Stationary IR Transmitter
LT-82

Highlights

  • Secure wireless communication - ideal for applications where isolation of the signal is important
  • Up to four (4) channels mono, or four (4) channels stereo – no need to sacrifice multiple channels to achieve stereo transmissions (one LT-82 is required for each channel)
  • Transmitter can power two (2) radiator/emitters (LA-140) using CAT-5 cabling
  • Easy to specify, install and use
  • Outstanding performance - ensures crystal clear sound for listeners
  • Limited Lifetime Warranty

Overview

The Listen LT-82 is the heart of a stationary IR listening system. It takes the desired audio signal and transmits the signal via coaxial cable to one (1) or more IR radiator-emitters (LA-140). The LT-82 can be operated in mono or stereo on one (1) of four (4) different carriers; up to four (4) LT-82 units may be connected to provide up to four (4) mono or stereo carriers to the radiator(s). The LT-82 generates DC power to power up to two (2) LA-140 radiator-emitters. Two (2) LT-82 units can be rack mounted in a single rack space using the LA-326 rack mounting kit. The LT-82 is used for government compliance (such as ADA), assistive listening, language interpretation, live theatre, houses of worship, courtrooms, secure rooms and for auditory description.

Includes

LT-82 Stationary IR Transmitter
LA-205 30 VDC Extension/Replacement Power Supply for LA-140/LT-82
LA-89 Interconnection Coaxial Cable
Quick Reference Card

Configurations

LT-82-01 Stationary IR Transmitter (North America)
LT-82-02 Stationary IR Transmitter (Asia, UK)
LT-82-03 Stationary IR Transmitter (Euro)

Architectural Specs

The Stationary IR Transmitter shall be capable of broadcasting on four (4) mono or stereo carriers; 2.3, 2.8, 3.3 and 3.8 MHz. Channel Selection shall be capable of being locked. Multiple transmitters shall be capable of being daisy-chained together to transmit up to four (4) channels simultaneously. The transmitter shall have a timer that shuts off the carriers after 30 minutes when no audio is present at the transmitter. The transmitter shall have a SNR of 60 db or better. The device shall have an audio frequency response of 63 Hz to 15 kHz, +/- 3db. It shall have two (2) mixing audio inputs, one (1) balanced XLR/phone input and one (1) unbalanced RCA input. The device shall have the following audio controls: input level, transmit level, contour level and stereo on/off control. The device shall have an audio processor that is capable of automatic gain control and limiting. The transmitter shall provide power for up to two (2) radiators over CAT-5 cable. The LT-82 is specified.

CAD Drawing

    • Specifications

    SpecificationsLT-82
    RFCarrier Frequencies2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz
    Number of ChannelsFour (4) channels. Selectable one (1) channel per transmitter (mono or stereo)
    Carrier Shut OffCarrier will shut off when no audio is present for 30 minutes to preserve radiator life.
    Frequency Accuracy+/- .005% stability 0 to 50 °C
    Transmitter Stability50 PPM
    RF OutputTwo (2) BNC connectors, for connection to radiator(s) and/or additional transmitter(s). 50 mV, 50 ohm, -15 dBm
    RF InputOne (1) BNC connector, for connection from additional transmitter(s). 50 mV, 50 ohm, -15 dBm
    ComplianceFCC Part 15, Industry Canada, CE, RoHS
       
    Audio** All system specifications are wireless end-to-end 
    System Frequency Response63 Hz - 15 kHz (+/- 3 dB)
    System Signal to Noise Ratio (A-weighted)Mono: >60 dB
    Stereo: >52 dB
    System Distortion<2% total harmonic distortion (THD)
    Audio Input 1Mono Input (Rear Panel). Female-XLR and 1/4 in. combo connector, balanced, 0/-55 dBu (line/mic) nominal input level adjustable; +21/-30 dBu (line/mic) maximum input level; impedance 20k/1k ohms (line/mic); phantom power +12 VDC
    Audio Input 2Stereo or Mono Input (Rear Panel). Two (2) Phono connectors, unbalanced, -10/+10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohms
    Audio ProcessingCompression can be turned on/off. 
    ContourCuts and boosts frequencies above 5 kHz
    Combined Audio Output (Mix)Input 1 and Input 2 Mixed Output (Rear panel). Two (2) Phono connectors, unbalanced, -10 dBu nominal output level, +19 dBu maximum, impedance 10 ohms
    Monitor OutputFront panel. One (1) 3.5 mm (0.14 in.) connector, unbalanced, adjustable output level, +7 dBu maximum, impedance 10 ohms. 100 mW, 32 ohms
       
    ControlsFront PanelPower, Test Tone on/off, Channel up/down, Input Level, Transmit Level, Contour, Monitor Level
    Rear PanelInput 1 Level (Line, Mic, Mic-Phantom Power), Input 2 Level (-10/+10 dBu)
    Internal AdjustmentsCompression ratio for audio processor. Slope adjustable from 1:1 to 4:1. Default 2:1
    ProgrammingStereo on/off, Processing on/off
       
    IndicatorsUnit PowerRed LED illuminates when the unit is powered up (front panel)
    Input 1, Input 2, Transmit Level Indicates Input 1, Input 2, and Transmit audio levels. 10 segment LED's (8 green, 2 red)
    StereoIndicated by a green LED when on (front panel)
    ProcessingIndicated by a green LED when on (front panel)
    RF CarrierIndicates carrier is active on the LCD Display (front panel)
    LCDChannel designation, lock status, RF Carrier, programming (front panel)
    Test ToneRed LED illuminates when test tone enabled (front panel)
       
    PowerPower SupplyIn-line switching mode power supply, Listen part number LA-205
    Input: 100-240 VAC, 47-63 Hz
    Output: 30 VDC, 1.5 A
    Output Connector: RJ-45
    Compliance: UL and CE Listed
    Power Output:Two (2) RJ-45 jacks. For remote powering up to two (2) radiators
    Power Line CordNorth America, Type B, (LT-82-01)
    Asia, UK, Type G, (LT-82-02)
    Euro Type J, (LT-82-03)
       
    PhysicalDimensions (H x W x D)1.75 x 8.50 x 9.13 in. (4.5 x 21.5 x 23 cm)
    ColorDark Grey with White Silk Screening
    Unit Weight2.6 lbs. (1.18 kg)
    Unit Weight with LA-205 Power Supply3.8 lbs. (1.72 kg)
    Shipping Weight4.4 lbs. (2.00 kg)
    Rack MountingOne (1) rack space high (1U), 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in a single rack space. Optional rack mount (LA-326) not included. 
       
    EnvironmentalTemperature - Operation14 °F (-10 °C) to +104 °F (40 °C)
    Temperature - Storage-4 °F (-20 °C) to +122 °F (50 °C)
    Humidity0 to 95% relative humidity, non-condensing
       
    Specifications are subject to change without notification

    None

    Used With

    Accessories

    Support Documents

    • FAQ

    How many carriers does the LT-82 produce?
    One.
     
    How many carriers can be produced simultaneously in a room?
    Four. You will need one (1) LT-82 per carrier.
     
    How do you interconnect multiple LT-82 units?
    Units are daisy chained using a short piece of coax cable (supplied with each LT-82).
     
    Is there any performance degradation in stereo mode?
    Yes, stereo operation raises the noise floor slightly.
     
    Can I operate some channels in mono and others in stereo?
    Yes.
     
    How many radiators does the LT-82 power?
    The LT-82 powers up to two (2) Listen LA-140 radiators.
     
    How are radiators connected to the LT-82?
    The carrier (signal) is connected using coax cable; power is connected using standard CAT-5 cabling.
     
    Can the LT-82 be operated on 230 VAC?
    Yes, the LT-82 has a universal power supply that can be used anywhere in the world.
     
    What happens if the radiator power cable is shorted?
    To protect the system, the LT-82 will shut down the power to the radiator cable until the problem is eliminated.
     
    Can I use the LT-82 with other manufacturers’ radiators?
    Yes, but the LT-82 will not power those radiators.

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