This product is discontinued and the information here is only for reference.
Portable Programable Display RF Transmitter (72 MHz)

Portable Display RF Transmitter (72 MHz) (S. Korea) (DISCONTINUED)

Item:LT-700-072KR
Discontinued

The Listen LT-700 Portable Display RF Transmitter is used to wirelessly broadcast audio for a variety of portable applications. Whether its voice or music, you can broadcast your 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 you need to amplify sound, but don’t have (or want) an installed system. With the many features of the LT-700, portable transmission has never been easier for users!

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Includes

One (1) LT-700 Portable Display RF Transmitter

Highlights

  • Superior Audio Quality – 70 dB signal-to-noise ratio, setting the industry’s sound quality standard
  • A choice between 21 channels, complete antenna and accessory options make Listen products ideal for a wide range of applications
  • Look & Listen™ LCD shows channel, battery status, and programming information
  • 100 % Digital – Listen receivers are digitally-tuned so transmission won’t drift; assurance that when you select a channel, it stays on the channel
  • Transmit up to eight (8) channels simultaneously on 72 MHz
  • Uses standard alkaline or NiMH batteries
  • Transformer charging plug or drop in charging contacts
  • Built in SmartCharge™ won’t allow batteries to overcharge. Charging circuitry is conveniently built into Listen’s LT-700 Transmitter; never worry about unplugging a transformer at a certain time
  • Mute switch
  • Mic and/or line level inputs
  • Limited Lifetime Warranty with hassle-free support

Specs

+Audio

Frequency Response50 Hz - 15 kHz (±3 dB)
Signal-to-Noise RatioSQ enabled: 70dB; SQ disabled 50dB
Distortion< 2% total harmonic distortion (THD) at 80% deviation
Microphone InputUnbalanced, tip of 3.5 mm connector, -45 dBu nominal input level, -30 dBu maximum, impedance 20k Ohms
Microphone SensitivityThree position switch: high, middle, and low; 6db increments
Microphone Power5VDC Bias
Line InputUnbalanced, ring of 3.5mm connector, -10 dbu nominal input level, -3 dbu maximum, impedance 10K ohms

+Controls

User ControlsPower, mute, channel UP/DOWN, Mic sensitivity, NiMH/alkaline battery, SQ enable/disable
ProgrammingChannel Lock out,Channel lock

+Indicators

LCDChannel Designation, lock status, signal strength indication, battery life, RF Power
LEDsRed, illuminated when unit is on. Flashes when batteries are low, or to indicate charging. Flashes when muted

+RF

Frequency Range72.650 - 74.750 MHz
Number of Channels21 channels
Frequency Accuracy± .005% stability 32 to 122º (0 to 50ºC)
Antenna TypeMicrophone cable
Transmitter Stability50 PPM
Transmission RangeUp to 45.7 m (150 ft.)
Antenna Connector3.5 mm connector
Output PowerLess than 10mW
Number of Simultaneous Transmitters8 (use channels 1 - 8)

+Power

Power SupplyI/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 Connector2.3mm OD by 0.7mm ID, barrel type connector 7.5 VDC, center positive < 250mA. Drop in contact points for use with Listen charging cases
Battery TypeTwo AA batteries, alkaline or NiMH
Battery Life15 hours alkaline (LA-361), 8 hours NiMH rechargeable (LA-362)
Battery Charging TimeFully automatic, 13 hours
ComplianceKCC

+Physical

Width3.00 in. (7.6 cm)
Height5.00 in. (13.0 cm)
Depth1.00 in. (2.5 cm)
ColorDark Grey with white silk screening
Unit Weight with Batteries5.8 oz. (164 g)
Shipping Weight1.0 lbs. (0.5 kg)
Weight3.9 oz. (111 g)
DoorManually lockable, controls accessible through doors

+Environmental

Temperature - Operation14 to 104º F (-10 to 40º C)
Temperature - Storage-4 to 122° F (-20 to 50° C)
Relative Humidity0 to 95% relative humidity, non-condensing

Accessories

A picture of two (2) High Capacity AA Alkaline Batteries.

High Capacity AA Alkaline Batteries (2)

SKU: LA-361
Two batteries - one black that reads Commercial Grade NiMH Rechargeable AA Battery in white lettering, and blue one that says Listen

Rechargeable AA NiMH Batteries (2)

SKU: LA-362
A picture of a Listen soft carrying case.

Soft Case (Limited Quantities)

SKU: LA-306
Charging Case 16 RF Products

16-Unit Portable RF Product Charging/Carrying Case (Limited Quantities)

SKU: LA-311
Open portable RF carrying case

16-Unit Portable RF Product Carrying Case (Limited Quantities)

SKU: LA-313
4-Unit Portable RF Product Carrying Case (Limited Quantities)

4-Unit Portable RF Product Carrying Case (Limited Quantities)

SKU: LA-318
Protective pouch shown with an RF Receiver inside

Protective Pouch for Portable RF Products (Limited Quantities)

SKU: LA-319
Configurable Carrying Case

Configurable Carrying Case

SKU: LA-320
Open hard shell travel case with portable radio frequency receivers.

8-Unit Portable RF Product Carrying Case (Limited Quantities)

SKU: LA-322
Line/Mic Y Input Cable for LT-700 (Limited Quantities)

Line/Mic Y Input Cable for LT-700 (Limited Quantities)

SKU: LA-263

FAQs

+Does the LT-700 provide phantom power?

Yes, 3VDC

+Will the LT-700 portable transmitter work for two-way communication?

No. However, Listen does recommend ListenTALK a two-way system for tour group applications where talk-back communication modes are available.

+What is the range of the LT-700 portable transmitter?

Line of site up to 150 ft. (45.7 m) for 216 MHz.

+Can I use a line source with the portable transmitter?

Yes. Listen offers the LA-263, a mic/line input cable for this use.

+How long do the batteries last on the portable transmitter?

Alkaline batteries last 15 hours; NiMH rechargeable batteries last 8 hours (72 MHz & 216 MHz).