Digital Hybrid Wireless UHF Belt-Pack Transmitter

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The Lectrosonics LMb is a Digital Hybrid Wireless® UHF transmitter that can be configured to operate as a “one touch” device with a single power on/off switch on the top panel, or with full access to all operational parameters using the side panel membrane switches and LCD interface. The top panel switch can also be configured to provide a mute or talkback function.

This versatility puts the transmitter at home in a variety of applications from video production, theater, stage and house of worship.

Frequencies are selectable in 100 kHz or 25 kHz steps across a maximum tuning range of 76.7 MHz. This yields a total of 3,072 available frequencies across three standard frequency blocks. The tuning range varies in other blocks to meet applicable frequency allocations.

The servo bias input accepts mic or line level signals with a wide range of gain adjustment in 1 dB steps. Accurate LED indications on the top panel and a bar graph indicator on the LCD allow precise gain adjustments to be made for the maximum signal-to-noise ratio and minimum distortion. The limiter in the preamp can cleanly handle signal peaks over 30 dB above full modulation, allowing the input gain to be set high enough to achieve the maximum signal-to-noise ratio.

Compatibility with earlier analog Lectrosonics receivers, Lectrosonics IFB receivers and some receivers from other manufacturers is provided by DSP emulation modes selected in the LCD menu.

The housing is an aluminum extrusion with machined aluminum top and control panels, finished with an ultra hard, black electroless nickel finish called ebENi. Spring contacts inside the compartment and nickel-plated contacts on the door keep the batteries from rattling and provide reliable electrical contacts. The unit is protected from reverse battery polarity electrically, and by the insulated contact plate in the battery door.

The membrane switch panel and LCD enable access to all adjustments and settings. The menu structure is easy to navigate. Battery status is indicated by a bi-color LED that is green with a fresh one, turns to red as it runs down, and then starts blinking red when there is 30 minutes of runtime left.

The Main Window displays the current settings - including frequency, battery status, RF output status, and audio level (modulation).

Digital Hybrid Wireless® Design
Digital Hybrid Wireless is a patented design that combines 24-bit digital audio with an analog FM radio link to provide outstanding audio quality and the extended operating range of analog wireless systems.
The design overcomes channel noise in a dramatically different way, digitally encoding the audio in the transmitter and decoding it in the receiver, yet still sending the encoded information via an analog FM wireless link.
This proprietary algorithm is not a digital implementation of an analog compander. Instead, it is a technique which can be accomplished only in the digital domain, even though the audio inputs and outputs are analog signals.

Lectrosonics LMb Transmitter Features:

  • Covers three standard frequency blocks
  • Digital Hybrid Wireless for compander-free audio
  • 50 mW RF power
  • Compatibility modes for use with analog receivers
  • 25 or 100 kHz tuning steps for up to 3072 selectable frequencies
  • Integrated multi-function switch for mute or talkback modes
  • Wide range input gain control in 1 dB steps

Lectrosonics LMb Transmitter Specifications:

  • Operating Frequencies:
    • Block A1: 470.100 - 537.575 (compatible with Blocks 470-20)
    • Block B1: 537.600 - 614.375 (compatible with Blocks 21-23)
    • Block C1: 614.400 - 691.175 (compatible with Blocks 24-26)
    • Block D1: 691.200 - 767.975 (export only; compatible with blocks 27-29)
  • Frequency Selection Steps: Selectable; 100 kHz or 25kHz
  • 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 1V maximum, with limiting.
  • Input impedance: 2k Ohm
  • Input limiter: DSP controlled, dual envelope “soft” limiter with greaterthan 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 (Digital Hybrid mode)
  • Frequency Response: 90 Hz to 20 kHz (+/-1dB)
  • Low frequency roll-off: –12 dB/octave; 70 Hz
  • THD: 0.2% (typical)
  • SNR at receiver output:
    Note: The dual envelope “soft” limiter provides exceptionally 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 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)
  • 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: Switchcraft 5-pin locking (TA5F)
  • Antenna: Galvanized steel, flexible wire
  • Battery: Two AA; alkaline, lithium, NiMH rechargeable
  • Battery Life:
    • Alkaline: 4.5 hours
    • Duracell Quantum: 7 hours
    • Eneloop 2400 mAH NiMH: 8 hours
  • Weight: 5 ounces (141 grams), including lithium AA batteries and wire beltclip
  • Dimensions: 3.2 x 2.4 x .8 in. (81 x 61 x 20 mm)
  • Emission Designator: 180KF3E

Consumer Alert

This particular wireless microphone device operates in portions of the 617-652 MHz or 663-698 MHz frequencies. Beginning in 2017, these frequencies are being transitioned by the Federal Communications Commission (FCC) to the 600 MHz service to meet increasing demand for wireless broadband services. Users of this device must cease operating on these frequencies no later than July 13, 2020. In addition, users of this device may be required to cease operations earlier than that date if their operations could cause harmful interference to a 600 MHz service licensee’s wireless operations on these frequencies. For more information, visit the FCC’s wireless microphone website at www.fcc.gov/wireless-microphones-guide or call the FCC at 1- 888-CALL-FCC (TTY: 1-888-TELL-FCC).

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