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Listen Technologies Portable FM 863 MHz Design Manual

Portable display fm transmitter
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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 info@listentech.de Thank you and enjoy your listening experience!

  • 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-700-863 Portable FM Transmitter Specifi cations Block Diagram Quick Reference Setup Instructions Operating Instructions Programming Instructions Accessories Notes LR-400/500-863 FM Receivers Specifi...
  • Page 8 Portable FM Design Guide Table of Contents FM Technology Overview System Overview Key Concepts in Designing an FM System Notes...

  • Page 10: Fm Technology Overview

    Frequency Modulation (FM) Technology Overview Frequency modulation (FM) is a means of transmitting audio using electromagnetic waves. This same technology is used by local FM radio stations to broadcast voice and 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 11: 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-500-863 LT-700-863 LR-400-863 (other microphones available) Portable Programmable Portable Display FM Portable Display FM Display FM Receiver (863 MHz) Transmitter (863 MHz) Receiver (863 MHz) Input Source...
  • Page 12 System Overview Transmitter The LT-700 modulates the audio on an FM carrier and transmits the signal via an anten- na on the unit. LT-700-863 Portable Display FM Transmitter (863 MHz) Receivers Listen offers two different portable receivers. LR-400-863 LR-500-863 Portable Display FM Portable Programmable Receiver (863 MHz) Display FM Receiver (863 MHz)

  • Page 13: Key Concepts In Designing An Fm System

    Key concepts in designing a portable FM system Channel Selection Use this section of the guide to choose the channel settings for the transmitter and receivers. • The goal is to fi nd a transmission channel(s) that is free from interference. Interference originates from other transmitters and from other equipment (such as a computer).
  • Page 14 Key concepts in designing a portable FM system Eliminating Multipath As mentioned on page 5, multipath can occur with portable RF systems. The audio quality of the transmission can decrease with the occurrence of multipath. Here are a few potential improvements that can help if multipath takes place: Squelch Squelching the receiver will mute the audio output when the signal from the transmitter is turned off or...

  • Page 15: Notes

    Notes...
  • Page 16 Notes...

  • Page 19: Specifi Cations

    LT-700 User’s Manual Table of Contents Specifi cations Block Diagram Quick Reference Setup Instructions Operating Instructions Programming Instructions Accessories Notes LT-700 Package Contents • LT-700-863 • Quick Reference Card • Warranty Card • FM Manual Card LT-700-863 Portable Display FM Transmitter (863 MHz) Listen Confi...
  • Page 21 LT-700-863 Specifi cations Architectural Specifi cation The LT-700-863 portable FM Transmitter shall be capable of broadcasting on 17 channels. Channel tuning shall be capable of being locked. The transmitter shall have a SNR of 70 db or greater. The output power shall be adjustable to quarter, half or full. The device shall have an audio frequency response of 50 Hz to 15 kHz, +/-3 dB.
  • Page 22 LT-700 Block Diagram LCD Display Down Power Supply CPU Module Power Universal 7.5 VDC 115/230VAC Power Supply 50/60 Hz Power charge indicator (not included) Red LED Alkaline NiMH (2) AA Batteries ALkaline or NiMH ANTENNA Companding RF Modulation Pre-emphasis Q-Technology 3 VDC Sleeve Line...
  • Page 23 LT-700 Quick Reference 3.5mm Input Jack: Connect a Listen microphone here. LED: When lit, indicates unit has power, when fl ashing unit is muted/charging. Mute On/Off switch Articulating Flexible Antenna Look&Listen™ Display: Shows transmit level, channel, programming, battery status, and lock status.
  • Page 24 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 67 for contact information).
  • Page 25 LT-700 Setup Instructions Set Mic Sensitivity Switch 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 26 LT-700 Setup Instructions Connect the Microphone The microphone jack is located on top of the unit. Connect the Line Input Cable (Optional) 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).

  • Page 27: Lt-700 Operating Instructions

    LT-700 Operating Instructions Turn Unit On Power On/Off Button When you press the power button, the unit turns on. 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 e upright position.
  • Page 28 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 fl ashes rapidly. Slide the switch back to the talk position and the microphone audio will return to the transmission.
  • Page 29 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 30 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 31 LT-700 Programming Instructions Resetting to defaults To reset the transmitter 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 32 Accessories for LT-700 Accessories LA-262 LA-272 LA-261 Over-the-Head Microphone Over-the-Head Microphone Lavalier Microphone w/Earphone LA-274 LA-276 LA-277 Hand Held Microphone Collar Microphone Conference Microphone LA-278 LA-304 LA-361 High Capacity AA Alkaline Behind-the-Head Assistive Listening Batteries (2) Microphone Notifi cation Signage Kit LA-362 LA-311 16-Unit Portable Charging/Carrying Case Rechargeable AA NiMH...
  • Page 33 Notes...
  • Page 34 Notes...

  • Page 38: Programming Instructions

    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 40 LR-400-863 Specifi cations Architectural Specifi cation The LR-400-863 FM receiver shall be capable of receiving on 17 wide band channels with a SNR of 70 dB or greater. The device shall be able to be locked on a single channel. The receiver shall be capble of seeking channels.
  • Page 41 LR-500-863 Specifi cations Architectural Specifi cation The LR-500-863 FM receiver shall be capable of receiving on 17 wide band channels with a SNR of 70 dB or greater. The receiver shall be programmable to electronically lock out unneeded channels. The receiver shall be capable of seeking channels. The device shall be able to be locked on a single channel.
  • Page 42 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 43 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 44 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 45 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 Corpora- tion technical support for assistance (refer to page 67 for contact information).
  • Page 46 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 47 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 48 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 49 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 50 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 51 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 52 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 53 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 54: 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 55 Accessories for LR-400/500 Accessories LA-166 LA-164 LA-165 Neck Loop Ear Speaker Stereo Headphones LA-304 LA-361 LA-170 -170 High Capacity AA Alkaline Behind-the-Head Behind-the-Head Assistive Listening Batteries (2) Stereo Headphones Stereo Headphones Notifi cation Signage Kit LA-362 Rechargeable AA NiMH Batteries (2) LA-311 16-Unit Portable Charging/Carrying Case LA-313 16-Unit Portable Carrying Case LA-317 4-Unit Portable Charging/Carrying Case...
  • Page 56 Notes...
  • Page 57 Notes...
  • Page 62 Supplementary Information Table of Contents Frequency Chart Battery Charging Information Troubleshooting Frequently Asked Questions Compliance, Warranty and Contact Information Notes...

  • Page 64: Frequency Chart

    Frequency Chart Frequencies...

  • Page 65: Battery Charging Information

    Battery Charging Information The LT-700 and LR-400/500 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. 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 66: Troubleshooting

    Troubleshooting Troubleshooting The unit has no power. Make sure the unit has fully charged batteries. Press the POWER button. If this does not work, try a different set of batteries. Make sure the batteries are installed correctly. There is no audio. Make sure the MUTE/TALK switch is in the TALK position.

  • Page 67: Troubleshooting

    Troubleshooting Troubleshooting My batteries are not charging Make sure you are using NiMH batteries and that the BATTERY SELECT switch (inside the battery compartment) is set to the NiMH position. Make sure the batteries are installed correctly. Make sure you are using a Listen charging case. Make sure the charging case is connected to power and the unit is securely pushed into its slot in the case.

  • Page 68: Frequently Asked Questions

    Frequently Asked Questions Frequently Asked Questions Do I need a transmitter for each audio source? Yes. To transmit two different frequencies, there must be two separate transmitters. What is the range of the LT-700 Transmitter? The range of the LT-700 will depend upon the power setting and interference (refer to page 8). Generally the range is up to 61 m (200 ft.).
  • Page 69 Frequently Asked Questions 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. 10 hours using NiMH batteries.

  • Page 70: 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 71: Notes

    Notes...
  • Page 73 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 Printed in the United States of America © 2011 Listen Technologies Corporation All Rights Reserved 201109.28 ®...

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