The Digital Hybrid Wireless™ design (US Patent Pending) combines 24-bit digital audio with analog FM techniques to provide the operating range of the finest analog wireless systems and the audio quality of a pure digital system. The 100 mW RF output power extends operating range, and the DSP controlled, dual-envelope limiter cleanly handles input peaks to allow higher gain settings. This combination maximizes operating range and the signal to noise ratio of the system.
The input provides 6 VDC bias voltage for use with modern electret lavaliere microphones. Multi-color LEDs are provided to make input gain adjustments quick and accurate, without having to view the receiver. The battery compartment accepts AA alkaline, lithium or NiMH batteries, and a detachable antenna ¼ wavelength flexible cable connects to a watertight 50 Ohm SMA port on the transmitter.
The MM400B is machined from a solid aluminum block to provide the lightweight, rugged package needed in extreme environments without compromising functionality. Input jacks and controls are O-ring sealed for watertight protection in wet environments. A special noncorrosive finish (same as is used on NASA space vehicles) resists salt water exposure and perspiration in extreme environments.
The DSP-based design offers backward compatibility with a handful of earlier analog designs, such as the Lectrosonics 100 and 200 Series receivers, and other brands of analog wireless receivers. Compatibility Modes are easily selected with a sequence of frequency switch settings and cycling the unit’s power. Only the MM400B transmitter is covered in this manual. Companion receivers are covered in separate manuals.
