Listen Technologies LT-700-150 User Manual
Dear Valued Customer,
Thank you for choosing Listen! All of us at Listen are dedicated to providing
you with the highest quality products available. We take great pride in their
outstanding performance because we care that you are completely
satisfi ed. That’s why we independently certify them to the highest quality
standards and back them with a limited lifetime guarantee. We stand ready
to answer any questions you might have during installation or in the operation
of our products. Should you experience any problems whatsoever with your
Listen products, we are ready to help you in any way we can with prompt,
effi cient customer care. Because at Listen, it’s all about you! And 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:
+1.801.233.8992
+1.800.330.0891
+1.801.233.8995
North America
fax
support@listentech.com
www.listentech.com
Thank you and enjoy your listening experience!
Best regards,
Russell Gentner and the Listen Team
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repair turn-around-times and 85% of the time, clients were without their product for less than 10 days!
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Assistive Listening • Language Interpretation • Soundfi eld • Tour Group • Conferencing
LT-700 Table of Contents
Package Contents 3
150 MHz Specifi cations 4
Quick Reference 5
Setup Instructions 7
Operating Instructions 9
Programming Instructions 10
Charging Batteries 11
Wall Transformer Operation 12
Channel Selection 13
Listen SQ™ 14
RF Reception Maximization Strategies 15
150 MHz Frequency Chart 16
Troubleshooting 17
Warranty 19
Contact Information 19
Optional Accessories 20
1
LT-700 Package Contents
LT-700-150 Contents
• LT-700-150 (150 MHz)
Listen Part Number
LT-700-150 (150 MHz)
Optional Accessories
See page 20
3
LT-700 Specifi cations
Architectural Specifi cations
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 specifi ed.
Specifi cations*
RF Frequency Range 150.8000 MHz - 152.3500 MHz
Number of Channels 6 wideband, 26 narrowband
Audio
Number of Simultaneous
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
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
Six (6)
50 Hz - 15 kHz (±3dB)
Controls &
Indicators
Power
Physical
User Controls Power, mute, channel UP/DOWN
Set-up Controls (battery
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
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.
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
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
* Specifi cations are subject to change without notifi cation.
Mic sensitivity, NiMH/alkaline battery, SQ enable/disable
Drop in contact points for use with Listen charging cases
4
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