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Listen Technologies LA-123 90 Design Manual

Listen technologies value package design guide and manual
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  • Page 3 Dear Valued Customer, Thank you for choosing Listen! All of us at Listen are dedicated to providing you with the highest quality products available. We take great pride in their outstanding performance because we care that you are completely satisfi ed. That’s why we independently certify them to the highest quality standards and back them with a limited lifetime guarantee.

  • Page 5: Table Of Contents

    Value Package Table of Contents Design Guide FM Technology Overview System Overview Key Concepts in Value Package Setup Alternative Options for Value Package Setup Notes LT-803-072 Stationary FM Transmitter Specifi cations Block Diagram Quick Reference Setup Instructions Operating Instructions Accessories Notes LR-200-072 FM Receiver Specifi...

  • Page 9: Fm Technology Overview

    Value Package Contents • (1) LT-803-072 Stationary 3-Channel FM Transmitter • (4) LR-200-072 Standard 3-Channel FM Receiver • (1) LA-123 90° Helical Antenna • (4) LA-161 Single Ear Bud • (1) LA-304 Assistive Listening Notifi cation Signage Kit • (1) LA-207 12 VDC Power Supply •...
  • Page 11 Frequency Modulation (FM) Technology Overview Frequency modulation or (FM) is a means of transmitting audio using electromagnetic waves. This same technology is used by local FM radio stations to broadcast music. FM signals can travel through most barriers – walls, fl oors, and ceilings. The distance a signal travels has many different variables such as Radio Frequency (RF) output power, the type and placement of the antenna, and the broadcasted frequency.

  • Page 12: System Overview

    The LT-803-072 transmitter modulates the audio on an FM carrier and transmits the signal via an antenna. Antenna The LP-3CV-072 includes the LA-123 90° Helical Antenna. This antenna has a BNC connector and should be mounted on the back of the LT-803-072. For further antenna options see page 11.

  • Page 13: Key Concepts In Value Package Setup

    Key Concepts in Value Package Setup Input Selection The LT-803-072 has two audio input options: Input 1 and Input 2. Input 1 is a balanced connection using either an XLR or ¼ in. phono connector, and input 2 is two unbalanced phono connectors. Use Input 1 if you are using a microphone or if you have a balanced connection such as a professional audio mixer (you can also use Input 1 for unbalanced connections).

  • Page 14: Mix Level

    Key Concepts in Value Package Setup Using Multiple inputs The LT-803-072 can accommodate multiple inputs simultaneously with the use of the input level potentiometer. When multiple inputs are present, both input level lights will be activated. Input Level Knob Mix Level The mix level acts as the “master transmit”...
  • Page 15 Key Concepts in Value Package Setup Selecting Transmitting Frequencies Use this section of the guide to choose the channel settings for the transmitter and receivers. Find transmission channel(s) The goal is to fi nd a transmission channel(s) that is free from interference. Interference comes from transmitters and other outside FM signals.
  • Page 16 Antenna placement (rear) Rear mounted antenna Rear mounting the LA-123 90° Helical Antenna (72 MHz) will allow the transmitter to be moved if necessary. Maximizing Transmission Range For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the originating transmitter.

  • Page 17: Alternative Options For Value Package Setup

    Alternative Options for Value Package Setup Remote antenna The LA-122 Universal Antenna Kit (72 and 216 MHz) and the LA-116 Coaxial Dipole Remote Antenna (72 MHz) connect to the LT-803-072 and can be placed away from the transmitter for better range. They also allow the unit to be rack mounted with the antenna remotely using the LA-326 Universal Rack Mounting Kit.

  • Page 18: Rack Mounting The Transmitter

    Key Concepts in Value Package Setup Rack Mounting the Transmitter The LT-803-072 can be rack mounted if necessary. With the use of the Listen LA-326 Universal Rack Mount Kit, you can mount one or two transmitters to the standard 19” rack. The rack mounted unit will take 1 ru of space. The antenna can also be in the front of the rack with the use of the LA-125 Antenna Kit for Rack Mount (72 MHz) and the LA-326 Universal Rack Mounting Kit.

  • Page 19: Notes

    Notes...
  • Page 20 Notes...
  • Page 24 LT-803-072 User’s Manual Table of Contents Specifi cations Block Diagram Quick Reference Setup Instructions Operating Instructions Accessories Notes Listen Confi gurations • LT-803-072-01 (North America) • LT-803-072-02 (Asia/UK) • LT-803-072-03 (Euro) LT-803-072 Package Contents • (1) LT-803-072 Stationary 3-Channel FM Transmitter •...

  • Page 26: Specifi Cations

    LT-803-072 Specifi cations The Stationary FM Transmitter shall be capable of broadcasting on one of any three channels – A (72.100 MHz), E (72.900 MHz) or H (75.900 MHz). The transmitter shall have a SNR of 62 dB or greater. The output power shall be adjustable to quarter, half or full.

  • Page 27: Block Diagram

    LT-803-072 Block Diagram 115/230VAC Universal Power 50/60 Hz Supply (provided) 12VDC, 1.3A ANTENNA Functions controlled by the CPU Module Input 1 VU Meter 12VDC Line Phantom Pwr Female XLR 1/4’ Combo Connector 2/Tip 3/Ring 1/Sleeve INPUT 1 POWER Power Supply CPU Module Down Listen LCD...

  • Page 28: Quick Reference

    LT-803-072 Quick Reference Input 1 and 2: Adjust audio input levels of Input 1 and Input 2 here. Input Level Indicators: Shows audio Input 1 and Input 2 levels. Test Tone: Activates a tone to aid system setup. Power Button: Turns unit On/Off. RF Output Indicator: Indicates transmitted RF power level.

  • Page 29: Setup Instructions

    LT-803-072 Setup Instructions Unpack the Product Remove outer packaging and plastic cover. Verify all components are present and no physical damage has occurred to the product. Mount LT-803-072(s) in Rack (if desired) If rack mounting the transmitter(s), install the optional rack mount kit (LA-326) according to the instructions included with the kit.
  • Page 30 LT-803-072 Setup Instructions Set RF power Set the RF POWER switch on the back of the unit to High, Medium, or Low (Level is indicated on the LCD display by number of dots above Listen logo). The amount of transmitted RF power that you will need depends on your application.

  • Page 31: Operating Instructions

    LT-803-072 Operating Instructions Power Unit On Select a Channel Select the transmit channel (A, E, H) by pressing the channel select UP/DOWN buttons. Lock on Channel Once you determine your transmit channel, you can lock the transmitter on that channel. To lock a channel hold the Channel Select UP button for 3 seconds until the padlock icon appears on the display.
  • Page 32 LT-803-072 Operating Instructions Test Tone (if necessary) Use the test tone to transmit a 400 Hz tone. This tone will allow the receiver to know if the system is transmitting properly. All receivers should be able to hear this tone if tuned to the proper channel. Adjusting Audio Levels Adjust Audio Input Level Turn the input knob counter-clockwise to add gain to Input 1.
  • Page 33 LT-803-072 Operating Instructions Adjusting the Contour knob Turn the contour knob counter-clockwise if your audio source is mostly voice. Turn the knob clockwise if your audio source is mostly music. The contour knob adjusts the relative equalization of the unit. This equalization boosts or cuts frequencies above 5 kHz.
  • Page 34 LT-803-072 Operating Instructions Process Mode Process mode is used for Audio Gain Control (AGC). Press and hold the down button for 10 seconds to activate program mode. Press up button to toggle process On/Off. With the process mode enabled, the LT-803-072 will automatically adjust for inconsistent signal input levels by raising or lowering the signal level accordingly.

  • Page 35: Accessories

    LA-101 Helical Top Mounted Antenna (72MHz) LA-106 Telescoping Top Mounted Antenna (72 MHz) LA-116 Coaxial Dipole Remote Antenna (72MHz) LA-122 Universal Antenna Kit (72 and 216 MHz) LA-123 90˚ Helical Antenna (72 MHz) LA-125 Antenna Kit for Rack Mount (72 MHz) LA-123 Power Supply...

  • Page 36: Notes

    Notes...

  • Page 40: Specifi Cations

    LR-200-072 User’s Manual Table of Contents Specifi cations Block Diagram Quick Reference Setup Instructions Accessories Notes Listen Confi gurations • LR-200-072 LR-200-072 Package Contents • (1) LR-200-072 Standard 3-Channel FM Receiver (72 MHz) • (1) Quick Reference Card C E IV D R E D A R S TA N...
  • Page 42 LR-200-072 Specifi cations The FM receiver shall be capable of receiving on three wide band channels. The receiver shall have a SNR of 62 dB or greater. The device shall have an audio frequency response of 50 Hz to 15 KHz, ± 3 dB at 72 MHz.
  • Page 43 LR-200-072 Block Diagram LCD Display Down Power Supply CPU Module Seek Universal 115/230VAC Power charge indicator Power Supply 50/60 Hz Red LED (not included) Alkaline NiMH (2) AA Batteries ALkaline or NiMH POWER ANTENNA de-emphasis de-modulation VOLUME 3.5 mm Connector Sleeve Ring...
  • Page 44 LR-200-072 Quick Reference Power/Charging Port Front Door Lock Channel Select Switch: There are 3 separate channels (A, E, H) available. 3.5 mm Output Jack: Connect a Listen earphone(s) here. LED: When lit, unit is On or charging. When batteries are low, the LED fl ashes. On/Off and Volume Control Dial le c t ry S e...

  • Page 45: Select Battery Type

    Remove the product Remove outer packaging and plastic cover. Inspect for physical damage. If damage is apparent, please contact the dealer from which the product was purchased or Listen Technologies Corporation technical support for assistance (refer to page 55 for contact information).

  • Page 46: Channel Select

    LR-200-072 Setup Instructions Channel Select Set channel select switch to desired channel (A, E, H). Make sure that the channel on both receiver and transmitter are the same. Place Batteries in Unit Insert two AA batteries making note of the battery polarity shown in the battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position for the batteries you are using.
  • Page 47 LR-200-072 Setup Instructions Turn the Unit On Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of the unit will illuminate. If it does not, make sure you have installed the batteries correctly and that you are using fully charged batteries. Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level.
  • Page 48 Accessories for LR-200-072 Accessories Headphones LA-161 Single Ear Bud LA-162 Stereo Ear Bud LA-164 Ear Speaker LA-165 Stereo Headphones LA-166 Neck Loop LA-170 LA-170 Behind-the-Head Stereo Headphones LA-171 Noise Canceling Headphones Power/Charging Supplies LA-202 Power/Charging Supply for FM Portable Products LA-202 Cables LA-265 Consumer Camcorder Cable...
  • Page 49 Notes...
  • Page 50 Notes...
  • Page 54 Supplementary Information Table of Contents Battery Charging Information Frequency Chart Troubleshooting Frequently Asked Questions Compliance, Warranty and Contact Information Notes...

  • Page 56: Battery Charging Information

    Battery Charging Information The LR-200-072 receiver uses a trickle charging method. When one of these receivers is placed into a Listen charging case any NiMH batteries will be charged. The entire charging process takes 10-12 hours under normal conditions. During the charging cycle, the red LED on top of the Listen product will remain illuminated. When not using the receiver, it is recommended to leave the unit in the charging case or plugged into the LA-202 power source.

  • Page 57: Frequency Chart

    Frequency Chart Channel Frequency (MHz) 72.100 72.900 75.900...

  • Page 58: Troubleshooting

    Troubleshooting The LT-803-072 has no power. Make sure the 12 VDC power transformer is connected to a power source and is connected to the jack marked “Power Input”. Make sure the PWR button is pressed in. There is no audio or the audio level is too low. 1.

  • Page 59: Troubleshooting

    Troubleshooting There is interference in my transmission. Ensure that the transmitter and receivers are on the same channel. Verify that there are no other transmitters on the same channel or a close channel to the one exhibiting interference. Try different channels until you fi nd a clear channel. Please contact Listen for more ideas on troubleshooting the interference.

  • Page 60: Frequently Asked Questions

    Frequently Asked Questions What is the range of the LT-803-072 transmitter? Line of site up to 1000 ft. (304.8 m). Does the LT-803-072 include the rack mount? No, but an LA-326 Universal Rack Mounting Kit is available for purchase. Do I need a transmitter for each audio source? Yes.

  • Page 61: Compliance Notice And Fcc Statement

    This device must be installed by a trained audio professional or certified dealer of Listen. The user can’t make any modifications to the unit without expressed written consent of Listen Technologies Corporation. Any modifications made will void the FCC compliance, Listen warranty and the users authority to operate Listen’s equipment.

  • Page 62: Warranty And Contact Information

    All Listen European markets are supported through the Listen Technologies GmbH offi ce located in Oberasbach, Germany. For more information on Listen solutions, contact Listen Technologies at +1.801.233.8992, +1.800.330.0891 North America, Listen Technologies GmbH at +49 911 955159-0 or visit www.listentech.com. For Europe, Middle East, Africa and India offi ce visit www.listentech.de.

  • Page 63: Notes

    Notes...
  • Page 64 Notes...
  • Page 65 Bluffdale, Utah 84065-4818, U.S.A. +1.801.233.8992 +1.800.330.0891 North America +1.801.233.8995 www.listentech.com info@listentech.com Listen Technologies GmbH Jasminstr. 16 905 22 Oberasbach, Germany +49 911 955159 0 EMEAI +49 911 955159 40 www.listentech.de info@listentech.de © 2008 Listen Technologies Corporation ® All Rights Reserved 20080129...

This manual is also suitable for:

La-161Lp-3cv-072Lr-200-072Lt-803-072Lr-200Lt-803 ... Show all

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