User Manual - Listen Technologies
Contents
1. Installation and Operation LR 42 Stethoscope 4 Channel Receiver LR 44 IR Lanyard 4 Channel Receiver LA 350 8 Unit IR Receiver Charging Storage Station LA 351 8 Unit IR Receiver Storage Station LISTEN ih SE E N OE OGIES 2015 Listen Technologies Corporation All Rights Reserved For further details regarding use adjustment or programming of your Listen Technologies products visit our website at www listentech com support manuals or contact us at 1 801 233 8992 or 1 800 330 0891 2 Stationary IR Receivers Table of Contents LR 42 LR 44 4 Channel IR Receivers Specifications LR 42 Ouick Reference Page LR 44 Quick Refe rence Page Setup Instructions Operating Instructions Locking Instructions Programming Instructions Programming Examples Programmable Features Detailed Descriptions Accessories for LR 42 LR 44 LA 350 LA 351 8 Unit IR Receiver Storage Charging Cases LA 350 Specifications and Features LA 351 Specifications and Feature LA 350 Charging Requirements Instructions Cord Tidy Rack Supplementary Information Troubleshooting Frequently Asked Questions Compliance Information Warranty Contacting Listen Technologies 37 39 39 39 LR 42 44 Package Contents e LR 42 IR Stethoscope 4 Channel Receiver or LR 44 IR Lanyard 4 Channel Receiver e Quick Reference Card LR 42 Listen Part Number e LR 42 e LR 44 LR 44 4 LR 42 IR Stethoscope Receiver Specifications Architectural Speci2. LED sleep mode press and hold both the Select and Power buttons for three seconds 4 After holding for three seconds the channel indicator LED will flash once indicating that the unit has been successfully locked Once the channel indicator LED flashes you can release the Power and Select buttons Channel Unlock Procedure The procedure for unlocking the unit is the same as locking the unit Lock Indicators If you press the Select button to change the channel when the unit is locked the channel indicator LED will flash four times and the unit will not change channels Follow the lock unlock procedure shown above to be able to change the channel LR 42 44 Programming Instructions Program Mode Overview The following features can be programmed within the program mode Stereo On Off Channel Lock Out 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 Entering Program Mode et Make sure that the unit is off not just in LED sleep mode A Press and hold the Power and Select buttons for three seconds a When program mode is entered all four LEDs will flash once indicating successful entr
3. is complete In line switching mode power supply Listen part number LA 204 North America Type B LA 350 01 Power Line Cord Asia UK Type G LA 350 02 Euro type J LA 350 03 Power Supply Output Connector 5 0mm x 2 1mm Barrel 1 50 x 13 60 x 5 40 in 38 x 345 x 137 mm Grey with White Silk Screening Physical Unit Weight 1 2 Ibs 450 g Temperature Storage 20 C 4 F to 50 122 F Environmental Temperature Operation 10 C 14 F to 40 104 F TE rRe O E Specifications are subject to change without notification 31 LA 351 Specifications Features e Can store up to eight LR 42 and or LR 44 receivers at one time e Pockets grab and hold receivers so they will not fall out Storage Station can be mounted on a flat surface or on a wall e Lanyard cords are stored without tangling with use of Cord Tidy Rack Specifications LA 351 Safety Compliance FCC Industry Canada CE ROHS Dimensions H x W x D 1 50 x 13 60 x 5 40 in 38 x 345 x 137 mm Physical 0 9 bs 400 Shipping Weight 2 6 Ibs 1 10 kg Temperature Storage 20 C 4 F to 50 122 F Environmental 0 to 95 relative humidity non condensing Specifications are subject to change without notification 32 LA 350 Charging Requirements Instructions Requirements to Charge Receivers Requirements to Charge Receivers To charge Listen Technologies LA 42 or LR 44 IR Receiver batteries you must have an LA 364
4. override Auto Seek To turn the unit off press and hold the PWR button for 1 5 seconds 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 It will be necessary to wake up the receiver by tapping either the PWR or Select button before doing many of the operating tasks described in the next sections 5 Select Listening Channel Selecting Channel with EN Auto Seek Disabled Default OFF Press the Select button to scroll through the four channels If the channel indicator LED flashes four times when Select is pressed and the unit does not change channels it is locked on the current channel See page 18 for channel lock information Also if the unit skips over the desired channel it is because that channel has been locked out See page 19 for more information about the programmable features 5B Auto Seek Enabled The unit will continuously seek for a signal until one is found and then it will stay on that channel If the signal is not detected for a short time period or the user presses the SEL button the unit will seek for another signal and will keep seeking until a signal is detected If however the unit is locked on the current channel this lock will override Auto Seek and the unit wil
5. programming The batteries are not charging in my receivers Make sure that you have an LA 364 NiMH battery pack installed on the receiver and that the charger is plugged in 37 38 Frequently Asked Questions Frequently Asked Questions Can make my receiver change channels automatically if enter a room with a signal present ona different channel A Yes In Auto Seek Mode the receiver will automatically find an active channel If the unit squelches or the select button is pressed the unit will automatically search for an active channel Refer to page 19 for more information about Auto Seek Mode Q How do check the battery level on my receivers A When the unit is on press the power button momentarily The LEDs will display the battery Status for three seconds 4 LEDs 75 100 etc See page 16 for more information Q How do adjust the squelch setting on my receiver A See page 22 for detailed instructions on adjusting the squelch setting How can tell if the receiver has been fully charged when using the LA 350 A The green LED to the side of charging pocket will illuminate Q Can use rechargeable batteries in the alkaline battery compartment A No You must purchase a Listen Technologies LA 364 NiMH battery pack if you want to use a charging case My rechargeable batteries don t last very long Why A If your batteries have been through many charging cycles they may
6. seeks for channel four is stops on channel three you would use the Channel Lock Out Mode to eliminate the problem Auto Seek Default is Off Auto Seek function Upon power up with the Auto Seek feature enabled the unit will search for a channel with a signal present If a signal is found the unit will stop and stay on that channel If the unit does not find a signal it will continue to seek until one is found If the unit is on a channel with a signal it will remain on that channel until the signal is not detected for a short time at which point it will automatically seek for another channel with signal If the Select button is pressed when the unit is on a channel it will seek for the next channel with a signal When to Enable Auto Seek It is recommended to enable the Auto Seek feature in applications where a user will be moving from one area to another and does not want to have to manually change the channel on the receiver in each new area Also if it is desired that the Select button act as a seek button instead of a manual scroll to the next channel button Auto Seek should be enabled Priority If the receiver has been locked on a channel the lock will take priority over Auto Seek Squelch Setting Default is 3 Squelch Setting The purpose of squelch is to mute the audio output of the receiver when the signal from the radiator s is turned off or is too weak to be received Without squelch you would hear radio noise in your ea
7. Rechargeable Battery Pack for each receiver The LA 350 will not charge AAA NiMH batteries placed inside 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 Charging Instructions ES Plug power supply into power source 7 Plug power supply into power source gt 2 Plug power into charging storage station Plug power into charging storage station P N 33 LA 350 Charging Requirements Instructions 3 Charging Scheme EN To Charge Batteries while in Receivers 1 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 3B To Charge Batteries separate from Receivers 1 Install conversion tray Install conversion tray in slots 34 LA 350 Charging Requirements Instructions 2 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 5 Verify full charge Verify full charge When the units are fully charged a green LED will come on near the charging slot Receivers will charge up to 9 hours for a full battery lif
8. 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 See below for description of possible channel selection methods 5A Upon Power up When set to factory defaults the unit will turn on to the last channel is was tuned to upon power up However the unit can be programmed to continuously seek for a channel with signal upon power up until one is found Auto Seek See page 19 for more programming information Ey Single Channel Systems If you know what channel the unit will be used on and you know that there is only one channel that the unit will need to be used on you can lock it onto that channel now See page 18 for channel lock information see Multiple Channel Systems In systems that require the receivers to be able to access more than one channel you must decide which type of channel selection method you want enabled The default setting is that each time you press the Select button the unit will scroll to the next channel If you want the receiver to automatically begin seeking for another channel when the signal is lost such as walking from room to room in a museum the Auto Seek function must be enabled See page 19 for more information Select Stereo Mono Mode If the receiver will be receiving a mono signal stereo mod
9. ay be approaching the edge of the coverage pattern where the distortion and noise can be higher Also if the receiver is within 10 feet of the radiator it can cause the receiver to be saturated with IR It is a good idea to have a minimum distance of 10 feet from any radiator I turn up the volume wheel all the way on my receiver but the audio level is still too low Make sure that the Input level and Transmit Level is adjusted appropriately on the transmitter Low batteries in the receiver will also cause low output volume There is a tone in the audio Make sure the test tone button on the transmitter is OFF Also make sure that two transmitters are not on the same channel in a multi channel system I cannot change the channel on my receiver If when you attempt to change the channel the channel indicator LED only flashes but does not change channel the receiver is locked on the current channel See page 18 for information on unlock ing the unit I cannot get my receiver to scroll to the channel want to use There are two reasons why the receiver would not scroll to the channel you want the unit to be on The first is that the unit is in Auto Seek mode and is not finding a signal on the channel you are trying to tune the unit to See page 19 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 Refer to page 19 for more information about channel
10. de 1 4 g 4 2 4 4 12 4 gt 3 4 3 7 1 3 4 gt 8 2 3 4 g 5 gt H 1 2 3 4 g 5 default 3 4 LED off KE LED on channel active 21 LR 42 44 Programming Instructions Sguelch 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 ri Press the Select button to advance to the next possible squelch setting 3 Press the Power button to save the selected squelch setting and return to regular program mode Squelch Adjustment Sub Mode Functionality Diagram Use this chart to help with navigating through and adjusting the channels active within the Squelch Adjustment Sub Mode Squelch Squelch Navigating within the Squelch Adjustment Sub Mode Receiver LED Display Shows setting aad Pressing the Select Button Pressing the Power Button ydjanbs On asuey ISON Uydjanbs asoo7 CE BEE EEE ERE Saves the selected squelch setting and returns to regular program mode Advances to the next squelch setting w 4 y 4 g 4 4 g 4 asuey se 7 yojenbs 34311 ra Ga a LR 42 44 Programming Instructions Resetting to Defaults a It is possible to reset the unit to factory default settings but the unit must be in the program mode to be reset 2 While in program mode select the Reset to Defaults function and
11. e E 4 gt Red LED Charging in Process Green LED Charging Complete IMPORTANT When not using your LR 42 LR 44 Receiver it is recommended to keep the receiver on the charging station The charging station provides a maintenance charge that will keep the battery level at 100 If the receiver is not kept on the charger it can lose 20 of its characters per month 35 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 EET 36 Troubleshooting Troubleshooting The audio drops out in areas I don t believe it should Audio drop outs can occur for several reasons including the following The system was set up by trial and error With degradation of the IR diodes the system now has dropouts due to this reduction in IR output power from the radiator Make sure to always design the system using the footprint specifications found in the design guide Also in a multi radiator application the delay switch settings may be incorrect The radiators could be out of phase and therefore canceling each other out Make sure to set up the delay compensation switch correctly refer to the Transmitter Radiator manual for further information The audio sounds distorted in my receivers The receiver m
12. e is not enabled on LT 82 no action is required as Mono Mode is the default setting However if the receiver will be receiving a stereo signal the receiver must be set to Stereo Mode to function properly ya Setup Additional Programming if desired Additional programming options in addition to the Auto Seek and Stereo Mono Mode functions described above are the Channel Lock out and Squelch setting See page 19 for a complete explanation of the programming functions for the receiver 0 411 LR 42 44 Operating Instructions NOTE The following operating instructions briefly describe how a unit operates based on which programming features have been enabled disabled with the factory default settings highlighted See page 19 for detailed information about programming and operating units using non default settings EN Connect an Earphone or Headset LR 44 Model Oniy 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 Technologies receivers Make sure to push the connector all the way into the jack 2 Position the Unit on User s Body ATTENTION If desired this step can be done after turning the unit on and selecting a channel as long as the front of the receiver is not obstructed during the channel selection process IMPORTANT Always wear the receiver in such a way that there is nothing covering the front lens of the receiver If the front le
13. elch Adjustment Advances to Feature 5 Sub Mode See page 105 2 Advances to Feature 6 No Function a Unit flashes all LED s 3 times Reset to Defaults z Advances to Feature 7 indicating reset and then the unit shuts off Exits Program Mode and returns to Exit Program Mode Rea LO T Earne standard operating mode LED off 20 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 2 Press the Select button to advance to the next channel s active combination Press the Power button to save the selected channel s active combination and return to regular mode the Auto Seek function will be the selected feature Channel Lock Out Sub Mode Functionality Diagram Use this chart to help with navigating through and adjusting the channels active within the Channel Lock Out Sub Mode Channels Navigating within the Channel Lock Out Sub Mode Receiver LED Display Shows Active Pressing the Select Button Pressing the Power Button 3 3 13 3 8 2 3 3 1 2 3 5 Advances to the next Saves the selected channel s active 4 channel s active combination and returns to regular combination program mo
14. fication 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 The receiver shall have a SNR of 60 dB or greater and have built in squelch control The device shall have an audio frequency response of 63 Hz to 15 kHz 3dB and shall have distortion of less than 2 The device shall operate for 30 hours with two AAA alkaline batteries and 15 hours with two AAA NiMH rechargeable batter ies The receiver shall be covered by a limited lifetime warranty The LR 42 is specified Specifications LR 42 Selectable 2 3 MHz 2 8 MHz 3 3 MHz 3 8 MHZ Number of Channels Four 4 selectable channels 005 stability O to 50C All system specifications are wireless end to end System Frequency Response 63Hz 15kHz 3dB System Signal to Noise Ratio Mono gt 60dB Audio A weighted Stereo gt 52dB System Distortion lt 2 total harmonic distortion THD Audio Output Jacks 3 5 mm connector unbalanced mono or stereo headphones Audio Output Power 20 mW maximum at 32 ohms once User Controls Volume Power Channel Select ontrols Channel Lock Auto Seek Channel Lock Out Squelch ene Indicated by current channel selection LED ndicators Channel Selection Red LED illuminates on
15. il the LED s show 1 2 3 Using the chart on a previous page note that this is the Auto Seek Function 6 Again note that the channel 4 LED indicates whether this function is on off Press the power button to turn Auto Seek on off 8 Exit Program Mode Programming Examples Example 3 I want to lock out channels 2 and 3 using the Channel Lock Out Function 1 Enter Program Mode 2 When program mode is entered the first function is active and the LED s will show 2 3 1 Using the functionality chart on a previous page note that this is the Stereo On Off Function 3 Press the Select button once so the LED s show 2 1 Note that this is the Channel Lock Out function 4 Press the Power button to enter the Channel Lock Out Sub Mode Upon entry to the Channel Lock Out Sub Mode the LED s will show which channels are currently active if the unit is at default settings all four LED s will be on indicating that all channels are active Press the Select button to scroll through the 15 possible combinations of active locked out channels until the unit displays 8 2 3 4 Press the Power button to save this setting and return to regular program mode 8 Exit Program Mode Example 4 I want to reset the unit to factory defaults 1 Enter Program Mode 2 When program mode is entered the first function is active and the LED s will show 1 Using the functionality chart on a previ
16. ith two AAA NiMH rechargeable batteries The receiver Shall be covered by a limited lifetime warranty The LR 44 is specified Specifications LR 44 All system specifications are wireless end to end weighted User Controls Volume Power Channel Select Controls Channel Lock Auto Seek Channel Lock Out Squelch Indicated by current channel selection LED Indicators Channel Selection Red LED illuminates on the current channel selection Battery Type Two 2 AAA alkaline batteries or NiMH battery pack Battery Life 30 hours alkaline 15 hours NiMH rechargeable pack LA 364 Battery Charging Up to 9 hours Fully Automatic with NiMH battery pack and LA 350 charger Grey with White Silk Screening Unit Weight without batteries 1 75 02 49 g Unit Weight with batteries 2 55 oz 74 g Dimensions H x W x D 1 80 x 4 00 x 0 75 in 46 x 102 x 19 mm Physical Shipping Weight 8 00 oz 227 g Temperature Operation 10 C 14 F to 40 104 F Environmental Temperature Storage 20 C 4 F to 50 122 F 0 to 95 relative humidity non condensing Specifications are subject to change without notification i 5 6 LR 42 Quick Reference Stetho Arms LR 42 model only Speakers located in ends of stetho arms place in ears to listen to audio Channel Indicator LEDs Displays which channel the unit is currently tuned to Also can display battery level etc Volume Control Dial Use to adj
17. l not change channels when the signal is lost Also if there are channels that have been locked out in the Channel Lock Out mode the Auto Seek will not stop on these channels See page 19 for more information 15 LR 42 44 Operating Instructions 6 Adjust Volume Level Use the control dial on the top of the unit to adjust the volume to a comfortable level Ka Checking Battery Level and Current Channel Checking Battery Level o 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 Then the LEDs will ramp down to the current battery level If all four LEDs turn on and remain on the batteries are full E The battery level will then display on the channel indicator LEDs for two seconds unless battery level is less than about 5 in which first LED will flash for five seconds Each lit channel indicator represents approximately 25 of the battery s capacity see chart below g g LED on gt gt 76 100 LED off 51 75 26 50 5 25 Less than 5 16 LR 42 44 Operating Instructions 4 8 Checking Current Channel The channel the unit is currently on is represented by the corresponding LED in the channel indicator LEDs being lit unless unit is in LED sleep mode To check which channel the unit is on without changing the current channel while the unit is in LED sleep mode press either the PWR or Select button
18. 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 only 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 gov erned 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 90 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 tha
19. need to be replaced Compliance Warranty and Contact Information Compliance Information The following compliance information applies to the LT 82 LA 140 GY LA 140 WH LR 42 LR 44 and LA 350 This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation This Class A digital apparatus complies with Canadian ICES 003 C These devices are ROHS compliant Warranty 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 Listen warrants its Stationary IR Radiators LA 140 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 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 its 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 350 to be free from defects in workmanship and
20. ns is covered or obstructed the receiver will have very poor range 12 LR 42 44 Operating Instructions PAN 1r42 Position the receiver so the stethoscope arm tips rest in the ear holding the unit below the chin of the user BE LR 44 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 unit closer to the user s chin To increase the size of the lanyard loop pull on the lanyard cord above the point it passes through the receiver 13 14 LR 42 44 Operating Instructions 3 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 3A Auto Seek Disabled Default OFF The unit will power up to the same channel that it was on when it was last turned off 3B Auto Seek Enabled The unit will power up to the same channel that it was on when it was last turned off If no signal is present on that channel it will seek for a channel with signal present If none is found it will continue seeking until it finds a signal Note that if the unit has been locked on its channel this lock will
21. of unit using the following process purchase Listen Technologies part number LA 363 o Remove alkaline battery compartment Press down on compartment and push towards the bottom of unit CE 0682 T Model 4 Chani Mel Rec FCC This device complie es wih Pa pide li FCC Rules IC This Clas ss A digital tal a mplies with Canadia n ICES 003 isten Suppo ort 800 om 0891 aot 233 8992 w pi Open battery compartment Open by pulling into two pieces using the grips on the top of the compartment Grips E Install batteries Insert two AAA alkaline batteries in noting polarity m Close battery compartment Snap the two compartment pieces back together ig Return battery compartment to rear of receiver Place battery compartment on rear of receiver LR 42 44 Setup Instructions 2B Rechargeable NiMH batteries To use rechargable NiMH batteries in the receiver you will need to purchase an NiMH rechargeable battery pack Listen Technologies part number LA 364 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 Technologies provided sealed battery pack LA 364 for battery charging Install LA 364 battery pack using the following process a Remove alkaline battery compartment Remove alkaline battery compartment by pressing down on compartment and pushing towards the bottom of unit Store alkaline batter
22. once This will turn the channel indicator LEDs back on for 10 seconds 8 Auto Shut Off Feature The receiver will automatically turn off in the two following situations EA 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 2 After 30 minutes After 30 minutes if no signal is detected by the receiver both models 9 Powering down the unit To power down the unit press and hold the PWR button for 1 5 seconds All of the LEDs will light up momentarily and then turn off signaling power has been shut off 17 18 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 Channel Lock Procedure The unit can be electronically locked on the channel it is currently on using the following process Ey Select the channel that you want to lock the unit on Wait until the unit enters LED sleep mode LED sleep mode begins when the unit extinguishes the channel indicator LED which will happen 10 seconds after the last button is pressed e Once in
23. ous page note that this is the Stereo On Off Function 3 Press the Select Button five times until the unit displays 2 3 1 Z Press the Power Button to reset the unit The unit will flash the four LED s three times and then shut down It will be necessary to manually turn the unit back on after a reset l 25 26 Programming Examples Example 5 I want to tighten the squelch setting to setting 10 Enter Program Mode 2 When program mode is entered the first function is active and the LED s will show P 3 1 Using the functionality chart on a previous page note that this is the Stereo On Off Function EA Press the Select button three times so the LED s show 2 3 1 Note that this is the Squelch Adjustment Function 4 Press the Power button to enter the Squelch Adjustment Sub Mode Upon entry to the Squelch Adjustment Sub Mode the LED s will show which squelch setting is currently selected if the unit is at default settings the unit will display representing a squelch setting five 2 3 4 1 6 Press the Select button to scroll through the 16 squelch settings until the unit displays U 2 3 4 1 Press the Power button to save this setting and return to regular program mode Exit Program Mode 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 receive
24. press the power button EA The unit will flash the channel indicator LED s three times and then shut down when reset Exiting Program Mode There are two ways to exit the program mode E Wait 10 seconds without pressing a button any changes made are saved 2 Use the Select button to scroll through the program mode functions until the Exit Program Mode function is selected and then press the Power button 23 24 Programming Examples Example 1 I want to turn on off the Stereo Mode function and then exit program mode i Enter Program Mode see page 19 2 When program mode is entered the first function is active and the LED s will show 1 2 3 Using the functionality chart on a previous page note that this is the Stereo On Off Function EN Note that the channel 4 LED indicates whether or not this function is on off 4 Press the power button to turn Stereo Mode on off 5 Exit Program Mode Example 2 I want to turn on off the Stereo Mode function and the Auto Seek Function and then exit program mode 1 Enter Program Mode A When program mode is entered the first function is active and the LED s will show 2 3 1 Using the functionality chart on a previous page note that this is the Stereo On Off Function EN Note that the channel 4 LED indicator represents whether or not this function is on off 4 Press the power button to turn Stereo Mode on off 5 Press the Select button two times unt
25. r 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 Channel Lock Out Default is All Channels Available Channel Lock Out function This function is used to lock out channels from being accessible to the user when the Select button is pressed or when the unit is seeking for a channel in Auto Seek Mode This function is different from the Channel Lock function in that this function removes channels from being selectable whereas the Channel Lock function holds the unit on the current channel By using this program mode you can lock out any combination of channels When to Lock Out Channels If you have Auto Seek disabled default setting the unit scrolls to the next channel with each press of the Select button If for example you have a two channel system you can use this feature to lock out the other two unused channels so that the user will not have to scroll through them to get to the channels with a signal If you have Auto Seek enabled and are using less than four channels you can use the Channel Lock Out mode to ensure the receiver will not stop on a channel without a signal If for example you are using Auto Seek Mode and have two channels active channels one and four and find that often times when the unit
26. rphone The squelch on your receiver can be adjusted so that it will mute at varying levels of signal strength There are 16 settings that the squelch setting can be set to The lowest squelch setting no squelch is O and the tightest squelch setting is 15 The default setting is 3 When to Adjust Squelch Setting For maximum range the squelch setting should be set to a low level 0 1 or 2 However when setting the squelch level low the reliability of the squelch setting is compromised and will lead to radio noise being heard in the earphone when signal strength is low If no radio noise is desired to be heard the squelch setting should be set to a tighter position However when setting the squelch level high the receiver will have reduced range due to the audio being cut off when signal is low See Programming Unit section for instructions on how to adjust squelch setting 27 Accessories for LR 42 44 Accessories LA 152 LA 364 LA 150 IR Alkaline battery compartment NIMH Rechargeable Battery Pack Replacement Lanyard for LR 44 included with receiver requires LA 350 Charging Station stom LA 350 LA 35 1 LA 161 LA 15 8 Unit IR Receiver 8 Unit IR Receiver Storage Station Single Ear Bud Replacement Ear Tips Charging Storage Station Pkg of 20 LA 364 required LA 164 LA 165 LA 166 Earspeaker Stereo Headphones Neck Loop 28 Stationary IR LA 350 8 Unit IR Receiver Charging Storage S
27. t 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 Contacting Listen If 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 50m Mountain Time 14912 Heritage Crest Way Bluffdale Utah 84065 4818 801 233 8992 1 800 330 089 1 North America 801 233 8995 fax support listentech com www listentech com 39 40 LISTEM TECHNOLOGIES Listen Technologies Corporation 14912 Heritage Crest Way Bluffdale Utah 84065 4818 U S A 1 801 233 8992 1 800 330 0891 North America 1 801 233 8995 fax www listentech com Printed in the United States of America 2015 Listen Technologies Corporation All Rights Reserved 20150709 41
28. tation LA 351 8 Unit IR Receiver Storage Station LISTEM 2015 Listen Technologies Corporation All Rights Reserved For further details regarding use adjustment or programming of your Listen Technologies products visit our website at www listentech com support manuals or contact us at 1 801 233 8992 or 1 800 330 0891 29 LA 350 Package Contents e LA 350 Charging Storage Station e LA 204 Power Supply e Battery Pack Conversion Trays 8 e Cord Tidy Rack e LA 350 Quick Reference Card Zz a Battery Pack Conversion Trays LA 351 Package Contents e LA 351 Storage Station e Cord Tidy Rack Zz Oe Listen Configurations LA 350 01 North America e LA 350 02 UK e LA 350 03 Euro 30 LA 350 Specifications Features e Can charge or store up to eight LR 42 and or LR 44 receivers at one time e Easy to identify charging Green LED fully charged units Red LED charging in progress e Pockets grab and hold receivers so they will not fall out e Charging Storage Station can be mounted on a flat surface or on a wall e 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 e Lanyard cords are stored without tangling with use of Cord Tidy Rack Specifications LA 350 Compliance RF Safety Compliance FCC Industry Canada CE ROHS Bicolor LED Red when charging Green when charging
29. the current channel selection Battery Type Two 2 AAA alkaline batteries or NiMH battery pack Battery Life 30 hours alkaline 15 hours NiMH rechargeable pack LA 364 Battery Charging Up to 9 hours Fully Automatic with NiMH battery pack and LA 350 charger Dimensions H x W x D 1 8 x 4 0 x 75 in 46x102x19 mm Stethoscope Arm length 8 in 203 mm Physical Unit Weight without batteries 1 75 oz 49 g Unit Weight with batteries 2 55 oz 74 g Shipping Weight 8 00 oz 227 grams Temperature Operation 10 C 14 F to 40 104 F Environmental Temperature Storage 20 C 4 F to 50 122 F 0 to 95 relative humidity non condensing Specifications are subject to change without notification LR 44 Lanyard IR Receiver Specifications Architectural Specification 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 The receiver shall be capable of receiving a stereo signal on each of the four carriers The receiver shall have a SNR of 60 dB or greater and have built in squelch control The device shall have an audio frequency response of 63 Hz to 15 kHz 3dB and Shall have distortion of less than 2 The device shall operate for 30 hours with two AAA alkaline batteries and 15 hours w
30. ust volume level in speaker s IR Receiver Lens Lens covers the IR receiving components ensure entire lens is visible during use Power Button Press to turn unit on press and hold to turn unit off Select Button Press to change the channel also used with programming function LR 44 Quick Reference Lanyard LR 44 model only Holds receiver in place below chin of wearer Channel Indicator LEDs Displays which channel the unit is currently tuned to Also can display battery level etc IR Receiver Lens Lens covers the IR receiving components ensure Volume Control Dial entire lens is visible during use Use to adjust volume level in speaker s f Power Button Press to turn unit on press and hold to turn unit off Select Button Press to change the channel also used with programming function Lanyard Adjustment Ball LR 44 model only Adjust the loop size of the lanyard by pulling on this ball usually done after unit is on user s body Headset Jack LR 44 model only Accepts any earpiece with a 3 5 mm TRS connector 7 LR 42 44 Setup Instructions EN Unpack the Product Remove outer packaging and plastic cover Verify all components are present and that no physical damage has occurred to the product 2 Determine Battery Type to be Used Alkaline Batteries If using alkaline batteries install them in alkaline battery compartment attached to rear
31. y into program mode Immediately after the LEDs flash the channel one LED will come on This represents the first of the programmable features the Stereo On Off function While in Program Mode The Channels 1 2 and 3 LED indicators are used to display which programmable feature is currently selected The Channel 4 LED indicator shows whether the Stereo On Off and Auto Seek features are enabled or disabled If the Channel 4 LED is on these features are enabled 3 Press the Select button to advance to the next program mode feature 4 Press the Power button to 4A Enable or disable the Stereo On Off and Auto Seek Features or 4B Enter the program sub mode required to adjust the Channel Lock Out and Squelch features 19 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 Navigating within the Program Mode Programmable Receiver LED Display Shows i Feature sa bel M Pressing the Power Button Select Button g P Toggles Stereo On Off LED 4 Stereo On Off gt x Advances to Feature 2 illuminated indicates stereo is ON default off Enters Channel Lock Out Channel Lock Out gt 3 Advances to Feature 3 Sub Mode See next page for instructions Toggles Auto Seek On Off LED 4 B illuminated indicates Auto Seek Advances to Feature 4 Auto Seek ic ON default off Enters Squ
32. y pack for later use if desired CE 0682 Model 4 Channel IR Receiver FCC This device complies with Part 15 of the FCC Rules is Class A digital apparatus complies with Canadian ICES 003 Listen Support 800 330 0891 801 233 8992 www listentech com 2 Place LA 364 battery pack in receiver Place LA 364 battery pack in receiver The unit will now recognize the rechargeable batteries and charge them correctly when unit is placed in a charging case LA 350 CE 0682 kya IR Recei eiver FCC This device complies with Part 15 of the FCC Rules complies wi IC This Class A digital apparatus lies with Canadian ICES 003 Listen Support 800 330 0891 801 233 8992 www listentech com To charge refer to charging section i 9 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 Technologies receivers Make sure to push the connector all the way into the jack Turn Unit On Turn the unit on by pressing either button on the front of the unit 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 10 LR 42 44 Setup Instructions Select
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