Listen Technologies 863.050 User Manual Download Page 5

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Design Guide

LT-800

LR-400/500

Supplementary

Design Guide

FM Technology Overview

System

Overview

Key Concepts in Designing an FM System

Notes 17

LT-800-863 Stationary FM Transmitter

Specifi

cations

Block

Diagram

Quick

Reference

Setup

Instructions

Operating

Instructions

Accessories 34

Notes 35

LR-400/500-863 FM Receivers

Specifi

cations

Block

Diagram

Quick

Reference

Setup

Instructions 50

Operating

Instructions

Programming Instructions (LR-500 only)

Accessories 60

Notes 61

Supplementary Information

Battery

Charging

Information

Frequency

Chart

Troubleshooting

Frequently

Asked

Questions

Compliance, Warranty and Contact Information

Notes 76

Stationary FM Table of Contents

Summary of Contents for 863.050

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Page 3: ...95 Fax support listentech com www listentech com Listen Technologies GmbH Jasminstr 16 905 22 Oberasbach Germany 49 911 955159 0 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 Listen s full time technical support is passionate about what they do and you can depend on them to solve any equi...

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Page 5: ... 28 Operating Instructions 30 Accessories 34 Notes 35 LR 400 500 863 FM Receivers Specifications 45 Block Diagram 47 Quick Reference 48 Setup Instructions 50 Operating Instructions 53 Programming Instructions LR 500 only 59 Accessories 60 Notes 61 Supplementary Information Battery Charging Information 69 Frequency Chart 70 Troubleshooting 71 Frequently Asked Questions 73 Compliance Warranty and Co...

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Page 9: ...3 Design Guide Stationary FM Design Guide Table of Contents Table of Contents 3 Technology Overview 5 System Overview 6 Key Concepts in Designing an FM System 8 Notes 17 ...

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Page 11: ...n the receiver and the transmitter causing the two RF signals to add out of phase This could occur in areas with RF reflective surfaces such as furniture walls or floors The result of multipath is the receiver audio coming in and out of squelch when the receiver is moved Portable applications are much more susceptible to multipath than those that are stationary Multipath distortion is often worse ...

Page 12: ... etc Audio will be Connected into the audio inputs of the stationary transmitter Input Source LT 800 863 Stationary FM Transmitter 863 MHz Input source LR 500 863 Portable Programmable Display FM Receiver 863 MHz LR 400 863 Portable Display FM Receiver 863 MHz The LT 800 transmitter modulates the audio on an FM carrier and transmits the signal via an antenna Transmitter LA 129 90 Articulating Ante...

Page 13: ...d Antenna Listen offers two different portable receivers the LR 400 and LR 500 Receivers LA 131 Antenna Kit for Rack Mount 863 MHz LA 130 Remote Antenna Kit 863 MHz LR 500 863 Portable Programmable Display FM Receiver 863 MHz LR 400 863 Portable Display FM Receiver 863 MHz LA 129 90 Articulating Antenna 863 MHz Included with Transmitter ...

Page 14: ...em Input Selection XLR Wiring Input from Balanced Audio Source Unbalanced Audio Source 1 4 Phone Wiring Balanced Tip Ring Sleeve Unbalanced Top Ring Top Ring Sleeve Audio from Balanced Audio Source Unbalanced Audio Source Sleeve Input 1 Connect the audio source s The LT 800 has two audio input options Input 1 and Input 2 Input 1 is a balanced connection using either an XLR or phono connector and i...

Page 15: ...t Input 2 Connect the audio source s The LT 800 can accommodate two inputs simultaneously with the use of the input level potentiometer When two inputs are present both sets of input level lights will be activated Using Two inputs 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 Input Level Knob Mix...

Page 16: ...m other equipment such as a 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 is to turn a receiver on and press the SEEK button If there are any channels with interference the receiver will find these chann...

Page 17: ...LA 130 Remote Antenna Kit connects to the LT 800 and can be placed away from the transmitter for better range It also allows the 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 run...

Page 18: ... When designing and installing your system keep in mind that the location of both the transmitting and receiving antennas is 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...

Page 19: ...n Orient both transmitting and receiving antennas vertically RF Power switch Position the RF Power switch on the back of the LT 800 to full RF Power unless lower power is necessary Cable Length Keep coaxial cable from transmitter to antenna as short as possible RF Power Switch ...

Page 20: ...h dual units installed 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 NOTE 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 it is not recommended to have the antenna inside Also the depth of the r...

Page 21: ...e number of transmitters operating in this scenario However to reduce the possibility of the receiver accidentally receiving interfering transmissions use the following guide lines Reduce the transmission power on the rear of the LT 800 Stationary Transmitter to the lowest level possible Get the transmitting antenna as close to the receivers as possible Increase the squelch threshold on the receiv...

Page 22: ... antennas at least one wave length from each other A wave length at 863 864 MHz is 33 cm 13 in 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 DX and Local mode can be used for the receiver to SEEK and find only the ...

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Page 29: ...y Card Manual Card Listen Configurations LT 800 863 01 North America LT 800 863 02 Asia UK LT 800 863 03 Euro LT 800 User s Manual Table of Contents Specifications 25 Block Diagram 26 Quick Reference 27 Setup Instructions 28 Operating Instructions 30 Accessories 34 Notes 35 LT 800 863 Stationary FM Transmitter 12 VDC Power Supply LA 129 90 Articulating Antenna 863 MHz ...

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Page 31: ...Mixed Output Rear Panel 2 phono connectors unbalanced 10 dBU nominal output level 19dbu maximum impedance 10 ohms Headphone Output Monitor Front Panel One 3 5 mm stereo connector unbalanced adjustable output level 7dbu maximum impedance 10 ohms 100mW 32ohms Controls Front Panel Power Test Tone on off Channel up down Input Levels Mix Level Contour Monitor volume control Rear Panel Input 1 Level Lin...

Page 32: ...utton Front Panel Input Level Select Mic Phantom Pwr Mic Line ANTENNA 12VDC RF POWER INPUT 1 INPUT 2 MIX OUTPUT TEST TONE CONTOUR PROCESS MIX LEVEL MONITOR 115 230VAC 50 60 Hz 12VDC 1 3A Functions controlled by the CPU Module POWER On Line Volume Down Compression Ratio internal ajustment Female XLR 1 4 Combo Connector 1 Sleeve 3 Ring 2 Tip BNC Low High Mid Off On Off Green LED Input 2 VU Meter MIX...

Page 33: ...lay quick reference Monitor Jack Plug in a headset to monitor audio Mix level Adjusts mixed audio levels Channel Select Up and Down Use to select channel Buttons also used for programming functions Contour Equalization adjustment boosts or cuts high frequencies RF Antenna Output BNC connector for antenna 50 ohm RF Power Level Low med or high RF power Power Input Connect power supply included here ...

Page 34: ...nal rack mount kit part LA 326 according to the instructions included with the kit Mount LT 800 s in Rack if desired 3 Connect antenna to rear of transmitter remotely or rack mount Connect Antenna Rack Mount with dual units installed Rack Mount with single unit installed 4 Plug the power supply into the power connector on the back panel and then plug the power supply into an outlet Only use a List...

Page 35: ...or both audio input connections Input 1 offers a choice of balanced XLR or 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 your balanced or unbalanced audio source into Input 1 Use the following diagram Input 1 6B Plug your unbalanced audio source into Input 2 and select the audio level...

Page 36: ...and DOWN buttons 3 Lock on Channel Once you determine your transmit channel you can lock the transmitter on that channel To lock a channel hold the Channel Select Up button for 3 seconds until the padlock icon appears on the display To unlock repeat this process and the padlock icon will disappear Channel select up and down buttons Power Button ...

Page 37: ... level until the left VU meter s 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 turn the audio gain up so the red LEDs illuminate often 4 1 Adju...

Page 38: ...y music The contour knob adjusts the relative equalization of the unit This equalization boosts or cuts frequencies above 5 kHz Adjust Mix Level Adjust the mix level until the right VU meter occasionally illuminates the red LED This is the level adjustment for the combined output from Input 1 and Input 2 LT 800 Operating Instructions Mix Level Adjustment Knob 2 3 Contour Knob ...

Page 39: ...raising or lowering 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 speaker s emphasis is critical to the message they are conveying LT 800 Operating Instructions 4 Process ...

Page 40: ...ening Notification Signage Kit Accessories for LT 800 863 Accessories LA 131 Antenna Kit for Rack Mount 863 MHz LA 326 Universal Rack Mounting Kit LA 207 12 VDC Power Charging Supply for FM Portable Products LA 207 01 North America LA 207 02 Asia UK LA 207 03 Euro 01 03 02 ...

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Page 49: ...00 863 LR 400 500 User s Manual Table of Contents Specifications 45 Block Diagram 47 Quick Reference 48 Setup Instructions 50 Operating Instructions 53 Programming Instructions LR 500 only 59 Accessories 60 Notes 61 LR 400 863 Portable Display FM Receiver 863 MHz LR 500 863 Portable Programmable Display FM Receiver 863 MHz ...

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Page 51: ...stem Distortion 2 total harmonic distortion THD at 80 deviation Output 3 5 mm connector unbalanced 0dBu nominal output level 16 mW maximum impedance 32 Ohms Controls User Controls Channel up down SEEK volume Set up Controls battery compartment Alkaline NiMH battery switch Programming Channel Lock DX Local squelch Indicators LED Red illuminated when unit is on Flashes when batteries are low or Char...

Page 52: ...em Signal to Noise Ratio 70 dB A Weighted System Distortion 2 total harmonic distortion THD at 80 deviation Output 3 5 mm connector unbalanced 0dBu nominal output level 16 mW maximum impedance 32 Ohms Controls User Controls Channel up down SEEK volume Set up Controls battery compartment Alkaline NiMH battery switch Programming Channel Lock Out Channel Lock DX Local squelch Indicators LED Red illum...

Page 53: ...tor VOLUME On Off Companding Q Technology de emphasis RF de modulation LCD Display Universal Power Supply not included Power Supply CPU Module Up Power charge indicator Red LED Down Seek Tip Ring Sleeve 115 230VAC 50 60 Hz 2 AA Batteries ALkaline or NiMH NiMH Alkaline ...

Page 54: ...EEK Button Allows the user to change channels or lock on a channel Look Listen Display Shows receive level channel battery status and lock status Battery Compartment Place 2 AA batteries in compartment Be sure to follow polarity pattern On Off and Volume Control Dial Battery Select Switch Choose the type of batteries being used Power Charging Port Front Door Lock LED When lit indicates unit has po...

Page 55: ...nt Be sure to follow polarity pattern On Off and Volume Control Dial Battery Select Switch Choose the type of batteries being used Power Charging Port Front Door Lock LED When lit indicates unit has power RF Input Indicator Indicates the RF receive level Channel Display Displays the channel the LR 500 is currently on Lock Icon Indicates the unit is locked on current channel L O Indicates while in ...

Page 56: ... pull the door downward DO NOT place batteries in the unit at this time Two types of batteries may be used The unit is shipped with the switch in the Alkaline position Use a pen or small screwdriver to select the battery type Select Battery Type WARNING Do not place the BATTERY switch in the NiMH position if you are not using Nickel Metal Hydride Batteries The NiMH position will attempt to charge ...

Page 57: ...or all battery types other than NiMH Place Batteries in Unit NOTE Listen provides industrial strength AA alkaline batteries part number LA 361 and high performance AA Nickel Metal Hydride batteries part number LA 362 These may be purchased from your Listen dealer 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 rece...

Page 58: ...ed 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 ies correctly and that you are using fully charged batteries Turn the Unit On 6 ...

Page 59: ...nna Placement NOTE Be aware that the transmission range could decrease if the antenna is not in an upright position Antenna Position Raise the antenna to the upright position When the antenna if fully extended it will click into position Select a Channel Select the channel using channel select buttons Select the channel to match the transmission channel by pressing the UP and DOWN buttons on the r...

Page 60: ...utton When you do this the Listen receiver looks for the next active channel Sometimes the unit will mistake interference for a real broadcast signal If you get interference press the SEEK button again The unit may 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 cha...

Page 61: ...5 seconds to 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 press the SEEK button 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 ...

Page 62: ...gnal will be heard but you can have a longer range before the unit will squelch Once the desired squelch setting is found press SEEK to exit the squelch programming mode 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 for the uni...

Page 63: ...ssroom set the squelch setting high so that when the transmitter is turned off it immediately squelches and ignores transmitters in other rooms 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 is not picked up by the receiver Squelch Setting Squelc...

Page 64: ...the channel down button and turn the unit on The LCD shall indicate the current setting D or L Pressing the down button will toggle between Local and DX Mode D or L Pressing seek will enter the setting and return to normal operational mode LR 400 500 Operating Instructions To reset the receiver to default settings follow these instructions Reset to default settings Resetting to defaults Local DX A...

Page 65: ...the up and down buttons will scroll through channels Pressing the seek button will toggle between available and locked out for that channel When a chan nel is locked out the L O on the LCD shall be displayed To enter program mode To program When no button is pressed for 10 seconds the program menu is exited altogether regardless of whether a function is entered or not To exit out of the program me...

Page 66: ...e Carrying Case LA 321 8 Unit Portable Charging Carrying Case LA 322 8 Unit Portable Carrying Case LA 323 4 Unit Portable Charging Carrying Case w Removable Lid LA 324 8 Unit Portable Charging Carrying Case w Removable Lid LA 325 16 Unit Portable Charging Carrying Case w Removable Lid LA 361 High Capacity AA Alkaline Batteries 2 LA 304 Assistive Listening Notification Signage Kit LA 362 Rechargeab...

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Page 73: ...lementary Supplementary Information Table of Contents Battery Charging Information 69 Frequency Chart 70 Troubleshooting 71 Frequently Asked Questions 73 Compliance Warranty and Contact Information 75 Notes 76 ...

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Page 75: ...red It is best to store your charging case at room temperature away from heat sources and direct sunlight The Listen receivers are unique because they have SmartCharge chargers built in When any of these units are connected to an LA 208 wall transformer or dropped into a Listen charging case NiMH batteries will be charged SmartCharge uses a pulse charging which greatly extends the life of Nickel M...

Page 76: ...70 LT 800 Supplementary Frequency Chart Frequencies ...

Page 77: ...nnections 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 Connect a ground wire from the LT 800 to ground and or to the ground of the source audio There is a tone The Test Tone button has been pressed its LED light is on Push the Test Tone button to turn off the tone The Audio Input 1 sounds tinny If you are using an unb...

Page 78: ... rack mount kit from Listen which offers a security cover that will limit access to the unit Can I 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 For this you ll need to choose your transmitting frequencies carefully See pages 15 16 for more details Can I ...

Page 79: ...s The LR 500 is programmable and can be set to just those channels you need Q How many channels can I program into the LR 500 A 1 to 17 The receiver has 17 channels and you can program it to have just the channels you want to have access to It can be a two channel receiver a 12 channel receiver or keep all 17 Q How many receivers can I have in a system A As many as you need the number is endless Q...

Page 80: ... Questions Frequently Asked Questions Q Can the receiver be locked on a channel if I need that A Yes All Listen receivers can be locked Q What is the battery life of a receiver A 20 hours using alkaline batteries 10 hours using NiMH batteries ...

Page 81: ... 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 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...

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Page 84: ...logies Corporation 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 listentech com Listen Technologies GmbH Jasminstr 16 905 22 Oberasbach Germany 49 911 955159 0 EMEAI 49 911 955159 40 Fax www listentech de info listentech de ...

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