Lectrosonics MM400c User Manual

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Watertight Miniature UHF Belt-Pack Transmitter

Rio Rancho, NM

Thank you for selecting the Lectrosonics MM400C

watertight miniature transmitter. The unique design

provides several distinct features for professional ap-

plications:

• Outstanding RF operating range

• Superb audio quality

• Ultra-lightweight, corrosion resistant housing

• Watertight seals for use in wet environments

• Programmable emulation modes for maximum

versatility

The patented Digital Hybrid Wireless

design combines

24-bit digital audio with analog FM techniques to pro-

vide 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 wave-

length flexible cable connects to a watertight 50 Ohm

SMA port on the transmitter.
The MM400C is machined from a solid aluminum block

to provide the lightweight, rugged package needed in

extreme environments without compromising functional-

ity. Input jacks and controls are O-ring sealed for water-

tight protection in wet environments. A special noncor-

rosive finish 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 some

other brands of analog wireless receivers. Compat-

ibility Modes are easily selected with a sequence of

frequency switch settings and cycling the unit’s power.

Only the MM400C transmitter is covered in this manual.

Companion receivers are covered in separate manuals.