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 satisfied. 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.
LT-800 Table of Contents Package Contents 150 MHz Specifications Block Diagram Quick Reference Setup Instructions Operating Instructions 3 4 5 6 7 10 Audio Control Listen SQ™ (Super Quiet) RF Reception Maximization Strategies Coaxial Cable Channel Selection 150 MHz Frequency Chart 11 12 13 13 14 15 Troubleshooting Warranty Contacting Listen Optional Accessories 16 18 18 19 1
LT-800 Package Contents LT-800 Contents • • • • LT-800-150 (150 MHz) 12 VDC Power Supply User Manual Quick Reference Card Listen Part Number LT-800-150 (150 MHz) Optional Accessories See pages 19-20 3
LT-800 Specifications Architectural Specifications 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.
LT-800 Block Diagram POWER On Off Red LED 115VAC6 0 Hz 3.
LT-800 Quick Reference LT-800 Front Panel: Controls & Displays Adjust audio input levels of Input 1 and Input 2 here. See page 11 for more information. Power ON / OFF Test Tone: Activates a tone to aid system setup. Indicates Process Mode is active. Indicates Indicates audio input Super Quiet level of Input 1 and Shows mode is active. Input 2. mixed audio level. Mix Level: Adjust so the Mix Level meter occasionally lights the red LED. Contour: Equalization adjustment.
LT-800 Setup Instructions 1 Unpack the Product 2 Mount in Rack (if necessary) Remove outer packaging and plastic cover. Inspect for physical damage. 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.
LT-800 Setup Instructions (cont.) 5 Set SQ™ (Super Quiet) and Process Features 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.
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.
LT-800 Operating Instructions 1 Power Unit On 2 Select a Channel Turn power on by pressing the power button. 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 display.
LT-800 Audio Control 1 Adjust Audio Input Level 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.
Listen SQ™ (Super Quiet) - Improving Your Listening Experience People are accustomed to listening to low noise, high fidelity audio (delivered via CD, DVD, etc.). FM radio systems, such as those made by Listen, have more inherent noise compared to most sound systems. To minimize noise, Listen uses a noise reduction technology called ListenSQ™. Both the transmitter and receiver must have the SQ feature enabled to achieve the desired results.
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.
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 and error. Before turning on the transmitter, listen to the wide band channels on the receivers (channels 1-6). Listen to the audio through the headphone or via the speaker and choose a channel with the least amount of interference. Unless you are interfacing with an existing narrowband transmission system, always use a wide band channel.
150 MHz Frequency Chart Channel 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Frequency 150.900 152.400 151.500 152.100 151.200 151.800 150.850 150.950 151.000 151.050 151.100 151.150 151.250 151.300 151.350 151.400 151.450 151.550 151.600 151.650 151.700 151.750 151.850 151.900 151.950 152.000 152.050 152.150 152.200 152.250 152.300 152.
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.
LT-800 Troubleshooting (cont.) Troubleshooting There is not sufficient range First make sure that the receivers you are using are operating properly, then make sure that you have an antenna connected either to the top of the LT-800 transmitter or connected to the back of the unit (but not both!). The antenna should be as high as possible and free of obstacles. In addition make sure you are using the correct antenna type for your unit.
Warranty & Contacting Listen Warranty Listen Technologies Corporation (Listen) warrants its transmitters and receivers (LT-82, LT-700, LT-800, LR-42, LR-44, LR-400, LR-500) to be free from defects in workmanship and material under normal use and conditions for the useful lifetime of the product from date of purchase. Listen warrants its Stationary IR Radiators (LA-140) to be free from defects in workmanship and material under normal use and conditions for three years from the date of purchase.
Optional Accessories Antenna Accessories LA-134 Telescoping Top Mounted Antenna (150 MHz) LA-133 90˚ Helical Antenna (150 MHz) LA-132 Universal Antenna Kit LT-800 Rack Mount Accessories LA-135 Antenna Kit for Rack Mount LA-326 Universal Rack Mounting Kit Includes components for single and dual rack configuration and a security cover NOTE: Rack mounted units cannot use the LA-134 top mounted antenna.
Optional Accessories (cont.) Cable & Connectors Accessories LA-112 RG-58 50 Ohm Coaxial Cable (per ft.) LA-127 RG-58 BNC Connector LA-113 RG-8 50 Ohm Low-Loss Coaxial Cable (per ft.
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Listen Technologies Corporation 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.
