The WM Watertight Belt-Pack Transmitter with Lavalier Mic from Lectrosonics is designed for wet or dusty environments. It features an O-ring sealed battery compartment and input jack, a compression sealed antenna port, and a gasket sealed control panel and back cover. It can be used when paired with a wireless receiver for capturing audio in broadcast TV, ENG (Electronic Field Productions), and EFP (Electronic Field Production) applications, and more.

Dual AA batteries provide twice the operating time of earlier watertight transmitter designs and the larger membrane switches and control panel have a highly visible backlit LCD, which enhances the user interface. In addition, there are 50, 100, or 200 mW selectable-output power switches to maximize battery life and operating range.

Some other features include servo bias input circuitry with selectable voltage for compatibility with other microphones, and programmable compatibility mode for use with a wide variety of different receivers. The transmitter is enclosed in a machined-aluminum corrosion resistant housing and includes a Lectrosonics M152/WP omnidirectional lavalier mic, a belt clip, an O-Ring kit, and two AA lithium batteries.

For Broadcast, EFP and ENG Applications    Water-Resistant Seals    Selectable 50, 100 & 250 mW Output Power    LCD Interface with Lockout Option    Servo Bias Input Circuitry    Machined-Aluminum Housing    O-Ring Sealed Battery Compartment    Includes M152/WP Lavalier Mic    2 x AA Batteries Included    Belt Clip

The voltage and current requirements of the wide variety of electret microphones used in professional applications has caused confusion and compromises in the wiring needed for wireless transmitters. To address this problem, the Servo Bias input circuit provides an automatically regulated voltage over a very wide range of current for compatibility with all microphones

All wireless links suffer from channel noise to some degree, and all wireless microphone systems seek to minimize the impact of that noise on the desired signal. Conventional analog systems use companders for enhanced dynamic range, at the cost of subtle artifacts (typically “pumping” and “breathing”). Digital systems defeat the noise by sending the audio information in digital form, at the cost of some combination of power, bandwidth and resistance to interference

Digital Hybrid systems overcome channel noise by 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 but a technique that can be accomplished only in the digital domain, even though the inputs and outputs are analog

The Digital Hybrid design results in a signal-to-noise ratio high enough to preclude the need for conventional pre-emphasis (HF boost) in the transmitter and de-emphasis (HF roll off) in the receiver. This eliminates the potential for distortion of signals with abundant high-frequency information

The low frequency roll-off can be set for a 3 dB down point at 35, 50, 70, 100, 120 and 150 Hz to control subsonic and very low frequency audio content in the audio. The actual roll-off frequency will vary slightly depending upon the low frequency response of the microphone.
Excessive low frequency content can drive the transmitter into limiting, or in the case of high output sound systems, it can even cause damage to loudspeaker systems. The roll-off is normally adjusted by ear while listening as the system is operating

A DSP-controlled analog audio limiter is employed before the A-D converter. The limiter has a range of more than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion. It can be thought of as two limiters in series, a fast attack and release limiter followed by a slow attack and release limiter. The limiter recovers quickly from brief transients, with no audible side effects, and also recovers slowly from sustained high levels to keep audio distortion low while preserving short term dynamics

Related Questions and Answers

Q: 1. Is this ok to use for bag work? Would the proximity of this transmitter interfere with the receivers, I'm also carrying in my audio bag? Would the LMa model be a better solution?

A: I don't think you have anything to worry about. The systems you are using are about as good as it gets. They are all frequency agile and the system overcomes channel noise by digital encoding and decoding audio in the transmitter and receiver. That being said no wireless can be 100% fool proof. But what you are using is about as close as it gets. Even in the worst case scenario if you had an issue. You can always take a receiver out of your bag and put it in your back pocket. I think you should be fine and the LMa is unnecessary.

Q: 2. Is it posible to use this Lectrosonic transmitter with a Sennheiser receiver in the same band (A1)?

A: No that would not be possible.

Q: 3. Will two of these work with the URX-P03D Dual-Channel Camera-Mount Wireless Receiver?

A: Yes it will.

Q: 4. Is this transmitter compatible with the receiver that comes with the Sony PXW-X400 camera? DE-15/DB-15 (Wireless Receiver)

A: The Sony UTX-B40 Wireless Bodypack Transmitter with Omni Lavalier Mic is only compatible with UWP series receivers operating on the same frequency range.

Q: 5. What recivers are available to use with this transmitter?

A: The list of receivers compatible with the Lectrosonics HMa Plug-On Wireless Transmitter depends on the frequency range selected. For an HMa on the A1 (470-537MHz) or B1 (537-607MHz) ranges, there are many options including the Lectrosonics SRc, LR, UCR411A. If using the HMa on the 941 (941-951MHz), the options are limited to the SRc receiver.

Q: 6. Will the UTX-B40 work with the URX-P03 receiver. I need to replace a broken UTX-B03?

A: Yes, as long as both components operate on the same frequency band, they will work together. For example, this specific transmitter operates on the UC14: 470 to 542 MHz band, so the receiver would need to operate on the same band.

Q: 7. Which ones can be used in the U.S.

A: All of the Lectrosonics HMa Plug-On Wireless Transmitters that we sell can be used in the United States.

Q: 8. what is the smqv connector? is TA3M? or TA5M?

A: The connector is a TA5.

Q: 9. Is there a IR sync as well on the UTX-B40 to let it auto sync with the URX-03D?

A: Yes, the Sony UTX-B40 wireless bodypack transmitter does have IR sync capability for use with the URX-P03D, URX-P03, and URX-S03D receivers

Q: 10. can you recharge the batteries (Ni-MH) via the USB port? Like you can with other Sony wireless gear.

A: Hi, yes the USB-C port on the transmitter will charge re-chargeable batteries. Thank you for shopping at B&H!