Listen Technologies LR-300, LR-400, LR-500 LR-300 Specifications

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LR-300 Specifications

LR-300 Specifications

Architectural Specifications

The FM receiver shall be capable of receiving on 17 wide band channels and have a SNR of 80dB or greater. The

receiver shall be capable of seeking channels. The device shall have a squelch. The device shall have an audio frequen-

cy response of 63Hz to 15KHz, ± 3dB at 72MHz. The device shall incorporate a stereo headset jack that allows the user

to plug in either a mono or stereo headset and listen to audio normally. The receiver shall incorporate automatic battery

charging circuitry for recharging of NiMH batteries. The Listen LR-300 is specified.

Specifications

Specification LR-300-072

RF Frequency Range 72.025 - 75.950 MHz

Number of Channels 17 (wide band)

Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD

Frequency Accuracy ± .005% stability 0° to 50°C (32° to 122° F)

Antenna Uses earphone cable

Antenna Connector 3.5mm connector

Squelch Automatic on loss of RF signal

Compliance FCC Part 15, Industry Canada

System Frequency Response 63Hz - 15kHz (±3dB)

System Signal to Noise Ratio

(A-weighted)

SQ enabled: 80dB; SQ disabled 60dB

System Distortion <2% total harmonic distortion (THD) at 80% deviation

Output

3.5mm connectors, unbalanced, 0dBu nominal output level,

16mW maximum, impedence 32 Ohms

Set Up Controls Alkaline/NiMH batteries, SQ enable/disable

User Controls Volume, SEEK (Channel SEEK is electronically lockable)

Programming

Channel selection can be locked by holding the

SEEK button for 5 seconds.

RF

** All system specifications are wireless end-to-end

Audio

Controls

Contents

Main Welcome to Listen! Receivers Table of Contents Page Page Page LR-500 Table of Contents LR-500 Specifications LR-500 Specifications Specifications Indicators Power Specification LR-500-072 LR-500-216 LR-500 Specifications LR-500 Specifications continued LR-500 Quick Reference LR-500 Front LR-500 Quick Reference LR-500 Inside Access Door LR-500 Top of Unit LR-500 Quick Reference LR-500 Look & Listen Display LR-500 Battery Indicator LR-500 Setup Instructions LR-500 Setup Instructions LR-500 Setup Instructions LR-500 Setup Instructions continued Place Batteries in Unit LR-500 Setup Instructions LR-500 Setup Instructions continued LR-500 Operation LR-500 Operation Instructions LR-500 Operation LR-500 Operation Instructions continued Find an audio transmission using SEEK Adjust the volume control To Lock into Only One Channel Is the Channel Locked on My Receiver? LR-500 LR-500 Squelch LR-500 Squelch Squelch Programming Instructions LR-500 Squelch Squelch Programming LR-500 Charging Batteries LR-500 Charging Batteries LR-500 Charging Batteries LR-500 Charging Batteries continued LR-500 Wall Transformer LR-500 Wall Transformer Operation Page Page Page LR-400 Table of Contents LR-400 Table of Contents LR-400 Specifications LR-400 Specifications Specifications LR-400 Specifications Indicators Specification LR-400-072 LR-400-216 Power Environmental LR-400 Front LR-400 Top of Unit LR-400 Quick Reference LR-400 Inside Access Door LR-400 Quick Reference LR-400 Look & Listen Display LR-400 Battery Indicator LR-400 Setup Instructions LR-400 Setup Instructions LR-400 Setup Instructions LR-400 Setup Instructions continued Place Batteries in Unit Connect an Earphone or Headset LR-400 Setup Instructions LR-400 Setup Instructions continued Turn the Unit On Select Channel(s) Set Squelch LR-400 Operation LR-400 Operation Instructions LR-400 Operation LR-400 Operation Instructions continued Find an audio transmission using SEEK Adjust the volume control To Lock into Only One Channel Is the Channel Locked on My Receiver? LR-400 Squelch LR-400 Squelch Squelch LR-400 Squelch Squelch Programming Instructions Squelch Programming LR-400 Charging Batteries LR-400 Charging Batteries LR-400 Charging Batteries LR-400 Charging Batteries continued LR-400 Wall Transformer LR-400 Wall Transformer Operation Page Page LR-300 Table of Contents LR-300 Table of Contents LR-300 Specifications 44 LR-300 Specifications Specifications Specification LR-300-072 RF Audio LR-300 Specifications LR-300 Specifications continued Page LR-300 Quick Reference LR-300 Inside Access Door LR-300 Top of Unit LR-300 Setup LR-300 Setup Instructions LR-300 Setup LR-300 Setup Instructions continued LR-300 Operation LR-300 Operation Instructions LR-300 Operation & Squelch LR-300 Operation Instructions continued LR-300 Charging Batteries LR-300 Charging Batteries LR-300 Charging Batteries LR-300 Charging Batteries continued LR-300 Wall Transformer LR-300 Wall Transformer Operation Supplementary Info Supplementary Information Channel Selection Channel Selection Channel Selection Channel Selection continued Listen SQ Listen SQ SQ Summary RF Reception Strategies RF Reception Maximization Strategies 72MHz Compatibility Chart 60 72MHz Compatibility Chart Chart continued on next page Updated 03.16.04 *Parenthesis indicate T35 and T20 narrowband. NOTE: Wideband frequencies in highlighted rows. 61 72MHz Compatibility Chart continued *Parenthesis indicate T35 and T20 narrowband. NOTE: Wideband frequencies in highlighted rows. 62 216MHz Compatibility Chart Chart continued on next page 216MHz Compatibility Chart Updated 03.16.04 *Parenthesis indicate T35 and T20 narrowband. NOTE: Wideband frequen- cies in highlighted rows. 63 216MHz Compatibility Chart 216MHz Compatibility Chart continued *Parenthesis indicate T35 and T20 narrowband. NOTE: Wideband frequen- cies in highlighted rows. Receiver Troubleshooting - LR-300, LR-400, LR-500 The receiver has no power. Receiver Troubleshooting There is no audio. The audio is distorted. Receiver Troubleshooting Receiver Troubleshooting continued Receiver Troubleshooting Page FCC Statement FCC Statement Warranty Warranty Optional Accessories Earphone Options Optional Accessories