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Man smiling wearing an Intelligent DSP RF Receiver with a neckloop and earbud
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Side view of an intelligent DSP RF Receiver

Intelligent DSP RF Receiver (72 MHz)

Item:LR-4200-072

The LR-4200-072 receiver from Listen Technologies offers outstanding audio clarity and quality with the best range and reception in its class.

Part of our Intelligent Digital Signal Processing (iDSP) line, the LR-4200-072 is the smallest device of its kind, resulting in a compact unit that won’t burden the end user. An integrated neck loop/lanyard makes each receiver easy to wear, and the DSP loop driver offers an improved listening experience for anyone with a T-coil-equipped hearing aid. Dual 3.5mm output jacks also allow receivers to be shared between users.

Each receiver is equipped with a micro USB connection which can be used with free iDSP software for charging, set up, programming, inventory management and firmware updates.

Extended speaking sessions, presentations and more can be challenging for other devices, but the LR-4200-072 incorporates advanced Lithium-ion rechargeable batteries that offer long life and reliable power. Charge status, along with channel information and volume level, are easy to read on the integrated OLED display.

From classrooms to boardrooms, conferences and more, the LR-4200-072 is an outstanding receiver choice for any venue looking to offer convenient, reliable assistive listening.

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Includes

One (1) LR-4200-072 Intelligent DSP RF Receiver (72 MHz)*

*The LR-4200-072 comes with a quick start guide and a non-proprietary field replaceable Lithium-ion battery.

Highlights

  • High-performance RF receiver offering best-in-class sensitivity and 20dB less noise than other devices
  • Integrated neck loop/lanyard with DSP loop driver for an enhanced T-coil listening experience
  • Smallest device of its kind makes it easier to wear and use and for venues to dispense, store and maintain
  • OLED display showing channels, battery status, channel status, volume level, and more
  • Lanyard and belt clip options offer convenient and discreet choices for the end user
  • Advanced rechargeable battery technology eliminates the costs and hassles associated with frequent battery replacement
  • Designed for single-channel applications

Also Needed

Universal Ear Speaker with over the ear loop, cable, and 3.5mm standard audio jack plug

Universal Ear Speaker

SKU: LA-401
Dual headphones with 3.5 mm extension cable

Universal Stereo Headphones

SKU: LA-402
Universal behind-the-head stereo headphones

Universal Behind-the-Head Stereo Headphones

SKU: LA-403
Universal single ear bud with extension cord

Universal Single Ear Bud

SKU: LA-404
Aux cord shown with earbuds

Universal Stereo Ear Buds

SKU: LA-405
ListenTALK 12-unit charging tray

Intelligent 12-Unit Charging Tray

SKU: LA-381
ListenTALK 12-unit charging/carrying case

Intelligent 12-Unit Charging/Carrying Case

SKU: LA-380
Intelligent earphone/ neckloop lanyard with dual 3.5 mm audio inputs

Intelligent Ear Phone/Neck Loop Lanyard

SKU: LA-430
Back view of 4 port USB Charger

4-Port USB Charger

SKU: LA-423
USB to Micro USB Cable

USB to Micro USB Cable

SKU: LA-422
One port USB charger

1-Port USB Charger

SKU: LA-421
Radio Frequency (72 MHz) Transmitter

Stationary RF Transmitter (72 MHz)

SKU: LT-800-072-01
Portable Programable Display RF Transmitter (72 MHz)

Portable Display RF Transmitter (72 MHz) (Limited Quantities)

SKU: LT-700-072

Specs

+Audio

System Distortion< 2% total harmonic distortion (THD) at 80% deviation
Output/sTwo (2) 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohm
System Frequency Response50 Hz - 15 kHz (±3 dB)
System Signal to Noise RatioSQ enabled 80 dB, SQ disabled 60 dB

+Controls

User ControlsPower, up/down volume
ProgrammingVia software and USB port
Set-up ControlsPress and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel

+Indicators

LEDsFlashes when batteries are low or to indicate charging, solid when fully charged
DisplayChannel designation, battery level, unit number, charging status

+RF

Frequency Range72.0250 - 75.9500 MHz
Number of Channels17 wide band, 40 narrow band
Sensitivity.6uV typical, 1 uV maximum for 12 dB sinad
Frequency Accuracy± .005% stability 32 to 122 ºF (0 to 50 ºC)
SquelchProgrammable in 20 steps, automatic on loss of RF signal
Antenna TypeUses ear phone/neck loop lanyard and short ear phone cable or standard earphone cable

+Power

Power SupplyMicro USB connector, 5 V, 500 mA
Battery TypeLithium Ion 3.7 Vdc, 1200 mAh
Battery Life8 Hours of continuous use
Battery Charging TimeFully charged in 2.5 Hours

+Physical

ColorBlack
Unit Weight with Batteries2.40 oz. (68 g)
Shipping Weight3.20 oz. (91 g) with 1.0 lbs. (454 g) minimum
Dimensions (H x W x D)3.75 x 2.00 x 0.64 in. (9.6 x 5 x 1.7 cm)
Unit Weight1.60 oz. (45 g)
Dimensions with Belt Clip3.75 x 2.00 x 0.80 in. (9.6 x 5.0 x 2.1 cm)

+Environmental

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

+Compliance

StandardsFCC Part 15, Part 90, Industry Canada, RoHS

FAQs

+What is the difference between the LR-4200 and the LR-5200?

The main difference is that the LR-5200 is programmable with a multi-function Listen button. It gives the user an opportunity to program only the desired channels and lockout the unused channels. This makes it simple to operate for end users that need to select between multiple active channels. The Listen Button can also be used to search for an active channel and lock the receiver on a specific channel.

+What is the purpose of Squelch?

The purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch function can be programmed to the desired setting.

+What is the function of SQ?

To reduce noise of the systems, Listen offers a noise reduction technology called ListenSQ™. Both the transmitter and receiver must have SQ on to achieve the desired results. If you are planning to use this product with older Listen systems or equipment not manufactured by Listen, you should disable SQ.

+What type of battery technology does the LR-4200 use?

The LR-4200 uses a non-proprietary field replaceable Lithium Ion battery.

+How long does it take to fully charge the LR-4200?

It varies dependent on the depletion of the battery. A fully depleted battery will charge in 2.5 hours or less.

+How many LR-4200 receivers can I use in a system?

As many as you need, the number is endless.

+How long will the LR-4200 run on a fully charged battery?

The LR-4200 will run continuously for 8 hours on a fully charged battery