Lectrosonics MM400b - Manual (Page 3)

Watertight Miniature UHF Belt-Pack Transmitter
Thank you for selecting the Lectrosonics MM400B
watertight miniature transmitter. The unique design
provides several distinct features for professional
applications:
• 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 Digital Hybrid Wireless ™ design (US Patent Pend­
ing) 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 wave­
length 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 functional­
ity. 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 fre­
quency switch settings and cycling the unit’s power.
Only the MM400B transmitter is covered in this manual.
Companion receivers are covered in separate manuals.
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