User Manual - National Audio Systems
Contents
1. 1 C38 ica row Zi O k J Power Input RCA Inpu Level RCA Input Level Green LED Stereo Indicators Stereo Indicators Power Indicator Power Switch Line Input Transmission Line Input Transmission Indicator Lights On Off On Off I PAGES LA 141 ListenIR Expansion Radiator Package Contents LA 141 ListenIR Expansion Radiator 1 25 ft 7 6 m CAT 5e Cable LA 344 Mounting Hardware Quick Start Guide LA 141 Listen IR Transmitter Radiator Combo LA 344 Mounting Hardware 1 25 ft 7 6 m CAT 5e Cable Pan amp Tilt X Mount Adaptor E Ceiling Tile E Mounting Plate All Thread Pi SE 2 Extension Bars P Pan and Tilt Mounting Plate Lock Screw Hex Key Flush Mounting Plate Quick Start Guide LA 141 Rear View Quick Reference LA 141 Rear View Safety Security Expansion Link Amber LED Cable Slot In Out RJ 45 Status Indicator oe 1 2 2 Led P D GEES e a ole leas gt E S Sr J Indicator Lights Channel 1 Channel 2 Green LED On Off Switch el el Power Indicator ay ay Compensation Compensation PAGE 6 I LT 84 and LA 141 Coverage The units emit a beam of infrared light from the front panel Infrared light is not visible t2. Installation and Operation LT 84 ListenIR Transmitter Radiator Combo LA 141 ListenIR Expansion Radiator LISTEN ere eT OVE Oa Es Table of Contents Safety CAUtiONS eebe enee eeler 2 Ge el de EE 2 Compliance Information 3 Compliance Notice FCC and Industry Canada Statements oo ccccccccessssessseesseesnecsseessseesnecsssesseseanessisesseceaneesnes 3 System OVENrVIOW eet 4 LT 84 ListenIR Transmitter Radiator COMO 0 0 AA 5 Package COMN E 5 LT 84 Rear View Quick Reterence cc ccccccsccsescsscsssscssesessssscsesssssesssscssssuesnsecesssssssssstssssussesuessssesasenensssussareseneeens 5 LA 141 ListenIR Expansion Radiator oo ceecccccecssssssesssesssscsseesseesssssssecssecsssessuecsssesusssusssssesseessuesssessessuessueesseesiesneereeens 6 e le 6 LA 141 Rear View OuickReterence cccscsscssescesessssssscssessssssesssevsssssessussessnssssssevsiesnansesssevsessetsutensnessteeesaneey 6 LT 84 and LA 141 Coverage eseou 7 Designing a SVetent eebe ee Eeer ee 9 Flexible Mounting Hardware IMStructions 00 0 0 cccccccscssssesssessssesssecssecsscssnessscessecsssssssecssessneesuuecssessessunesnieesessuneannes 0 Mounting Hardware K C dE NEE 0 Mounting Provision Thread WI x 20 6MM X 1 0 thread eeceeeseccsecsseessessseesseessnessseessecssnesssecssecsseesuuesssseeseessnessseesseseaeasies 0 Wall Surtace Mounting EXMP E vi cscs rers enebet rdeeter Eet 1 Ceiling Surface Mountine Example sispan e E red 1 Mounting Two Units with Linking
3. ure th ure th ure th e LT 84 has not entered Power Save Mode due to no active audio for 15 minute e audio source is playing and plugged into the LT 84 properly e green level indicator is solid green and the red level indicator occasionally red with audio peaks e receivers are operating on the same channel frequency as the LT 84 e LT 84 is transmitting IR light and that the IR light is not being blocked by objects f some of the receivers work but others do not check the battery and or earphones Receiver s audio is weak and noisy ake s flashes ake s are lit s ake s ake s ake s olid ure the green level indicator is solid green and the red level indicator occasionally red with audio peaks ure LA 141s are connected properly and that the power and status indicator LEDs ure the LT 84 and LA 141 s IR light is focus towards the listening audience ure the receiver is directed towards the LT 84 and LA 141s ure that all units are transmitting IR light and that the IR light is not being blocked by objects Add more LA 141s to increase the overall coverage E PAGE 17 LT 84 Specifications LT 84 Stationary IR Transmitter Radiator Combo Power Supply Type In line switching supply Listen part number LA 210 Power Supply Input 100 240 VAC 50 60 Hz Power Supply Output 12 VDC 4A 48W center positive 2 5 mm ID barrel connector Power Line Cord IEC line cord North America Type
4. B LT 84 01 Asia and UK Type G LT 84 02 Euro Type C LT 84 03 Australia Type LT 84 04 Carrier Frequencies 2 3 MHz 2 8 MHz 3 3 MHz 3 8 MHz selectable Number of Channels Two 2 Channels Modulation FM Wideband 50kHz deviation max 50 uS pre emphasis Expansion Link Output Two 2 RJ 45 connectors CAT 5e cable 24 AWG 100 ft 30 m maximum cable length two 2 LA 141s per output connector Power Save Mode Shuts off carrier when no audio is present for 15 minutes IR Emitter Power 1 49 W Coverage Area 7 500 ft 697 m single channel when used with Listen Receivers Controls Power Switch Three 3 position switch Power OFF Power ON Indicator Lights Indicator Lights On Off OFF Power ON Indicator Lights ON Level Control Knob Audio taper rotary potentiometer counter clockwise decreases input mix level clockwise increases input mix level Frequency Selector Four 4 position rotary switch 2 3 MHz 2 8 MHz 3 3 MHz 3 8 MHz Transmission ON OFF Two 2 position switch transmission OFF transmission ON Power Supply LED Green LED on in line power supply indicates AC power is applied Audio Level Indicators Green LED indicates Audio presence and Red LED indicates peaks in the audio Green LEDs Power Solid Green indicates power is applied to unit flashing Indicator RJ 45 indicates unit has entered power save mode Amber LEDs Status Solid Amber indicates carrier is present and IR is being transm
5. Mount EXAMple nnt nntnntsntitninnnnnnnnrn annann nan nann ane n 1 Interconnection and Control edu 2 Connection of the ExternallPower eege 2 Connection ot External AUDIO SOURCES eege erter 3 IPR Frequency SelectondConprol btt ttt Eaa EDt EEE SR SSE ENESES ENEE ESEP ERE Nera EEEE Eet rat 4 Listen R Expansion Link RAS Connections sprs dese aE E a T E RET 5 al Eet EE NEE 6 el BI le el 7 Neel E 8 BEE Weeder e EE 9 Warranty Information EE 20 Technical Support CODE techne EES EES eebe eiert EN I PAGE 1 Safety Cautions CAT 5e Cable Safety Do NOT Plug the LT 84 ListenIR Transmitter Radiator Combo CAT 5e cable into anything other than an LA 141 ListenIR Expansion Radiator The LT 84 CAT 5e Expansion Output RJ 45 connection is proprietary and is not compatible with Ethernet or any other system Failure to comply with this caution can damage the LT 84 LA 141 or other equipment and will void the warranty Hearing Safety The LT 84 is designed to be used with Listen Technologies receivers These receivers are designed to amplify audio to a high volume level which could potentially cause hearing damage if used improperly To protect your hearing make sure the volume is turned down before putting on the ear speaker or headphones then adjust the volume up to the minimum setting require to hear clearly Do not allow children or other unauthorized individuals to have access to this product without supervision Medical Device Safety Befo
6. Optional Optional ee E a Dees E E oe tg T an d S D Zi de E 8 D s Lat 2H DEI EI PAGE 4 E LT 84 ListenIR Transmitter Radiator Combo Package Contents LT 84 ListenIR Transmitter Radiator Combo LA 210 12 VDC Universal Power Supply Power Cord LA 344 Mounting Hardware Fa z 2 Phoenix Type Connectors LT 84 Stationary IR Transmitter Radiator Combo Quick Start Guide LA 303 Small Room Signage Kit Power gora S S D GI Keel S 2 Phoenix Type LA 210 12 VDC Universal Power Supply Connectors LA 344 Mounting Hardware Hearing Assistance Available Asistencia auditiva a su disposici n Aide l audition ick Start Guide iv Pan amp Tilt 1 4 x 20 Mount Adaptor Ceiling Tile Mounting Plate This facility is equipped with a hearing assistance system All Thread Piece i 2 Extension Bars P Pan and Tilt Lock Screw Mounting Plate Quick Start Guide LA 303 Small Ri S Kit mall Room Signage Ki Deng Flush Mounting Plate LT 84 Rear View Quick Reference LT 84 Rear View Mic Frequency Mic Frequency Expansion Link Input Selector Input Selector Output RJ 45 Safety Security Level Control Level Control Amber LED Cable Slot 3 Knob Knob Status aiea o
7. 0 n n 3 9 40 d y 12 50 N p 15 60 ee 18 70 21 80 24 0 3 6 9 12 15 18 21 24 27 30 34 37 40 43 46 49 52 55 58 61 64 67 Meters E PAGE 7 Figure 3 LT 84 and LA 141 Single Channel Coverage Pattern footprint Overlapping 50 ft 15 24 m apart Feet 100 90 80 70 60 50 40 30 20 10 0 10 20 30 40 50 60 70 80 90 100 e 2 150 Sey 46 140 43 130 40 120 37 110 I 34 100 30 90 27 80 24 70 21 60 18 50 15 de LT 84 LA 141 12 30 9 20 6 10 3 D 0 30 27 24 21 18 15 12 9 6 3 0 3 6 9 12 15 18 21 24 27 30 Meters Figure 4 Single Channel Coverage Pattern footprint same emission point at an angle of 15 degrees off axis Lo 50 60 70 80 90 100 110 120 130 140 150 160 170 49 46 oam 34 30 27 24 21 18 15 T Meters Feet Figure 5 Single Channel Coverage Pattern fooptrint same emission point at an angle of 30 degrees off axis __ 70 80 90 100 110 120 130 140 150 160 170 Feet zl L 49 46 43 40 37 34 30 27 24 21 Meters PAGE 8 E Designing a System Use the following steps when designing an IR system 1 Determine the number of audio channels that will be used 1 or 2 2 Determine the room size and shape 3 Use the room size and shape informati
8. 0to39ft 40 to 49 ft CableLength 3to28m 3to58m 6to88m 9 1t0119m 12 2t0149m 2 3 MHz 0 3 3 3 3 2 8 MHz 3 3 3 3 3 3 3 MHz 3 3 2 2 2 3 8 MHz 2 2 2 2 2 S0to59ft G60to69ft 70to79ft 80to89ft 90 to 100 ft Cable Length ie oto1gm 183to21m 21 3to24m 244to27 1m 27 4to30 5m 2 3 MHz 3 3 3 3 3 2 8 MHz 2 2 2 2 2 3 3 MHz 2 2 1 1 1 3 8 MHz 1 1 1 1 0 Indicator Lights Input Level indicators Channel 1 and Channel 2 Green LED Off and Red LED Off Low or no audio present power switch 2 is off or in the indicator lights off position Green LED solid and Red LED flashing Audio is present and adjusted properly on the input JL e Green LED Off and Red LED Ch1 and Ch2 flashing quickly 4 times with a 2 second off state repeated Frequency selectors are set to the same frequency and transmission switch is active on both channels error state Level Indicators LT 84 RJ 45 Green and Amber LED Indicators Green LED OFF Power switch is Off or in the indicator lights Off position bad power supply or not connect to AC power outlet Amber LED Expansion Link Status Indicator Output RJ 45 Green LED solid Power is applied to the unit Green LED flashing Unit has entered Power Save Mode o W i Ti gt JL Se DP Amber LED Off No Carrier present or problem with IR LEDs Amber LED solid Carrier is present and unit is actively transmitting IR Gieen LED P
9. 13 IR Frequency Selection Control The LT 84 provides the ability for the user to select the IR carrier frequency to be used for transmission of the audio connected to the channel input The carrier frequencies are at 2 3MHz 2 8MHz 3 3MHz and 3 8MHz Refer to the diagram below for selection and control of the IR carrier Ore 3 9 oi i IR Frequency IR Transmission Selection On Off Control 1 Located on the right side of the channel interconnection and control is the IR frequency selection This is a four 4 position rotary selection switch With the switch rotated to the counter clockwise stop the IR frequency is set to 2 3MHz Position 2 is 2 8MHz position 3 is 3 3 MHz and position 4 is 3 8MHz 2 The IR Transmission On Off switch is used to activate the IR signal transmission for this channel In the up position the IR signal is active In the down position the IR signal for this channel is NOT active Note If both channels are active and set to the same frequency the LT 84 will indicate an error state and enter Power Save Mode Power save mode is indicated by the Green Power Indicator LEDs flashing slowly The error mode is indicated by 4 quick flashes on the Red Level Indicator LEDS and then turning off for 2 second repeated until the error is resolved PAGE 14 E Listen IR Expansion Link RJ 45 Connections The coverage area of the LT 84 can be extended by adding up to four 4
10. 600 mA per LA 141 maximum of two 2 LA 141s daisy chained with CAT 5e cable 24 AWG 100 ft 30 m to each LT 84 Expansion Link Output Carrier Frequencies 2 3 MHz 2 8 MHz 3 3 MHz 3 8 MHz Number of Channels Two 2 Channels Modulation FM Wideband 50kHz deviation max 50 uS pre emphasis Expansion Link In Out Two 2 RJ 45 connectors CAT 5e cable 24 AWG 100 ft 30 m maximum cable length two 2 LA 141s per daisy chain total daisy chain cannot be extend beyond two expansion radiators Power Save Mode Shuts off carrier when no audio is present for 15 minutes IR Emitter Power 1 49 W Coverage Area 7 500 ft 697 m single channel when used with Listen Receivers Controls Indicator Lights Two 2 position switch Indicator Lights OFF Indicator Lights ON Delay Compensation Four 4 position rotary switch setting 0 1 2 3 Indicators Green LEDs Power Solid Green indicates power is applied to unit Indicator RJ 45 Amber LEDs Status Solid Amber indicates carrier is present and IR is being transmitted Indicator RJ 45 Physical Color Black Dimensions H x W xD 1 5 x 10 7 x 3 9 in 3 81 x 27 2 x 10 5 cm Weight 0 6 Ibs 0 28 kg Shipping Weight 3 0 Ibs 1 4 kg Environmental 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 ICS 03 CE UL CUL C Tick CCC PSE KC GS ROHS
11. Ceiling Tile Mounting Plate Pan and Tilt Lock Screw Hex Key O Flush Mounting Plate Threaded Mounting Socket x 20 6mm x 1 0 thread The LT 84 LA 141 have a x 20 thread 6mm x 1 0 thread hole located in the bottom and top of the enclosure This threaded hole is used to attach the units to the provided universal mounting kit or to any user provided mounting device using a WI x 20 thread 6mm x 1 0 thread Refer to the diagrams below of ceiling and wall mounting using the universal kit provided 1 4 x 20 Thread Mounting Hole Top and Bottom PAGE 10 E Wall Surface Mounting Example Wall Mount Ceiling Surface Mounting Example Ceiling Mount Solid ceiling surface or T bar grid mounting Mounting Two Units with Linking Mount Example Linking Mount RB PAGE 11 Interconnection and Control The LT 84 is a two 2 channel I R Transmitter Radiator Separate input and control sections are located on the rear panel of the LT 84 to accommodate the two 2 channel transmission Refer to the diagram below for location of these two separate channel control areas power input and expansion link output RJ 45s Expansion Link Power Input Output RJ 45 Connections and Setup Connections and Setup Channel 1 Connection o
12. LA 141 Expansion Radiators 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 Refer to the diagram below Amber LED Status Indicator Expansion Link Output RJ 45 Green LED Power Indicator A LT 84 Pal al E CAT 5e 24 AWG LA 141 LA 141 wy Optional OR Optional oe 1 2 i r 4 AN v i 2 KR Ss Se z CAT 5e CAT 5e LA 141 LA 141 Optional Optional PE T fs ES 2 KE Set Delay Compensation For a single channel application set both Channel 1 and 2 Delay Com pensation switches to the same setting For a two channel application set Delay Compensation switches channel 1 and 2 independently Pick appropriate frequency row then move over to the overall cable distance from the LT 84 to the LA 141 being set this is the switch setting E PAGE 15 Delay Compensation Switch Setting _ Imaan 10to19ft 20to29ft 3
13. WEEE PAGE 19 Warranty Information Listen Technologies Corporation Listen warrants its transmitters and receivers LT 82 LT 700 LT 800 LT 803 LR 100 LR 42 LR 44 LR 200 LR 300 LR 400 LR 500 LR 4200 LR 5200 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 Listen warrants it s Listen IR Radiators LA 140 LT 84 LA 141 to be free from defects in workmanship and material under normal use and conditions for three years from the date of purchase Listen warrants its Digital IR products T8 T16 RAD25 R8 R32 to be free from defects in workmanship and material under normal use and conditions for two years from the date of purchase Listen warrants its Noise Canceling Microphone LA 270 to be free from defects in workmanship and material under normal use and conditions for one year from date of purchase Listen warrants it s Charging Carrying Cases LA 306 LA 311 LA 313 LA 317 LA 318 LA 319 LA 320 LA 321 LA 322 LA 323 LA 324 LA 325 LA 380 LA 381 to be free from defects in workmanship and material under normal use and conditions for one year from date of purchase All other products and accessories are warranted for 90 days from date of purchase This warranty is only available to the original end purchaser of the product and cannot be transferred Warranty is onl
14. f the external power adaptor Power for the LT 84 is provided by a 12 VDC 4A universal switching power supply The diagram below highlights the connection point for power and the associated power switch 4 12V 4A Fi Power Switch o ER Indicator Lights On Off Fesch Power Input Barrel Connector 1 The supplied power adaptor is an in line universal switching power supply that can be used with an AC power source from 100 240 VAC 50 60Hz The overall length of the line cord and DC power cable is 10 ft 3 m Note that if the LT 84 is located further than 10 ft 3 m from the nearest AC outlet provisions will need to be made for extending the power 2 The Power Switch On OFF control is a three 3 position switch located to the right of the power input connector a Inthe top position the unit is turned ON and the indicator lights are active b In the middle position the unit is turned ON and the indicator lights are NOT active c Inthe bottom position the LT 84 and LA 141 are OFF PAGE 12 E Connection of External Audio Sources Each channel has the option for three 3 audio connections The interconnection and control of each channel is identical We will refer to the interconnection and control of channel 1 only Refer to the diagram below for connection of audio sources Mic Level Control Level Stereo 7 I
15. hnical Support Contact f technical service is needed please contact Listen Pre authorization is required before returning Listen products If products were damaged in shipment please contact the carrier then contact Listen for replacement or repair requirements payable by the carrier Listen s corporate headquarters are located in Bluffdale Utah U S A and are open Monday through Friday 8am to 5pm Mountain Time LISTEN TECHNOLOGIES 14912 Heritage Crest Way Bluffdale Utah 84065 4818 1 801 233 8992 1 800 330 0891 North America 1 801 233 8995 Fax support listentech com www listentech com PAGE 21 NOTES PAGE 22 I LISTEN TECHNOLOGIE 14912 Heritage Crest Way Bluffdale Utah 84065 4818 1 801 233 8992 1 800 330 0891 North America 1 801 233 8995 Fax support listentech com www listentech com 2014 Listen Technologies Corporation All Rights Reserved For further details regarding use adjustment or programming of your Listen products visit our website at www listentech com support manuals or contact Listen at 1 801 233 8992 or 1 800 330 0891 20141229
16. itted Indicator RJ 45 Microphone Input 3 5 mm 0 14in Tip Sleeve connector 30 dBu nominal input 14 dB headroom impedance 4 4k Ohms 5 VDC bias supply Line Input Stereo Mono Input Two 2 RCA Phono connectors unbalanced 10 dBu nominal input 14 dB headroom impedance 10k Line Input Mono Input Phoenix Type connector balanced 4 dBu nominal input 14 dB headroom impedance 100k 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 Total Harmonic Distortion lt 0 1 THD Line Input lt 2 THD System Specification wireless end to end with LR 44 Signal to Noise Ratio gt 70 dB SNR Line Input gt 60 dB SNR System Specification wireless end to end with LR 44 Physical Color Black Dimensions H x W xD 1 5 x 10 7 x 4 1 in 3 81 x 27 2 x 10 5 cm Weight 0 8 Ibs 0 4 kg Unit Weight with Power Supply 1 8 Ibs 0 8 kg Shipping Weight 3 4 Ibs 1 54 kg Environmental 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 Compliance Standards FCC part 15 ICS 03 CE UL CUL C Tick CCC PSE KC GS ROHS WEEE PAGE 18 E LA 141 Specifications LA 141 Listen IR Expansion Radiator Power Supply 12 VDC provided via LT 84 Expansion Link Output RJ 45s Current Draw
17. ndicators Line Input View of Channel 1 audio interconnections and control 1 The left side of the channel interconnection is a 3 5mm tip sleeve condenser microphone level input This is a 30 dBu nominal microphone level input with a 5 VDC bias supply Any of Listen s microphones may be connected to this input Note that a 3 5mm extension cable will most likely be required when using the microphone input 2 RCA unbalanced stereo audio input is provided through two phono connectors These are a 10 dBu nominal level unbalanced input and the two inputs are summed together 3 Abalanced audio input is provided through the three 3 pin Phoenix type connector This is a 4 dBu nominal level balanced input 4 To the right of the balanced input is the audio input level adjustment control This control rotates clockwise to increase the audio level counter clockwise to decrease the audio level From the factory this adjustment is set fully counter clockwise 5 Aredand green LED located to the right of the level adjustment is used to determine the proper level adjustment With a typical audio source connected adjust the audio level adjustment up or down until the green LED is solid green and the red LED flickers red occasionally with peaks in the audio Note LT 84 will enter Power Save Mode after 15 minutes of no audio This state is indicated by the Green LED Power indicator on the expansion link output RJ 45 flashing slowly PAGE
18. o the human eye Below is a scaled diagram of the typical line of sight IR pattern or footprint emitted from the units When using a unit in single channel transmit mode the coverage area is 7 500 ft 697 m and in 2 channel transmit mode the coverage area is 3 750 ft 348 m2 Use the diagrams below when evaluating a given space to determine the number of units required and placement of those units for best line of sight coverage with an LR 44 or LR 42 receiver Figure 1 LT 84 or LA 141 Single Unit Coverage Pattern footprint 1 amp 2 Channel Transmission Feet 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 80 24 70 21 60 18 50 15 40 12 30 20 20 30 40 50 60 18 70 21 80 24 0 3 6 9 12 15 18 21 24 27 30 34 37 40 43 46 49 52 55 58 61 Meters f Figure 2 _T 84 and LA 141 Single Channel Coverage Pattern footprint from same emission point 40 increase Feet 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 n 24 70 21 60 l 18 50 Je Biia 15 40 Ni 12 30 f i 9 20 Dateie 6 10 i b 3 0 LT 84 i LT 84 LA 141 H 10 p 3 20 e 4 6 3
19. on along with the appropriate 1 or 2 channel coverage pattern footprint to overlay the footprint on the room dimensions and determine the number of units required and the placement of those units to cover the desired listening audience Best performance is achieved When radiators face and have direct line of sight to audience When a system provides over lapping coverage like a sprinkling system When special coverage is provided for shaded areas like under a balcony When mounted above and angled down into the listening audience 9 16 ft 2 8 4 9 m high and at an angle between 10 and 30 degrees Examples below are provided for design concept only and do not represent the actual LT 84 coverage pattern footprint Direct Line Of Sight Coverage Over Lapping Coverage E PAGE 9 Flexible Mounting Hardware Instructions LT 84 amp LA 141 Universal Mounting Hardware Kit A universal mounting kit is supplied to simplify the mounting process for the LT 84 and LA 141 This kit contains the components for mounting to a flat surface wall or ceiling attaching to a drop ceiling grid T bar or connecting units together Please refer to the diagram below Mounting Hardware Pieces Pan amp Tilt 1 4 x 20 Mount Adaptor All Thread Piece i 2 Extension Bars Mounting Plate Cover
20. ont panel and provides line of sight coverage of 7 500 ft 697 m2 The LT 84 is perfect for high quality audio applications like assistive listening audio description or language interpretation in corporate boardrooms courtrooms training rooms classrooms and theaters Its flexible audio inputs accept microphone consumer and line level inputs which are all mixed to the modulated IR transmission IR receivers then detect the modulated IR transmission and convert the IR signals back into an audio signal and presents it to headphones For better line of sight coverage or for coverage in larger areas the LT 84 can be combined with up to four 4 LA 141 Listen IR Expansion Radiators The LA 141s are connected in a daisy chain fashion to the LT 84 via a 24 AWG unschielded CAT 5e cable A maximum of two 2 LA 141s can be connected to each expansion link output on the LT 84 with a maximum cable length of 100 ft 30 m mi iE Power Supply MIC RCA Phoenix CAT 5e Connector 24 AWG Microphone Electret Unbalanced Audio Source Balanced Audio Source LA 141 el B LA 141 Optional Optional ee NFS i os i 78 i s PI au 9 an CAT 5e CAT 5e LA 141 LA 141
21. ower Indicator LA 141 RJ 45 Green and Amber LED Indicators Green LED OFF LT 84 power switch is Off LT 84 has entered Power Save Mode LA 141 indicator lights switch in Off position bad CAT 5e cable or cable is too long Expansion Link Amber LED In Out RJ 45 Status Indicator Green LED solid Power is applied to the unit Amber LED Off No Carrier present bad CAT 5e cable or cable is too long problem with IR LEDs Amber LED solid Carrier is present and unit is actively transmitting IR reen LED Power Indicator PAGE 16 E Troubleshooting The LT 84 Green LED Power Indicators are not lit Make sure the power supply is plugged into the LT 84 and plugged into an AC outlet Make sure the electrical outlet is on or if using a power strip make sure it is turned on Make sure the Power Switch is set to the Indicators Lights On position Make sure the 12 VDC in line switching power supply is lit green and that it is working The LT 84 s Ch1 or Ch2 Audio level Indicators do not light Make sure the LT 84 is plugged in Make sure the Power Switch is set to the Indicators Lights On position Make sure the audio source is active and that audio is presented to the audio input Make sure the audio input is connected properly and that the level control knob is turned clockwise Receivers do not pick up audio ake s ake s ake s flashes ake s ake s ure th ure th
22. re using Listen Technologies receivers with an implantable or other medical device consult your implantable or other medical device physician or manufacturer Always make sure you are using this product in accordance with the safety guidelines established by your physician or the implantable device manufacturer Recycling Instructions Recycling Help Listen Technologies protect the environment by taking the time to dispose of your equipment properly WN Product Recycling Instructions 4s Please do NOT dispose of your Listen Technologies equipment in the household trash Please take the equipment to an electronics recycling center OR return the product to the factory for proper disposal Battery Recycling Instructions Please do NOT dispose of batteries in the household trash Please take the batteries to a retail or community collection point for recycling PAGE 2 E Compliance Information No FCC license or radio approval is required to operate this equipment Compliance Notice FCC and Industry Canada Statements Compliance Notice This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 These devices may not cause harmful interference and 2 these devices must accept any interference received including interference that may cause undesirable operation FCC Statement This equipment has been tested and found to comply with the limits for a class B digital device pursuan
23. t to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help The user is cautioned that changes and modifications made to the equipment without the approval of manufacturer could void the user s authority to operate this equipment Industry Canada Statement This equipment complies with ICES 003 class B CAN ICES 3 B NMB 3 B I PAGE 3 System Overview The LT 84 is an all in one two channel infrared IR transmitter and radiator Transmitter Radiator Combo packed into a single mountable enclosure The LT 84 IR radiator is located behind the IR transparent fr
24. y valid if warranty card has been returned within 90 days of purchase This warranty is void if damage occurred because of misuse or if the product has been repaired or modified by anyone other than a factory authorized service technician Warranty does not cover normal wear and tear on the product or any other physical damage unless the damage was the result of a manufacturing defect Listen is not liable for consequential damages due to any failure of equipment to perform as intended Listen shall bear no responsibility or obligation with respect to the manner of use of any equipment sold by it Listen specifically disclaims and negates any warranty of merchantability or fitness of use of such equipment including without limitation any warranty that the use of such equipment for any purpose will comply with applicable laws and regulations The terms of the warranty are governed by the laws of the state of Utah In the first ninety days after purchase any defective product will be replaced with a new unit After ninety days Listen will at its own discretion either repair or replace transmitters and receivers with a new unit or a unit of similar type and condition Product that is not covered under warranty shall be repaired or replaced with a unit of similar type and condition based on a flat fee Contact Listen for details This limited warranty prices and the specifications of products are subject to change without notice PAGE 20 E Tec
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