Lectrosonics LMb Digital Hybrid Wireless Beltpack Transmitter (B1: 537.600 to 614.375 MHz)

Lectrosonics LMb Digital Hybrid Wireless Beltpack Transmitter (B1: 537.600 to 614.375 MHz)

Lectrosonics LMb Digital Hybrid Wireless Beltpack Transmitter (B1: 537.600 to 614.375 MHz)

B&H # LELMBB1 MFR # LMB-B1
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Product Highlights

  • For Broadcast, EFP and ENG Applications
  • 75 MHz Tuning Range
  • Digital Hybrid Wireless
  • 50 mW RF Power
  • Mic and Line Inputs
  • Fixed Antenna
  • LCD Backlit Screen
  • Multi-Function Switch for Mute/Talkback
  • Rugged Machined-Aluminum
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  • 1Description

The LMb from Lectrosonics is a digital hybrid wireless beltpack transmitter with 75 MHz tuning bandwidth and 50 mW RF power. When paired with a mic and receiver, it can be used to capture audio for applications such as broadcast TV, theater, houses of worship, live stage, and more.

The LMb has several other features to help you obtain good clear audio, such as 25 or 100 kHz tuning steps, a compatibility mode to ensure analog receivers will work well with the transmitter, a microphone input allowing you to use mic or line level inputs. When combined with the optional MI39-type instrument interface cable (sold separately), the LMb transmitter can be used as a musical instrument transmitter for guitar, bass or portable keyboard.

In addition, the durable LMb transmitter is enclosed in machined-aluminum housing and is built with a fixed antenna. A multi-function toggle switch allows audio muting, power on/off, or talkback (when used with the SRb or Venue receivers). A LCD and membrane switch interface make the LMb transmitter easy to setup and simple to use. This transmitter operates on the B1 channel between 537.600 to 614.375 MHz.

In the Box
Lectrosonics LMb Digital Hybrid Wireless Beltpack Transmitter (B1: 537.600 to 614.375 MHz)
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description
    Channel B1
    Frequency Range 537.600 to 614.375 MHz
    Frequency Selection Steps: Selectable 25 or 100 kHz
    RF Power Output 50 mW
    Pilot Tone 25 to 32 kHz, 5 kHz deviation (Digital Hybrid mode)
    Frequency Stability ± 0.002%
    Deviation ± 75 kHz max. (Digital Hybrid mode)
    Spurious Radiation 60 dB below carrier
    Equivalent Input Noise -120 dBV (A-weighted)
    Input Level Nominal 2 mV to 300 mV, before limiting
    Greater than 1 V maximum, with limiting
    Input Impedance 2 kOhms
    Input Limiter DSP controlled, dual envelope "soft" limiter with greater than 30 dB range
    Gain Control Range 44 dB, digital control
    Modulation Indicators Dual bicolor LEDs indicate modulation of -20, -10, 0 and +10 dB referenced to full modulation
    LCD bar graph
    Audio Performance
    Frequency Response 90 Hz to 20 kHz (+/-1 dB)
    Low Frequency Roll-Off -12 dB/octave, 70 Hz
    THD 0.2% (typical)
    SNR at Receiver Output SmartNR: Off 103.5 (no limiting) 108.0 (with limiting)
    Normal: 107.0 (no limiting) 111.5 (with limiting)
    Full: 108.5 (no limiting) 113.0 (with limiting)

    Note: The dual envelope "soft" limiter provides good handling of transients using variable attack and release time constants. Once activated, the limiter compresses 30+ dB of transmitter input range into 4.5 dB of receiver output range, thus reducing the measured figure for SNR without limiting by 4.5 dB
    Switch Controls Top panel slide switch; programmable as power, mute, talkback or no (off) function
    Side panel membrane switches with LCD interface for power on/off and all setup and configuration controls
    Audio Input Jack 1x Switchcraft 5-pin locking (TA5F)
    Antenna Galvanized steel, flexible wire
    Battery 2x AA alkaline, lithium, NiMh rechargeable
    Battery Life Alkaline: 4.5 hours
    Duracell Quantum: 7 hours
    Eneloop 2400 mAH NiMH: 8 hours
    Dimensions (L x W x H) 3.2 x 2.4 x .8" (81 x 61 x 20 mm)
    Weight 5 oz (141 g), including lithium AA batteries and wire belt clip
    Packaging Info
    Package Weight 0.95 lb
    Box Dimensions (LxWxH) 13.4 x 5.3 x 3.5"

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