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Design Guide

System Overview

Listen offers two different portable receivers.

Receivers

LR-500

Portable Programmable

Display FM Receiver (863 MHz)

LR-400

Portable Display FM

Receiver (863 MHz)

The LT-700 modulates the audio on an FM carrier and transmits the signal via an antenna

on the unit.

Transmitter

LT-700

Portable Display FM

Transmitter (863 MHz)

Содержание Portable fm 863 Mhz

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Страница 3: ...how to reach us 801 233 8992 800 330 0891 North America 801 233 8995 Fax support listentech com www listentech com Thank you and enjoy your listening experience Best regards Russell Gentner and the L...

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Страница 5: ...nstructions 23 Programming Instructions 25 Accessories 28 Notes 29 LR 400 500 FM Receivers Specifications 37 Block Diagram 39 Quick Reference 40 Setup Instructions 42 Operating Instructions 45 Program...

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Страница 9: ...Design Guide Portable FM Design Guide Table of Contents FM Technology Overview 5 System Overview 6 Key Concepts in Designing an FM System 8 Notes 10...

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Страница 11: ...ind Multipath Multipath distortion is a form of RF interference that occurs when radio signals have more than one path between the receiver and the transmitter This could occur in rooms with metallic...

Страница 12: ...io inputs at once on one transmission channel With the use of the LA 263 line cable both the inputs will be mixed Thus a person can use a line input source and mic source Input Source LA 278 Behind th...

Страница 13: ...ers Receivers LR 500 Portable Programmable Display FM Receiver 863 MHz LR 400 Portable Display FM Receiver 863 MHz The LT 700 modulates the audio on an FM carrier and transmits the signal via an anten...

Страница 14: ...nd a transmission channel s that is free from interference Interference originates from other transmitters and from other equipment such as a computer Listen products offer 17 different channels to ch...

Страница 15: ...Systems In many applications there will be more than one RF transmission in the same general vicinity Intermodulation interference can occur if the transmission frequencies are too close together Her...

Страница 16: ...10 Design Guide Notes...

Страница 17: ...11 Design Guide Notes...

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Страница 21: ...n Configurations LT 700 863 LT 700 User s Manual Table of Contents Specifications 17 Block Diagram 18 Quick Reference 19 Setup Instructions 20 Operating Instructions 23 Programming Instructions 25 Acc...

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Страница 23: ...ms Microphone Sensitivity Three position switch high middle and low 6db increments Line Input Unbalanced ring of 3 5mm connector 10dbu nominal input level 3dbu maximum impedance 10K ohms Microphone po...

Страница 24: ...or Companding Q Technology Pre emphasis RF Modulation LCD Display Universal Power Supply not included Power Supply CPU Module Up Power charge indicator Red LED Down Power Tip Ring Sleeve 115 230VAC 50...

Страница 25: ...us Battery Compartment Place 2 AA batteries in compartment Be sure to follow polarity pattern Mute On Off switch RF output indicator Indicates RF power level Channel Display Displays the channel the L...

Страница 26: ...in the unit at this time Open the front access door 3 Two types of batteries may be used NiMH and Alkaline The unit is shipped with the switch in the Alkaline position Use a pen or small screwdriver t...

Страница 27: ...rom another vendor you may need to experiment with different settings Set Mic Sensitivity Switch Part Description Setting LA 261 Lavalier Microphone MED LA 278 Behind the Head Microphone MED 5 Place t...

Страница 28: ...this you must order the Listen LA 263 Line Input Cable not included with your unit This cable allows you to connect both a microphone and line input to the jack on top of the LT 700 See the diagram b...

Страница 29: ...are that the transmission range could decrease if the antenna is not in an upright position Raise the antenna to the upright position When the antenna if fully upright it will click into position 3 Se...

Страница 30: ...o is muted When the microphone audio is muted the LED on top of the unit flashes rapidly Slide the switch back to the talk position and the microphone audio will return to the transmission If you are...

Страница 31: ...application and you don t want them to have to scroll through all of the available channels this feature is ideal The LT 700 can also be changed from high to low power levels Adjusting the power setti...

Страница 32: ...er P3 is the default Pressing the channel up button will toggle through the following settings a Low power LCD displays P1 b Med power LCD displays P2 c High power LCD displays P3 4 When no button is...

Страница 33: ...display will return with defaults present 1B After the receiver has been reset 1A Press and hold the Up and Down channel buttons while turning the unit on Press and hold the Up and Down channel button...

Страница 34: ...able 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 Carr...

Страница 35: ...29 LT 700 Notes...

Страница 36: ...30 LT 700 Notes...

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Страница 41: ...400 500 User s Manual Table of Contents Specifications 37 Block Diagram 39 Quick Reference 40 Setup Instructions 42 Operating Instructions 45 Programming Instructions LR 500 only 51 Accessories 52 Not...

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Страница 43: ...80 modulation 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 NiMH a...

Страница 44: ...A Weighted System Distortion 2 THD 80 modulation 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...

Страница 45: ...tor VOLUME On Off Companding Q Technology Pre emphasis RF Modulation LCD Display Universal Power Supply not included Power Supply CPU Module Up Power charge indicator Red LED Down Seek Tip Ring Sleeve...

Страница 46: ...nnel programming 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 RF input indicator Indicates t...

Страница 47: ...Compartment Place 2 AA batteries in compartment Be sure to follow polarity pattern On Off and Volume Control Dial RF input indicator Indicates the RF receive level Channel Display Displays the channel...

Страница 48: ...pull the door downward DO NOT place batteries in the unit at this time 3 Two types of batteries may be used The unit is shipped with the switch in the Alkaline position Use a pen or small screwdriver...

Страница 49: ...for 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 p...

Страница 50: ...on by rotating the volume dial counterclockwise The red LED on top of the unit should activate and the LCD display should illuminate If they do not make sure you have installed the batteries correctl...

Страница 51: ...2 Antenna Placement NOTE Be aware that the transmission range could decrease if the antenna is not in an upright position 2A Antenna Position Raise the antenna to the upright position When the antenna...

Страница 52: ...on 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 T...

Страница 53: ...for 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...

Страница 54: ...signal will be heard but you can have a longer range before the unit will squelch 2 Once the desired squelch setting is found press SEEK to exit the squelch programming mode 3 Squelch setting 00 is n...

Страница 55: ...room setting 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 s...

Страница 56: ...own button and turn the unit on 1A The LCD shall indicate the current setting D or L 1B Pressing the down button will toggle between Local and DX Mode D or L 1C 1D Pressing seek will enter the setting...

Страница 57: ...wn buttons will scroll through the functions f1 Pressing the seek button will enter that particular function F1 Channel Lock out No channels are locked out as default Pressing the up and down buttons...

Страница 58: ...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 Carry...

Страница 59: ...53 LR 400 500 Notes...

Страница 60: ...54 LR 400 500 Notes...

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Страница 63: ...57 LR 400 500...

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Страница 65: ...ementary Supplementary Information Table of Contents Frequency Chart 61 Battery Charging Information 62 Troubleshooting 63 Frequently Asked Questions 65 Compliance Warranty and Contact Information 67...

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Страница 67: ...61 Supplementary Frequency Chart Frequencies...

Страница 68: ...best to store your charging case at room temperature away from heat sources and direct sunlight The LT 700 and both Listen receivers are unique because they have SmartCharge chargers built in When an...

Страница 69: ...ting the switch is located inside the battery compartment Some microphones have directional pickups ensure that the microphone in use is oriented and positioned properly pointing at the speakers mouth...

Страница 70: ...sure the batteries are installed correctly Make sure you are using the right kind of wall transformer Listen part number LA 208 or charging case Make sure the charging case is connected to power and t...

Страница 71: ...multiple transmitters because the LR 500 is programmable and can lock out unused channels Q How many channels can I program into the LR 500 A 1 to 17 The receiver has 17 channels and you can program i...

Страница 72: ...requently Asked Questions Q Can the receiver be locked on a channel if needed A Yes All Listen receivers can be locked on a single channel Q What is the battery life of a receiver A 20 hours using alk...

Страница 73: ...t liable for consequential damages due to any failure of equipment to perform as intended Listen shall bear no responsibility or obligation with respect to the manner of use of any equipment sold by i...

Страница 74: ...68 Supplementary Notes...

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Страница 76: ...Heritagecrest Way Salt Lake City Utah 84065 4818 U S A 801 233 8992 800 330 0891 North America 801 233 8995 fax www listentech com Printed in the United States of America 2007 Listen Technologies Cor...

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