of twice its rated current. Approved document No. DCM0003479 Rev 1 • Page 2 of 8... - Page 3 WHAT IS AN AUDIO-FREQUENCY INDUCTION LOOP SYSTEM? An audio-frequency induction loop system allows hearing impaired people to hear more clearly. Most hearing aids have a ‘T’ or ‘MT’ switch which allows them to pick up the electromagnetic field generated by an induction loop system.
- Page 4 The Power indicator illuminates green when the amplifier is powered up. The amplifier operates at 12V dc. Dependent on the application and VL1 kit pur- chased, this can be derived from a plugtop mains adaptor, a fused cigarette lighter adaptor or a local 12V power source and connection lead, all of which connect to the amplifier’s 2.5mm 12V DC socket.
- Page 5 The TX2 loop can be positioned either horizontally or vertically. In all instances, the exact position of the loop will depend on the application and the area requiring cover- age - refer to the Quick Start installation guide supplied with your VL1 kit for further information.
- Page 7 METAL COMPENSATION control is turned clockwise. 11. For compliance with BS7594 (the code of practice for audio-frequency induction loop systems), we recommend you test the system using our PDA RANGE FPROK1 induction loop test kit. Please contact your distributor for details.
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Page 8: Troubleshooting
TROUBLESHOOTING If no sound is being picked up by the hearing aid or induction loop test receiver, first check that the amplifier’s green Power indicator is lit. If the Power indicator IS NOT lit:- Check that the power lead is correctly plugged into the mains supply and the amplifier. If the power indicator is still not lit, the power lead or the amplifier could be faulty.
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