Listen Technologies LT-700-150 manual LT-700 Specifications, Architectural Specifications

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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. The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, and RF signal strength. The device shall be able to enable companding. The unit shall operate off of two (2) AA batteries; alkaline or NiMH. 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-700-150 is specified.

Specifications*

Audio

RF Frequency Range

150.8000 MHz - 152.3500 MHz

 

 

Number of Channels

6 wideband, 26 narrowband

 

 

Number of Simultaneous

Six (6)

Transmitters

 

 

 

Frequency Accuracy

± .005% stability 32 to 122º (0 to 50ºC)

 

 

Transmitter Stability

50 PPM

 

 

Transmission Range

up to 45.72 m (150 ft.)

 

 

Output Power

10 mW maximum

 

 

Antenna

Uses microphone cable

 

 

Antenna Connector

3.5 mm connector

 

 

Compliance

C-Tick

 

 

System Frequency

50 Hz - 15 kHz (±3dB)

Response

 

 

 

System Signal to Noise Ratio

SQ enabled 80 dB, SQ disabled 60 dB

 

 

System Distortion

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

 

 

Microphone Input

Unbalanced, tip of 3.5mm connector, -20 dbu nominal, -30 dbu maximum, impedance 21 ohms

 

 

Microphone Sensitivity

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

 

 

Line Input

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

 

 

Microphone Power

3 VDC Bias

 

 

Controls & Indicators

User Controls

Power, mute, channel UP/DOWN

 

 

Set-up Controls (battery

Mic sensitivity, NiMH/alkaline battery, SQ enable/disable

compartment)

 

 

 

Programming

Channel lock out, Channel lock

 

 

LED

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

 

 

Display

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

 

 

Power

Battery Type

Two (2) AA batteries, alkaline or NiMH

 

 

Battery Life (Listen batteries)

15 hours alkaline (LA-361), 8 hours NiMH rechargeable (LA-362)

 

 

Battery Charging (NIMH only)

Fully automatic, 13 hours

 

 

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 <250 mA.

 

Drop in contact points for use with Listen charging cases

Power Supply Compliance

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

 

 

 

Dimensions (H x W x D)

3.00 x 1.00 x 5.00 in. (7.6 x 2.5 x 13.0 cm)

 

 

 

 

Color

Dark Grey with white silk screening

 

 

 

Physical

Unit Weight

3.9 oz (111g)

 

 

Unit Weight with batteries

5.8 oz (164g)

 

 

 

 

 

Shipping Weight

1.0 lbs. (0.45kg)

 

 

 

 

Door

Manually Lockable (on sides). Up, down, and power buttons through door

 

 

 

 

 

* Specifications are subject to change without notification.

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Contents Page Page Page Page LT-700 Table of Contents Page LT-700 Package Contents LT-700 Specifications Architectural SpecificationsLT-700 Quick Reference LT-700 FrontLT-700 Inside Access Door LT-700 Setup Instructions Optional Connect the Line Input Cable Place Batteries in UnitConnect the Microphone LT-700 Operating Instructions Enter Program Mode To exit Program modeLT-700 Programming Instructions Scroll Through Channels to Lock or UnlockLT-700 Charging Batteries LT-700 Wall Transformer Operation Channel Selection Wide Band RecommendationListen SQ Improving your Listening Experience RF Reception Maximization Strategies MHz Compatibility Chart LT-700 Troubleshooting My batteries are not charging There is not sufficient rangeCannot change the channel Warranty & Contacting Listen WarrantyOptional Accessories Microphone Accessories

LT-700-150 specifications

Listen Technologies LT-700-150 is a state-of-the-art assistive listening transmitter designed to enhance the listening experience in various settings, such as theaters, conference rooms, and classrooms. This device stands out for its robust features and advanced technologies, making it an ideal choice for venues that prioritize accessibility and high-quality audio transmission.

One of the primary features of the LT-700-150 is its exceptional audio clarity. The transmitter operates on a broad frequency range, ensuring that it delivers crisp and clear sound quality to listeners. With a frequency response of 20Hz to 20kHz, this device captures the full spectrum of audio, which is particularly beneficial in environments with diverse sound requirements.

The LT-700-150 incorporates advanced digital processing technology, which minimizes distortion and enhances audio fidelity. This is crucial in settings where clear communication is imperative, especially for individuals with hearing impairments. The unit is designed to transmit audio over a range of up to 500 feet, making it suitable for large venues without compromising on sound quality.

Another notable characteristic of the LT-700-150 is its versatility. The device allows for easy integration into existing audio systems, thanks to its multiple input options, including microphone and line-level inputs. This flexibility makes it an excellent choice for various applications, from live performances to guided tours.

The transmitter is also equipped with a built-in limiter to prevent sudden audio spikes, which can be jarring for listeners. This feature ensures a consistent listening experience, further enhancing user comfort. Additionally, the LT-700-150 includes an automatic frequency selection feature, which scans available channels to find the clearest transmission path, helping to avoid interference from other electronic devices.

User-friendly design is another aspect of the LT-700-150, featuring a straightforward interface with clearly labeled controls. This allows operators to adjust settings quickly and efficiently, optimizing the listening experience for all users.

In summary, the Listen Technologies LT-700-150 is a sophisticated transmission device that excels in delivering high-quality audio in a variety of settings. Its advanced features, excellent sound quality, and ease of use make it an indispensable tool for ensuring accessibility and enhancing communication. Whether in a theatrical performance or an educational environment, the LT-700-150 addresses the needs of listeners, providing clarity and convenience like no other.