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Listen LT-700 User Manual

Portable transmitter
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User's Manual
LT-700 Portable Transmitter
Listen Technologies Corporation
D o n ' t m i s s a s i n g l e s o u n d . L i s t e n .
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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  • Page 1 D o n ’ t m i s s a s i n g l e s o u n d . L i s t e n . 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...
  • Page 2 Toll Free (North America): 1.800.330.0891 E-Mail: support@ListenTech.com Web: www.ListenTech.com Thank you... and enjoy your listening experience! Best regards, The Listen Team Listen™ and the Listen Logo are registered trademarks of Listen Technologies Corporation. LT-700_2004_02_18 © 2004 Listen Technologies Corporation. All Rights Reserved.
  • Page 3 LT-700 Package Contents Listen Part Number · LT-700-072 (72MHz or 216MHz) 72 MHz: LT-700-072 · Warranty Card 216 MHz: LT-700-216 · User Manual Optional Accessories See pages 32-33.
  • Page 4 this page intentionally left blank...

  • Page 5: Table Of Contents

    Table of Contents Architectural Specifications ..........2 Specifications .

  • Page 6: Architectural Specifications

    The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, channel lock ,program mode, channel lock status and RF signal strength. The portable transmitter shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LT-700 is specified. Specifications...
  • Page 7 Specifications continued Specification LT-700-072 LT-700-216 ** All system specifications are wireless end-to-end System Frequency Response 63Hz - 15kHz (± 3dB) 63Hz - 10kHz (±3dB) System Signal to Noise Ratio SQ enabled: 80dB; SQ disabled 60dB SQ enabled: 80dB; SQ disabled 50dB...

  • Page 8: Quick Reference

    Quick Reference LT-700 Front MUTE / TALK switch 3.5mm Input Jack (more information on page 5) Look & Listen Display™ A Listen microphone or line The display shows level, channel, level cable connects here. battery status, PROGRAM mode, whether a channel is locked, and whether a channel is locked out from selection (PROGRAM mode).
  • Page 9 Quick Reference LT-700 Top of Unit LT-700 Inside Access Door SQ Switch Mic Sensitivity Battery Select Switch Switch MUTE / TALK switch - this mutes the mic only and not the line input when in the mute position. LED indicators:...
  • Page 10 Quick Reference LT-700 Look & Listen™ Display When dots are illuminated, the microphone Indicates the currently is active. If this display does not appear, tuned channel the microphone is muted. Battery level indicator. The indi- cator flashes, along with the red...

  • Page 11: Lt-700 Setup Instructions

    LT-700 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 support for assistance. See page 29 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.
  • Page 12 Set Mic Sensitivity Switch The microphone sensitivity switch is located inside the battery compart- ment, to the left of the BATTERY selection switch. The LT-700 is shipped with this switch in the center (MED) position. Listen recommends the following settings for our microphones. If you are using a microphone from another vendor, you may need to experiment with different settings.
  • Page 13 Hydride) batteries. These may be purchased from your Listen dealer (ask for part number LA- 362). Connect the Microphone The microphone jack is located on top of the unit. The LT-700 uses the microphone cable as an antenna for transmitting. LA-268 Over-the-Ear Microphone...
  • Page 14 Cable (it is not included with your unit). This cable allows you to con- nect both a microphone and line input to the jack on top of the LT-700. See the diagram below for connection information. You can use the microphone and the line input at the same time.

  • Page 15: Operating Instructions

    72MHz Units The LT-700-072 operates on 17 wide band channels and 40 narrow band channels. Channels represented by letters in the display (i.e. A) are wide band channels; channels represented by numbers are narrow band channels.
  • Page 16 When the microphone audio is muted, the LED on top of the unit flashes rapidly. Slide the switch back to the talk position and the microphone audio will return to the transmission. If you are using line level audio, it will not be effected by the mute/talk switch. LT-700 Shown in the TALK position...

  • Page 17: Programming Instructions

    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.

  • Page 18: Charging Batteries

    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 Connect LA-202 to an LA-202 wall transformer or dropped into a Listen charging case, here and plug it NiMH batteries will be charged.
  • Page 19 13-hour charge cycle over again. When not using the LT-700, it is recommended to leave the unit on the charger. The charger provides a “maintenance” charge that keeps the battery at 100%. If the unit is not on the charger, the battery will lose up to 20% of its charge per month.

  • Page 20: Operation With A Wall Transformer

    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. NOTE: If batteries are in the unit ensure that the battery selection switch is set properly as shown on page 5.

  • Page 21: Supplementary Information

    Supplementary Information Channel Selection ............18 Listen SQ™...

  • Page 22: Channel Selection

    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 (lettered channels at 72MHz and channels that start with a “2” for 216MHz when using a Listen receiver).
  • Page 23 Channel Selection continued It is highly recommended that after channel selection has been achieved, you Wide Band Recommendation lock the channel so that it cannot be changed by the user. To accomplish LOCK Listen recommends that you always use a on the LT-800, press both the UP and DOWN buttons simultaneously for 5 sec- wide band channel unless you need to be onds.

  • Page 24: Listen Sq

    Listen SQ™ We are accustomed to listening to low noise, high fidelity audio (delivered via SQ Summary CD, DVD, etc.). FM radio systems, such as those made by Listen, have more · Improves noise performance by at inherent noise compared to most sound systems. To reduce noise of our sys- least 20dB tems, Listen uses a noise reduction technology called ListenSQ™.

  • Page 25: Rf Reception Maximization Strategies

    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.

  • Page 26: 72 Mhz Frequency Compatibility Table

    72MHz Compatibility Chart Wide band frequencies in shaded sections *Parenthesis indicate T35 and T20 narrowband. Frequency Phonic Listen Comtek Phonak Williams* Gentner Telex Drake 72.0250 (11, 1) 72.0500 72.0750 (12, 3) 72.1000 A, (13, 4) 72.1 72.1250 (14, 5) 72.1500 72.1750 (15, 7) 72.2000...
  • Page 27 72MHz Compatibility Chart continued Wide band frequencies in shaded sections *Parenthesis indicate T35 and T20 narrowband. Frequency Phonic Listen Comtek Phonak Williams* Gentner Telex Drake 74.6250 (36, 40) 74.6500 (41) 74.6750 (37, 42) 74.7000 I, (38, 43) 74.7250 (39, 44) 74.7500 (45) 74.7750...

  • Page 28: 216 Mhz Frequency Compatibility Table

    216MHz Compatibility Chart Wide band frequencies in shaded sections Frequency Phonic Light Listen Comtek Phonak Williams Gentner Speed 216.0125 216.0250 216.0375 216.0625 216.0750 216.0875 216.1125 216.1250 216.1375 216.1625 216.1750 216.1875 216.2125 216.2250 216.2375 216.2625 216.2750 216.2875 216.3125 216.3250 216.3375 216.3625 216.3750 216.3875 216.4125...
  • Page 29 216MHz Compatibility Chart continued Wide band frequencies in shaded sections Frequency Phonic Light Listen Comtek Phonak Williams Gentner Speed 216.5375 216.5625 216.5750 216.5875 216.6125 216.6250 216.6375 216.6625 216.6750 216.6875 216.7125 216.7250 216.7375 216.7625 216.7750 216.7875 216.8125 216.8250 216.8375 216.8625 216.8750 216.8875 216.9125 216.9250...

  • Page 30: Troubleshooting

    (the switch is located inside the battery compartment of the unit). If you are using a line level input, try turning down the level of the input. If you are using any equipment that does not have SQ capability, turn off SQ in the LT-700. There is hum in the audio The microphone may be too close to a transformer.
  • Page 31 If your receivers all have SQ capability, activate SQ in all units by moving their switches to the ON position. In the LT-700 and all SQ-equipped receivers, the SQ switch is located inside the bat- tery compartment. See page 20 for more information.
  • Page 32 LT-700 Troubleshooting continued 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.

  • Page 33: Compliance Notice

    Listen’s LT-700 Transmitter (216MHz only) Listen’s LT-700 transmitter is authorized by rule under the Low Power Radio Service (47 C.F.R. Part 95) and must not cause harmful interference to TV reception or United States Navy SPASUR installations.

  • Page 34: Fcc Statement

    FCC Statement This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.

  • Page 35: Warranty

    Warranty Listen Technologies Corporation (Listen®) warrants the LT-700 Portable Transmiter 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. This warranty is only available to the original end purchaser of the product and cannot be transferred.

  • Page 36: Optional Accessories

    Optional Accessories LT-700 Microphones Lavalier Conference Over-the-Ear Hand Held LA-261 LA-277 LA-268 LA-274 Over-the-Head Collar Noise Canceling LA-262 LA-276 LA-270...
  • Page 37 Optional Accessories Microphones with Active Earphones Over-the-Head Mic Over-the-Ear Mic with with Earphone Earphone LA-272 LA-273 Use Both an Audio Source and Mic Line/Microphone “Y” Cable These headsets combine cabling for both a LA-263 transmitter and a receiver...
  • Page 40 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...

This manual is also suitable for:

Lt-700-072Lt-700-216Lt-700-072Lt-700-216

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