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-700 Table of Contents Package Contents 150 MHz Specifications Quick Reference Setup Instructions Operating Instructions Programming Instructions 3 4 5 7 9 10 Charging Batteries Wall Transformer Operation Channel Selection Listen SQ™ RF Reception Maximization Strategies 150 MHz Frequency Chart 11 12 13 14 15 16 Troubleshooting Warranty Contact Information Optional Accessories 17 19 19 20 1
LT-700 Package Contents LT-700-150 Contents • LT-700-150 (150 MHz) Listen Part Number LT-700-150 (150 MHz) Optional Accessories See page 20 3
LT-700 Specifications Architectural Specifications The portable FM transmitter shall be capable of broadcasting on 32 channels. The unit shall incorporate a microphone sensitivity switch. The device shall broadcast on both wide and narrow band channels with a SNR of 80 dB or greater. The device shall have an audio frequency response of 50 Hz to 15 KHz (±3 dB). The device will incorporate a mute switch. The battery door shall be capable of being mechanically locked.
LT-700 Quick Reference LT-700 Front MUTE / TALK switch (more information on page 9) 3.5 mm Input Jack A Listen microphone or line level cable connects here. Look & Listen Display™ The display shows level, channel, battery status, PROGRAM mode, whether a channel is locked, and whether a channel is locked out from selection (PROGRAM mode). See close-up below. 150 Use UP and DOWN buttons to select a channel. Press and hold either button for 5 seconds to lock the channel.
LT-700 Quick Reference LT-700 Inside Access Door Battery Select Switch SQ Switch Mic Sensitivity Switch Mic Sensitivity Switch - it arrives set at MED, which will work for most microphones. If your mic level is too low, change the switch to HI; if the level is too high, switch to LO. (see page 7 for more information) Battery Select Switch - place in NiMH position ONLY if you are using Nickel Metal Hydride batteries, otherwise, leave it in the Alkaline position.
LT-700 Setup Instructions 1 Remove the product Remove outer packaging and plastic cover. Inspect for physical damage. If damage is apparent, please contact Listen Technologies Corporation technical support for assistance. See page 19 for contact information. 2 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 1/4 turn counterclockwise.
LT-700 Setup Instructions (cont.) 6 Place Batteries in Unit Place two (2) AA batteries in the compartment, making note of the battery polarity shown in the battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position for the batteries you are using. (ALK should be selected for all battery types other than NiMH). NOTE: Listen uses 2300mAh (milli-Amp-hour) constant current NiMH (Nickel Metal Hydride) batteries.
LT-700 Operating Instructions 1 Make sure the unit is on When you press the power button, the LED on top of the unit will be illuminated and the LCD display will be visible. 2 Select the channel for transmitting Please refer to Channel Selection on page 13 for guidelines on choosing an interference-free channel. To select a channel, press either the channel UP or DOWN button until the display reads the channel you want. To lock your selection, press and hold the UP or DOWN button for 5 seconds.
LT-700 Programming Instructions The LT-700 can be programmed to transmit on a limited number of channels. For applications where users are required to select a channel (such as classrooms or language interpretation), and you don’t want them to have to scroll through all of the available channels, this feature is ideal. You can set up the LT-700 so that only the channels they need to use are available for selection with the UP and DOWN buttons.
LT-700 Charging Batteries The LT-700 and all Listen receivers are unique because they have SmartCharge™ chargers built in. When any of these units are connected to an LA-208 wall transformer or dropped into a Listen charging case, NiMH batteries will be charged. 1 To charge the batteries using the LA-208 wall transformer, plug the transformer into the jack marked “PWR/CHG” on the side of the unit. The unit can be operated while the batteries are charging.
LT-700 Wall Transformer Operation The LT-700 will operate normally when connected to a wall transformer. Use Listen part number LA-208, available from any Listen dealer. Connect the wall transformer to the jack on the side of the LT-700 marked “PWR/CHG” and plug the wall transformer into a grounded AC outlet. You do not need to have batteries installed in the LT-700 to operate it with a wall transformer.
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. Listen to the audio through the headphone or on a Listen receiver or receiver / speaker. Choose a channel with the least amount of interface. Unless you are interfacing with an existing narrowband transmission system, always use a wide band channel.
Listen SQ™ - 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 should receive a strong and consistent signal from the originating transmitter. The following strategies should be used maximize this signal: a. When using your system, keep in mind that the location of both the transmitter and receiver is critical to maximizing signal strength. b. Eliminate or minimize obstructions between the transmitter and the receivers. c.
150 MHz Compatibility 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 16 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-700 Troubleshooting Troubleshooting The LT-700 has no power Make sure the unit has fully charged batteries, or has a Listen LA-208 wall transformer connected to it. Press the ON button. If this does not work, try a different set of batteries. Make sure the batteries are installed correctly. There is no audio Make sure the MUTE/TALK switch is in the TALK position. Make sure you have the microphone plugged all the way in to the input jack.
LT-700 Troubleshooting (cont.) Troubleshooting There is not sufficient range The LT-700 is a portable transmitter that uses the microphone cable as an antenna and the range will vary depending on the location of the receivers compared to the transmitter. You can only expect about 100 feet of average effective working range. It’s confusing for users to have 32 channels when switching between channels Use the PROGRAM function to lock out unwanted channels.
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 Microphone Accessories LA-261 Microphone LLavalier li Mi h LA-276 Collar Microphone LA-262 Over-the-Head Microphone LA-277 Conferencing Microphone LA-270 Noise Canceling Microphone LA-278 Behind-the-Head Microphone LA-272 Over-the-Head Mic w/ Earphone LA 2 LA-2 LA-279 Over-the-Ear Microphone Presentation Style LA-274 Hand-Held Microphone LA-263 Line/Mic Y Input Cable for LT-700 Accessories LA-361 High Capacity AA Alkaline Batteries (2) LA-311 LA-313 LA-317 LA-318 LA-320 LA-3
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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.
