LR-400/500 Operating Instructions
Contents
1. LT 800 863 Quick Reference Input Level Indicators Shows audio Input 1 and Input 2 levels Mix Audio Level Shows mixed level Input land 2 Adjust audio input levels of Input 1 mode is active and Input 2 here Process LED Indicates audio processing Monitor ack Plug ina headset to monitor audio O Test Tone Activates a CD Display O Channel Select tone to aid system setup See LCD display quick Up and Down reference Use to select O Power ON OFF Contour Equalization channel adjustment boostsor Buttons also cuts high frequencies oe O Power Input Connect power O Mix level Adjusts mixed functions audio levels e Audio Outputs Input 1 and supply included here input 2 mixed audio outputs Input 2 Unbalanced Audio inputs stereo or e Input 2 Level Switch Set switch to match the level of your Input 2 source mono RF Power Level Low med or high RF power RF Antenna Input 1 Level Switc h O utput BNC Set switch for line or connectorfor mic level Phantom antenna 50 ohm poweravailable in RF Output Indicator Mic PH power Indicates transmitter position is outputting RF 9 Program Mode Indicates the unit is in program mode 9 Channel Display Displays what channel the LT 800 is currently on Lock Icon Indicates the unit is locked on current channel Input 1 Balanced2. issa single sound Stationary FM Design Guide Table of Contents Table of Contents 3 E Technology Overview 5 A System Overview 6 3 Key Conceptsin Designing an FM System 8 D Notes 17 Frequency Modulation FM Technology Overview Frequency modulation or FM isa meansof transmitting audio using electromagnetic waves This same technology is used by local FM radio stationsto broadcast music FM signals can travel through most barriers walls floors and ceilings The distance a signal travels has many different variables such as Radio Frequency RF output power the type and placement of the antenna and the broadcasted frequency Unlike infra red FM transmission are not secure This enablesa receiverto travel further distances from the source This section of the manual willhelp you design a system that will get the best range and least amount of interference A W G E o M FM Receiver Audio Source FM Transmitter When designing an FM system it is important to keep the following in mind e Multipath Multipath interference isa form of RF interference that occurs when radio signals have more than one path between the receiverand the transmitter causing the two RF signalsto add out of phase Thiscould occurin areas with RF reflective surfaces such asfumiture walls or floors The result of multipath isthe receiveraudio coming in and out of squelch when the receiver is moved Portable appli
3. Q S Q SU uU A Key Concepts in Designing a Statonary FM System Selecting Transmitting Frequencies Use this section of the guide to choose the channel settings for the transmitter and receivers Find transmission channel s The goal isto find a transmission channel s that is free from interference Interference comes from other transmitters and from other equipment such asa computer Listen s LT 800 863 offers 17 different channels to choose from Listen s LT 800 863 offers 17 different Channels to choose from This increases the chance you ll find an interference free channel The best way to check for interference isto tum a receiveron and pressthe SEEK button If there are any channels with interference the receiver will find these channels Do not transmit on these channels Testing System Monitor Jack The headphone jack is used to monitor the mix of input 1 amp 2 You can adjust the monitor level with the volume knob The headphone jackisa standard 3 5 mm jack LLL Headphone e monitoring jack Test Tone Use the test tone to transmit a 400 Hz tone Thistone will allow the end userto know if the system istransmitting properly All receivers should be able to hearthistone if tuned to the proper channel ho U rest TONE Test Tone Buttone 10 Key Concepts in Designing a Stationary FM System Antenna placement rear or remote Rear mou
4. o I Listen Stationary FM 863 MHz LLL e www listentech com stationary FM System Design Guide and Manual iss a single sound DearValued Customer Thank you forchoosing Listen Allof usat Listen are dedicated to providing you with the highest quality products available We take great pnde in their outstanding performance because we care that you are completely satisfied That s why we independently certify them to the highest quality standardsand backthem with a limited lifetime guarantee We stand ready to answerany questions you might have during installation orin the operation of our products Should you experience any problems whatsoever with your Listen products we are ready to help you in any way we can with prompt efficient customer care Because at Listen it s all about you And should you have any comments on how we might improve ourproductsorour service we re here to listen Here show to reach us 1 801 233 8992 1 800 330 0891 North America 1 801 233 8995 Fax support listentech com www listentech com Listen Technologies GmbH J asminstr 16 905 22 Oberasbach Germany 49 911 955159 O Tel 49 911 955159 40 Fax www listentech de info listentech de Thank you and enjoy your listening experience Best regards Russell Gentner and the Listen Team Lifetime Wananty the bestin the business Listen s full time technical support is passionate about what they do and you can depend on them to solve a
5. T e NiMH 2 AA Batteries ALkaline or NIMH POWER c PA Qof ANTENNA l RF denha Companding O de modulation P Q Technology VOLUME Tip O PA 3 5 mm Connector Sleeve O lt Ring Articulating Flexible Antenna e Power Charging Port e Front DoorLocke Channel Select Buttons e LR 400 863 Quick Reference e 3 5 mm Output Jack Connect a listen earpiece here LED When lit indicates unit has power e On Off and Volume Control Dial Look amp Listen Display Shows uu receive level channel battery Status and lock status SEEK Button Allows the em userto change channels Naa Geek orlockona channel SELECT rm O Battery Select Switch Choose the type of battenes being used Battery Compartment Place 2 AA battenes in compartment Be sure to follow polanty pattem Channel Displa y Displa ysthe channel the LR 400 is currently on e RF Input Indicator e Indicatesthe RF receive le vel 0 e CH a Listen aA 1 Ll ta Battery Level Indicator O Lock Icon Indicates the unit is locked on current channel 48 LR 500 863 Quick Reference Articulating Flexible Antenna Power Charging Port e Front Door Locke Channel Select Buttons e Channel Displa y Displa ysthe channel the LR 500 is cumently on e RF Input Indicator e Indicatesthe RF receive lien level pen ust a wia U iE 0 3 5 mm Output Jack
6. A Lh y Listen run MONITOR a a loch a MIX LEVEL COUNTOUR Pme TEST TONE CHANNEL CES ECT LT 800 863 Stationary FM Transmitter iss a single sound LT 800 Users Manual Table of Contents Specifications 25 Block Diagram 26 Quick Reference 27 Setup Instructions 28 Operating Instructions 30 Accessories 34 Notes 3 LF 800 863 Package Contents e LT 800 863 e Quick Reference Sticker e LA 129 90 Artic ulating Antenna e 12 VDC Power Supply e Line Cord e Quick Reference Card e Warranty Card e Manual Card a LA 129 90 Articulating Antenna 863 MHz 12 VDC Power Supply Listen Confgurations e LT 800 863 01 North America e LT 800 863 02 Asia UK e LT 800 863 03 Euro LT 800 Specifications Architectural Spec ification The Stationary FM Transmitter shall be capable of broadcasting on 17 channels Channel tuning shall be capable of being locked The transmitter shall have a SNR of 70 db orgreater The output power shall be adjustable to quarter half or full The device shall have an audio frequency response of 50 Hzto 15 kHz 3 db It shall have 2 mixing audio inputs and a mixed signal output The device shall have the following audio controls Input Levels Mix Level adjustable low pass filter Contour headphone output monitor The device shall have an audio processorthat is capable of automatic gain control and limiting The Listen LT 800 863 is spec ified Specificat
7. Audio Input 1 sounds tinny If you are using an unbalanced audio source make sure Pin 3 on the XLR orthe ring on the Y plug is grounded cannot pick up the signal on the receiver Checkto make sure the receiverand the transmitter are on the same channel Make sure the LT 800 has an antenna connected Ensure that the receiver hasthe antenna pointed upward I can pick up the signal on the receiver but it sounds like it s not tuned in Checkto make sure the transmitter and receiverare on exactly the same channel It sa good idea to lock the channels once they have been set To lock the LT 800 press the UP button for 3 seconds To Lockreceiveron a channel hold the seek for 3 seconds There is not sufficient range First make sure that the receivers you are using are operating properly then make sure that you have an antenna connected eitherto the top of the LT 800 transmitter or connected to the back of the unit but not both The antenna should be ashigh aspossible and free of obstacles In addition make sure you are using the correct antenna type for your unit You might want to use a remote antenna LA 130 Remote Antenna Kit 863 MHz that can be mounted on a mastor wall Try using different frequenciesto find one with less interference please referto design guide 3 pl 2 3 D g lt gt y o o o a 72 Troubleshooting Troubleshooting There is interference in my transmission Ensu
8. Connecta listen earpiece here e LED When lit indicates unit has power e On Off and Volume Control Dial Look amp Listen Display Shows receive level channel programming battery status and lock status SEEK Button Allows the userto change channels orlockona channel Battery Select Switch Choose the type of battenes being used Battery Compartment Place 2 AA battenes in compartment Be sure to follow polanty pattem ET Mon Level Indicator Lo vane in programming Program mode the u channel has function is in O been locked out process Lock Icon Indicates the unit is locked on current channel 49 LR 400 500 Setup Instructions py Remove the product Remove outer packaging and plasic cover Inspect for physical damage If damage isapparent please contact the dealer from which the product was purchased or Listen Technologies Corpora tion technical support for assistance referto page 67 for contact information 2 Open the front access door If locked use a pocketknife orsmallscrewdriverto unlock the doorlockson both sides of the unit To unlock the door rotate the lock tum counterclockwise Grip the two tabs with your thumb and index finger and pull the door downward DO NOTplace batteries in the unit at this time NNEL pe sace o x BATTERY 3 Select Battery Type Two typesof battenes may be used The unitisshipped with th
9. SEEK button again The unitmay stop on a channel that is close to the actual broadcast channel in which case the channel will sound noisy or distorted Simply press SEEK again until you find the clearest operating channel 4 Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level 54 LR 400 500 Operating Instructions Locking the Receiver on One Channel The unit can be electronically locked on one channel so that it will not change channels even if the SEEK button is pressed It is recommended to lock the receiveron a channel that is being used in a single channel system or when mul tiple systems are in the same area EN To lock on a channel m Press and hold the SEEK button for 5 seconds Press and hold the SEEK button for 5 secondsto lock a receiver onto the currently tuned channel Press and hold the button again to unlock When locked the LED on top of the unit will flash when you pressthe SEEK button NOTE On the LR 400 500 when the channel is loc ked a lock icon will appear undemeath Listen on the display Also if the unit is locked the red LED on top ofthe receiver will flash when the SEEK button is pressed LR 400 500 Operating Instructions Squelch Programming Entering Squelch Program Mode E Tum unit off Press and hold the SEEK button while holding SEEK button down tum the ON O FF VO LUME dial to tum the uniton B
10. XLR or 1 2 phono connector Input 2 hastwo unbalanced mixing phono connectors Use Input 1 if you are using a microphone orif you have a balanced connection such asfrom a professional audio mixer you can also use Input 1 forunbalanced connections Use Input 2 to connectto an unbalanced audio source 6A Input 1 Connect the audio source s to one or both audio input connections Input 1 offersa choice of balanced XLR or Y4 phono connector Plug your microphone into Input 1 and move the input select switch to Mic for dynamic microphones or Mic PH Power for condenser microphones Plug yourbalanced or unbalanced audio source into Input 1 Use the following diagram 1 4 Phone Wiring Balanced Unbalanced Tip Ring Sleeve E md Balanced Unbalanced Audio from Audio Audio Source Source Top Ring Sleeve Balanced Unbalanced Audio Audio Source Source 6B Input 2 Plug yourunbalanced audio source into Input 2 and select the audio level switch for 10 dBu or 10 dBu to match the audio level coming from your equipment 29 LT 800 Operating Instructions EN Power Unit On P gt gt 4 L L mix LEVE ton PU Listen ur Power Button e 2 Select a Channel Select the transmit channel by pressing the channel select UP and DOWN buttons ms Channel select up and down buttons powER Lock on Channel Once you detemine yourtransmit channel
11. and Contact Information 75 Notes 7 6 Lo G B 3 O B lt Te AAA nn E 67 Battery Charging Information The Listen receivers are unique because they have SmartCharge chargers built in When any of these units are placed into a Listen charging case NiMH batteries will be charged SmartCharge uses a pulse charging which greatly extends the life of Nickel Metal Hydride NiMH batteries The entire charging process takes about 13 hours Listen recommendsthat you allow the chargerto complete its full cycle every time for maximum battery life During the charge cycle the red LED on top of the Listen product will fla sh sowly When charging is completed the LED will tum off It is not necessary to unplug the charger however if you unplug the unit from the charger and then plug it back in it will begin the 13 hour charge Cycle overagain show top of a receiver LED When not using the receiver it is recommended to leave the unit on the charger The charger providesa maintenance charge that keepsthe battery at 100 If the unit is not on the charger the battery will lose up to 20 of its charge per month NOTE Listen provides 2300 mAH milli Amp hour constant current NiMH Nic kel Metal Hydride batteries These may be purchased from Listen part number LA 362 Charging with a drop in charger To charge the batteries using a drop in charger simply place the unit into a slot in the chargerand con nectthe chargerto
12. com Listen Technologies GmbH J asminstr 16 905 22 Oberasbach Germany 49 911 955159 O EMEAI 49 911 955159 40 Fax www listentech de info listentech de Printed in the United States of America O 2008 Listen Technologies Corporation All Rights Reserved 20080129
13. menu Press and hold power for 2 seconds This exits the program mode When in a programming function Press and hold powerfor 2 seconds This exits the function and goes back to the programming menu 3c Pressing and holding power fora full 4 seconds will exit both programming function and programming menu 59 60 Accessones for LR 400 500 Accessones LA 164 LA 165 Ear Speaker Stereo Headphones Behind the Head Assistive Listening Stereo Headphones Notific ation Signage Kit LA 311 16 Unit Portable Charging Canying Case LA 313 16 Unit Porta ble Canying Case LA 317 4 Unit Portable Charging Canying Case LA 318 4 Unit Portable Camying Case LA 320 Configurable Carrying Case LA 321 8 Unit Portable Charging Canying Case LA 322 8 Unit Portable Camying Case LA 323 4 Unit Portable Charging Canying Case w Removable Lid LA 324 8 Unit Portable Charging Camying Case w Removable Lid LA 325 16 Unit Portable Charging Carying Case w Removable Lid LA 166 Neck Loop LA 361 High Capacity AA Alkaline Batteries 2 Rechargeable AA NiMH Battenes 2 Notes 61 Notes 62 Oo u E Listen Stationary FM 863 MHz mica d 0 www listentech com supplementary Information iss a single sound Supplementary Information Table of Contents Battery Charging Information 69 Frequency Chart 70 Troubleshooting 71 Frequently Asked Questions 73 Compliance Warranty
14. power Make sure the unit is fully seated in its slot IMPORTANT DO NOT ATIEMPTTO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH NICKEL METAL HYDRIDE with your Listen equipment Alkaline battenes may explode when connected to a charger Other risks of charging non NiMH batteries include destruction of property orfre IMPORTANT In order to charge NiMH batteries the BATTERY SELECT switch in your Listen product must be set to the NiMH setting Use a pen or small screwdriverto move the switch located in the battery compartment to the proper position WARNING The case lid MUST be open or removed while the units are charging The charging process generates heat Air ventilation is required It is best to store your charging case atroom temperature away from heat sources and direct sunlight ee SO oo oO EE ee M RQ 69 3 pl 2 3 D g lt Frequency Chart Frequencies Channel Frequency MHz 863 050 863 200 863 400 863 550 863 750 863 900 864 100 864 250 864 450 864 600 864 800 864 950 863 300 863 650 864 000 864 350 864 700 gt d o o o a nn 71 Troubleshooting Troubleshooting The LF800 has no power Make sure the 12 VDC powertransformer is connected to a power source and isconnected to the jack marked Power Input Make sure the POWER button is pressed in There is no audio or the audio level is too low 1 Make sure that your audio source is properly connect
15. signal strengths This is useful as follows Squelch Setting Set the squelch setting to the highest level To ensure that users don t heartra nsmissions from other transmitters set the squelch setting to the highest level that po doesn t squelch the receiver If the receiver is close to the transmitter set the squelch high dm default y gt jonbg on If the receiver is going to be close to the transmitter i e in a classroom set the squelch setting high so that when the transmitter is tumed off it immediately squelches and ignores transmitters in other rooms obuey Kon yajanbs 8500 If in an area that has a lot of interference set the squelch high If you are in an area that has a lot of inference you may want to set the squelch setting to a high setting to ensure the interference isnot picked up by the receiver For maximum amount of range set the squelch to a low level If you need the maximum amount of range you may want to consider setting the squelch setting to a low level 0 1 or 2 NOTE Default squelch setting is 3 CAUTION When setting the squelch level low the reliability of squelch function is compromised This will cause radio noise to be heard in the earphone and there is a possibility of hearing damage 1 2 3 4 5 7 10 11 12 13 14 15 16 17 18 19 20 obuey 35237 y n bs 1y DUL 57 58 LR 400 500 Operating Instructions DX Local DX isthe normal operational m
16. the audio source s to one or both audio input connections Input 1 offersa choice of balanced XLR or 4 phono connector Plug your microphone into Input 1 and move the input select switch to Mic for dynamic microphones or Mic PH Power for condenser microphones A feed from a soundboard can also used with Input 1 Be sure the input type selected line mic or mic PH PWR matches with the output type The following isa wire diagram for Input 1 balanced and unbalanced connections 1 4 Phone Winng Unbalanced R NN Input from P di p in Top Ring Sleeve Audio from Balanced Unbalanced Aud IO Audio Balanced Unbalanced Audio Audio Source Source Source Source Key Concepts in Designing a Stationary FM System Input 2 Connect the audio source s Plug your unbalanced audio source into Input 2 and select the audio level switch for 10 dBu or 10 dBu to match the audio level coming from your equipment A W G E o M Using Two inputs The LT 800 can accommodate two inputs simulta neously with the use of the input level potentiometer When two inputs are present both sets of input level lights will be activated ZEILE 2 gest TONE quo Input Level Knob e Mix Level The mix level acts as the master transmit control It will increase the transmit gain on the mix of the two levels if two levels are in use TEST poweR Mix level adjustmente
17. you can lock the transmitter on that channel To locka channel hold the Channel Select Up button for 3 seconds until the padlock icon appearson the display To unlock repeat this process and the padlock icon will disappear 30 LT 800 Operating Instructions E Test Tone if necessary Use the test tone to transmit a 400 Hz tone Thistone will allow the end userto know if the system is transmitting properly All receivers should be able to hearthistone if tuned to the properchannel ieri powER Test Tone Buttone Adjusting Audio Levels Adjust Audio Input Level Adjust the input knob counterclockwise to add gain to Input 1 This will decrease gain to Input 2 Adjust input knob clockwise to add gain to Input 2 This will decrease gain to Input 1 If you have two audio sourcesconnected to both Input 1 and 2 adjust the level of one input using the VU meter then adjust the output level of the other audio source Adjust the input level until the left VU meters occasionally illuminate the red LEDs Illumination of the red LEDs indicates the unit is in limiting Limiting is required so that the unit does not over modulate the transmit signal If you don t want any audio limiting to occur make sure the red LEDs never illuminate If you want a highly limited signal tum the audio gain up so the red LEDs illuminate often y INPUT lt 1 e AN e gest TONE Fan Audio Input Level Knob
18. 12 VDC Power Charging Supply for FM Portable Products LA 207 01 North America LA 207 02 Asia UK LA 207 03 Euro Assistive Listening Notification Signage Kit LA 326 Universal Rack Mounting Kit 34 Ex Design Guide Notes 35 Notes 36 Notes 37 Notes 38 e ud li Ten Stationary FM 863 MHz www listentech com LR 400 Portable Display FM Receiver LR 500 Portable Programmable Display FM Receiver iss a single sound LR 400 500 Users Manual Table of Contents Specifications 45 Block Diagram 47 Quick Reference 48 Setup Instructions 50 Operating Instructions 53 Programming Instructions LR 500 only 59 Accessones 60 Notes 61 LR 400 500 Package Contents e LR 400 500 e Quick Reference Card e Warranty Card Tin eue NNEL 40 CHEFLECT SEEN lt A BATTERY une y jMH N NNEL zs N rec ug j m LR 500 863 Portable Programmable Display FM Receiver 863 MHz p Portable Display FM Receiver P M Hz Listen Configurations e LR 400 863 e R 500 863 LR 400 863 Spec ifc ations Architectural Specification The LR 400 863 FM receiver shall be capable of receiving on 17 wide band channels with a SNR of 70 dB or greater The device shall be able to be locked on a single channel The receiver shall be capable
19. TE The antenna may need to be remote mounted using the LA 130 Remote Antenna Kit if the transmitter s is rack mounted If a rack is metal itis not recommended to have the antenna inside Also the depth of the rack and equipment inside could prevent an antenna from being placed inside The LA 131 rack mount accessory will allow you to place your LA 129 antenna at the front of the rack Having the antenna in the front will give better reception range Key Concepts in Designing a Statonary FM System Multiple Channels Guidelines for multiple channels in multiple and single spaces Example 1 A museum patron walks to an exhibit and needs to listen to one channel at a time In general such systems work very well because of what iscalled capture effect A Listen receiver will lock onto or capture the strongest FM signal If the receiver is near a dominating transmission signal it will ignore other interference even if it ison the same channel In theory you can have an infinite number of transmitters operating in thisscenano However to reduce the possibility of the receiver accidentally receiving interfering transmissions use the following guide lines e Reduce the transmission poweron the rear of the LT 800 Stationary Transmitter to the lowest level possible e Get the transmitting antenna as close to the receivers as possible Increase the squelch threshold on the receivers if necessary Choose adjacent broadcast channels
20. a personal audio source like a CD player MP3 player computer DVD etc Audio willbe Connected into the audio inputsofthe stationary transmitter o Transmitter The LT 800 transmitter modulatesthe audio on an FM camerand transmitsthe signal via an antenna 9 LA 129 System Overview Antenna There are a several optionsforantennas Antennascaneitherbe back mounted on the unitorremote mounted opin 5 ubseq LA 130 Remote Antenna Kit 863 MHz LA 129 90 Articulating Antenna 863 M Hz Included with Transmitter e f N LA 131 Antenna Kit for Rack Mount 863 MHz Receivers Listen offers two different portable receivers the LR 400 and LR 500 e LR 400 863 Portable Display FM Receiver 863 MHz LR 500 863 Portable Programmable Display FM Receiver 863 MHz Design Guide Key Concepts in Designing a Statonary FM System Input Selection The LT 800 has two audio input options Input 1 and Input 2 Input Lisa balanced connection using either an XLR or 1 phono connector and input 2 istwo unbalaned 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 con nections Use Input 2 to connect to an unbalanced audio source Balanced XLRor 1 4 phono connector Unbalanced nght and left phono connectors Input 1 Connect the audio source s Connect
21. both the transmitting and receiving antennasis critical to maximize broadcast range Eliminate or minimize obstructions between the transmitting and receiving antenna Minimize the distance between the transmitting and receiving antennas Move transmitting and receiving antennas away from metal or conductive objects Antenna Placement Place the transmitting antenna ashigh as possible The antenna should alwaysbe oriented upwards If the height of the antenna exceeds 7 6 m 25 ft the antenna should be placed with the radialfacing downward as shown in diagram Above 7 6 m 25 ft CAUTION When installing antennas ensure the antenna is Clear of power lines 12 EA gg Key Concepts in Designing a Statonary FM System Orientation Onent both transmitting and receiving antennas vertically 7 W G E o M RF Power switch Position the RF Power switch on the back of the LT 800 to full RF Power unless lower power is necessary RF Power Switch Cable Length Keep coaxial cable from transmitterto antenna asshort as possible nn 13 Q S Q O G A 14 Key Concepts in Designing a Stationary FM System Mounting Transmitter The LT 800 can be rack mounted if necessary With the use of the Listen LA 326 Universal Rack Mount Kit you can mount one ortwo transmittersto the standard 19 rack The rack mounted unit will take 1 ru of space Rack Mount with single unit installed NO
22. cations are much more susceptible to multipath than those that are stationary Multipath distortion is often worse asthe distance between transmitter and receiver increases RF power decreases Multipath can decrease the audio quality of the transmission e Antenna placement The antenna should be placed ashigh as possible and in line of sight of the receivers The antenna should not be mounted near metal objects Keeping the coaxial cable asshort as possible will also limit the loss of RF power The LT 800 comes equipped with an articulating right angle dipole antenna LA 129 The remote antenna kit LA 130 isan optional accessory The antenna on the receivers should always be in the upright position to maximize the transmission range Placing the antenna in areas where the RF cannot propeny be transmitted will limit the range of transmission Q S 5 Q O a System Overview There are fourmain partsto a Stationary FM system transmitter antenna receiver and input source LT 800 863 Stationary FM Transmitter 863 MHz process o R ee acter conTOU rans itt 3 CT is a LE 2 NEL SE n INPUT 3 puput LEVEL aun Liste e C st 10 Input source LA 129 90 Articulating Antenna 863 M Hz Included with Transmitter LR 400 863 gue LR 500 863 Portable DEDIAy FIM Portable Programmable Receiver 863 MHz Displa y FM Receiver Input Source aaa The input source can be audio from a sound board microphone or
23. e 31 LT 800 Operating Instructions 2 Adjusting the Contour knob Adjust the contour knob counterclockwise if your audio source is mostly voice Adjust the knob clockwise if your audio source is mostly music The contour knob adjuststhe relative equalization of the unit This equalization boosts or cuts frequencies above 5 kHz PROCESS CONTOUR md evel mix U LEVEL input Q rest TONE powER Contour Knob e 3 Adjust Mix Level Adjust the mix level until the right VU meter occasionally illuminates the red LED This isthe level adjustment forthe combined output from Input land Input 2 0 est TONE powER Mix Level Adjustment Knob e 32 EEE LT 800 Operating Instructions 4 Process Mode Process mode is used for Audio Gain Control AGC With the process mode enabled the LT 800 will automatically adjust for inconsistent signal input levels by raising orlowenng the signal level accordingly to provide a consistent sound output level This feature should be used in applications where a consistent sound level is important and the input levels vary substantially Typically you would not want to engage the Process Mode when a speakers emphasis Is cntical to the message they are conveying Q rest TONE powER Process Accessones for LI 800 863 Accessones A 3 LA 131 LA 13 Antenna Kit for Rack Mount 863 MHz Remote Antenna Kit 863 M Hz LA 207
24. e battery life of a receiver A 20 hours using alkaline battenes 10 hours using NiMH battenes 2 Y o o o a 74 Compliance Warranty and Contact Information Compliance Information The following compliance information applies to the LT 800 863 LT 700 863 LR 500 863 and LR 400 863 These devicescomply with ETSI EN 301 357 These devicesare CEcompliant These devicesare RoHS compliant C oHS Listen Technologies Corporation Listen warrants its transmitters and receivers models LT 700 LT 800 LR 42 LR 44 LR 100 LR 300 LR 400 LR 500 and LR 600 to be free from defects in workmanship and matenal under nomal use and conditions for the useful lifetime of the product from date of purchase Listen warrants it s Stationary IR Radiators LA 140 to be free from defects in workmanship and matenal under nor mal 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 Carmying 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 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 availab
25. e switch in the Alkaline position Use a pen orsmall screwdriverto select the battery type Ca B ATI E MNT di NiMH RS NNEL Y jc src 8 Battery select switch WARNING Do not place the BATTERY switch in the NiMH position if you are not using Nic kel Metal Hydride Batteries The NiMH position will attemptto charge any battenes in the unit even if they are not the propertype Charging non Nickel Metal Hydride NiMH batteries will result in physical harm destruction of property and or fre CAUTION If you are using any battery type otherthan rechargeable Nickel Metal Hydride NiMH batteries make sure the BATTERY selection switch is in the alkaline position 50 LR 400 500 Setup Instructions 4 Place Batteries in Unit Place two AA battenes in the compartment making note of the battery polarity shown in the battery compartment and again verifying that the BATTERY SELECT switch is in the correct position for the batteries you are using Alkaline should be selected forall battery types other than NiMH NOTE Listen provides industrial strength AA alkaline battenes part number LA 361 and high performance AA Nickel Metal Hydnde battenes part number LA 362 These may be purc hased from your Listen dealer uf isten u u ei 5 Connect an Earphone or Headset Your headset or earphone will connect to the jack on the top of the unit Either mono or stereo connectors may be used with a Listen
26. ed to Input 1 and or Input 2 The Input 1 or Input 2 switches must be in the correct position forthe appropnate input level Forexample if you are using the output of a mixer on Input 2 the switch should be in the 10 dBu position If it were to be in the 10 dBu position the level would be too low Also check the Input knob to ensure it is properly adjusted You should be able to see the VU meter deflect on Input 1 or Input 2 corresponding with the input level of the audio source You can listen to the audio source by connecting a headset to the front panel jack and adjusting the Monitor volume control 2 If the level of audio into the transmitter islow and can t be corrected using the level input switches the audio processor can be tumed on to boost the signal page 33 for descnption of Process Mode The audio is distorted Checkto make sure you have the input level select switches in the proper position You may be providing too much audio level forthe input stage to handle There is hum in the audio Make sure you have properly grounded the audio source to the LT 800 Check the connections from the audio source to the LT 800 If you can try to use a balanced audio source this will reduce the chance of creating hum Connecta ground wire from the LT 800 to ground and orto the ground of the source audio There is a tone The Test Tone button hasbeen pressed its LED light ison Push the Test Tone button to tum off the tone The
27. gramming Instructions LR 500 only Programming Instructions The LR 500 can be programmed to receive ona limited number of channels When an application requires the use of more than one channel i e a classroom or language interpretation the receivercan be programmed to view only the necessary channels Entering Program Mode 1 To enter program mode 1A While the unitisON pressand hold the channel down and up buttons simultaneously for 3 seconds 2 To program Once in the program mode a function menu is displayed Function 1 F1 is displayed as default Pressing the channel up ordown buttons will scroll through the functions F1 Pressing the seek button will enterthat particularfunction Fl Channel Lock out No channelsare locked out as default Pressing the up and down buttons will scroll through channels Pressing the seek button will toggle between available and locked out forthat channel When a chan nel is locked out the L O on the LCD shall be displayed NOTE Although it is possible to display an F2 function while in program mode there is no F2 function atthis time Listen may add another programming function in the future but there is only one programming function F1 on the 863 MHz receivers 3 When no button is pressed for 10 seconds the program menu is exited altogether regardless of whether a function is entered ornot To exit out of the program menu or function manually EN When in the programming
28. i Release the SEEK button when the Listen name disappears approximately 2 seconds and a two digit display isseen Adjusting the Squelch level 1 Use the Channel UP and DOWN buttons to raise or lower the squelch sensitivity settings referto the chart on page 49 for settings Lowernumbers mean that a less powerful and possibly noisy signal willbe heard but you can have a longerrange before the unit will squelch EJ Once the desired squelch setting is found press SEEK to exit the squelch programming mode NOTE Keep in mind low squelch may allow multipath and squelch chattering at long distances Squelch setting 00 is no squelch this setting disables the squelching capabilities of the receiver Squelch setting 20 is maximum squelch sensitivity when on this setting there must be a very strong and stable RF signal forthe unit to not engage the squelch feature NOTE For squelch settings 1 3 the squelch function is slow which allows for maximum transmission range For squelch settings 4 20 the squelch function is fast to ensure litte radio noise is heard during the squelch function 56 AAA gg LR 400 500 Operating Instructions Squelch The purpose of squelch isto mute the audio output of yourreceiver when the signal from the transmitter is tumed off oristoo weak to be received Without squelch you would hear radio noise in yourearphone The squelch on yourreceivercan be adjusted so that it willmute the audio on different RF
29. ing front panel Power Supply Power Line Cord detachable Physical 3 Ibs 2oz 1 42 kg One rack space height 1 2 rack space wide One or two transmitters can be mounted in one rack space Optional Rack mount LA 326 and LA 131 antenna kit for rack mount not included Temperature Operation 10C 14F to 40C 104F Environmental Temperature Storage 20C 4F to 50C 122F 16 959 Relative Hunidity nonondeneing Specifications are subject to change without notification Rack Mounting 25 LT 800 863 Block Diagram 115 230VAC iversi 50 60 Hz E ane a Ed C 12VDC 1 3A Power Supply CPU Module MONITOR Volume Listen LCD Display Backlit MIX Level VU Meter ANTENNA Transmitter N RF Board 4 Pre emphasis Companding En a no ape OE eo m low Functions controlled by I L N ME PROCESS CONTOUR RF POWER Compression Ratio intemal ajustment Processing MIX LEVEL Input 1 VU Meter Input 2 VU Meter en E Input Level ______ Front Panel ee a W _ _ _ _ _Input Level Select Mic Phantom Pwr Mic Line O Mic A Line Mic C O Phantom Pwr Tl H O 2 f Test Tone Button Input Level Q or 9 ON Front Panel Select Mic Phantom Pwr Mic Line Female XLR 1 4 Phono Phono Combo Connector OO ato 2 Tip 3 Ring W 1 Sleeve INPUT1 INPUT2 MIX OUTPUT TESTTONE 26 Ex
30. input for connection of a line level or microphone accepts either a XLR or LG phono plug LT 800 Setup Instructions Unpack the Product Remove outer packaging and plastic cover Venfy allcomponentsare present and no physi cal damage hasoccurred to the product 2 Mount LT 800 s in Rack if desired If rack mounting the tra nsmitter s install the optional rack mount kit part LA 326 according to the instructions included with the kit Rack Mount with single unit installed Rack Mount with dual units installed 3 Connect Antenna Connect antenna to rear of transmitter remotely or rack mount 4 Connect Power Plug the power supply into the power connectoron the back panel and then plug the power supply into an outlet Only use a Listen approved power supply 12 VDC 28 LT 800 Setup Instructions 5 Set RF power Set the RF POWER switch on the back of the unit to Full Ya or Ya Level is indicated on the LCD display by number of dots above Listen logo The amount of transmitted RF power that you will need dependson yourapplication If you are operating multiple transmitters in the same environ ment it is best to set the transmitters output power to its lowest level to reduce the possibility of interference 008 1 e low med orhigh RF power Be a 2 R 1 j 6 Connect Audio Inputs The LT 800 hastwo audio input options Input Land Input 2 Input lisa balanced connection using eitheran
31. ions LT 800 863 System Frequency Response 50Hz 15kHz 3 db System Signal to Noise Ratio 70db A Weighted lt 2 THD 80 modulation Rear Panel Female XLR and 1 4 in combo connector balanced 0 55 dBU line mic nominal input Audio Input 1 level adjustable 30 21 dBU line mic maximum input level impedance 20k 1k ohms line mic phantom power 12VDC E Rear Panel 2 Phono Connectors unbalanced 10 10dbu nominal input level adjustable 30 dBU Audio Input 2 e maximum impedance 100K ohms Audio Processing Process Compression can be turned on off Slope internally adjustable from 1 1 to 4 1 Default 2 1 Cuts and boosts frequencies above 5kHz Caraca alo OE RE ES Input 1 and Input 2 Mixed Output Rear Panel 2 phono connectors unbalanced 10 dBU nominal output level 19dbu maximum impedance 10 ohms Front Panel One 3 5 mm stereo connector unbalanced adjustable output level 7dbu maximum Headphone Output Monto impedance 10 ohms 100mW 32ohms Power Test Tone on off Channel up down Input Levels Mix Level Contour Monitor volume control Input 1 Level Line Mic Mic Phantom Power Input 2 level 10 10dbu RF power level low mid Rear Panel Controls high Internal Adjustments Compression ratio for audio processor Process on off Channel lock Indicates Input 1 Input 2 and Mix audio levels 10 segment LED s 8 green 2 red Indicators Channel Designation lock status RF power level programm
32. it may be ordered to compliment the LT 800 Do Ineed a transmitterforeach audio source A No Each Transmittercan mix two different input sources What isthe range of the LT 800 863 Transmitter A Line of site 122 m 400 ft How many transmitters can be placed in one room A Up to eight can be used simultaneously Can the LR 500 be used with multiple transmitters A Yes We recommend the LR 500 for use with multiple transmitters The LR 500 is programmable and can be set to just those channels you need How many channels can I program into the LR 500 A lto 17 The receiver has 17 channels and you can program it to have just the channels you want to have accessto It can be a two channel receiver a 12 channel receiver or keep all 17 How many receiverscan have in a system A As many as you need the number is endless What isthe difference between the LR 400 and the LR 500 A Both receivers can tune to 17 broadband channels However the LR 400 has the buttons to make changes under the battery compartment door and the LR 400 is not programmable to lock out channels If you plan to use one receiver with multiple transmitters you should use the LR 500 which is programmable to just those channels you need 3 2 D 3 D 3 lt Frequentiy Asked Questions Frequentiy Asked Questions Can the receiverbe locked on a channel if need that A Yes All Listen receiverscan be locked What isth
33. le to the original end purchaserof the product and cannot be transferred Warranty is only valid if waranty card has been retumed oronline waranty registration hasbeen completed 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 otherthan a factory authorized service technician Warranty does not cover normal wear and tearon the productorany other physical damage unlessthe damage wasthe result of a manufacturing defect Warranty does not include inbound freight costs Listen is not liable for consequential damages due to any failure of equipment to perform asintended Listen shall bearno responsibility or obligation with respectto the mannerof 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 govemed by the laws of the state of Uta h 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 repairorreplace transmitters and receivers with a new unit ora unit of similartype and condition Product that isnot covered under warranty shall be repaired orreplaced with a unit of similartype and condition based on a fla
34. nted antenna Rear mounting the LA 129 90 Articulating Antenna 863 MHz will allow the transmitter to be moved if necessary Remote antenna The LA 130 Remote Antenna Kit connects to the LT 800 and can be placed away from the transmitter for better range It also allowsthe unit to be rack mounted with the antenna remotely using the LA 326 Universal Rack Mounting Kit The LA 130 comes with 25 of black coaxial cable RG 58 ATTENTION Long cable runs can result in signal degradation due to the loss characteristics of the cable Minimize cable runs as much as possible or use low loss RG 8 cable 11 7 W G E o M Q S Q O A Key Concepts in Designing a Stationary FM System Front of the rack mounted antenna The antenna can also be in the front of the rack with the use of the LA 131 Antenna Kit for Rack Mount 863 MHz and the LA 326 Universal Rack Mounting Kit MONITOR 0 a INPUT LEVEL TRANSMIT LEVEL CONT 1 gt UN EH AO i 7 WEM VJ e e N N Y 4 SS 44 POWER TEST TONE e CHANNELSELETT 17 800 FM Transmitter Maximizing Transmission Range For properand dependable operation Listen receivers need to receive a strong and consistent signal from the originating transmitter The following strategies should be used maximize this signal Transmitting and receiving antennas When designing and installing your system keep in mind that the location of
35. ny equipment issues with confidence In the few instances where repairs were needed 99 of all clients indicated that they were happy with repair tum around times and 85 of the time clients were without their product for less than 10 days Overall client satisfaction of working with Listen wasrated 4 8 out of 5 The Word Around Listen Please continue with your excellent attitude toward customer satisfaction You guys are great l ve never had such good service from any company Keep up the good work You stand behind your product wondertully Assistive Listening Language Interpretation Soundfield TourGroup Conferencing Stationary FM Table of Contents Design Guide y N E FM Technology Overview a e 1 System Overview Key Conceptsin Designing an FM System Notes LT 800 863 Stationary FM Transmitter Specifications 25 Block Diagram 26 Quick Reference 27 Setup Instructions 28 Operating Instructions 30 Accessories 34 Notes 39 LR 400 500 863 FM Receivers Specifications Block Dia gram Quick Reference Setup Instructions Operating Instructions Programming Instructions LR 500 only Accessories Notes Supplementary Information Battery Charging Information 69 Frequency Chart 70 Troubleshooting 71 Frequently Asked Questions 73 Compliance Warranty and Contact Information 75 Notes 76 Meu w jddns Li fen Stationary FM 863 MHz Design Guide
36. ode Local mode can effectively limit any intermodulation and or interference in a busy RF environment This is done by limiting the amount of RF gain in the receiver When local mode is selected the range of the receiver is compromised Depending on your application and environment Local mode may be necessary for better performance DX mode is default DX Mode default DX is nomal operation The local mode feature can be used when many frequencies are being used Local mode Only strong channels will be automatically tuned in 1 To change to DX Local mode m While the unit is OFF pressand hold the channel down button and tum the unit on 1B The LCD shall indicate the current setting D or L Pressing the down button will toggle between Local and DX Mode D or L 1D Pressing seek will enterthe setting and retum to normal operational mode DX Local Resetting to defaults To reset the receiver to default settings follow these instructions 1 Reset to default settings 1A Press and hold the Up and Down channel buttons while turning the unit on Press and hold the Up and Down channel buttons while tuming the unit on This will light up allsegments of the display 1B After the receiver has been reset After the receiver has been reset the display will retum with defaults present Listen DUN g PGM amp LIO LU IN NOTE The defaults are e Channel 01 Channel loc kout All channels active LR 500 Pro
37. of seeking channels The device shall have an adjusta ble squelch The device shall have an audio frequency response of 50 Hzto 15 KHz 23 dB The device will incorporate a stereo headset jack that allowsthe userto plug in eithera mono or stereo headset The device shall incorporate an LCD display that indicates channel battery level low battery battery charging and RF signal strength The receiver shall be able to function in both DX and Local mode The unit shall operate off of 2 AA batteries The receiver shall incorporate automatic battery charging circuitry for recharging of NIMH batteries The Listen LR 400 863 is specified Specifications LR 400 863 005 stability 32 to 122 0 to 50 C Squelch Programmable in 20 steps automatic on loss of RF signal CE ETSI RoHS System Frequency Response 50 Hz 15 kHz 3 dB System Signal to Noise Ratio 70 dB A Weighted lt 2 total harmonic distortion THD at 80 deviation OUR 3 5 mm connector unbalanced OdBu nominal output level 16 P mW maximum impedance 32 Ohms Channel up down SEEK volume Controls Set up Controls battery compartment Alkaline NiMH battery switch Channel Lock DX Local squelch Kassen low or Charging Flashes when locked and SEEK is pushed Channel Designation lock status signal strength indication battery life Battery Type Type 2 AA batteries alkaline or NIMH Batey Mite ase Batterien d lt s LA 361 10 hours NiMH rechargeable Batte
38. re that the transmitter and receivers are on the same channel Verify that there are no other transmitters on the same channel ora close channel to the one exhibiting interference Try different channels until you find a clear channel Please contact Listen for more ideason troubleshooting the interference End users are adjusting the unit First lock the channel by pressing and holding the channel select UP button for 3 seconds Consider removing the Input Mix Level and Contour knobs You can ordera rack mount kit from Listen which offersa security coverthat will limit accessto the unit Can use another manfactures receivers with the LT 800 863 Listen s 863 MHz equipment is not compatible with any other 863 MHz equipment Several transmitters are operating in the same environment Forthis you ll need to choose yourtransmitting frequencies carefully See pages 15 16 for more details Can I have two antenna s connected to my transmitter No The LT 800 tra nsmitter can use only one antenna connection ata time You may connect eithera top mount antenna through the top antenna port ora remote antenna connected to the BNC connection on the rear of the unit If multiple antennae are simultaneously connected to both portsthe transmitter will have extremely poor broadcast performance and range Frequentiy Asked Questions Frequently Asked Questions Doesthe LT 800 include the rack mount A No but the LA 326 Universal Rack Mount K
39. receiver Make certain you push the plug all the way into the jack es LR 400 500 Setup Instructions 6 Turn the Unit On Receivers are tumed on by rotating the volume dial counterclockwise The red LED on top of the unit will illuminate and the LCD display should illuminate If they do not make sure you have installed the batter les correctly and that you are using fully charged batteries 52 AAA gg LR 400 500 Operating Instructions En Turn Unit On 1A Volume knob Rotate the volume knob counterclockwise with an earphone orheadset connected to the unit WARNING Excessive volume may result in hearing damage 2 Antenna Placement 2A Antenna Position Raise the antenna to the upright position When the antenna iffully extended it will click into position NOTE Be aware that the transmission range could decrease if the antenna is notin an upnght position El Select a Channel EN Select the channel using channel select buttons Select the channel to match the transmission channel by pressing the UP and DOWN buttons on the receiver an un E Listen 862 35 L 53 LR 400 500 Operating Instructions EN Select the channel using SEEK Another way to find a channel on the LR 400 500 isto use the SEEK button When you do this the Listen receiver looks for the next active channel Sometimes the unit will mistake interference fora real broadcast signal If you get interference press the
40. ry Charging NiMH only Fully Automatic 13 hours maximum Physical Door Manually Lockable Up down and power buttons through door Other controls behind door see controls Temperature Operation 10 C 14 F to 40 C 104 F Environmental Temperature Storage 20 C 4 F to 50 C 122 F 0 to 95 Relative Humidity non condensing Specifications are subject to change without notification LR 500 863 Spec ifc ations Architectural Specification The LR 500 863 FM receiver shall be capable of receiving on 17 wide band channels with a SNR of 70 dB or greater The receiver shall be programmable to electronically lock out unneeded channels The receiver shall be capable of seeking channels The device shall be able to be locked on a single channel The device shall have an adjustable squelch The device shall have an audio frequency response of 50 Hz to 15 KHz 33 dB The device will incorporate a stereo headset jack that allows the userto plug in either a mono or stereo headset The device shall incorporate an LCD display that indicates channel battery level low battery battery charging and RF signal strength The receiver shall be able to function in both DX and Local mode The unit shall operate off of 2 AA batteries The receiver shall incorporate automatic battery charging circuitry for recharging of NIMH batteries The Listen LR 500 863 is specified Specification LR 500 863 005 stability 32 to 122 0 to 50 C Sq
41. tfee 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 retuming Listen products If products were damaged in shipment please contact the carrier then contact Listen for replacement or repair requirements payable by the Carrier All Listen European markets are supported through the Listen Technologies GmbH office located in Oberasbach Germany For more information on Listen solutions contact Listen Technologies at 1 801 233 8992 1 800 330 0891 North America Listen Technologies GmbH at 449 911 955159 0 or visit www listentec h c om For Europe Middle East Africa and India office visit www listentec h de 14912 Heritagecrest way Listen Technologies GmbH Bluffd ale Utah U S A 84065 4818 J asminstr 16 90522 Oberasbach Germany 1 801 233 8992 49 911 955 159 O Europe 1 800 330 0891 North America 49 911 955 159 40 Fax 1 801 233 8995 Fax support listentech de support listentech com www listentech de www listeentech com 75 3 2 D 3 D 3 lt Notes A Gu auu aid dme www listentech com Listen TechnologiesCorporation 14912 Heritagecrest 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 info listentec h
42. uelch Programmable in 20 steps automatic on loss of RF signal CE ETSI RoHS System Frequency 50 Hz 15 kHz 3 dB Response System Signal to Noise 70 dB A Weighted Ratio lt 2 total harmonic distortion THD at 80 deviation Output 3 5 mm connector unbalanced OdBu nominal output level 16 mW maximum impedance 32 Ohms Channel up down SEEK volume Set up Controls battery Alkaline NiMH battery switch compartment Channel Lock Out Channel Lock DX Local squelch Controls Red illuminated when unit 1s on Flashes when batteries are aa low or Charging Flashes when locked and SEEK is pushed LCD Display Channel Designation lock status signal strength indication Battery Type Type 2 AA batteries alkaline or NIMH Battery Life Listen bat 20 hours alkaline LA 361 10 hours NiMH rechargeable LA teries 362 Battery Charging NiMH Fully Automatic 13 hours maximum only Physical Door Manually Lockable Up down and power buttons through door Other controls behind door see controls Temperature Operation 10 C 14 F to 40 C 104 F Environmental Temperature Storage 20 C 4 F to 50 C 122 F 0 to 95 Relative Humidity non condensing Specifications are subject to change without notification 46 LR 400 500 Block Diagram LCD Display Down Power Supply O CPU Module L i k 115 230VAC Universal A I see 50 60 Hz Power Supply gt O Se M not included
43. with the highest channels spacing Try to get the channel spacing to be atleast 300 KHz apart e Receiver DX and Local DX Mode Both strong and weak channels will be automatically tuned This will increase the range of the transmission Local mode Only strong channels will be automatically tuned in mal 15 7 W G E o M Key Concepts in Designing a Stationary FM System Example 2 Meeting participants need to select any one of say four language interpretations of the meeting e In general space the channelsasfaras possible from each other For example if four channels are needed from transmitting signals using channels 1 4 8 and 12 would be recommended please see the channel fre quency chart on page 70 forthe list of frequencies e Space the antennasat least one wave length from each other A wave length at 863 864 MHz is 33 cm 13 in e In these applications it would be beneficial to use the LR 500 863 Portable Programmable Display FM Receiver 863 MHz to lock out any unwanted channels The receiver would only see the frequencies currently being used within the room e DXand Local mode can be used forthe receiverto SEEK and find only the strongest signals S Q G uU a Spanish French Chinese English 16 EE E Design Guide Notes 17 Notes opino ubsad 18 Listen Stationary FM 863 MHz amp www listentech corm Sn
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