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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 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...
  • Page 2 Should you have any comments on how we might improve our products or our service, we’re here to listen. Here’s how to reach us: Telephone: +1.801.233.8992 Fax: 1.801.233.8995 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™...
  • Page 3 LT-700 Package Contents · LT-700-072 (72MHz or 216MHz) · Warranty Card · User Manual Optional Accessories See pages 32-33. Listen Part Number 72 MHz: LT-700-072 216 MHz: LT-700-216...
  • 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 Shipping Weight Door Temperature - Operation Environmental Temperature - Storage Humidity LT-700-072 ** All system specifications are wireless end-to-end 63Hz - 15kHz (± 3dB) 63Hz - 10kHz (±3dB) SQ enabled: 80dB; SQ disabled 60dB SQ enabled: 80dB; SQ disabled 50dB <2% total harmonic distortion (THD) at 80% deviation...

  • Page 8: Quick Reference

    Quick Reference LT-700 Front 3.5mm Input Jack A Listen microphone or line level cable connects here. Use UP and DOWN buttons to select a channel. Press and hold either button for 5 seconds to lock the channel. Press and hold either button again to unlock.
  • Page 9 Quick Reference LT-700 Inside Access Door Battery Select SQ Switch Mic Sensitivity Switch Switch Mic Sensitivity Switch - it arrives set at MID, 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.
  • Page 10 Quick Reference LT-700 Look & Listen™ Display When dots are illuminated, the microphone is active. If this display does not appear, the microphone is muted. Indicates the unit is in PROGRAM mode (see next page). To enter PROGRAM mode, press and hold the UP and DOWN keys until the PGM icon appears in the dis- play.

  • 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 to an LA-202 wall transformer or dropped into a Listen charging case, 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

    If you are using multiple channels follow this process: a. Same Space If you are using multiple transmitters in the same space, the most number of channels that will work simultaneously is six at 72MHz and three at 216MHz. With all of the transmitters off, listen for interference on all the wide band channels via the headphone jack on a Listen receiver.
  • Page 23 Repeat the process to unlock. Notes in regard to using 72MHz and 216MHz systems: i. 72MHz in a secondary frequency band. This means that other transmitters are licensed to use these frequencies. Thus, you may experience interference from paging transmitters and other types of transmissions. You will need to find a clear channel by listening to all the wide band channels.

  • Page 24: Listen Sq

    Listen SQ™ We 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 reduce noise of our sys- 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 72.0250 72.0500 72.0750 72.1000 72.1250 72.1500 72.1750 72.2000 72.2250 72.2500 72.2750 72.3000 72.3250 72.3500 72.3750 72.4000 72.4250 72.4500 72.4750 72.5000 72.5250 72.5500 72.5750...
  • Page 27 72MHz Compatibility Chart continued Wide band frequencies in shaded sections *Parenthesis indicate T35 and T20 narrowband. Frequency Phonic Listen Comtek Phonak Williams* 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 (40, 46) 75.2250 (41, 47)

  • Page 28: 216 Mhz Frequency Compatibility Table

    216MHz Compatibility Chart Wide band frequencies in shaded sections Frequency Phonic Listen Comtek 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 216.4250 216.4375 216.5125 216.5250 Chart continued on next page...
  • Page 29 216MHz Compatibility Chart continued Wide band frequencies in shaded sections Frequency Phonic Listen Comtek Phonak 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 216.9375 216.9625 216.9750 216.9875...

  • 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 Over-the-Ear LA-261 LA-268 Over-the-Head LA-262 Conference Hand Held LA-277 LA-274 Collar Noise Canceling 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...

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