Lectrosonics UMCWB - Manual (Page 4)

UMCWB
LECTROSONICS, INC. 4
RF/Power Distribution Module Block Diagram
General Technical Description
The purpose of wideband architecture is to provide
the flexibility needed to deal with a changing RF envi-
ronment, and for mobile productions that cover broad
geographic areas. The UMCWB provides a mechanical
rack mount with power and RF signal distribution for
four diversity compact receivers in a single rack space.
The standard version covers frequency blocks from 21
through 29. The wideband low version covers frequency
blocks from 470 through 26.
The RF multicoupler preserves the sensitivity and
overload performance of the finest receivers. Selective
filtering in the front end attenuates RF signals above
and below the passband to suppress intermodulation
and noise. Following the filters is a low noise RF ampli-
fier with gain matched to compensate for the losses in
the splitter that follows.
A precision strip line splitter/isolator divides the RF
signal into four isolated signals preventing spurious
RF coupling between receivers. The splitter/isolator is
termination independent which prevents mismatched
or disconnected RF outputs from affecting the other
receivers.
The assembly is powered from an external source of
11 to 18 VDC with individual auto-reset fuses for each
receiver in the RF/power distribution module. This archi-
tecture eliminates ground loops and AC hum that can
occur when the receiver outputs are connected to other
audio equipment operating from a different AC source.
RF FILTERING & DISTRIBUTION
POWER SUPPLY & DISTRIBUTION
Polyfuses
RF
Amp
Splitter
&
Isolator
RF to
Receivers
12V DC
Power to
Receivers
RF
Amp
Diversity RF/Power Distribution Module
11-18 VDC
>2 Amps
A
Antenna
B
Antenna
Ceramic Filters
Main
Polyfuse
Splitter
&
Isolator