Digital IEM System
Rio Rancho, NM
5
FlexList™
Additionally, the M2R includes a FlexList™ mode,
where up to 16 mixes can be accessed by name. This
feature enables a monitor engineer to quickly find and
listen to any of the performer’s mixes on the stage.
A FlexList mix is a profile of a performer’s personal
transmitter. The mix includes the performer’s name
(or whatever name the user chooses for that unit),
frequency, mixer settings and limiter settings. The mix
is easily shared via the M2R IR port, added to the list
of 16 mixes and stored until cleared by the user. The
M2R allows the user to toggle between the mixes,
making troubleshooting issues easy and efficient.
RF Front-End with Tracking Filter
A wide tuning range is helpful in finding clear frequen-
cies for operation, however, it also allows a greater
range of interfering frequencies to enter the receiver.
The UHF frequency band, where almost all wireless
microphone systems operate, is heavily populated by
high power TV transmissions. The TV signals are im-
mensely more powerful than a wireless microphone or
IEM transmitter signal and will enter the receiver even
when they are on significantly different frequencies
than the wireless system. This powerful energy ap-
pears as noise to the receiver, and has the same effect
as the noise that occurs with extreme operating range
of the wireless system (noise bursts and dropouts). To
alleviate this interference, front-end filters are needed
in the receiver to suppress RF energy below and
above the operating frequency.
The M2R receiver employs a selective frequency track-
ing filter in the front-end section (the first circuit stage
following the antenna). As the operating frequency is
changed, the filters re-tune into six different “zones”
depending on the selected carrier frequency.
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470 MHz
614 MHz
In the front-end circuitry, a tuned filter is followed by an
amplifier and then another filter to provide the selec-
tivity needed to suppress interference, yet provide a
wide tuning range and retain the sensitivity needed for
extended operating range.
