Listen Technologies LA-123 Design Manual Download

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LT-800

LT-803-072

LT-803-072 Block Diagram

Power Supply

CPU Module

Transmitter

RF Board

Pre-emphasis

Processing

Listen LCD

Display Backlit

Universal Power

Supply (provided)

Input 1 VU Meter

Input Level

Front Panel

Input Level

Select Mic-Phantom Pwr, Mic, Line

Test Tone Button

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

Line

Volume

Down

Compression Ratio

(internal adjustment)

Female XLR 1/4’

Combo Connector

1/Sleeve

3/Ring

2/Tip

BNC

Low

High

Mid

Off

Green LED

Input 2 VU Meter

MIX Level

VU Meter

Mic

Phantom Pwr

+10dBu

Phono

-10dBu

OFF

400Hz

Red LED

Summary of Contents for LA-123

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Page 3: ... prompt efficient customer care Because at Listen it s all about you And should you have any comments on how we might improve our products or our service we re here to listen Here s how to reach us 1 801 233 8992 1 800 330 0891 North America 1 801 233 8995 fax support listentech com www listentech com Thank you and enjoy your listening experience Best regards Russell Gentner and the Listen Team In...

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Page 5: ...nary FM Transmitter Specifications 20 Block Diagram 21 Quick Reference 22 Setup Instructions 23 Operating Instructions 25 Accessories 29 Notes 30 LR 200 072 FM Receiver Specifications 36 Block Diagram 37 Quick Reference 38 Setup Instructions 39 Accessories 42 Notes 43 Supplementary Information Battery Charging Information 50 Frequency Chart 51 Troubleshooting 52 Frequently Asked Questions 54 Compl...

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Page 9: ... Receiver 1 LA 123 90 Helical Antenna 4 LA 161 Single Ear Bud 1 LA 304 Assistive Listening Notification Signage Kit 1 LA 207 12 VDC Power Supply 1 Installation Guide LT 803 072 Stationary 3 Channel FM Transmitter 12 VDC Power Supply LA 123 90 Helical Antenna LT 803 72 STANDARD RECEIVER LA 161 Single Ear Bud LR 200 072 Standard 3 Channel FM Receiver This facility is equipped with a hearing assistan...

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Page 11: ...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 infrared FM transmission are not secure This enables a receiver to travel further distances from the source This section of the manual will help you d...

Page 12: ...tes the audio on an FM carrier and transmits the signal via an antenna Transmitter LT 803 072 Stationary 3 Channel FM Transmitter 72 MHz The LP 3CV 072 includes the LA 123 90 Helical Antenna This antenna has a BNC connector and should be mounted on the back of the LT 803 072 For further antenna options see page 11 Antenna The LR 200 072 receiver captures the signal sent from the transmitter and ou...

Page 13: ...o audio input options Input 1 and Input 2 Input 1 is a balanced connection using either an XLR or in phono connector and input 2 is two unbalanced phono connectors Use Input 1 if you are using a microphone or if you have a balanced connection such as a professional audio mixer you can also use Input 1 for unbalanced connections Use Input 2 to connect to an unbalanced audio source Balanced XLR or 1...

Page 14: ...e use of the input level potentiometer When multiple inputs are present both input level lights will be activated Using Multiple 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 LT 803 Input Level Knob LT 803 Mix Level Adjustment ...

Page 15: ...comes from transmitters and other outside FM signals Listen s LT 803 072 offers 3 different channels to choose from With 3 different channels to choose from the chance of finding an interference free channel is increased The best way to check for interference is to turn the LR 200 072 on and listen to each channel Transmit on the channel that has the least amount of noise Testing System Monitor Ja...

Page 16: ...ximize this signal Maximizing Transmission Range Transmitting antenna 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 Minimize the distance and remove any obstructions between the transmitting and receiving antennas Keep transmitting and receiving antennas receiver earphone cord away fr...

Page 17: ...LA 122 Universal Antenna Kit 72 and 216 MHz Alternative Options for Value Package Setup LR 300 072 Portable Digital FM Receiver 72 MHz LR 400 072 Portable Display FM Receiver 72 MHz LR 500 072 Portable Programmable Display FM Receiver 72 MHz LR 100 072 Stationary FM Receiver Power Amplifier 72 MHz Headphone Speaker Seek Channel RFPower Up Down Squelch Mute Power LR 100 OutputLevel LR 600 072 Wirel...

Page 18: ...s to the standard 19 rack The rack mounted unit will take 1 ru of space Rack Mount with dual units installed NOTE The antenna may need to be remote mounted using the LA 122 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 rack and equipment inside could prevent an antenna from being placed inside Rack ...

Page 19: ...13 Design Guide Notes ...

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Page 24: ...nts Specifications 20 Block Diagram 21 Quick Reference 22 Setup Instructions 23 Operating Instructions 25 Accessories 29 Notes 30 LT 803 072 Package Contents 1 LT 803 072 Stationary 3 Channel FM Transmitter 1 LA 207 12 VDC Power Supply 1 Quick Reference Card LT 803 072 Stationary 3 Channel FM Transmitter 12 VDC Power Supply LT 803 Quick Reference Card ...

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Page 26: ...stable from 1 1 to 4 1 Default 2 1 Contour Cuts and boosts frequencies above 5 kHz Combined Audio Output Mix Input 1 and input 2 mixed output rear panel two 2 phono connectors unbalanced 10 dBu nominal output level 15 dBu maximum impedance 10 ohm Headphone Output monitor Front panel one 1 3 5 mm 0 14 in stereo connector unbalanced adjustable output level 3 dBu maximum impedance 10 Ohm Controls Fro...

Page 27: ... 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 adjustment 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 Lev...

Page 28: ...tour Equalization adjustment boosts or cuts high frequencies RF Output Indicator Indicates transmitted RF power level Channel Display Displays the current channel Lock Icon Indicates the unit is locked on current channel Hold Channel up button for 3 seconds to lock On Off channel PGM Indicates the unit is in program mode Monitor Level Adjust the Monitor output volume RF Antenna Output BNC connecto...

Page 29: ...nt kit LA 326 according to the instructions included with the kit Mount LT 803 072 s in Rack if desired 3 Connect antenna to rear of transmitter Connect Antenna LT 803 FM Transmitter LT 803 FM Transmitter LT 803 FM Transmitter 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 Plug the power supply into an o...

Page 30: ... choice of balanced XLR or in phono connector Plug an audio source into Input 1 move the input select switch to the type of input source being used Select Line for Line Inputs Mic for dynamic microphones or Mic PH Power for condenser microphones A balanced feed from a soundboard can also be used with Input 1 Input 1 6B Plug your unbalanced audio source into Input 2 and select the audio level switc...

Page 31: ...WN 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 T 803 T LT 803 Channel select UP DOWN buttons LT 803 Power Button LT T T T T ...

Page 32: ...he 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 Adjusting Audio Le...

Page 33: ...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 803 072 Operating Instructions Mix Level Adjustment Knob 2 3 LT 803 LT 803 LT 803 Contour Knob ...

Page 34: ...3 072 will automatically adjust for inconsistent signal input levels by raising or lowering the signal level accordingly 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 803 072 Operating In...

Page 35: ...pply LA 207 01 12 VDC Replacement Power Supply for LT 803 072 North America LA 207 02 12 VDC Replacement Power Supply for LT 803 072 Asia UK LA 207 03 12 VDC Replacement Power Supply for LT 803 072 Euro Cables Connectors LA 112 RG 58 50 Ohm Coaxial Cable Per ft LA 113 RG 8 50 Ohm Low Loss Coaxial Cable Per ft LA 115 RG 58 BNC Coupler LA 127 RG 58 BNC Connector LA 128 RG 8 BNC Connector LA 390 RG 8...

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Page 40: ...2 MHz 1 Quick Reference Card Listen Configurations LR 200 072 LR 200 072 User s Manual Table of Contents Specifications 36 Block Diagram 37 Quick Reference 38 Setup Instructions 39 Accessories 42 Notes 43 LR 200 072 Standard 3 Channel FM Receiver 72 MHz 72 STANDARD RECEIVER Quick Reference Card ...

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Page 42: ... 0 14 in connectors unbalanced 0 dBu nominal output level 16 mW maximum impedance 32 Ohms Controls User Controls ON OFF volume Set up Controls battery compartment Alkaline NiMH batteries channel switch Programming None Indicators LED Red illuminated when unit is on or to indicate charging flashes when batteries are low LCD Display None Power Battery Type Two 2 AA batteries alkaline or NiMH Battery...

Page 43: ... 5 mm Connector VOLUME On Off 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 44: ...o follow polarity pattern On Off and Volume Control Dial Battery Select Switch Choose the type of batteries being used Alkaline or NiMH Power Charging Port Front Door Lock 3 5 mm Output Jack Connect a Listen earphone s here Channel Select Switch There are 3 separate channels A E H available LED When lit unit is On or charging When batteries are low the LED flashes ...

Page 45: ... 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 any batteries in the unit even if they are not the proper type Charging non Nickel Metal Hydride NiMH batteries will result in physical harm destruction of property and or fire CAUTION If you are using any battery type other ...

Page 46: ...line batteries LA 361 and high performance AA Nickel Metal Hydride batteries 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 receiver Make certain you push the plug all the way into the jack Connect an Earphone or Headset 72 Alkaline Battery Select Channel Selec...

Page 47: ...on top of the unit will illuminate If it does not make sure you have installed the batteries correctly and that you are using fully charged batteries Turn the Unit On 7 Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level 72 STANDARD RECEIVER 8 72 STANDARD RECEIVER ...

Page 48: ...g Case North America LA 321 01 8 Unit Portable FM Product Charging Carrying Case North America LA 323 01 4 Unit Portable FM Product Charging Carrying Case w Removable Lid North America LA 324 01 8 Unit Portable FM Product Charging Carrying Case w Removable Lid North America LA 325 01 16 Unit Portable FM Product Charging Carrying Case w Removable Lid North America Carrying Cases LA 306 Soft Case 72...

Page 49: ...43 LR 200 072 Notes ...

Page 50: ...44 LT 800 LR 200 072 Notes ...

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Page 54: ...upplementary Supplementary Information Table of Contents Battery Charging Information 50 Frequency Chart 51 Troubleshooting 52 Frequently Asked Questions 54 Compliance Warranty and Contact Information 55 Notes 57 ...

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Page 56: ...st be set to the NiMH setting Use a pen or small screwdriver to 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 at room temperature away from heat sources and direct sunlight The LR 200 072 receive...

Page 57: ...51 Supplementary Frequency Chart Channel Frequency MHz A 72 100 E 72 900 H 75 900 ...

Page 58: ...ections from the audio source to the LT 803 072 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 803 072 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 ...

Page 59: ...our knobs You can order a rack mount kit LA 326 from Listen which offers a security cover that will limit access to the unit I am using another manfactures receiver with the LT 803 072 Listen s 72 MHz equipment is compatible with any other 72 MHz equipment Several transmitters are operating in the same environment Be sure each transmitter is using a seperate frequency A E H Can I have two antenna ...

Page 60: ...n recievers A Limited lifetime warranty The following cases will void the warranty Misuse dropping or any other noticeable cosmetic damage Charging alkaline batteries instead of NiMH Overheating the charging process by closing the lid on the charging case Q What is the range of the LT 803 072 transmitter A Line of site up to 1000 ft 304 8 m Q Does the LT 803 072 include the rack mount Q Do I need ...

Page 61: ...cables is likely to result in interference to radio and TV reception The user is cautioned that changes and modifications made to the equipment without the approval of manufacturer could void the user s authority to operate this equipment This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 These devices may not cause harmful interference and 2 ...

Page 62: ...rging Carrying Cases LA 311 LA 313 LA 317 LA 318 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 available to the original end purchaser of the product and cannot be transferred Warr...

Page 63: ...57 Supplementary Notes ...

Page 64: ...58 LT 800 Supplementary Notes ...

Page 65: ...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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