The HM Digital Hybrid® UHF plug-on transmitter features
a DSP-based design that allows the transmitter to operate
in its native Digital Hybrid Wireless® mode, Lectrosonics
200 Series, 100 Series, IFB product groups,
plus two modes for compatibility with analog receivers
from other manufacturers. A unique multi-voltage phantom
power feature allows the transmitter to be used
with virtually any microphone, including high-current
condenser types, expanding its usefulness in high-end
applications such as motion picture production.
The transmitter provides 256 frequencies in standard
frequency blocks, selected with two rotary switches on
the side of the housing. The input amplifier uses an ultra
low noise op-amp for quiet operation. It is gain controlled
with a wide range dual envelope limiter, providing over
30 dB of headroom above full modulation. A 24-bit A-D
converter digitizes the audio, then filters supersonic
noise above 21 kHz. The resulting signal is encoded
with a proprietary algorithm to produce an analog data
signal for RF transmission. The underlying RF link is an
optimized FM system with /-75 kHz wide deviation for a
high signal to noise ratio