Lectrosonics WM Watertight Transmitter

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*** The Lectrosonics WM Watertight Transmitter includes the M152WP lavalier. ***

Designed for wet or dusty environments, the Lectrosonics WM transmitter features O-ring sealed battery compartments and input jack, a compression sealed antenna port and gasket sealed control panel and back cover. Dual AA batteries provide twice the operating time of earlier watertight transmitter designs. Larger membrane switches and control panel and a highly visible, backlit LCD enhance the user interface.

To meet the demand for both extended operating range and extended battery life, the transmitter offers selectable output power of 50, 100 and 250 mW. With higher power output, the operating range is improved at the expense of battery life. When range is not an issue, the power can be reduced to extend the battery life.

The transmitter can be controlled by the RM and RM2 remote control units for hands free setup and adjustment using audible tones delivered into the microphone from a tiny loudspeaker in the remote control unit. The transmitter can be put to sleep to conserve battery power during setup when it is buried deep inside costuming, then awakened for normal operation when the production begins. Other adjustments include frequency, audio level and control panel lockout.

The DSP-based design works with all Digital Hybrid receivers, and is backward compatible for use with Lectrosonics 200 and 100 Series and IFB receivers and some other brands of analog wireless receivers.

The input section features servo bias circuitry with voltages being selectable from the LCD to match the requirements of a wide variety of lavaliere microphones. The bias can also be turned off for use with dynamic microphones. A line level setting is provided for use with signal levels up to 5 volts. The low frequency roll-off can be adjusted from 35 to 150 Hz.

A DSP-controlled analog audio limiter is employed ahead of the ἀrst mic preamp to protect the entire audio chain from overload. The limiter has a range of more than 30 dB for excellent overload protection and a dual release envelope that makes the limiter acoustically transparent while maintaining low distortion.

Lectrosonics WM Features:

• Selectable output power to maximize battery life or operating range
• Machined aluminum, corrosion resistant housing
• Water resistant seals for use in wet environments
• LCD interface with lockout option
• Programmable compatibility modes for use with a wide variety of different receivers
• Servo Bias input circuitry with selectable voltage

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 or call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC).

• Channel Spacing: 100 kHz
• Frequency Selection: Control panel mounted membrane switches
• RF Power Output: Switchable at 50 or 100 mW
• Pilot Tone: 25 to 32 kHz frequency; 5 kHz deviation (in 400 Series Hybrid Mode)
• Frequency Stability: ±0.002%
• Deviation: ±75 kHz max. (in 400 Series Mode)
• Spurious Rejection: 60 dB below carrier
• Equivalent Input Noise: -125 dBV, A-weighted
• Input Level:
  • Dynamic Mic: 0.5 mV to 50 mV before limiting; > than 1 V with limiting
  • Electret Lavalier: 1.7 uA to 170 uA before limiting; > 5000 uA (5 mA) with limiting
  • Line Level: 17 mV to 1.7 V before limiting; > 5 V with limiting
• Input Impedance:
  • Dynamic Mic: 300 Ohms
  • Electret Lavalier: Input is virtual ground with servo adjusted constant current bias
  • Line Level: > 2.7 k Ohms
• Input Limiter: Soft limiter, 30 dB range
• Bias Voltages: Selectable; 2V, 4V and Off
• Gain Control Range: 44 dB; panel mounted membrane switches
• Modulation Indicators: Dual bicolor LEDs indicate modulation of -20, -10, 0 and +10 dB referenced to full modulation
• Controls: Control panel with LCD and four membrane switches
• Audio Frequency Response: 35 Hz to 20 kHz, ±1 dB (the low frequency roll-off is adjustable)
• 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
• Batteries: 1.5 Volt AA lithium or rechargeable NiMH recommended
• Battery Life, (2) AA:
  • WM 250mW: 1.75 hours (alkaline); 7.5 hours (lithium), 5 hours with 2500mAh NiMH
  • WM 100mW: 5.5 hours (alkaline); 14 hours (lithium), 8.5 hours with 2500mAh NiMH
  • WM 50mW: 6 hours (alkaline); 14.5 hours (lithium), 8.5 hours with 2500mAh NiMH
• Dimensions (H x W x D): 2.98 x 2.55 x .77 in | 75.7 x 64.8 19.6 mm (including battery caps)
• Weight: 5.33 oz | 151 g, with lithium batteries