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 Listen Technologies Simultaneous Interpretation Transmitter LT-700 Specifications
LT 700 b
  Specification LT-700-072 LT-700-216
RF RF Frequency Range 72.025 - 75.975 MHz 216.025 - 216.987 MHz
Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow)
Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD
Frequency Accuracy ±.005% stability 0° to 50°C (32° to 122° F)
Transmitter Stability 50 PPM
Transmission Range From 0ft to 50ft(15.2m) -150 ft (45.7m)
Output Power Less than 10mW Less than 100mW
Antenna Uses microphone cable
Antenna Connector 3.5mm connector
Compliance FCC Part 15, Industry Canada
Audio ** All system specifications are wireless end-to-end
System Frequency Response 63Hz - 15kHz (± 3dB) 63Hz - 10kHz (±3dB)
System Signal to Noise Ratio (A-weighted) SQ enabled: 80dB; SQ disabled 60dB SQ enabled: 80dB; SQ disabled 50dB
System Distortion 2% total harmonic distortion (THD) at 80% deviation
Microphone Input Unbalanced, tip of 3.5mm connector, (55 dBu nominal,
-32dBu maximum, impedance 21 Ohms)
Microphone Sensitivity Three position switch: high, middle and low; 6dB increments
Line Input  Unbalanced, ring of 3.5mm connector, (-10dB nominal input level adjustable, +4dBu maximum, impedance 10k Ohms)
Phantom Power 3VDC
Controls Set-up Controls, behind the door Microphone sensitivity, NiMH/alkaline battery, SQ enable/disable
User Controls Power, mute, channel UP and DOWN
Programming Unit can be programmed so that only desired channels are displayed to the user; channel selection can be locked by holding the UP or DOWN button 5 seconds.
Indicators LED Red, illuminates when unit is on.  Flashes when batteries are low,
or to indicate charging.  Flashes 2x when muted
LCD Display Channel, lock status, programming
Power Battery Type Two AA batteries, alkaline or NiMH
Battery Life (Listen batteries) 20 hours alkaline (LA-361), 10 hours NiMH rechargeable (LA-362)
Battery Charging (NiMH only) Fully automatic, 14 hours
Power Supply Connector 2.3mm OD by 0.7mm ID, barrel type connector.  7.5VDC, center positive 300mA.  Drop in contact points for use with Listen charging cases.
Compliance UL Listed
Physical Dimensions 3.0 in x 1.0 in x 5 in WxDxH (7.6cm x 2.5cm x
Unit Weight 3.9oz (111g)
Unit Weight with batteries 5.8 oz (164.4g)
Shipping Weight 1.0 lbs (0.45kg)
Door Manually lockable.  UP, DOWN and power through door,
other controls behind door (see Controls above)
Environmental Temperature - Operation -10° to 40°C (14° to 104° F)
Temperature - Storage -20° to 50°C (-4° to 122° F)
Humidity 0 to 95% relative humidity, non-condensing

The LR-700 carries a 90-Day Performance Guarantee and the Listen Limited Lifetime Warranty.


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