Listen Technologies LT-700-150 User manual

LT-700-150 1
Listen Technologies Corporation All rights reserved 20091001
Listen Technologies Corporation • 14912 Heritagecrest Way • Bluffdale • Utah 84065-4818 U.S.A.
+1.801.233.8992 • 1.800.330.0891 North America •+1.801.233.8995 Fax
LT-700-150
Portable FM Display Transmitter
The Listen LT-700 Portable Transmitter is used to wirelessly broadcast audio for a variety of portable applications. Whether its voice or music,
the user can broadcast audio to everyone in the audience without having to carry a microphone or be plugged into a wall. The LT-700 is
excellent for factory tours, outdoor events, wireless microphone applications, classrooms, training, or personal use – anywhere amplified sound
is needed, and no installed system is present. With the many features of the LT-700, portable transmission has never been easier for users!
Configurations
LT-700-150
Highlights Includes
Used With
Architectural Specifications
• Portable transmission – Broadcast the interpreter or tour guide’s
voice to everyone in the audience without having to carry a
microphone or be plugged into a wall.
• Superior Audio Quality – 80 dB signal-to-noise ratio, setting the
industry’s sound quality standard.
• With a choice between 32 channels, Listen products are ideal for
a wide range of applications.
• 100 % Digital – Listen receivers are digitally-tuned so transmission
won’t drift; assurance that when a channel is selected, it stays on
that channel.
• Uses standard alkaline or NiMH batteries – Built in SmartCharge™
won’t allow batteries to overcharge (NiMH batteries only).
• Look & Listen™ LCD shows channel, battery status, and
programming information.
• Up to six (6) simultaneous transmitted channels.
LT-700-150 Portable Display FM Receiver (150 MHz)
Quick Reference Card
LR-400-150 Portable Display FM Receiver (150 MHz)
LR-500-150 Portable Programmable Display FM Receiver (150 MHz)
LT-700-150 Portable FM Display Transmitter
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.

LT-700-150 2
Listen Technologies Corporation All rights reserved 20091001
Listen Technologies Corporation • 14912 Heritagecrest Way • Bluffdale • Utah 84065-4818 U.S.A.
+1.801.233.8992 • 1.800.330.0891 North America •+1.801.233.8995 Fax
LT-700-150
Portable FM Display Transmitter
Functionality Quick Reference
Battery Level Indicator
Channel Display: Displays the
current channel.
RF Output
Indicator: Indicates
the RF transmit level.
Lock Icon: Indicates the unit is
locked on current channel.
L/O: Indicates while in
programming mode the specific
channel has been locked out.
PGM: Program
function is in
process.
150
Power Button: Turns unit On/Off.
3.5 mm Input Jack: Connect
a Listen microphone here.
Look&Listen™ Display: Shows
transmit level, channel,
programming, battery status,
and lock status.
Battery Compartment:
Place two (2) AA batteries
in compartment. Be sure to
follow polarity pattern.
Mute On/Off Switch
Battery Select Switch: Choose
the type of batteries being
used - Alkaline or NiMH.
Power/Charging Port
Front Door Lock
LED: When lit, unit is on. When batteries are
low, charging, or unit is muted the LED flashes.
Channel Select UP/DOWN
Mic Sensitivity Switch:
Adjust Mic sensitivity to
High, Medium, or low.
SQ™ Switch: Turns SQ™ On/Off.

LT-700-150 3
Listen Technologies Corporation All rights reserved 20091001
Listen Technologies Corporation • 14912 Heritagecrest Way • Bluffdale • Utah 84065-4818 U.S.A.
+1.801.233.8992 • 1.800.330.0891 North America •+1.801.233.8995 Fax
LT-700-150
Portable FM Display Transmitter
Specifications*
Audio
RF Frequency Range 150.8000 MHz - 152.3500 MHz
Number of Channels 6 wideband, 26 narrowband
Number of Simultaneous
Transmitters Six (6)
Frequency Accuracy ± .005% stability 32 to 122º (0 to 50ºC)
Transmitter Stability 50 PPM
Transmission Range up to 45.7 m (150 ft.)
Output Power 10 mW maximum
Antenna Uses microphone cable
Antenna Connector 3.5 mm connector
Compliance C-Tick
System Frequency
Response 50 Hz - 15 kHz (±3dB)
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; 6db increments
Line Input Unbalanced, ring of 3.5mm connector, -10 dbu nominal input level,
-3 dbu maximum, impedance 10K ohms
Microphone Power 3VDC Bias
Controls &
Indicators
User Controls Power, mute, channel UP/DOWN
Set-up Controls (battery
compartment) Mic sensitivity, NiMH/alkaline battery, SQ enable/disable
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 <250mA.
Drop in contact points for use with Listen charging cases
Power Supply Compliance RoHS, WEEE, UL, PSE, CE, CUL, TUV, CB compliant
Physical
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
Environmental
Temperature - Operation 14 to 104º F (-10 to 40º C)
Temperature - Storage -4 to 122° F (-20 to 50° C)
Humidity 0 to 95% relative humidity, non-condensing
*Specifications are subject to change without notification.