TOLL FREE: 888-496-4455
LISTENIR 2-CHANNEL TRANSMITTER/RADIATOR COMBO

LT-84

icon-pdf

 Download Product Data Sheet

 

The new LT-84 ListenIR 2-Channel Transmitter-Radiator is the only product of its kind that provides complete coverage in a wide variety of venue spaces. This advanced IR product is simple to use, cost-effective, designed to blend in to any environment, and offers twice the amount of IR power of similar products, and up to six times the coverage area.

A single unit provides up to 30,000 ft² (2787 m²) coverage area with LR-4200-IR/LR-5200-IR receivers or 7,500 ft² (697 m²) with LR-42/LR-44 receivers in single channel mode, ensuring that the entire room has coverage without gaps or null spots.

The LT-84 is the first IR system with Expansion Radiators (LA-141) that implement delay compensation—no signal cancellation drop outs.

It is the only two channel Transmitter-Radiator with up to four frequencies; 2.3 MHz, 2.8 MHz, 3.3 MHz, or 3.8 MHz, providing flexibility in the field and eliminating the need to purchase a specific frequency based transmitter-radiator.

In addition four (4) Expansion Radiators (LA-141) can be added for additional coverage, when mounted within 100 ft. (30.48 m) cable length from the LT-84.

A single CAT-5e cable carries both power and signal to the LA-141 Expansion Radiators making it a true one-cable connection.

Easy installation includes mounting hardware for wall, ceiling, or table mounting and a multi-lingual legislative compliance sign. Flexible frequency selection and input connectivity minimizes on-site installation hassles.

Includes

One (1) LT-84 ListenIR 2-Channel Transmitter/Radiator Combo
One (1) LA-210 12 VDC Universal Power Supply/Power Cord
One (1) LA-344 Flexible Mounting Hardware
Two (2) Phoenix Type Connectors
One (1) LA-303 Multi-Lingual Assistive Listening Notification Sign
One (1) Quick Start Guide

Highlights

  • The best, most cost-effective solution for secure assistive listening in smaller spaces such as; classrooms, courtrooms, corporate meeting rooms, and theaters.
  • The only product of its kind that provides complete, gap-less coverage in small-to-medium spaces.
  • This advanced IR product is simple to use, cost-effective, designed to blend in to any environment, and offers more coverage than similar products.
  • The LT-84 with one channel covers up to 30,000 ft² (2787 m²) with LR-4200-IR/LR-5200-IR receivers or 7,500 ft² (697 m²) with LR-42/LR-44 receivers.
  • Add up to (4) four expansion radiators (LA-141) for additional coverage, when mounted within 100 ft. (30.48 m) cable length from the LT-84.
  • Flexible frequency selection of 2.3, 2.8, 3.3, 3.8 MHz in a single unit.
  • True one-cable connection via single CAT-5e cable which carries both power and signal to the LA-141 expansion radiators.
  • Flexible input connectivity of Mic, RCA stereo sum, and Phoenix line level summed on each input channel simplifies installation.

Configurations

  • LT-84-01 ListenIR Transmitter/Radiator Combo (North America)
  • LT-84-02 ListenIR Transmitter/Radiator Combo (Asia, UK)
  • LT-84-03 ListenIR Transmitter/Radiator Combo (Euro)
  • LT-84-04 ListenIR Transmitter/Radiator Combo (Australia)

Architectural Specs

The Infrared Transmitter/Radiator Combo shall be capable of broadcasting up to two (2) audio channels with the choice of four (4) mono carrier frequencies; 2.3, 2.8, 3.3 and 3.8 MHz. Channel carrier selections shall be set via a back panel rotary switches.  The Transmitter/Radiator coverage area shall be up to 30,000 ft² (2787 m²) with LR-4200-IR/LR-5200-IR receivers or 7,500 ft² (697 m²) with LR-42/LR-44 receivers in single channel mode.  The device shall have a timer that shuts off the carriers after 15 minutes when no audio is present at the inputs. The Transmitter/Radiator shall have a SNR of 60 dB or better and THD of less than 2%. The device shall have an audio frequency response of 63 Hz to 15 kHz, +/- 3db.  The device shall have two (2) independent mixing audio inputs, one for each transmission channel. Each mixing input shall consist of one (1) 3.5 mm Microphone input, one (1) balanced Phoenix type input and one (1) unbalanced RCA stereo summing input. The device shall have independent channel audio processing with Limiting, Compression and Noise Gate as well as transmit level control and level indication via two (2) LEDs.  The Transmitter/Radiator shall provide Power and RF signal for up to Four (4) Expansion Radiators over a single CAT-5e cable. The LT-84 is specified.

CAD file(s)

Download CAD file

Specification LT-800-072

Audio

Frequency Response 50 Hz - 15 kHz (±3 dB)
Distortion <2% total harmonic distortion (THD) at 80% deviation
Signal-to-Noise Ratio SQ enabled 80 dB, SQ disabled 60 dB
Audio Processing Compression can be turned on/off, slope internally adjustable from 1:1 to 4:1, default 2:1
Audio Input 1 Rear panel, one (1) Female XLR or 1/4 in combo connector, balanced, 0 / -55 dBu (line/mic) nominal input level adjustable, -30 / +21 dBu (line/mic) maximum input level, impedance 20k / 1k ohm (line/mic), phantom power +12 VDC
Audio Input 2 Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohm
Contour Cuts and boosts frequencies above 5 kHz
Audio Output Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu maximum, impedance 10 ohm
Headphone Output Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm

Controls

Internal Adjustments Compression ratio for audio processor
User Controls

Front Panel: Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume control

Rear Panel: Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level (-10 / +10 dBu), RF power level (low, mid, high)

Programming SQ on/off, process on/off, channel lock

Indicators

Audio Input Status LEDs Indicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)
RF Power Indicated on the LCD (low, mid, high)
Processing Indicated by a green LED when on (front panel)
LCD Channel designation, lock status, RF power level, programming (front panel)
Test Tone Red LED illuminates when test tone is enabled.

RF

Frequency Accuracy ± .005% stability +32º to +122 ºF (0º to +50 ºC)
Number of Simultaneous Transmitters 6
Number of Channels 17 wide band, 40 narrow band
Frequency Range 72.025 - 75.950 MHz
Antenna Type Various antennas available
Transmitter Stability 50 PPM
Transmission Range Up to 1,500 ft. (457 m)
Output Power 80,000 uV at 3 m
Antenna Connector BNC

Power

Compliance UL, CE, GS, TÜV, RoHS
Power Supply Input 100-240 VAC, 50-60 Hz, 0.4 A
Power Supply In line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)
Power Supply Connector 0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
Power Supply Output 12 VDC, 1.3 A, 15.6 W

Physical

Height 1.75 in. (4.5 cm)
Width 8.50 in. (21.5 cm)
Depth 9.13 in. (23 cm)
Color Dark Grey with white silk screening
Weight 2.6 lbs. (1.2 kg)
Unit Weight with Power Supply 3.5 lbs. (1.6 kg)
Rack Mounting One (1) rack space height, 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in one rack space, optional rack mount (LA-326)
Shipping Weight 6.0 lbs. (2.7 kg)

Environmental

Temperature - Storage -20 ºC (-4 ºF) to +50 ºC (122 ºF)
Temperature - Operation -10 ºC (14 ºF) to +40 ºC (104 ºF)
Relative Humidity 0 to 95% relative humidity, non condensing

Compliance

Safety RoHS
RF FCC Part 15, Part 90, Industry Canada

Q What is the coverage area provided by the LT-84?
  A 30,000 ft² (2787 m²) single channel with LR-4200-IR/LR-5200-IR receivers or 7,500 ft² (697 m²) single channel with LR-42/LR-44 receivers
Q Can the LT-84 be remote powered?
  A Yes. Please reference the "LT-84 Remote Power" Tech Note on the Support Info tab for detailed instructions.
Q Does the number of channels (carriers) affect the coverage area?
  A Yes, for one (1) channel (carrier), the line-of-sight coverage area is 30,000 ft² (2787 m²) and for two (2) channels (carriers), the line-of-sight coverage area is 15,000 ft² (1394 m²) with LR-4200-IR/LR-5200-IR receivers.
Q How do I connect multiple Expansion Radiators (LA-141)?
  A A maximum of two (2) LA-141s can be connected to each Expansion Link output RJ-45 on the LT-84 with a maximum daisy chained CAT-5e cable length of 100 ft. (30.5 m). CAT-5e cable must be at least 24 AWG!
Q What is the warranty of the LT-84?
  A The LT-84 has a 3-year warranty.
Q How many Expansion Radiators (LA-141) can you use on a system?
  A Up to four (4).
Q How many channels (carriers) can the LT-84 produce?
  A Two (2) channels.
Q How many channels (carriers) can be produced simultaneously in a room?
  A Four (4) channels. You will need two (2) LT-84 (2 carriers per LT-84).

Newsletter Signup

WE ARE PROUD MEMBERS OF

LANGUAGES
ENGLISH
SPANISH
PORTUGUESE
FRENCH
HAITIAN CREOLE
DUTCH
RUSSIAN
ARABIC
OTHER EUROPEAN & MIDDLE EASTERN LANGUAGES

Name*
Your Email*
Phone*
Company*
Country*
Message*