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Dear Valued Customer, Thank you for choosing Listen! All of us at Listen are dedicated to providing you with the highest quality products available. We take great pride in their outstanding performance because we care that you are completely satisfi ed. That’s why we independently certify them to the highest quality standards and back them with a limited lifetime guarantee. We stand ready to answer any questions you might have during installation or in the operation of our products. Should
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LT-800 Table of Contents Package Contents 3 150 MHz Specifi cations 4 Block Diagram 5 Quick Reference 6 Setup Instructions 7 Operating Instructions 10 Audio Control 11 Listen SQ™ (Super Quiet) 12 RF Reception Maximization Strategies 13 Coaxial Cable 13 Channel Selection 14 150 MHz Frequency Chart 15 Troubleshooting 16 Warranty 18 Conta
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LT-800 Package Contents LT-800 Contents Listen Part Number • LT-800-150 (150 MHz) LT-800-150 (150 MHz) • 12 VDC Power Supply • User Manual • Quick Reference Card Optional Accessories See pages 19-20 3
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LT-800 Specifi cations Architectural Specifi cations The stationary FM transmitter shall be capable of broadcasting on 32 channels. The transmitter shall have an SNR of 80 dB or greater. The output power shall be adjustable to quarter, half or full. Channel tuning shall be capable of being locked. The device shall have an audio frequency response of 50 Hz to 15 kHz (±3 dB). It shall have two (2) mixing audio inputs and a mixed signal output. The device shall have the following audio controls:
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LT-800 Block Diagram POWER On Off Red 3.5MM LED Stereo In-Line CHANNEL SELECT Power Supply 115VAC6 LA-201 Up 0 Hz HEADPHONE (provided) 15VAC, 1A Power Supply Down CPU Module Volume Listen LCD Display Backlighted MIX Level Top Mounted Compression Ratio VU Meter Antenna Stud (internal adjustment) Remote Antenna Connection Transmitter RF Board Pre-emphasis Processing SQ Companding BNC ANTENNA Green Green LED LED MIX LEVEL On Off Low On Off High Functions controlled by the CP Mid Module RF PO
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LT-800 Quick Reference Top mount antenna connection: LT-800 Front Panel: Controls & Displays Remove rubber plug and screw Indicates antenna in place. Process Mode is active. Indicates LCD: Shows Indicates audio input Monitor Port: Plug Super Quiet which channel level of Input 1 and Shows Adjust audio input levels in a headset and mode is active. is selected. Input 2. mixed audio of Input 1 and Input 2 adjust volume. level. here. See page 11 for more information. Mix Level: Adjust so
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LT-800 Setup Instructions 1 Unpack the Product Remove outer packaging and plastic cover. Inspect for physical damage. 2 Mount in Rack (if necessary) If rack mounting the unit, install the optional rack mount kit (part LA-326) according to the instructions included with the kit, then install the LT-800 in the rack. NOTE: If rack mounting, you will need to use a rear connection antenna. Rack Mount with single unit installed Rack Mount with dual unit installed Shown with LT-800 3 Connect Antenna C
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LT-800 Setup Instructions (cont.) Set SQ™ (Super Quiet) and Process Features 5 Your transmitter is shipped to you with SQ (super quiet) enabled and Process disabled. For a detailed description of these features and when to use them, please refer to page 12. To Disable or Enable SQ and Process Features: With the unit on press and hold the channel select “Down” button for 8 seconds. The program (PGM) icon will appear on the LCD. Once in the program mode, Program icon the SQ and Process feature
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LT-800 Setup Instructions (cont.) 7 Connect Audio Inputs The LT-800 has two audio input options: Input 1 and Input 2. Input 1 is a balanced connection using either an XLR or 1/4” phono connector. Input 2 has two unbalanced mixing phono connectors. Use Input 1 if you are using a microphone or if you have a balanced connection such as from a professional audio mixer (you can also use Input 1 for unbalanced connections). Use Input 2 to connect to an unbalanced audio source. Input 1 Input 1 offe
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LT-800 Operating Instructions Power Unit On 1 Turn power on by pressing the power button. 2 Select a Channel Select the transmit channel by pressing the channel select UP and DOWN buttons. See Channel Selection on page 14 for more information. Channel Select UP and DOWN buttons 3 Lock on Channel Once you determine your transmit channel, you can lock the transmitter on that channel. To lock on a channel hold the Channel Select “Up” button for 3 seconds until the padlock icon appears on the dis
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LT-800 Audio Control Adjust Audio Input Level 1 Adjust the input knob counterclockwise to add gain to Input 1. This will decrease gain to Input 2. Adjust input knob clockwise to add gain to Input 2. This will decrease gain to Input 1. If you have two audio sources connected to both Input 1 and 2, adjust the level of one input using the VU meter, then adjust the output level of the other audio source. Adjust the input level until the left VU meter(s) occasionally illuminate the red LEDs. Ill
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Listen SQ™ (Super Quiet) - Improving Your Listening Experience People are accustomed to listening to low noise, high fidelity audio SQ Summary (delivered via CD, DVD, etc.). FM radio systems, such as those made • SQ is NOT squelch by Listen, have more inherent noise compared to most sound systems. • SQ improves noise performance To minimize noise, Listen uses a noise reduction technology called by at least 20 dB ListenSQ™. Both the transmitter and receiver must have the SQ feature enabled
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RF Reception Maximization Strategies For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the originating transmitter. Note that on portable receivers the headset wire is the receiving antenna. The following strategies should be used maximize to this signal: 1 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. 2 Eliminate or min
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Channel Selection It is important to choose channels that are free from interference to achieve proper operation of your Listen equipment. This process is trial Wide Band Recommendation and error. Before turning on the transmitter, listen to the wide band Listen recommends that you always channels on the receivers (channels 1-6). Listen to the audio through use a wide band channel unless you the headphone or via the speaker and choose a channel with the need to be compatible with existing le
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150 MHz Frequency Chart Channel Frequency 01 150.900 02 152.400 03 151.500 04 152.100 05 151.200 06 151.800 07 150.850 08 150.950 09 151.000 10 151.050 11 151.100 12 151.150 13 151.250 14 151.300 15 151.350 16 151.400 17 151.450 18 151.550 19 151.600 20 151.650 21 151.700 22 151.750 23 151.850 24 151.900 25 151.950 26 152.000 27 152.050 28 152.150 29 152.200 30 152.250 31 152.300 32 152.350 15
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LT-800 Troubleshooting Troubleshooting The LT-800 has no power Make sure the LA-207 power supply is connected to a power source and is connected to the jack marked “Power Input”. Make sure the POWER button is pressed in. There is no audio or the audio level is too low Make sure that your audio source is properly connected to Input 1 and/or Input 2. The Input 1 or Input 2 switches must be in the correct position for the appropriate input level. For example: if you are using the output of a
