The heart of the Listen Technologies ListenIR system is the LT-82 single-channel transmitter. Capable of operating in either mono or stereo modes, the LT-82 transmits your audio signal to and provides DC power for one or more LA-140 infrared radiator/emitter units through a standard CAT-5 cable. Plus, units can be combined to offer up to four (4) channels of mono or stereo audio for expanded applications.
The LT-82 transmitter is an ideal infrared transmitter for a wide range of assistive listening needs, including theaters, houses of worship, language interpretation, and more.
| Frequency Response | 63 Hz – 15 kHz (+/- 3 dB) |
| Signal-to-Noise Ratio | Mono: > 60 dBStereo: > 52 dB |
| System Distortion | < 2% total harmonic distortion (THD) |
| Audio Input 1 | Mono 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 2 | Stereo or Mono Input (Rear Panel). Two (2) Phono connectors, unbalanced, -10/+10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k |
| Audio Processing | Compression can be turned on/off. |
| Contour | Cuts and boosts frequencies above 5 kHz |
| Monitor Output | Front panel. One (1) 3.5 mm (0.14 in.) connector, unbalanced, adjustable output level, +7 dBu maximum, impedance 10 ohms. 100 mW, 32 ohms |
| Output/s | 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 |
| Programming | Stereo on/off, Processing on/off |
| Front Panel | Power, Test Tone on/off, Channel up/down, Input Level, Transmit Level, Contour, Monitor Level |
| Rear Panel | Input 1 Level (Line, Mic, Mic-Phantom Power), Input 2 Level (-10/+10 dBu) |
| Internal Adjustments | Compression ratio for audio processor. Slope adjustable from 1:1 to 4:1. Default 2:1 |
| LCD | Channel designation, lock status, RF Carrier, programming (front panel) |
| Unit Power | Red 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) |
| Stereo | Indicated by a green LED when on (front panel) |
| Processing | Indicated by a green LED when on (front panel) |
| RF Carrier | Indicates carrier is active on the LCD Display (front panel) |
| Test Tone | Red LED illuminates when test tone enabled (front panel) |
| Input/s | One (1) BNC connector, for connection from additional transmitter(s). 50 mV, 50 ohm, -15 dBm |
| Output/s | Two (2) BNC connectors, for connection to radiator(s) and/or additional transmitter(s). 50 mV, 50 ohm, -15 dBm |
| Carrier Frequencies | 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz |
| Number of Channels | Four (4) channels. Selectable one (1) channel per transmitter (mono or stereo) |
| Frequency Accuracy | +/- .005% stability 0 to 50 °C |
| Carrier Shut Off | Carrier will shut off when no audio is present for 30 minutes to preserve radiator life. |
| Transmitter Stability | 50 PPM |
| Power Supply | In-line switching mode power supply, Listen part number LA-205 |
| Power Supply Input | 100-240 VAC, 47-63 Hz |
| Power Supply Output | 30 VDC, 1.5 A |
| Power Supply Connector | RJ-45 |
| Power Output | Two (2) RJ-45 jacks. For remote powering up to two (2) radiators |
| Width | 8.50 in. (21.5 cm) |
| Height | 1.75 in. (4.5 cm) |
| Depth | 9.13 in. (23 cm) |
| Color | Dark Grey |
| Unit Weight with Power Supply | 3.8 lbs. (1.72 kg) |
| Shipping Weight | 6.0 lbs. (2.7 kg) |
| Rack Mounting | One (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. |
| Weight | 2.6 lbs. (1.18 kg) |
| Power Line Cord | IEC line cord, North America Type B (LT-84-01), Asia and UK Type G (LT-84-02), Euro Type F (LT-84-03), Australia Type I (LT-84-04) |
| Temperature – Operation | 14 °F (-10 °C) to +104 °F (40 °C) |
| Temperature – Storage | -4 °F (-20 °C) to +122 °F (50 °C) |
| Relative Humidity | 0 to 95% relative humidity, non-condensing |
| Standards | FCC Part 15, Industry Canada, CE, RoHS, UL |
