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Listen Technologies Portable Display RF Transmitter, 72 MHz
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Listen Technologies LT-700-072 Portable Display RF Transmitter, 72 MHz

SKU: LTLT700072
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Listen Technologies LT-700-072 Specifications

Audio

Audio

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  • Frequency Response

    50 Hz - 15 kHz ( +/-3 dB)

  • Signal-to-Noise Ratio

    SQ enabled: 80dB; SQ disabled 60dB

  • Distortion

    < 2% total harmonic distortion (THD) at 80% deviation

  • Microphone Input

    Unbalanced, tip of 3.5 mm connector, -45 dBu nominal input level, -30 dBu maximum, impedance 20k Ohms

  • Microphone Sensitivity

    Three position switch: high, middle, and low; 6db increments

  • Microphone Power

    5VDC Bias

  • Line Input

    Unbalanced, ring of 3.5mm connector, -10 dbu nominal input level, -3 dbu maximum, impedance 10K ohms

Controls

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  • User Controls

    Power, mute, channel UP/DOWN, Mic sensitivity, NiMH/alkaline battery, SQ enable/disable

  • Programming

    Channel Lock out,Channel lock

Indicators

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  • LCD

    Channel Designation, lock status, signal strength indication, battery life, RF Power

  • LEDs

    Red, illuminated when unit is on. Flashes when batteries are low, or to indicate charging. Flashes when muted

RF

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  • Frequency Range

    72.025 - 75.950 MHz

  • Number of Channels

    17 wide band, 40 narrow band

  • Frequency Accuracy

    +/- .005% stability 32 to 122 Degree (0 to 50 Degree C)

  • Antenna Type

    Microphone cable

  • Transmitter Stability

    50 PPM

  • Transmission Range

    From 0 to 150' (45.7m)

  • Antenna Connector

    3.5 mm connector

  • Output Power

    Less than 10mW

  • Number of Simultaneous Transmitters

    6

Power

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  • Power Supply

    I/P 120VAC; O/P 7.5VDC 250 mA; Drop in contact points for use with charging cases. Power supply not included (LA-208)

  • Power Supply Connector

    2.3mm OD by 0.7mm ID, barrel type connector 7.5 VDC, center positive < 250mA. Drop in contact points for use with Listen charging cases

  • Battery Type

    Two AA batteries, alkaline or NiMH

  • Battery Life

    15 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)

  • Battery Charging Time

    Fully automatic, 13 hours

  • Compliance

    RoHS, WEEE, UL, PSE, CE, CUL, TUV, CB compliant

Environmental

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  • Temperature - Operation

    14 Degree F (-10 Degree C) to +104 Degree F (40 Degree C)

  • Temperature - Storage

    -4 Degree F (-20 Degree C) to +122 Degree F (50 Degree C)

  • Relative Humidity

    0 to 95% relative humidity, non-condensing

Compliance

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  • RF

    FCC Part 15, Industry Canada

Physical

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  • Door

    Manually lockable, controls accessible through doors

  • Color

    Dark Gray with white silk screening

  • Compatibility

    LR-100-072, LR-400-072, LR-500-072, LA-208, LA-277, LR-4200-072, LR-5200-072-P1, LR-5200-072, LR-4200-072-P1, LP-40-072-01, LP-41-072-01, LP-50-072-01, LP-51-072-01, LDS-5200-072, LDS-4200-072, LDS-4200-072-P0, LDS-4200-072-P1

  • Dimensions (W x H x D)

    3 x 5 x 1" (7.6 x 13 x 2.5cm)

  • Weight

    3.9 oz (111g)
    With Batteries: 5.8 oz (164g)

About Listen Technologies LT-700-072

Designed for a variety of portable assistive listening applications, the LT-700 Portable Display RF Transmitter delivers the highest level of performance for all needs. Whether transmitting voice or music, the LT-700 offers a clear, reliable signal for use in environments without an installed assistive listening system.

Wireless audio is easily and clearly picked up by any of our Listen Portable receivers, allowing you to meet your needs easily and effectively. From outdoor events to classrooms, factory tours to training spaces and more, the LT-700 is the ideal portable transmitter for nearly any setting.

Architectural Specs
The portable RF display transmitter shall be capable of broadcasting on 57 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 at 72 MHz, or of 50 Hz to 10 kHz, ' +/-3 dB at 216 MHz. The device will incorporate a mute switch. The battery door shall be capable of being mechanically locked.

The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, and RF signal strength. The portable transmitter shall incorporate automatic battery charging circuitry for recharging of NiMH batteries, with the ability to charge via a wall transformer or drop in charging case. The Listen LT-700-072 or LT-700-216 is specified.

Listen Technologies LT-700-072 Features

  • Transmits up to six (6) channels of audio simultaneously on the 72 MHz band
  • Offers a choice between 57 different channels for flexibility and ease of setup
  • 80 dB signal-to-noise ratio provides superior audio quality
  • 100% digital signal output ensures a reliable connection to any and all receivers in use
  • Compatible with standard AA alkaline and NiMh rechargeable batteries
  • Easy-to-read Look & Listen (TM) LCD display with battery level, selected channel, and programming information
  • Built-in SmartCharge (TM) prevents batteries from overcharging Mic and/or line-level inputs
  • Mute switch

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Key Features

  • Transmits up to six (6) channels of audio simultaneously on the 72 MHz band
  • Offers a choice between 57 different channels for flexibility and ease of setup
  • 80 dB signal-to-noise ratio provides superior audio quality
  • 100% digital signal output ensures a reliable connection to any and all receivers in use
  • Compatible with standard AA alkaline and NiMh rechargeable batteries
  • Built-in SmartCharge (TM) prevents batteries from overcharging Mic and/or line-level inputs

What's in the box:

  • LT-700-072 Portable Display RF Transmitter (72 MHz)
  • Owner's Manual
  • Listen Technologies Lifetime Limited Warranty