4
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*
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 45.72 m (150 ft.)
Output Power 10 mW maximum
Antenna Uses microphone cable
Antenna Connector 3.5 mm connector
Compliance C-Tick
System Frequency
Response
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; 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
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 <250 mA.
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
* Specifi cations are subject to change without notifi cation.
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