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Listen LT-800 Design Manual & Manual

Stationary fm 863 mhz system, portable programmable display fm receiver 863 mhz
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Summary of Contents for Listen LT-800

  • Page 3 Listen products, we are ready to help you in any way we can with prompt, have any comments on how we might improve our products or our +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...

  • Page 5: Table Of Contents

    Stationary FM Table of Contents Design Guide FM Technology Overview System Overview Notes Quick Reference Accessories Notes Quick Reference Accessories Notes Frequency Chart Troubleshooting Frequently Asked Questions Notes...
  • Page 9 Stationary FM Design Guide Table of Contents Table of Contents Technology Overview System Overview Notes...

  • Page 11: Fm Technology Overview

    Frequency Modulation (FM) Technology Overview This same technology is used by local FM radio stations to broadcast music. FM signals can travel through frequency. Unlike infrared, FM transmission are not secure. This enables a receiver to travel further distances from the source. This section of the manual will help you design a system that will get the best range and least amount of interference.

  • Page 12: System Overview

    System Overview There are four main parts to a Stationary FM system – transmitter, antenna, receiver and input source, . Input Source The input source can be audio from a sound board, microphone or a personal audio source like a CD player, MP3 player, computer, DVD, etc.
  • Page 13 System Overview Antenna unit or remote mounted. Receivers Portable Display FM Portable Programmable Display FM Receiver...

  • Page 14: Input Selection

    Key Concepts in Designing a Stationary FM System Input Selection Input 1: Connect the audio source(s) 1/4”Phone Wiring XLR Wiring Balanced Sleeve Input from Top Ring Balanced Unbalanced Audio Audio Source Source Balanced Audio Source Unbalanced right and left phono connectors Unbalanced Ring...
  • Page 15 Key Concepts in Designing a Stationary FM System Input 2: Connect the audio source(s) match the audio level coming from your equipment. Using Two inputs When two inputs are present, both sets of input level lights will be activated. Mix Level Mix level adjustment...
  • 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) Listen’s LT-800-863 offers 17 different channels to choose from these channels. Testing System Monitor Jack The headphone jack is used to monitor the mix of input 1 &...
  • Page 17 Key Concepts in Designing a Stationary FM System Antenna placement (rear or remote) Rear mounted antenna will allow the transmitter to be moved if necessary. Remote antenna ATTENTION: Long cable runs can result in signal degradation due to the “loss” characteristics of the cable.
  • Page 18 Key Concepts in Designing a Stationary FM System Front of the rack mounted antenna Maximizing Transmission Range For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the Transmitting and receiving antennas When designing and installing your system, keep in mind that the location of both the transmitting and Move transmitting and receiving antennas away from metal or conductive objects.
  • Page 19 Key Concepts in Designing a Stationary FM System Orientation Orient both transmitting and receiving antennas vertically. RF Power switch RF Power Switch Cable Length...
  • Page 20 Mounting Transmitter can mount one or two transmitters to the standard 19” rack. The rack mounted unit will take 1 ru of space. NOTE: The antenna may need to be remote mounted using the LA-130 Remote Antenna Kit if the transmitter(s) is rack mounted.
  • Page 21 A museum patron walks to an exhibit and needs to listen to one channel at a time. transmitters operating in this scenario. However, to reduce the possibility of the receiver accidentally receiving • Get the transmitting antenna as close to the receivers as possible.
  • 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. used within the room.

  • Page 23: Notes

    Notes...
  • Page 24 Notes...

  • Page 29: Quick Reference

    LT-800 User’s Manual Table of Contents Quick Reference Accessories Notes LT-800-863 Package Contents • Quick Reference Sticker • 12 VDC Power Supply • Line Cord • Quick Reference Card • Warranty Card • Manual Card 12 VDC Power Supply...
  • Page 31 2.7 lbs (1.10 kg) 3 lbs. 2oz. (1.42 kg) One rack space height, 1/2 rack space wide. One or two transmitters can be mounted in one rack space. Optional Rack mount (LA-326) and LA-131 antenna kit for rack mount not included.
  • Page 32 LT-800-863 Block Diagram 115/230VAC Universial Power 50/60 Hz Supply (provided) ANTENNA Functions controlled by the CPU Module Input 1 VU Meter 12VDC Phantom Pwr 2/Tip 3/Ring INPUT 1 POWER 12VDC, 1.3A Power Supply CPU Module Display Backlit MIX Level VU Meter...

  • Page 33: Quick Reference

    LT-800-863 Quick Reference Adjust audio input tone to aid system setup. Low, med or high RF power. RF Antenna connector for is outputting RF. in program mode. locked on current channel. mode is active. Plug in a headset to monitor audio.
  • Page 34 Unpack the Product Remove outer packaging and plastic cover. Verify all components are present and no physi cal damage has occurred to the product. Mount LT-800(s) in Rack (if desired) instructions included with the kit. Rack Mount with single unit installed.
  • Page 35 LT-800 Setup Instructions Set RF power interference. Low, med or high RF power Connect Audio Inputs connect to an unbalanced audio source. Input 1 XLR Wiring 1/4” Phone Wiring Balanced Unbalanced Ring Sleeve Sleeve Input from Top Ring Top Ring/Sleeve...
  • Page 36 LT-800 Operating Instructions Power Unit On Select a Channel Select the transmit channel by pressing the 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) transmitting properly. All receivers should be able to hear this tone if tuned to the proper channel. Adjusting Audio Levels Adjust Audio Input Level meter, then adjust the output level of the other audio source. Adjust the input level until the left...
  • 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. Adjust Mix Level Adjust the mix level until the right VU meter occasionally illuminates the...
  • Page 39 LT-800 Operating Instructions Process Mode 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. Typically you would conveying.
  • Page 40 Accessories for LT-800-863 Accessories Assistive Listening Supply for FM Portable Products...
  • Page 41 Notes...
  • Page 42 Notes...
  • Page 43 Notes...
  • Page 44 Notes...

  • Page 49: Accessories Notes

    LR-400/500 User’s Manual Table of Contents Quick Reference Accessories Notes LR-400/500 Package Contents • Quick Reference Card • Warranty Card Portable Display FM Receiver Portable Programmable Display FM Receiver...
  • Page 51 capable of seeking channels. The device shall have an adjustable squelch. The device shall have an that allows the user to plug in either a mono or stereo headset. The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, and RF signal strength. The receiver shall be able to function in both DX and Local mode.
  • Page 52 The receiver shall be capable of seeking channels. The device shall be able to be locked on a single channel. The device shall have an adjustable squelch. The device shall have an audio frequency user to plug in either a mono or stereo headset. The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, and RF signal strength.
  • Page 53 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 LR-400-863 Quick Reference Articulating Flexible Antenna Front Door Lock level. locked on current channel. receive level, channel, battery status, and lock status. user to change channels or lock on a channel. the type of batteries being used. pattern.
  • Page 55 LR-500-863 Quick Reference Articulating Flexible Antenna Front Door Loc RF receive level Program function is in process. locked on current channel been locked out. Shows receive level, channel, programming, battery status, and lock status. user to change channels or lock on a channel. the type of batteries being pattern.
  • Page 56 LR-400/500 Setup Instructions Remove the product please contact the dealer from which the product was purchased or Listen Technologies Corpora Open the front access door the unit. To unlock the door, rotate the lock ¼ turn counterclockwise. Grip the two tabs with unit at this time.
  • 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 NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high performance AA Nickel Metal Hydride batteries (part number LA-362). These may be purchased from your Listen dealer.
  • 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 ies correctly and that you are using fully charged batteries.
  • Page 59 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 When you do this, the Listen receiver looks for the next active channel. channel that is close to the actual broadcast channel, in which case the clearest operating channel. Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level.
  • Page 61 LR-400/500 Operating Instructions Locking the Receiver on One Channel tiple systems are in the same area. To lock on a channel Press and hold the SEEK button for 5 seconds channel. Press and hold the button again to unlock. When locked the LED on top of NOTE: On the LR-400/500, when the channel is locked, a lock icon will appear underneath when the SEEK button is pressed.
  • Page 62 LR-400/500 Operating Instructions Squelch Programming Entering Squelch Program Mode Turn unit off the unit on. display is seen. Adjusting the Squelch level page 49 for settings. Lower numbers mean that a less powerful and possibly noisy signal will be heard, but you can have a longer range before the unit will squelch.
  • Page 63 The squelch on your receiver can be adjusted so that it will mute the audio on Set the squelch setting to the highest level transmitters, set the squelch setting to the highest level that If the receiver is close to the transmitter, set the squelch high transmitter is turned off it immediately squelches and ignores transmitters in other rooms.
  • Page 64 LR-400/500 Operating Instructions DX/Local 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. DX mode is default. DX Mode (default) DX is normal operation.

  • Page 65: Programming Instructions

    LR-500 Programming Instructions (LR-500 only) Programming Instructions 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. The “PGM” icon on the LCD will appear indicating program mode is active. To program Pressing the seek button will enter that particular function.
  • Page 66 Accessories for LR-400/500 Accessories Neck Loop Ear Speaker Stereo Headphones High Capacity AA Alkaline Assistive Listening Stereo Headphones Rechargeable AA NiMH...

  • Page 67: Notes

    Notes...
  • Page 68 Notes...

  • Page 73: Frequency Chart Troubleshooting Frequently Asked Questions

    Supplementary Information Table of Contents Frequency Chart Troubleshooting Frequently Asked Questions Notes...
  • Page 75 Battery Charging Information The Listen receivers are unique because they have SmartCharge™ chargers built in. When any of these units are placed into a Listen charging case, NiMH batteries will be charged. takes about 13 hours. Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life. When not using the receiver, it is recommended to leave the unit on the charger.
  • Page 76 Frequency Chart Frequencies...
  • Page 77 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 There is no audio or the audio level is too low. the input level of the audio source. You can listen to the audio source by connecting a headset to the front panel jack and adjusting the Monitor volume control.
  • Page 78 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 troubleshooting the interference.
  • Page 79 Frequently Asked Questions No, Each Transmitter can mix two different input sources. Up to eight can be used simultaneously. can be set to just those channels you need. 1 to 17. The receiver has 17 channels and you can program it to have just the channels you want As many as you need, the number is endless.
  • Page 80 Frequently Asked Questions Yes. All Listen receivers can be locked. 20 hours using alkaline batteries. 10 hours using NiMH batteries. Frequently Asked Questions...
  • Page 81 Utah. will, at its own discretion either repair or replace transmitters and receivers with a new unit or a unit of similar type and condition. Product that is not covered under warranty shall be repaired or replaced with a unit of similar type damaged in shipment, please contact the carrier, then contact Listen for replacement or repair requirements payable by the carrier.

  • Page 82: Notes

    Notes...
  • Page 84 Listen Technologies Corporation 14912 Heritagecrest Way +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 +49 911 955159 40 www.listentech.de info@listentech.de Printed in the United States of America © 2008 Listen Technologies Corporation ®...

This manual is also suitable for:

Lr-400Lr-500Lt-800-863Lr-400-863Lr-500-863