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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 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. Should
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Design Guide LT-803-072 Supplementary LR-200-072 Value Package Table of Contents Design Guide FM Technology Overview 5 System Overview 6 Key Concepts in Value Package Setup 7 Alternative Options for Value Package Setup 11 Notes 13 LT-803-072 Stationary FM Transmitter Specifications 20 Block Diagram 21 Quick Reference 22 Setup Instructions 23 Operating Instructions 25 Accessories
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Design Guide Value Package Design Guide Table of Contents FM Technology Overview 5 System Overview 6 Key Concepts in Value Package Setup 7 Alternative Options for Value Package Setup 11 Notes 13 Value Package Contents • (1) LT-803-072 Stationary 3-Channel FM Transmitter • (4) LR-200-072 Standard 3-Channel FM Receiver • (1) LA-123 90° Helical Antenna • (4) LA-161 Single Ear Bud LA-161 Single Ear Bud • (1
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Design Guide Frequency Modulation (FM) Technology Overview Frequency modulation or (FM) is a means of transmitting audio using electromagnetic waves. This same technology is used by local FM radio stations to broadcast music. FM signals can travel through most barriers – walls, floors, and ceilings. The distance a signal travels has many different variables such as Radio Frequency (RF) output power, the type and placement of the antenna, and the broadcasted frequency. Unlike infrared, FM tra
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System Overview There are four main components to the Value Package – the transmitter, antenna, receiver and input source. Input Source The input source can be audio from a sound board, microphone or a personal audio source like a CD player, MP3 player, computer, DVD, etc. Audio will be connected into the audio inputs of the Stationary Transmitter. Transmitter The LT-803-072 transmitter modulates the audio on an FM carrier and transmits the signal via an antenna. LT-803-072 Stationary 3-Channe
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Design Guide Key Concepts in Value Package Setup Input Selection The LT-803-072 has two audio input options: Input 1 and Input 2. Input 1 is a balanced connection using either an XLR or ¼ in. phono connector, and input 2 is two unbalanced phono connectors. Use Input 1 if you are using a microphone or if you have a balanced connection such as a professional audio mixer (you can also use Input 1 for unbalanced connections). Use Input 2 to connect to an unbalanced audio source. Balanced XLR or
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Key Concepts in Value Package Setup Using Multiple inputs The LT-803-072 can accommodate multiple inputs simultaneously with the use of the input level potentiometer. When multiple inputs are present, both input level lights will be activated. Input Level Knob Mix Level The mix level acts as the “master transmit” control. It will increase the transmit gain on the “mix” of the two levels (if two levels are in use). Mix Level Adjustment 8 LT-803 LT-803 Design Guide
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Design Guide Key Concepts in Value Package Setup Selecting Transmitting Frequencies Use this section of the guide to choose the channel settings for the transmitter and receivers. Find transmission channel(s) The goal is to find a transmission channel(s) that is free from interference. Interference comes from transmitters and other outside FM signals. Listen’s LT-803-072 offers 3 different channels to choose from With 3 different channels to choose from, the chance of finding an interference
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Key Concepts in Value Package Setup Antenna placement (rear) Rear mounted antenna Rear mounting the LA-123 90° Helical Antenna (72 MHz) will allow the transmitter to be moved if necessary. Maximizing Transmission Range For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the originating transmitter. The following strategies should be used to maximize this signal: Transmitting antenna When designing and installing your system, keep in mind tha
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Design Guide Alternative Options for Value Package Setup Remote antenna The LA-122 Universal Antenna Kit (72 and 216 MHz) and the LA-116 Coaxial Dipole Remote Antenna (72 MHz) connect to the LT-803-072 and can be placed away from the transmitter for better range. They also allow the unit to be rack mounted with the antenna remotely using the LA-326 Universal Rack Mounting Kit. Both the LA-122 and LA-116 come with 25’ of black coaxial cable (RG-58). ATTENTION: Long cable runs can result in sig
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Key Concepts in Value Package Setup Rack Mounting the Transmitter LT-803 FM Transmitter The LT-803-072 can be rack mounted if necessary. With the use of the Listen LA-326 Universal Rack Mount Kit, you can mount one or two transmitters to the standard 19” rack. The rack mounted unit will take 1 ru of space. LT-803 FM Transmitter LT-803 FM Transmitter Rack Mount with dual units installed. LT-803 FM Transmitter Rack Mount with single unit installed. The antenna can also be in the front of the rack
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Design Guide Notes 13
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Notes 14 Design Guide
