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Listen Portable fm 863 Mhz Manual Manual

Portable fm system
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  • Page 3 Should you experience any problems whatsoever with your Listen products, we are ready to help you in any way we can with prompt, efficient customer care. Because at Listen, it’s all about you! And should you have any comments on how we might improve our products or our service, we’re here to listen.

  • Page 5: Table Of Contents

    Portable FM Table of Contents Design Guide FM Technology Overview System Overview Key Concepts in Designing an FM System Notes LT-700 Portable FM Transmitter Specifications Block Diagram Quick Reference Setup Instructions Operating Instructions Programming Instructions Accessories Notes LR-400/500 FM Receivers Specifications Block Diagram Quick Reference...
  • Page 9 Portable FM Design Guide Table of Contents FM Technology Overview System Overview Key Concepts in Designing an FM System Notes...

  • Page 11: Fm 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, floors, 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 three main parts to a Portable FM System – Input source, transmitter, and receiver. LA-278 Behind-the-Head Microphone LR-500 LT-700 LR-400 Portable Programmable Portable Display FM Portable Display FM Display FM Receiver (863 MHz) Transmitter (863 MHz) Receiver (863 MHz) Input Source A microphone is the most common input source for the LT-700 transmitter, although, the LT-700 can transmit two...
  • Page 13 The LT-700 modulates the audio on an FM carrier and transmits the signal via an antenna on the unit. LT-700 Portable Display FM Transmitter (863 MHz) Receivers Listen offers two different portable receivers. LR-400 LR-500 Portable Display FM Portable Programmable Receiver (863 MHz)

  • Page 14: Key Concepts In Designing An Fm System

    • Listen products offer 17 different channels to choose from. This increases the chance you’ll find an interference free channel. • The best way to check for interference is to use the “SEEK” button on the receiver. Be sure all Listen transmitters have been turned off if there is interference, the receiver will find these channels.

  • Page 15: Transmitter Power Level

    The lower the power setting, the less range the transmitter will broadcast. Decreasing the broadcast range will keep the receivers closer to the transmitter. Spacing of channels Use a Listen frequency chart (on page 61) to determine the channels frequency and space the number of channels further from each other. DX/Local...

  • Page 16: Notes

    Notes...
  • Page 17 Notes...

  • Page 21: Specifications

    LT-700 User’s Manual Table of Contents Specifications Block Diagram Quick Reference Setup Instructions Operating Instructions Programming Instructions Accessories Notes LT-700 Package Contents • LT-700 • Quick Reference Card LT-700 Portable Display FM Transmitter (863 MHz) Listen Configurations • LT-700-863...
  • Page 23 The device shall incorporate an LCD display that indicates battery level, channel, channel lock, low battery, battery charging, programming, and RF signal strength. The portable transmitter shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LT-700-863 is specified. Specifications...
  • Page 24 LT-700 Block Diagram LCD Display Down Power Supply CPU Module Power Universal 115/230VAC Power charge indicator Power Supply 50/60 Hz Red LED (not included) NiMH Alkaline (2) AA Batteries ALkaline or NiMH ANTENNA Companding RF Modulation Pre-emphasis Q-Technology 3.5 mm Connector Sleeve Ring...
  • Page 25 LT-700 Quick Reference 3.5mm Input Jack: Connect microphone or line input here. LED: When lit, indicates unit has power, when flashing unit is muted/charging Mute On/Off switch Look&Listen™ Display: Shows transmit level, channel, programming, battery status, and lock status. Articulating Flexible Antenna...
  • Page 26 Unpack 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 66 for contact information).
  • Page 27 The microphone sensitivity switch is located inside the battery compartment, to the left of the BATTERY selection switch. The LT-700 is shipped with this switch in the center (MED) position. Listen recommends the following settings for our microphones. If you are using a microphone from another vendor, you may need to experiment with different settings.
  • Page 28 This cable allows you to connect a TV, CD player or other equipment to the LT-700. To do this, you must order the Listen LA-263 Line Input Cable (not included with your unit). This cable allows you to connect both a microphone and line input to the jack on top of the LT-700. See the diagram below for connection information.
  • Page 29 LT-700 Operating instructions Turn Unit On Power On/Off Button When you press the power button, the LED on top of the unit will be illuminated and the LCD display will be visible. Antenna Positioning Raise the antenna to the upright position. When the antenna if fully upright, it will click into position.
  • Page 30 LT-700 Operating instructions Using the MUTE / TALK switch Slide the switch to the mute position and the microphone audio is muted. When the microphone audio is muted, the LED on top of the unit flashes rapidly. Slide the switch back to the talk position and the microphone audio will return to the transmission.
  • Page 31 LT-700 Programming instructions Program Mode Overview The LT-700 can be programmed to transmit on a limited number of channels. For applications where users are required to select a channel (such as classrooms or language interpretation application), and you don’t want them to have to scroll through all of the available channels, this feature is ideal.
  • Page 32 LT-700 Programming instructions Once in the program mode, a function menu is displayed. Function 1 (F1) is displayed as default. Pressing the channel up or down buttons will scroll through the functions. Pressing the power button will enter that function. F1- Channel Lock out.
  • Page 33 LT-700 Programming instructions Reseting to defaults To reset the receiver to default settings, follow these instructions: Reset to default settings Press and hold the Up and Down channel buttons while turning the unit on. Press and hold the Up and Down channel buttons while turning the unit on. This will light up all segments of the display.

  • Page 34: Accessories

    Accessories for LT-700 Accessories LA-261 LA-278 Lavalier Microphone Behind-the-Head Microphone LA-311 16-Unit Portable Charging/Carrying Case• LA-313 16-Unit LA-280 Portable Carrying Case LA-317 4-Unit Portable Charging/Carrying Case LA-318 4-Unit Portable Carrying Case LA-320 Configurable Carrying Case LA-321 8-Unit Portable Charging/Carrying Case LA-322 8-Unit Portable Carrying Case LA-323...

  • Page 35: Notes

    Notes...
  • Page 36 Notes...

  • Page 41: Block Diagram

    Setup Instructions Operating Instructions Programming Instructions (LR-500 only) Accessories Notes LR-400/500 Package Contents • LR-400/500 • Quick Reference card LR-500 LR-400 Portable Programmable Portable Display Display FM Receiver FM Receiver (863 MHz) (863 MHz) Listen Configurations • LR-400-863 • LR-500-863...
  • Page 43 The receiver shall be able to function in both DX and Local mode. The unit shall operate off of 2 AA batteries. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-400-863 is specified. Specifications...
  • Page 44 DX and Local mode. The unit shall operate off of 2 AA batteries. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-500-863 is specified. Specifications LR-500-863 RF Frequency Range 863.050 - 864.950 MHz...
  • Page 45 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) NiMH Alkaline (2) AA Batteries ALkaline or NiMH POWER ANTENNA Companding RF Modulation Pre-emphasis Q-Technology VOLUME 3.5 mm Connector Sleeve Ring...
  • Page 46 LR-400 Quick Reference 3.5mm Input Jack: Connect a listen earpeice here. LED: When lit, indicates unit has power. On/Off and Volume Control Dial. Look&Listen™ Display: Shows receive level,channel, programming, battery status, and lock status. Articulating Flexible Antenna Power/ Seek button: Allows the user to...
  • Page 47 LR-500 Quick Reference 3.5mm Input Jack: Connect a listen earpeice here. LED: When lit, indicates unit has power. On/Off and Volume Control Dial. Look&Listen™ Display: Shows receive level,channel, programming, battery status, and lock status. Articulating Flexible Antenna Power/ Seek button: Allows the user to...
  • Page 48 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 66 for contact information).
  • Page 49 Connect an Earphone or Headset Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo connectors may be used with a Listen receiver. Make certain you push the plug all the way into the jack.
  • Page 50 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 should activate and the LCD display should illuminate. If they do not, make sure you have installed the batteries correctly and that you are using fully charged batteries.
  • Page 51 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 52 Another way to find 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 53 NOTE: On the LR-400/500, when the channel is locked, a lock icon will appear underneath “Listen” on the display. Also if the unit is locked, the red LED on top of the receiver will flash when the SEEK button is pressed.

  • Page 54: Adjusting The Squelch Level

    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 55 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 56 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 enviorment. 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 57 LR-500 Programming instructions (LR-500 only) Program Mode Overview The LR-500 is a programmable receiver. In applications where users are required to select a channel (such as language interpretation or classrooms), it may not be necessary for the receiver to search 17 channels looking for the appropriate channel. The LR-500 can lockout unused channels so the user can toggle only between occupied frequencies Entering Program Mode To enter program mode...
  • Page 58 Accessories for LR-400/500 Accessories LA-163 LA-162 Replacement Cushions for Stereo Ear Buds LA-161 Ear Buds (20) Single Ear Bud LA-164 LA-165 Ear Speaker Stereo Headphones LA-166 Neck Loop LA-311 16-Unit Portable Charging/Carrying Case LA-313 16-Unit Portable Carrying Case LA-317 4-Unit Portable Charging/Carrying Case LA-318 4-Unit Portable Carrying Case LA-170...
  • Page 59 Notes...
  • Page 60 Notes...
  • Page 65 Supplementary information Table of Contents Frequency Chart Battery Charging Information Troubleshooting Frequently Asked Questions Compliance, Warranty and Contact Information Notes...

  • Page 67: Frequency Chart

    Frequency Chart Frequencies...

  • Page 68: Battery Charging Information

    13 hours. Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life. During the charge cycle, the red LED on top of the Listen product will flash slowly. When charging is completed, the LED will turn off. It is not necessary to unplug the charger;...

  • Page 69: Troubleshooting

    Make sure the MUTE/TALK switch is in the TALK position. Make sure you have the microphone plugged all the way in to the input jack. Make sure you are using a Listen approved microphone (see list on page 21). If you are using the line input, make sure you have connected a line level, unbalanced input at the “ring”...

  • Page 70: Troubleshooting

    NiMH position. Make sure the batteries are installed correctly. Make sure you are using the right kind of wall transformer (Listen part number LA-208) or charging case. Make sure the charging case is connected to power and the unit is securely pushed into its slot in the case.

  • Page 71: Frequently Asked Questions

    Is there a limit to the number of transmitters I can use in one room? Yes. Listen recommends that no more that 8 channels are in used simultaneously (refer to page 15 on using multiple channels in the same room).
  • Page 72 Frequently Asked Questions Can the receiver be “locked” on a channel if needed? Yes. All Listen receivers can be locked on a single channel. What is the battery life of a receiver? 20 hours using alkaline batteries. 12 hours using NiMH batteries.

  • Page 73: Compliance, Warranty And Contact Information

    Utah. In the first ninety days after purchase, any defective product will be replaced with a new unit. After 90 days, Listen will, at its own discretion either repair or replace transmitters and receivers with a new unit or a unit of similar type and condition.

  • Page 74: Notes

    Notes...
  • Page 76 Listen Technologies Corporation 14912 Heritagecrest Way Salt Lake City, Utah 84065-4818, U.S.A. 801.233.8992 800.330.0891 North America 801.233.8995 www.listentech.com Printed in the United States of America © 2007 Listen Technologies Corporation All Rights Reserved 2007511 ®...

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