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User’s Manual
LR-500 Programmable Display Receiver
LR-400 Display Receiver
LR-300 Receiver
Listen Technologies Corporation
Don’t miss a single sound. Listen.
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 USA
Telephone: +1.801.233.8992
Toll Free (North America): 1.800.330.0891
Fax: +1.801.233.8995
E-mail: info@ListenTech.com
®
Listen and the Listen logo are registered trademarks of Listen Technologies Corporation
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Dear Valued Customer, Thank you for choosing Listen! All of us at Listen are dedicated to providing you the highest quality products and prompt, efficient customer care. Our products are manufactured in an ISO-9000 factory that has been independently certified to the highest quality standards. We stand ready to answer any questions you might have during installation or in the operation of our products. Should there be any problems with your Listen products, we are ready to help you in any wa
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Table of Contents Receivers Table of Contents LR-500 User’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 LR-500 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 LR-400 User’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 LR-400 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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User’s Manual LR-500 Programmable Display Receiver Don’t miss a single sound. Listen. Listen Technologies Corporation 8535 South 700 West, Suite A Sandy, Utah 84070-2515 USA Telephone: +1.801.233.8992 Toll Free (North America): 1.800.330.0891 Fax: +1.801.233.8995 E-mail: info@ListenTech.com 3
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LR-500 Package Contents Listen Part Number · LR-500 (72MHz or 216MHz) 72 MHz: LR-500-072 · Warranty Card 216 MHz: LR-500-216 · Receiver User Manual Optional Accessories See pages 70-71. 4 LR-500 Introduction
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LR-500 Table of Contents LR-500 Table of Contents Architectural Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Setup Instructions . . . . . . . . . . . .
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LR-500 Specifications Architectural Specifications The FM receiver shall be capable of receiving on 57 wide and narrow band channels with a SNR of 80dB or greater. The receiver shall be programmable to electronically lock out unneeded channels. The receiver shall be capable of seek- ing channels. The device shall have an adjustable squelch. The device shall have an audio frequency response of 63Hz to 15KHz, ±3dB at 72MHz, or of 63Hz to 10kHz, ± 3dB at 216MHz. The device will incorporate a ste
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LR-500 Specifications LR-500 Specifications continued Specification LR-500-072 16mW maximum, impedance 32 Oh LR ms-500-216 Programmable channel selection (see below), alkaline/NiMH batteries Set Up Controls and squelch, SQ enable/disable User Controls Volume, channel UP/DOWN, SEEK. All controls except volume are electronically lockable. Controls Unit can be programmed so that only desired channels are displayed. Squelch can be Programming adjusted for sensitivity and signal capture control. Ch
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Quick Reference LR-500 Front LED - when lit, indicates 3.5mm Input Jack ON/OFF & VOLUME control dial unit has power. A Listen earpiece or headset connects here. Look & Listen™ display shows receive level, channel, battery status, PROGRAM mode, whether a channel is locked, and whether a channel is locked out from Adjustable Squelch: selection (PROGRAM mode). See close- The default factory preset for squelch up on page 10. is 03.(See page 18 for Squelch programming information) Use UP and DOWN bu
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LR-500 Quick Reference Quick Reference LR-500 Inside Access Door LR-500 Top of Unit Battery Select SQ Switch Switch LED indicators · Steady Red: Normal operation · Slow Flashing: Battery is low · Slow Flashing while charging: Unit is charging Battery Select Switch - place in NiMH position ONLY if you ON/OFF and VOLUME control dial - 3.5mm Input Jack are using Nickel Metal Hydride batteries, otherwise, leave it rotate the dial counter-clockwise to A Listen earpiece or headset in the Alkaline p
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Quick Reference LR-500 Look & Listen™ Display Dots indicate the relative RF Indicates the currently signal strength. tuned channel Battery level indicator. The indi- cator flashes, along with the red LED on top of the unit, to alert you when the battery is low and needs to be charged or Indicates the unit is in PROGRAM mode. changed. To enter PROGRAM mode, press and hold the UP and DOWN keys until the PGM icon appears in the display. To exit PROGRAM L/O: while in Program mode, this symbol mo
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LR-500 Setup Instructions LR-500 Setup Instructions Remove the product Remove outer packaging and plastic cover. Inspect for physical damage. If damage is aparent, please contact Listen Technologies Corporation technical sup- port for assistance. See page 69 for contact information. Open the front access door If locked, use a pocketknife or small screwdriver to unlock the door locks on both sides of the unit. To unlock the door, rotate the lock ¼ turn counterclockwise. Grip the two tabs with
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LR-500 Setup Instructions continued Set SQ switch The SQ switch is inside the battery compartment next to the Battery Select switch. The unit is shipped with SQ in the ON position. To turn it off, use a small screwdriver or pen to slide the switch to the OFF position (to the right). See page 58 for more information on SQ. Battery SQ Select Select Switch Switch Place Batteries in Unit Place two AA batteries in the compartment, making note of the battery polarity shown in the battery compartm
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LR-500 Setup Instructions LR-500 Setup Instructions continued 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 receiver. Make certain you push the plug all the way into the jack. Red LED will illuminate Turn the Unit On when on Earphone/Headset jack Receivers are turned on by rotating the volume Turn volume knob dial counterclockwise. The red LED on top of counterclockwise the un
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LR-500 Operation Instructions Make Sure the Unit is On Rotate the volume knob counterclockwise with an earphone or headset connected to the unit. Listen receivers use the cable of the earphone or headset as a receiving antenna. Be careful when turning the unit on - if you turn the knob too far you might get too much vol- ume in your earphone! Select a Channel Select the channel to match the transmission channel by pressing the UP and DOWN buttons on the receiver. At 72MHz: 72MHz receivers operat
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LR-500 Operation LR-500 Operation Instructions continued Find an audio transmission using SEEK Another way to find a channel on the LR-500 is to use the SEEK button. 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 disto
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LR-500 Programming Instructions The LR-500 Display Receiver has some special features not available in the other receivers: you may lock out unwanted channels, and you can adjust the squelch in the unit. Locking Out Unwanted Channels For applications where users are required to select a channel (such as language interpretation or classrooms), and you don’t want them to have to go through all 57 available channels to find the appropriate channel, you can lock out all channels except the ones you
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LR-500 Squelch LR-500 Squelch Squelch The purpose of squelch is to mute the audio output of your receiver when the signal from the trans- mitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch on your receiver can be adjusted so that it will mute the audio on dif- ferent RF signal strengths. This is useful as follows: · To ensure that users don't hear transmissions from other transmitters, set the squelch setting to the hig
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Squelch Programming Instructions Squelch Programming To enter Squelch programming mode · Turn the unit off · Press and hold the seek button; while still holding seek turn the ON/OFF dial to turn the unit on. · Release the seek button when the Listen name disappears and a two digit display is seen. To adjust the Squelch level · Use the Channel UP and DOWN buttons to raise or lower the squelch sensitivity settings. · Lower numbers mean that a less powerful and possibly noisy signal will be heard,
