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Listen Technologies Stationary LA-350 Design Manual

Ir system design
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Summary of Contents for Listen Technologies Stationary LA-350

  • Page 3 Dear Valued Customer, Thank you for choosing Listen! All of us at Listen are dedicated to provide you with the highest quality products available. We take great pride in their outstanding performance because we care that you are completely standards and back them with a limited lifetime guarantee. We stand ready to answer any questions you might have during installation or in the operation of our products.

  • Page 5: Table Of Contents

    Stationary Infrared Table of Contents Design Guide Infrared Technology Overview System Overview Designing a System Design Tools LT-82 Stationary IR Transmitter Quick Reference Page Setup and Operating Instructions Accessories for LT-82 LA-140 IR Radiator Quick Reference Page Setup Instructions LED Indications Mounting your Radiator Accessories for LA-140 LR-42/LR-44 4-Channel IR Receivers...
  • Page 9 Stationary Infrared Design Guide Table of Contents Infrared Technology Overview System Overview Designing a System Design Tools...

  • Page 11: Infrared Technology Overview

    Infrared Technology Overview Infrared or “IR” technology uses infrared light to transmit audio without wires. This type of transmission is advantageous to RF transmission because it is secure, it is not susceptible to RF interference, and one receiver can be used for multiple rooms within a facility. The transmitter accepts an audio signal and then frequency modulates an RF carrier at 2.3, 2.8, 3.3 and/or 3.8MHz.

  • Page 12: System Overview

    System Overview ers. Single Channel System A single channel system consists of one LT-82 transmitter and one or more radiators. The diagram below shows such a system with one radiator. The radiator is powered from the power supply at the transmitter. This power supply can supply enough power for the LT-82 and up to two LA-140 radiators.
  • Page 13 System Overview Multiple Channel System A multiple channel system consists of two to four LT-82 transmitters and one or more radiators. The diagram transmitter. This power supply can supply enough power for the LT-82 and two LA-140 radiators. If you need more than two radiators, you can use the power from the other transmitters.
  • Page 14 System Overview Key Concepts of Designing a Stationary IR System Each LT-82 transmitter used can power two LA-140 radiators Each LT-82 transmitter used can power up to two LA-140 radiators. If you design a system that requires more radiators than the transmitters can power, you need to order additional LA-205 power supplies. Each LA-205 can power up to two LA-140 Radiators.

  • Page 15: Designing A System

    Designing a System Determine the number of audio channels You will need to order one LT-82 transmitter for each audio channel. The Listen system can deliver up to four audio channels simultaneously. Determine the room size and shape Complete the room layout worksheet transmitters, power supplies and radiators using the worksheet key.
  • Page 16 Designing a System Horizontal Polar Pattern Vertical Polar Pattern Single Channel System Single Channel System...
  • Page 17 Designing a System It is a good idea to provide over-lapping coverage (like in a sprinkling system) of the signal whenever possible to ensure that the signal does not have drop outs. In addition, you should provide special radiator coverage for shaded areas such as under a balcony or in the front of a room where the front mounted radiators do not provide enough coverage.
  • Page 18 Designing a System If there is an area within a room (such as under a balcony) that is shielded from the main radiation pattern, you will need to provide additional radiator(s) to cover this area.
  • Page 19 Designing a System To double the radiator power, it is possible to vertically or horizontally mount two radiators together using the Height of Radiators It is critical to mount the radiators at the proper height. If the radiator is mounted too low, the coverage required angle of the radiator will cause the radiation pattern to be compromised.
  • Page 20 Designing a System Determine the number of radiators required is recommended that you draw the room out indicating the location of each radiator in the room and cable runs from the transmitter(s) and power supplies (if any) to the radiator. We have provided the room layout...
  • Page 21 Designing a System Complete the system layout worksheet Complete the system layout worksheet for Power and RF cable lengths, delay compensation, required number of power supplies, and height and angle of radiators. Refer to the system layout worksheet example below.
  • Page 22 Calculator. The calculator uses the following formula to determine the delay setting of Delay Setting = (DFR – RDT) x CD / 25 NOTE: If your calculations suggest a delay setting greater than nine, please contact Listen Technologies tech support for more information.
  • Page 23 Designing a System Complete the system materials worksheet Complete the system materials worksheet that determines the quantity of each part number required for your Transmitters Fill in the number of transmitters required. Each transmitter includes a short piece (15 inches) of RG-58 coaxial RF cable for multiple channel installation interconnections.
  • Page 24 Designing a System Radiator Mounting Options Since the radiator comes with most radiator mounting options, there are only two additional choices. Dual radiator mounting Floor stand Radiator Power Supplies Fill in the number and type of LA-205 power supplies required (if any). Cables From the System Layout Worksheet, insert the cable lengths for the preassembled coaxial RF cables (LA-391) and CAT-5 power cables (LA-393).
  • Page 25 Notes...
  • Page 29 System Layout Worksheet...

  • Page 33: Stationary Ir Transmitter

    System Materials Worksheet Description Stationary IR Transmitter Power Cord Transmitters Part Number LT-82-01 Quantity Description Universal Rack Mount Kit (Mounts two LT-82 units) Part Number LA-326 Transmitter Rack Mounting Quantity Description Stationary IR Radiator Color Grey Radiators Part Number LA-140-GY Quantity Description Dual Radiator Mounting Bracket...

  • Page 39: Package Contents

    LT-82 User’s Manual Table of Contents Quick Reference Page Setup and Operating Instructions Accessories for LT-82 LT-82 Package Contents • LT-82 IR Transmitter • LA-205 Power Supply • LA-89 IR Interconnection Cable • LT-82 Quick Reference Card • LT-82-01 (North America) •...
  • Page 41 selection shall be capable of being locked. Multiple transmitters shall be capable of being daisy-chained together to transmit up to four channels simultaneously. The transmitter shall have a timer that shuts off the carriers after 30 minutes when no audio is present at the transmitter.

  • Page 42: Block Diagram

    LT-82 Block Diagram Universal Power Supply 115/230VAC LA-205 50/60hz 30VDC, 1.5A (provided) Automatic Terminal Overload CAT5 Protection DC Out Transmitter RF Board Functions controlled by the CPU Module Input 1 VU Meter 12VDC Line Phantom Female XLR-1/4” Combo Connector 2/Tip 3/Ring 1/Sleeve INPUT 1 Mono Only...

  • Page 43: Quick Reference

    LT-82 Quick Reference and Input 2 levels. Adjust audio input levels of Input 1 and Input 2 here Input additional RF signal here for multi-channel systems signal to radiator(s) and/or additional LT-82 supply here (included) tone to aid system setup boosts or cuts high frequencies match the level of your Input 2 source stereo or mono...

  • Page 44: Unpack The Product

    LT-82 Setup and Operating Instructions Unpack the Product Remove outer packaging and plastic cover. Verify all components are present and no physical damage has occurred to the product. Mount LT-82(s) in Rack (if desired) If rack mounting the transmitter(s), install the optional rack mount kit (part LA-326) according to the instructions included with the kit.
  • Page 45 LT-82 Setup and Operating Instructions Connect LT-82 Power to Radiator(s)(if desired) The radiator(s) can be powered by either the transmitter Power Output or remotely with a power supply (LA-205) near the radiator. If powering the radiator(s) with the transmitter, connect the transmitter Power Output to the radiator Power Input with CAT-5 cable.
  • Page 46 LT-82 Setup and Operating Instructions Select Operating Channel Select the operating channel Select the operating channel (1-4). For single channel systems any channel can be used. In multi-channel systems each transmitter must be on a different channel. RF-Off Channel Setting Information This channel does not have a carrier present however allows pass through from RF input to RF output.
  • Page 47 LT-82 Setup and Operating Instructions Connect Audio Inputs balanced connection using either an XLR or 1/4” phono connector. Input 2 has two unbalanced mixing phono connectors. Use Input 1 if you are using a microphone or if you have a balanced connection such as from a professional audio mixer (you can also use Input 1 for unbalanced connections).
  • Page 48 LT-82 Setup and Operating Instructions Set Stereo and Process Features Stereo and Process Mode Descriptions Stereo Mode Process Mode To Disable or Enable Stereo and Process Features Transmitter is shipped to you with Stereo and Process disabled With the unit on press and hold the channel select “Down” button Set Auto-Timeout Feature If 30 minutes passes without audio to transmitter the unit will stop sending a signal to the radiators When the L/O icon is illuminated on the LCD and a period of 30 minutes passes without audio being...

  • Page 49: Accessories For Lt-82

    Accessories for LT-82 LA-326 Universal Will mount up to two LT-82 units LA-391 RG-58/50 Ohm Coaxial Cable Preassembled, specify length LA-393 RJ-45/CAT-5 Preassembled, specify length LA-112 RG-58 50 Ohm Coaxial Cable Specify length LA-115 LA-71 RJ-45 CAT-5 Connector (Pkg. of 10) LA-70 CAT-5 Cable Specify length...
  • Page 50 Notes...
  • Page 51 Notes...
  • Page 52 Notes...

  • Page 57: Package Contents

    LA-140 User’s Manual Table of Contents Quick Reference Page Setup Instructions LED Indications Mounting Your Radiator Accessories for LA-140 LA-140 Package Contents • LA-140 Stationary IR Radiator • IR Radiator Quick Reference Card • 25 feet RG-58 Coaxial Cable • 25 feet CAT-5 Power Cable •...
  • Page 59 The radiator-emitter shall have a single carrier transmitting area of no less than 10,000 ft The radiator shall be powered via CAT-5 cabling and the RF from the transmitter shall be carried by 50 ohm coaxial cable. The radiator shall have three indicating LEDs for power, no carrier present and carrier present.

  • Page 60: Quick Reference

    LA-140 Quick Reference This yellow LED is lit when the radiator is not connected to a transmitter or radiator. This red LED is lit when there is power to the radiator. Input RF signal from a transmitter or radiator here. Output RF signal to an additional radiator here.

  • Page 61: Unpack The Product

    LA-140 Setup and Operating Instructions Unpack the Product Remove outer packaging and plastic cover. Verify all components are present and that no physical damage has occurred to the product. Mount Radiator Determining Location Generally a higher location with a clear line of sight to the area the receivers will be used in is recommended. Refer to the design guide for detailed instructions about determining the location to mount the radiator(s).
  • Page 62 LA-140 Setup and Operating Instructions Set Delay Compensation Switch Single Radiator Systems The position of the delay compensation switch does not matter in single radiator systems. Multiple Radiator Systems It is necessary to select the correct delay compensation switch setting for each radiator to ensure that each radiator transmits the same signal at exactly the same time in an overlapping ,multiple radiator system.

  • Page 63: Front Led Indicators

    LA-140 Setup and Operating Instructions Set Compatibility Switch (SW2) If using a Listen LT-82 Transmitter with the Listen LA-140 Radiator leave this switch in the “OFF” position. switch to the “ON” position. IMPORTANT: Ensure this switch is in the “OFF” position whenever using the radiator with the Listen LT-82 Transmitter.

  • Page 64: Mounting Your Radiator

    LA-140 – Mounting your Radiator Overview but is required for mounting two radiators side-by-side). Read through the following mounting strategies to determine which works best for your application and then follow the instructions for mounting. NOTE: The parts in this section are not shown to scale. Mounting Hardware Pieces Tilt Arm “A”...

  • Page 65: Wall Box Mounting

    LA-140 – Mounting your Radiator Wall Box Mounting The wall box mount is a preferred mounting option for the LA-140 IR Radiator. The wall box mount al- lows secure mounting of the radiator as well as for allowing the necessary cables to be placed inside the wall.
  • Page 66 LA-140 – Mounting your Radiator Pull CAT-5 and Coaxial cables through (if necessary) Determine correct angle Determine correct angle setting to use for the radiator using the design guide, see page 13 of design guide. Attach Radiator to Wall Box Plate ATTENTION: Note the angle measurements on Tilt Arm “B”...
  • Page 67 LA-140 – Mounting your Radiator Hollow Wall Mounting A hollow wall installation is not as preferrable as a wall box installation but can be done without problems. • Hollow Wall Mounting Screws • Tilt Arm “A” • Mounting Hardware Screws Installation Steps Fasten Wall Box Plate to wall ATTENTION: The Wall Box Plate must be used in this installation to provide a secure base for the radiator...
  • Page 68 LA-140 – Mounting your Radiator Attach Tilt Arm “B” Hardware Screws. Any of the seven holes in Swing Arm can be used for this. Pull CAT-5 and Coaxial cables through (if necessary) Determine correct angle Determine correct angle setting to use for the radiator using the design guide, see page 13 of design guide. Attach Radiator to Wall Box Plate ATTENTION: Note the angle measurements on Tilt Arm “B”...
  • Page 69 LA-140 – Mounting your Radiator Attach Safety Mounting Cable The radiator has a safety cable attached to the top of the swing arm. This cable must be attached to a secure base to prevent the radiator from falling in the event of a mounting hardware component failing. Possible injury to persons and damage to the radiator is prevented by securely attaching this cable to a base.

  • Page 70: Corner Mounting

    LA-140 – Mounting your Radiator Corner Mounting The radiator is mounted in the corner of a room with or without a wall box available for this use. A wall box must be at least four inches from the corner if using for this install. •...
  • Page 71 LA-140 – Mounting your Radiator Attach Corner Mount Bracket Mounting Harware Screws. Use all four available holes to ensure a secure attachment. Attach Tilt Arm “A” Attach Tilt Arm “B” Hardware Screws. Any of the seven holes in Swing Arm can be used for this connection.
  • Page 72 LA-140 – Mounting your Radiator Pull CAT-5 and Coaxial cables through Determine correct angle Determine correct angle setting to use for the radiator using the design guide, see page 13 of design guide. Attach Radiator to Corner Mount Bracket together. ATTENTION: Note the angle measurements on Tilt Arm “B”...
  • Page 73 LA-140 – Mounting your Radiator Attach Safety Mounting Cable The radiator has a safety cable attached to the top of the swing arm. This cable must be attached to a secure base to prevent the radiator from falling in the event of a mounting hardware component failing. Possible injury to persons and damage to the radiator is prevented by securely attaching this cable to a base.

  • Page 74: Ceiling Mounting

    LA-140 – Mounting your Radiator Ceiling Mounting • Hollow Wall Mounting Screws (if attaching to wall box) or Hollow Wall Anchors with Screws (if attached to hollow wall) • Tilt Arm “A” • Mounting Hardware Screws Installation Steps Attach Wall Box Plate securely to ceiling Screws Hollow Wall Anchors with Screws.
  • Page 75 LA-140 – Mounting your Radiator Attach Tilt Arm “A” Mounting Hardware Screws, not up and down on plate. Attach Tilt Arm “B” Mounting Hardware Screws. It is recomended that the top hole of the radiator swing arm be used using included mounting hardware screws in this install.
  • Page 76 LA-140 – Mounting your Radiator Attach Radiator to Wall Box Plate using Tilt Arm “A” and Tilt Arm “B” ATTENTION: Note the angle measurements on Tilt Arm “B” and verify that the correct angle is selected before fully tightening Tilt Bolt. Attach Safety Mounting Cable The radiator has a safety cable attached to the top of the swing arm.
  • Page 77 LA-140 – Mounting your Radiator Desk/Table Mounting non-permanent mounting strategy. • Tilt Arm “A” • Mounting Hardware Screws Installation Steps Attach Tilt Arm “A” Attach Tilt Arm “B” Screws. The bottom hole in Swing Arm must be used for this install. Mounting Hardware Screws Tilt Arm “A”...
  • Page 78 LA-140 – Mounting your Radiator Determine correct angle Determine correct angle setting to use for the radiator using the design guide, see page 13 of design guide. Attach Radiator to Desk/Mic Stand ATTENTION: Note the angle measurements on Tilt Arm “B” and verify that the correct angle is selected before fully tightening Tilt Bolt.
  • Page 79 LA-140 – Mounting your Radiator Microphone Stand Mounting Radiator is mounted on a standard microphone stand. • Universal Stand Nut • Tilt Arm “A” Installation Steps Attach Universal Bracket to Mic Stand Attach Tilt Arm “A” Attach Tilt Arm “B” Hardware Screws.
  • Page 80 LA-140 – Mounting your Radiator Determine correct angle setting Determine correct angle setting to use for the radiator using the design guide, see page 13 of design guide. Attach Radiator to Desk/Mic Stand arms together. ATTENTION: Note the angle measurements on Tilt Arm “B” and verify that the correct angle is selected before fully tightening Tilt Bolt.
  • Page 81 LA-140 – Mounting your Radiator Tripod Stand Mounting Radiator is mounted on a tripod stand. If Listen part number LA-337 is used the radiator can be mounted up to nine feet high. • Universal Stand Nut • Tilt Arm “A” •...
  • Page 82 LA-140 – Mounting your Radiator Attach Tilt Arm “B” hardware screws. The bottom hole in Swing Arm must be used for this install. Determine correct angle Determine correct angle setting to use for the radiator using the design guide, see page 13 of design guide. Attach Radiator to Desk/Mic Stand ATTENTION: Note the angle measurements on Tilt Arm “B”...
  • Page 83 LA-140 – Mounting your Radiator Dual Radiator Mounting It is possible to mount two Listen LA-140 Radiators either side by side or on top of each other using the the previous scenerios except you will be working with two radiators connected together. The instruc- tions for connecting two radiators together with the LA-342 bracket are included with the bracket.

  • Page 84: Accessories For La-140

    Accessories for LA-140 LA-205 IR Extended Power Supply (powers two LA-140 radiators) are using more than two LA-140 radiators per LT-82 transmitter or if you wish to remote power the radiator(s). LA-112 RG-58 50 Ohm Coaxial Cable specify length LA-391 RG-58/50 Ohm Coaxial Cable preassembled, specify length LA-393...
  • Page 85 Notes...
  • Page 86 Notes...

  • Page 91: Lr-42/Lr-44 4-Channel Ir Receivers

    LR-42/44 User’s Manual Table of Contents LR-42/LR-44 4-Channel IR Receivers LR-42 Quick Reference Page LR-44 Quick Reference Page Setup Instructions Operating Instructions Locking Instructions Programming Instructions Programming Examples Programmable Features Detailed Descriptions Accessories for LR-42/LR-44 LR-42/44 Package Contents • LR-42 IR Stethoscope 4-Channel Receiver (or) LR-44 IR Lanyard 4-Channel Receiver •...
  • Page 93 The IR stethoscope receiver shall be capable of receiving on four carriers (2.3, 2.8, 3.3, 3.8 MHz) and the channel shall be displayed on one of four front panel LEDs. The receiver shall be capable of being locked on a channel. The receiver shall be capable of receiving a stereo signal on each of the four carriers.
  • Page 94 The Lanyard IR Receiver shall be capable of receiving on four carriers (2.3, 2.8, 3.3, 3.8 MHz) and the channel shall be displayed on one of four front panel LEDs. The receiver will accept mono or stereo earphones with a 3.5 mm connector. The receiver shall be capable of being locked on a channel.

  • Page 95: Lr-42 Quick Reference

    LR-42 Quick Reference Speakers located in ends of stetho arms, place in ears to listen to audio Use to adjust volume level in speaker(s) Press to turn unit on, press and hold to turn unit off Displays which channel the unit is currently tuned to.

  • Page 96: Lr-44 Quick Reference

    LR-44 Quick Reference Use to adjust volume level in speaker(s) Press to turn unit on, press and hold to turn unit off Adjust the loop size of the lanyard by pulling on this ball (usually done after Displays which channel the unit is currently tuned to.

  • Page 97: Setup Instructions

    LR-42/44 Setup Instructions Unpack the Product Remove outer packaging and plastic cover. Verify all components are present and that no physical damage has occurred to the product. Determine Battery Type to be Used of unit using the following process (purchase Listen part number LA-363). Remove alkaline battery compartment Press down on compartment and push towards the bottom of unit.
  • Page 98 LR-42/44 Setup Instructions IMPORTANT: Do not install AAA NiMH batteries in included alkaline battery pack because the batteries will not charge in this pack, only use a Listen provided sealed battery pack (LA-364) for battery charging. Remove alkaline battery compartment Place LA-364 battery pack in receiver Remove alkaline battery compartment by pressing down on compartment and pushing towards the bottom of unit.
  • Page 99 LR-42/44 Setup Instructions Connect an Earphone or Headset (LR-44 model only) An earphone or headset will connect to the jack on the bottom of the unit. Either mono or stereo connectors may be used with Listen receivers. Make sure to push the connector all the way into the jack.
  • Page 100 LR-42/44 Setup Instructions Select a Channel and/or Program Channel Selection Method The Select button is used to change the channel. Press the button once to change the channel. The unit will either seek or scroll through the channels depending upon which channel selection method you have enabled.

  • Page 101: Operating Instructions

    LR-42/44 Operating Instructions have been enabled/disabled, with the factory default settings highlighted. See page 102 for detailed information about programming and operating units using non-default settings. Connect an Earphone or Headset (LR-44 Model Only) An earphone or headset will connect to the jack on the bottom of the unit. Either mono or stereo connectors may be used with Listen receivers.
  • Page 102 LR-42/44 Operating Instructions LR-42 LR-44 Position the receiver so the stethoscope arm tips rest in the ear holding the unit below the chin of the user. Position the lanyard around the neck holding the unit below the chin of the user. If desired, pull on the lanyard adjustment ball to decrease the size of the lanyard loop (bringing the cord above the point it passes through the receiver.
  • Page 103 LR-42/44 Operating Instructions Turn the Unit On Turn on the unit by pressing either button on the front of the receiver. ATTENTION 1: The LR-44 model must have a headset connected to the unit to turn on and remain on for longer than ten seconds. ATTENTION 2: If using a new LA-364 NiMH battery pack the batteries may need to be put through one charge cycle before they will turn the unit on.
  • Page 104 LR-42/44 Operating Instructions LED Sleep Mode The receiver will shut off the channel indicator LEDs after a period of 10 seconds passes without any buttons being pressed. The receiver will still produce audio and the volume can still be adjusted, only the LEDs shut down.

  • Page 105: Adjust Volume Level

    LR-42/44 Operating Instructions Adjust Volume Level Use the control dial on the top of the unit to adjust the volume to a comfortable level. Checking Battery Level and Current Channel Checking Battery Level Tapping the power button will display the battery level on the channel indicator LEDs. When a battery check is initiated all four LEDs will turn on.

  • Page 106: Auto Shut-Off Feature

    LR-42/44 Operating Instructions Checking Current Channel Auto Shut-Off Feature After 10 seconds After 10 seconds if there is no headset plugged into the headset jack (LR-44 model only). This allows for a quick battery status check without having to plug in a headset. This function is also disabled while in Program Mode.

  • Page 107: Locking Instructions

    LR-42/44 Locking Instructions Locking the Receiver on One Channel The unit can be electronically locked on one channel so that it will not change channel even if the Select button is pressed. It is recommended to lock the receivers on the channel that is being used in systems that do not require the user to change channels (single channel systems).

  • Page 108: Program Mode Overview

    LR-42/44 Programming Instructions Program Mode Overview Auto Seek and Squelch. The following sections outline the procedures required to enter the program mode, modify the programmable features and exit the program mode. There are also several examples of how to use the program mode to change the settings of the receiver. Lastly, the end of this programming section provides a detailed description about each programmable feature and when they can or should be used.
  • Page 109 LR-42/44 Programming Instructions Program Mode Functionality Diagram Use this chart to help with navigating through, and adjusting the features within, the program mode. Feature Stereo On/Off Channel Lock-Out Auto-Seek Squelch No Function Reset to Defaults Exit Program Mode LED on Pressing the Advances to Feature 2 Advances to Feature 3...
  • Page 110 LR-42/44 Programming Instructions Channel Lock-Out “Sub-Mode” Instructions While in Channel Lock-Out “Sub-Mode” The channels that would be available are represented by the corresponding channel indicator LED being on and the channels that would be “locked out” are represented by the channel indicator LED being off. Press the Select button to advance to the next channel(s) active combination.
  • Page 111 LR-42/44 Programming Instructions Squelch Adjustment “Sub-Mode” Instructions While in Squelch Adjustment “Sub-Mode” There are 16 available squelch settings. The 16 settings are represented by binary code (refer to the chart below). Press the Select button to advance to the next possible squelch setting. Press the Power button to save the selected squelch setting, and return to regular program mode.

  • Page 112: Resetting To Defaults

    LR-42/44 Programming Instructions Resetting to Defaults It is possible to reset the unit to factory default settings and the unit must be in the program mode to be reset. While in program mode, select the “Reset to Defaults” function and press the power button. Exiting Program Mode There are two ways to exit the program mode Wait 10 seconds without pressing a button (any changes made are saved.)

  • Page 113: Programming Examples

    Programming Examples Example #1 I want to turn on/off the Stereo Mode function and then exit program mode Enter Program Mode (see page 102) Using the functionality chart on a previous page note that this is the Stereo On/Off Function. Note that the channel 4 LED indicates whether or not this function is on/off.
  • Page 114 Programming Examples Example #3 I want to lock-out channels 2 and 3 using the Channel Lock-Out Function. Enter Program Mode. Using the functionality chart on a previous page note that this is the Stereo On/Off Function. Note that this is the Channel Lock-Out function. Press the Power button to enter the Channel Lock-Out “Sub-Mode”.
  • Page 115 Programming Examples Example #5 I want to tighten the squelch setting to setting 10. Enter Program Mode. Using the functionality chart on a previous page note that this is the Stereo On/Off Function. Note that this is the Squelch Adjustment Function. Press the Power button to enter the Squelch Adjustment “Sub-Mode”.

  • Page 116: Programmable Features Detailed Descriptions

    Programmable Features Detailed Descriptions Stereo Mode (Default is OFF) Stereo Mode Function This function must be set to match the type of signal that the receiver is receiving. If the receiver is receiving a mono signal this function must be OFF. If the receiver is receiving a stereo signal this function must be ON. When to enable Stereo Mode Stereo Mode must be enabled if the receiver is receiving a stereo signal from the transmitter.
  • Page 117 LR-42/44 Battery Charging Information Requirements NiMH Battery Pack (LA-364) It is not possible to charge batteries in the alkaline battery pack that comes with the unit. The LA-364 NiMH rechargeable battery pack must be used. IR 8-Unit Charging/Storage Station The only way to charge the LA-364 battery packs is by inserting them into the LA-350 Charging Station.
  • Page 118 LR-42/44 Battery Charging Information Place LR-42/LR-44 Receiver into a slot Place LR-42/LR-44 Receiver into a slot on the LA-350 case. Ensure that the LA-350 charging station has power to it. When the unit is seated correctly a red LED will light When the unit is seated correctly a red LED will light up on the LA-350 charging station adjacent to the charging slot indicating charging has begun.
  • Page 119 LR-42/44 Battery Charging Information Charging LA-364 Battery Pack Separate from the Receiver Install Battery Pack Conversion Plates to charging tray included with LA-350). Place LA-364 battery pack into converted tray Place LA-364 battery pack into converted tray of LA-350. Ensure that the LA-350 charging station has power to it.
  • Page 120 LR-42/44 Battery Charging Information When the battery pack is fully charged the red LED will turn off When the battery pack is fully charged the red LED will turn off and a green LED will light up to indicate battery pack is fully charged. The green LED will stay lit until the battery pack is removed from the charging station.

  • Page 121: Accessories For Lr-42/44

    Accessories for LR-42/44 LA-152 LA-150 LA-364 IR Alkaline battery compartment Replacement Lanyard for LR-44 included with receiver requires LA-350 Charging Station LA-350 LA-351 LA-161 LA-151 8-Unit IR Receiver 8-Unit IR Receiver Storage Station Replacement Ear Tips (Pkg. of 20) Charging/Storage Station LA-364 required LA-162 LA-164...
  • Page 122 Notes...
  • Page 127 LA-350/351 User’s Manual Table of Contents LA-350 Charging Requirements/Instructions Cord Tidy Rack LA-350 Package Contents • LA-350 Charging/Storage Station • LA-204 Power Supply • Cord Tidy Rack • LA-350 Quick Reference Card LA-204 LA-351 Package Contents • LA-351 Storage Station •...
  • Page 129 • Can charge or store up to eight LR-42 and/or LR-44 receivers at one time. • Pockets grab and hold receivers so they will not fall out. • Can charge battery packs while they are attached to the receiver or while they are separate from the receiver (by use of included conversion tray).
  • Page 130 • Can store up to eight LR-42 and/or LR-44 receivers at one time. • Pockets grab and hold receivers so they will not fall out. • Lanyard cords are stored without tangling with use of Cord Tidy Rack. Specifications Compliance Safety Compliance Controls User Controls...

  • Page 131: Charging Requirements/Instructions

    LA-350 Charging Requirements/Instructions Requirements to Charge Receivers Requirements to Charge Receivers To charge Listen LA-42 or LR-44 IR Receiver batteries you must have an LA-364 Rechargeable the alkaline battery pack that comes with the receiver. The LA-364 battery packs can be charged while attached to the receiver or they can be charged separate from the receiver.
  • Page 132 LA-350 Charging Requirements/Instructions Charging Scheme To Charge Batteries while in Receivers Place receivers in charging slots Place receivers in charging slots. It may be necessary to press down on the units to ensure that they are touching the charging contacts. To Charge Batteries separate from Receivers Install conversion tray Install conversion tray in slots.
  • Page 133 LA-350 Charging Requirements/Instructions Place LA-364 battery packs in converted charging slots Place LA-364 battery packs in converted charging slots. Verify batteries are charging Verify batteries are charging. When units begin to charge a red LED will come on near the charging slot. This LED will stay lit until the receivers are fully charged. Verify full charge Verify full charge.

  • Page 134: Cord Tidy Rack

    LA-350/351 Cord Tidy Rack The Cord Tidy Rack The Cord Tidy Rack can be used, if desired, to help with organizing the lanyard cords of the LR-44 receiver during charging or storage. Insert the tidy rack into the holes on top of the station to use. Cord Tidy Rack...
  • Page 135 Notes...
  • Page 136 Notes...
  • Page 141 Supplementary Information Table of Contents Troubleshooting Frequently Asked Questions Compliance Information Warranty Contacting Listen...

  • Page 143: Troubleshooting

    Troubleshooting I believe my radiator has power but none of the LEDs on the front are on. My radiator is not radiating a signal. If there is no audio at the transmitter for 30 minutes, the radiator(s) will stop radiating to conserve the life of the radiator diodes.
  • Page 144 Troubleshooting I cannot get my receiver to scroll to the channel I want to use. There are two reasons why the receiver would not scroll to the channel you want the unit to be on. trying to tune the unit to. See page 102 for more information about Auto-Seek mode. The second is that the unit is programmed to not tune to the channel you are trying to tune it to.

  • Page 145: Frequently Asked Questions

    Frequently Asked Questions How many radiators can an LT-82 power? Up to two radiators can be powered using an LT-82. You must use an external power supply (LA-205) for more radiators. How many radiators can an LA-205 power? Up to two radiators can be powered using an LA-205 external power supply. What do the LEDs on the front of my radiator tell me? Refer to page 57 for detailed information about the LED indicators on the front of the LA-140 Radiator.
  • Page 146 Frequently Asked Questions to rewire the system every time I do this. Is this possible? Yes. The transmitter should be placed on channel “--”. This does not add a channel to the system in your daisy-chain, however allows other channels to pass through. See page 40 for more information.

  • Page 147: Compliance, Warranty And Contact Information

    This Class A digital apparatus complies with Canadian ICES-003. These devices are RoHS compliant. Listen Technologies Corporation (Listen) warrants its transmitters and receivers (LT-82, LT-700, LT-800, LR-100, LR-42, LR-44, LR-300, LR-400, LR-500, LR-600) to be free from defects in workmanship and material under normal use and conditions for the useful lifetime of the product from date of purchase.
  • Page 148 Listen Technologies Corporation 14912 Heritagecrest Way +1.801.233.8992 +1.800.330.0891 North America +1.801.233.8995 www.listentech.com Printed in the United States of America © 2008 Listen Technologies Corporation ® All Rights Reserved 2008115...

This manual is also suitable for:

Lt-82laLa-351Lr-42Lr-44La-140Lt-82