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Listen Technologies 863.050 User Manual

Stationary fm system 863 mhz
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  • Page 3 Here’s how to reach us: +1.801.233.8992 +1.800.330.0891 North America + 1.801.233.8995 Fax support@listentech.com www.listentech.com Listen Technologies GmbH Jasminstr. 16 905 22 Oberasbach, Germany +49 911 955159 0 +49 911 955159 40 www.listentech.de...

  • Page 5: Table Of Contents

    Stationary FM Table of Contents Design Guide FM Technology Overview System Overview Key Concepts in Designing an FM System Notes LT-800-863 Stationary FM Transmitter Specifi cations Block Diagram Quick Reference Setup Instructions Operating Instructions Accessories Notes LR-400/500-863 FM Receivers Specifi cations Block Diagram Quick Reference Setup Instructions...

  • Page 9: Table Of Contents

    Stationary FM Design Guide Table of Contents Table of Contents Technology Overview System Overview Key Concepts in Designing an FM System Notes...

  • Page 11: Technology Overview

    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

    System Overview There are four main parts to a Stationary FM system – transmitter, antenna, receiver and input source, . LT-800-863 Stationary FM Transmitter (863 MHz) Input source LA-129 90° Articulating Antenna (863 MHz) (Included with Transmitter) LR-400-863 LR-500-863 Portable Display FM Portable Programmable Receiver (863 MHz) Display FM Receiver...
  • Page 13 System Overview Antenna There are a several options for antennas. Antennas can either be back-mounted on the unit or remote mounted. LA-130 Remote Antenna Kit (863 MHz) LA-129 90° Articulating Antenna (863 MHz) (Included with Transmitter) LA-131 Antenna Kit for Rack Mount (863 MHz) Receivers Listen offers two different portable receivers: the LR-400 and LR-500.

  • Page 14: Key Concepts In Designing An Fm System

    Key Concepts in Designing a Stationary FM System Input Selection The LT-800 has two audio input options: Input 1 and Input 2. Input 1 is a balanced connection using either an XLR or ¼” phono connector, and input 2 is two unbalaned phono connectors. Use Input 1 if you are using a microphone or if you have a balanced connection such as from a professional audio mixer (you can also use Input 1 for unbalanced con- nections).
  • Page 15 Key Concepts in Designing a Stationary FM System Input 2: Connect the audio source(s) Plug your unbalanced audio source into Input 2 and select the audio level switch for -10 dBu or +10 dBu to match the audio level coming from your equipment. Using Two inputs The LT-800 can accommodate two inputs simultaneously with the use of the input level potentiometer.
  • Page 16 Key Concepts in Designing a Stationary FM System 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 other transmitters and from other equipment (such as a computer).
  • Page 17 Key Concepts in Designing a Stationary FM System Antenna placement (rear or remote) Rear mounted antenna Rear mounting the LA-129 90° Articulating Antenna (863 MHz) will allow the transmitter to be moved if necessary. Remote antenna The LA-130 Remote Antenna Kit connects to the LT-800 and can be placed away from the transmitter for better range.
  • Page 18 Key Concepts in Designing a Stationary FM System Front of the rack mounted antenna The antenna can also be in the front of the rack with the use of the LA-131 Antenna Kit for Rack Mount (863 MHz) and the LA-326 Universal Rack Mounting Kit. Maximizing Transmission Range For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the originating transmitter.
  • Page 19 Key Concepts in Designing a Stationary FM System Orientation Orient both transmitting and receiving antennas vertically. RF Power switch Position the RF Power switch on the back of the LT-800 to full RF Power, unless lower power is necessary. RF Power Switch Cable Length Keep coaxial cable from transmitter to antenna as short as possible.
  • Page 20 Key Concepts in Designing a Stationary FM System Mounting Transmitter The LT-800 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. Rack Mount with dual units installed.
  • Page 21 Key Concepts in Designing a Stationary FM System Multiple Channels Guidelines for multiple channels in multiple and single spaces. Example #1 A museum patron walks to an exhibit and needs to listen to one channel at a time. In general, such systems work very well because of what is called “capture effect”. A Listen receiver will lock onto or “capture”...
  • Page 22 Key Concepts in Designing a Stationary FM System Example #2 Meeting participants need to select any one of, say, four language interpretations of the meeting. • In general, space the channels as far as possible from each other. For example, if four channels are needed from transmitting signals, using channels 1, 4, 8, and 12 would be recommended (please see the channel/fre- quency chart on page 70 for the list of frequencies).

  • Page 23: Notes

    Notes...
  • Page 24 Notes...
  • Page 29 LT-800 User’s Manual Table of Contents Specifi cations Block Diagram Quick Reference Setup Instructions Operating Instructions Accessories Notes LT-800-863 Package Contents • LT-800-863 • Quick Reference Sticker • LA-129 90° Articulating Antenna • 12 VDC Power Supply • Line Cord •...
  • Page 31 (monitor). The device shall have an audio processor that is capable of automatic gain control and limiting. The Listen LT-800-863 is specifi ed. Specifi cations LT-800-863 RF Frequency Range 863.050 - 864.950 MHz Number of Channels 17 Wideband Frequency Accuracy +/-.005% stability 0- 50C...

  • Page 32: Block Diagram

    LT-800-863 Block Diagram POWER 115/230VAC Universial Power 50/60 Hz Supply (provided) 12VDC, 1.3A Power Supply CPU Module Down MONITOR Volume Listen LCD Display Backlit Compression Ratio (internal ajustment) MIX Level VU Meter ANTENNA Transmitter Pre-emphasis Companding Processing RF Board MIX LEVEL Green LED High Functions controlled by...

  • Page 33: Quick Reference

    LT-800-863 Quick Reference Input Level Indicators: Shows audio Input 1 and Input 2 levels. Mix Audio Level: Shows mixed level. Input 1 and 2: Process LED: Indicates audio processing Adjust audio input mode is active. levels of Input 1 and Input 2 here. Monitor Jack: Plug in a headset to monitor audio.

  • Page 34: Setup Instructions

    LT-800 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-800(s) in Rack (if desired) If rack mounting the transmitter(s), install the optional rack mount kit (part LA-326) according to the instructions included with the kit.
  • Page 35 LT-800 Setup Instructions Set RF power Set the RF POWER switch on the back of the unit to Full, ½ or ¼ (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 36: Operating Instructions

    LT-800 Operating Instructions Power Unit On Power Button Select a Channel Select the transmit channel by pressing the channel select UP and DOWN buttons. Channel select up and 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”...
  • Page 37 LT-800 Operating Instructions Test Tone (if necessary) Use the test tone to transmit a 400 Hz tone. This tone will allow the end user to know if the system is transmitting properly. All receivers should be able to hear this tone if tuned to the proper channel. Test Tone Button Adjusting Audio Levels Adjust Audio Input Level...
  • Page 38 LT-800 Operating Instructions Adjusting the Contour knob Adjust the contour knob counterclockwise if your audio source is mostly voice. Adjust 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 39 LT-800 Operating Instructions Process Mode Process mode is used for Audio Gain Control (AGC). With the process mode enabled, the LT-800 will automatically adjust for inconsistent signal input levels by raising or lowering the signal level accordingly to provide a consistent sound output level. This feature should be used in applications where a consistent sound level is important and the input levels vary substantially.

  • Page 40: Accessories

    Accessories for LT-800-863 Accessories LA-131 LA-130 Antenna Kit for Rack Mount (863 MHz) Remote Antenna Kit (863 MHz) (01) (02) (03) LA-304 LA-207 Assistive Listening 12 VDC Power/Charging Notifi cation Signage Kit Supply for FM Portable Products LA-207-01 North America LA-207-02 Asia/UK LA-207-03 Euro LA-326...

  • Page 41: Notes

    Notes...
  • Page 42 Notes...
  • Page 43 Notes...
  • Page 44 Notes...
  • Page 49 LR-400/500 User’s Manual Table of Contents Specifi cations Block Diagram Quick Reference Setup Instructions Operating Instructions Programming Instructions (LR-500 only) Accessories Notes LR-400/500 Package Contents • LR-400/500 • Quick Reference Card • Warranty Card LR-500-863 LR-400-863 Portable Programmable Portable Display Display FM Receiver FM Receiver (863 MHz)
  • Page 51 The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-400-863 is specifi ed. Specifi cations LR-400-863 RF Frequency Range 863.050 - 864.950 MHz Number of Channels 17 Wideband Sensitivity .6 uV typical, 1 uV maximum for 12 dB sinad Frequency Accuracy ±...
  • Page 52 NiMH batteries. The Listen LR-500-863 is specifi ed. Specifi cations LR-500-863 RF Frequency Range 863.050 - 864.950 MHz Number of Channels 17 Wideband Sensitivity .6uV typical, 1 uV maximum for 12 dB sinad Frequency Accuracy ±...

  • Page 53: Block Diagram

    LR-400/500 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 Companding de-emphasis de-modulation Q-Technology VOLUME 3.5 mm Connector Sleeve Ring...

  • Page 54: Quick Reference

    LR-400-863 Quick Reference 3.5 mm Output Jack: Connect a listen earpiece here. Articulating Flexible Antenna LED: When lit, indicates unit has power. On/Off and Volume Control Dial. Look&Listen™ Display: Shows receive level, channel, battery status, and lock status. Power/Charging Port SEEK Button: Allows the user to change channels or lock on a channel.
  • Page 55 LR-500-863 Quick Reference 3.5 mm Output Jack: Connect a listen earpiece here. LED: When lit, indicates unit has power. On/Off and Volume Control Dial. Articulating Flexible Antenna Look&Listen™ Display: Shows receive level, channel, programming, battery status, and lock status. Power/Charging Por SEEK Button: Allows the user to change channels or lock on a channel.

  • Page 56: Setup Instructions

    LR-400/500 Setup Instructions 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 67 for contact information). Open the front access door If locked, use a pocketknife or small screwdriver to unlock the door locks on both sides of the unit.
  • Page 57 LR-400/500 Setup Instructions Place Batteries in Unit Place two AA batteries in the compartment, 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 58 LR-400/500 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 and the LCD display should illuminate. If they do not, make sure you have installed the batter- ies correctly and that you are using fully charged batteries.

  • Page 59: Operating Instructions

    LR-400/500 Operating Instructions Turn Unit On Volume knob Rotate the volume knob counterclockwise with an earphone or headset connected to the unit. WARNING: Excessive volume may result in hearing damage. Antenna Placement Antenna Position Raise the antenna to the upright position. When the antenna if fully extended, it will click into position.
  • Page 60 LR-400/500 Operating Instructions Select the channel using SEEK Another way to fi nd a channel on the LR-400/500 is to use the SEEK button. When you do this, the Listen receiver looks for the next active channel. Sometimes the unit will mistake interference for a real broadcast signal. If you get interference, press the SEEK button again.
  • Page 61 LR-400/500 Operating Instructions Locking the Receiver on One Channel The unit can be electronically locked on one channel so that it will not change channels even if the “SEEK” button is pressed. It is recommended to lock the receiver on a channel that is being used in a single channel system or when mul- tiple systems are in the same area.
  • Page 62 LR-400/500 Operating Instructions Squelch Programming Entering Squelch Program Mode Turn unit off Press and hold the SEEK button; while holding SEEK button down, turn the ON/OFF/VOLUME dial to turn the unit on. Release the SEEK button when the Listen name disappears (approximately 2 seconds) and a two digit display is seen.
  • Page 63 LR-400/500 Operating Instructions Squelch The purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone.
  • Page 64 LR-400/500 Operating Instructions DX/Local DX is the normal operational mode. Local mode can effectively limit any inter-modulation and/or interference in a busy RF environment. This is done by limiting the amount of RF gain in the receiver. When local mode is selected, the range of the receiver is compromised. Depending on your application and environment, Local mode may be necessary for better performance.

  • Page 65: Programming Instructions (Lr-500 Only)

    LR-500 Programming Instructions (LR-500 only) Programming Instructions The LR-500 can be programmed to receive on a limited number of channels. When an application requires the use of more than one channel (i.e. a classroom or language interpretation), the receiver can be programmed to view only the necessary channels. Entering Program Mode To enter program mode While the unit is ON, press and hold the channel down and up buttons simultaneously for 3 seconds.

  • Page 66: Accessories

    Accessories for LR-400/500 Accessories LA-166 LA-164 LA-165 Neck Loop Ear Speaker Stereo Headphones (01) (02) (03) LA-304 LA-208 LA-170 Behind-the-Head Assistive Listening 7.5 VDC Power/Charging Notifi cation Signage Kit Stereo Headphones Supply for FM Portable Products LA-208-01 North America LA-208-02 Asia/UK LA-208-03 Euro LA-311 16-Unit Portable Charging/Carrying Case LA-361...

  • Page 67: Notes

    Notes...
  • Page 68 Notes...
  • Page 73 Supplementary Information Table of Contents Battery Charging Information Frequency Chart Troubleshooting Frequently Asked Questions Compliance, Warranty and Contact Information Notes...

  • Page 75: Battery Charging Information

    Battery Charging Information The Listen receivers are unique because they have SmartCharge™ chargers built in. When any of these units are connected to an LA-208 wall transformer or dropped into a Listen charging case, NiMH batteries will be charged. SmartCharge™ uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH) batteries. The entire charging process takes about 13 hours.

  • Page 76: Frequency Chart

    Frequency Chart Frequencies...

  • Page 77: Troubleshooting

    Troubleshooting Troubleshooting The LT-800 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 POWER button is pressed in. There is no audio or the audio level is too low. 1.

  • Page 78: Troubleshooting

    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...

  • Page 79: Frequently Asked Questions

    Frequently Asked Questions Frequently Asked Questions Does the LT-800 include the rack mount? No, but the LA-326 Universal Rack Mount Kit may be ordered to compliment the LT-800. Do I need a transmitter for each audio source? No, Each Transmitter can mix two different input sources. What is the range of the LT-800-863 Transmitter? Line of site 122 m (400 ft).
  • Page 80 Frequently Asked Questions Frequently Asked Questions Can the receiver be “locked” on a channel if I need that? Yes. All Listen receivers can be locked. What is the battery life of a receiver? 20 hours using alkaline batteries. 10 hours using NiMH batteries.

  • Page 81: Compliance, 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 82: Notes

    Notes...
  • Page 84 Listen Technologies Corporation 14912 Heritagecrest Way 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 Printed in the United States of America ©...

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863.200863.400863.500Stationary fm 863 mhz

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