Listen Technologies LT-84 2-channel infrared transmitter/radiator

General Description

The Listen Technologies LT-84 is a 2-channel infrared radiator providing 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 2787 m² coverage area with LR-4200-IR/LR-5200-IR receivers or 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 with 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 Expansion Radiators (LA-141) can be added for additional coverage, when mounted within 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.

Features

Cost-effective solution for secure assistive listening in smaller spaces such as classrooms, courtrooms, corporate meeting rooms, and theatres
The only product of its kind that provides complete, gap-less coverage in small-to-medium spaces
Simple to use, cost-effective, and designed to blend in to any environment
Flexible frequency selection of 2.3, 2.8, 3.3, 3.8 MHz
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

Delivery Includes

1 LT-84 Infrared transmitter/radiator
1 LA-210 12 VDC universal power supply/power cord
1 LA-344 Flexible mounting hardware
2 Phoenix type connectors
1 LA-303 Multi-lingual assistive listening notification sign
1 Quick start guide

Technical Data

Frequency Response: 20 Hz - 20 kHz (+/- 1 dB) Line Input 63 Hz - 15 kHz (+/- 3 dB) System Specification (wireless end-to-end with LR-44)
Signal-to-Noise Ratio: >70 dB (SNR) Line Input >60 dB (SNR) System Specification (wireless end-to-end with LR-44)
Total Harmonic Distortion: <0.1% (THD) Line Input <2% (THD) System Specification (wireless end-to-end with LR-44)
Balanced Line Input: Mono Input, Two Phoenix Type connector, balanced, + 4 dBu nominal input, +14 dB headroom, impedance 100k Ohms
Microphone Input: Two 3.5mm Tip/Sleeve connector, -30 dBu nominal input, +14 dB headroom, impedance 4.4k Ohms, 5 VDC bias supply
Unbalanced Line Input: Stereo/Mono Input. Two Dual (RCA) Phono connectors, unbalanced, -10 dBu nominal input, +14 dB headroom, impedance 10k Ohms
Power Switch: Three position switch: Power OFF, Power ON-Indicator Lights OFF, and Power ON-Indicator Lights ON
Level Control Knob: Two audio taper rotary potentiometer, counter-clockwise decreases input mix level, clockwise increases input mix level
Carrier Frequency Selection: Two four position rotary switches (2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz)
Power Supply LED: Green LED on in-line power supply indicates AC power is applied
Audio Level Indicators: Two Green LEDs, two Red LEDs, Green LED indicates Audio presence and Red LED indicates peaks in the audio
RJ-45 Amber LED: Solid Amber indicates carrier is present and IR is being transmitted
RJ-45 Green LED: Solid Green indicates power is applied to unit, flashing indicates unit has entered power save mode
Number of Channels: Two channels, Selectable carrier frequency
Frequency Accuracy: +/- .005% stability 0 to 50 °C
Transmitter Stability: 50 PPM
Expansion Link Output: Two RJ-45 connectors - Provides RF Signal and Power, CAT-5e cable 24 AWG, 30 metres maximum cable length, two LA-141s per output connector
Modulation: FM Wideband, ±50kHz deviation max, 50 μS pre-emphasis
Carrier Frequencies: 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz, Selectable
Power save Mode: Carrier will shut off when no audio is present for 15 minutes on both channels to preserve radiator life
IR Emitter Power: 1.49 W
Coverage Area: 2787 m² single channel with LR-4200-IR/LR-5200-IR receivers or 697 m² single channel with LR-42/LR-44 receivers
Power Supply Output: 12 VDC, 4 A, 48 W
Power Supply Connector: 2.5 mm ID barrel connector, centre positive
Power Output: Two RJ-45 connectors providing Power and RF signal for up to two LA-141 expansion radiators on each output
Power Supply Type: In-line switching mode power supply, Listen part number LA-210
Power Supply Input: 100-240 VAC, 50-60 Hz
Power Supply Line Cord: IEC line cord, North America Type B (LT-84-01), Asia and UK Type G (LT-84-02), Euro Type C (LT-84-03), Australia Type I (LT-84-04)
Unit Weight: 0.4 kg
Dimensions (H x W x D): 3.81 x 27.2 x 10.5 cm
Colour: Black with White Silk Screening
Unit Weight with Power Supply: 0.8 kg
Shipping Weight: 1.54 kg
Temperature – Operation: -10 °C to +40 °C
Temperature – Storage: -20 °C to +50 °C
Relative Humidity: 0 to 95% relative humidity, non-condensing