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Lectrosonics WM Watertight Belt-Pack Transmitter with MIC, 2AA Lithium Battery, 50/100/250 mW RF Power

SKU: LEWM

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Questions & Answers

FAQ

What makes the Lectrosonics WM Watertight Belt-Pack Transmitter suitable for wet or dusty environments?

The transmitter features O-ring sealed battery compartments and input jack, a compression-sealed antenna port, and gasket-sealed control panel and back cover, making it resistant to dust and water intrusion.

How does the selectable output power of the transmitter affect its operation?

The selectable output power of 50, 100, and 250 mW allows you to balance between extended operating range and battery life. Higher power output improves operating range but reduces battery life, and vice versa.

What is the function of the DSP-controlled analog audio limiter in the transmitter?

The DSP-controlled analog audio limiter provides a range of more than 30 dB for excellent overload protection. It is acoustically transparent, maintaining low distortion while preserving short-term dynamic changes.

Is the Lectrosonics WM Watertight Belt-Pack Transmitter compatible with other brands of receivers?

Yes, the transmitter is backward compatible with Lectrosonics 200 and 100 Series and IFB receivers, and also compatible with some other brands of analog wireless receivers.

What is the purpose of the RF isolator in the transmitter's output circuit?

The RF isolator allows RF signals to pass through to the antenna, but blocks them from coming backward into the transmitter output section. This reduces RF inter-modulation when multiple units are used in close proximity and protects the output stage from electrostatic shock.

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Lectrosonics WM Specifications

  • Operating frequencies

    Block 470: 470.100 - 495.600
    Block 19: 486.400 - 511.900
    Block 20: 512.000 - 537.500
    Block 21: 537.600 - 563.100
    Block 22: 563.200 - 588.700
    Block 23: 588.800 - 607.900 and 614.100 - 614.300
    Block 24: 614.400 - 639.900
    Block 25: 640.000 - 665.500
    Block 26: 665.600 - 691.100

  • Channel Spacing

    100 kHz

  • Frequency selection

    Control panel mounted membrane switches

  • RF Power output

    Switchable; 50, 100 or 250 mW

  • Compatibility Modes (6)

    Digital Hybrid Wireless (400 Series), 200 Series, 100 Series, Mode 3, Mode 6, IFB

  • Pilot tone

    25 to 32 kHz; 5 kHz deviation (in 400 Series Hybrid Mode)

  • Frequency stability

    +/- 0.002%

  • Deviation

    +/- 75 kHz max. (in 400 Series Mode)

  • Spurious radiation

    60dB below carrier

  • Equivalent input noise

    -125 dBV, A-weighted

  • Input level: Dynamic mic

    0.5 mV to 50 mV before limiting.
    Greater than 1 V with limiting.

  • Input level: Electret lavaliere mic

    1.7 uA to 170 uA before limiting.
    Greater than 5000 uA (5 mA) with limiting

  • Input level: Line level input

    17 mV to 1.7 V before limiting.
    Greater than 5 V with limiting.

  • Input impedance: Dynamic mic

    300 Ohms

  • Input impedance: Electret lavaliere

    Input is virtual ground with servo adjusted constant current bias

  • Input impedance: Line level

    > 2.7 kOhms

  • Input limiter

    Soft limiter, 30 dB range

  • Bias voltages

    Selectable; 2V, 4V and Of

  • Gain control range

    44 dB; panel mounted membrane switches

  • Modulation indicators

    Dual bicolor LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation

  • Controls

    Control panel with LCD and four membrane switches

  • Low frequency roll-of

    Adjustable from 35 to 150 Hz

  • Audio Frequency Response

    35 Hz to 20 kHz, +/-1 dB

  • Total Harmonic Distortion

    0.2% typical (400 Series mode)

  • Audio Input Jack

    2.5 mm locking micro; threaded for stainless sleeve on WP connector

  • Antenna

    Flexible, unbreakable steel cable

  • Battery Type

    1.5 Volt AA lithium

  • Battery Life

    50 mW (2 AA): 14.5 hrs
    100 mW (2 AA): 14 hrs
    250 mW (2 AA): 7.5 hrs

  • Dimensions

    Housing: 2.98 x 2.55 x 0.77" / 75.69 x 64.77 x 19.55mm (including battery caps)

  • Weight

    5.33oz / 151.10g (with lithium batteries)

About Lectrosonics WM

Experience the superior performance of the Lectrosonics WM Watertight Belt-Pack Transmitter with MIC, specifically engineered for challenging environments. This robust transmitter is ideal for use in wet or dusty conditions, thanks to its O-ring sealed battery compartments and input jack, compression-sealed antenna port, and gasket-sealed control panel and back cover.

Powered by dual AA batteries, this transmitter offers double the operating time of previous watertight models. It features larger membrane switches and a control panel, along with a backlit LCD for enhanced user interaction. The transmitter provides selectable output power of 50, 100, and 250 mW, allowing you to balance between extended operating range and battery life based on your specific needs.

The WM transmitter is equipped with a DSP-based design that is compatible with all Digital Hybrid receivers, and is backward compatible with Lectrosonics 200 and 100 Series and IFB receivers, as well as some other brands of analog wireless receivers. The input section boasts servo bias circuitry, with selectable voltages from the LCD to cater to a wide variety of lavaliere microphones.

This transmitter also features a DSP-controlled analog audio limiter, offering a range of more than 30 dB for superior overload protection. The limiter is acoustically transparent, maintaining low distortion while preserving short-term dynamic changes.

The WM transmitter's watertight connections ensure the microphone connector's O-ring is securely seated, and the antenna is mounted with a compressible strain relief for a watertight connection. The DSP-generated pilot tone eliminates the need for fragile crystals and reduces squelch problems in multichannel systems.

The transmitter's RF output circuit includes a specialized RF isolator that allows RF signals to pass through to the antenna, but blocks them from coming backward into the transmitter output section. This feature reduces RF inter-modulation when multiple units are used in close proximity and protects the output stage from electrostatic shock.

With its machined aluminum, corrosion-resistant housing, water-resistant seals, and LCD interface with lockout option, the Lectrosonics WM Watertight Belt-Pack Transmitter with MIC is a reliable choice for demanding environments. Its programmable compatibility modes and servo bias input circuitry with selectable voltage make it versatile for use with a wide range of different receivers.

Lectrosonics WM Features

  • Rugged watertight design ideal for dusty or wet environments with O-ring sealed compartments
  • Extended battery life with dual AA lithium batteries & selectable RF power output (50/100/250 mW)
  • Enhanced user interface featuring backlit LCD and larger membrane switches
  • DSP-based compatibility with Digital Hybrid, 200 Series, 100 Series, IFB & select analog receivers
  • Advanced servo bias input circuitry with selectable voltages for diverse microphone compatibility
  • Built-in DSP-controlled analog audio limiter for transparent overload protection & low distortion

Warranty Information

This product has a limited warranty of 12 months.

Product Documents

User Manual

Key Features

  • Rugged watertight design ideal for dusty or wet environments with O-ring sealed compartments
  • Extended battery life with dual AA lithium batteries & selectable RF power output (50/100/250 mW)
  • Enhanced user interface featuring backlit LCD and larger membrane switches
  • DSP-based compatibility with Digital Hybrid, 200 Series, 100 Series, IFB & select analog receivers
  • Advanced servo bias input circuitry with selectable voltages for diverse microphone compatibility
  • Built-in DSP-controlled analog audio limiter for transparent overload protection & low distortion

What's in the box:

  • Lectrosonics WM Watertight Belt-Pack Transmitter
  • 2x 1.5V Dual Lithium AA Batteries
  • Microphone
  • Belt Clip
  • O-Ring Kit
  • Quickstart Guide
  • Lectrosonics 1 Year Limited Warranty