Lectrosonics UMCWB User Manual download pdf (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

Amp

Splitter

Isolator

RF to

Receivers

12V DC

Power to

Receivers

Amp

Diversity RF/Power Distribution Module

11-18 VDC

>2 Amps

Antenna

Ceramic Filters

Main

Polyfuse

Splitter

Isolator

1 2 3 4 5 6 7 8 9 10 11 12

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