Multiple Systems Operation; Overview; Multiple System Interference; Setup Complexity - SABINE SW71-NDR User Manual

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Table Of Contents

Table of Contents

11. MUL TIPLE SYSTEMS OPERATION

11.1. Overview

In many circumstances a single wireless microphone system is all that will be

in use at any one time. Larger applications (church, concert hall, theater

stage, conference room, etc), however, can often require a large array of wire-

less microphones, all demanding flawless uninterrupted simultaneous op-

eration.

Multiple system operation presents at least two important operational chal-

lenges: interference among transmission channels, and setup complexity.

The Sabine SWM7000 provides powerful solutions to both, particularly the

interference problems associated with two or more RF channels at work at the

same time, at the same location.

11.1.1. Multiple System Interference

Sabine's SWM7000 addresses multiple system interference with two strat-

egies. First, greater available bandwidth in the 2.4-2.4835 GHz range means

more channels can occupy the band, i.e., the expanded range can be divided

into a greater number of separate transmission/reception bands. Second,

with Smart Spectrum transmission and reception, channels are more toler-

ant of interference. The net result is that the SWM7000 offers the potential for

many more simultaneous transmission channels than conventional UHF or

VHF systems.

While such performance benefits are one of the major advantages of the

SWM7000, more systems working at the same time leads to a greater po-

tential for complexity. Fortunately, the SWM7000 also offers tools to simplify

setup and operation.

11.1.2. Setup Complexity

Multiple wireless systems in a large installation are of course more compli-

cated than a single transmitter/receiver. More space is needed, and the

sheer quantity of transmitters and receivers that may be in use at a single

installation can prove difficult to manage. The SWM7000 series helps man-

age such potential complexity with four strategies and/or system accesso-

ries:

First, the SW72 and SW72-NDR receivers offer a 50% space-saving

advantage with 2-channel receivers that occupy the same 1U space as

single channel receivers. Each channel in a 2-channel system shares

the true diversity operation of the two antennas connected to the single

receiver chassis.

Second, the optional SWA6SS (six-system antenna distribution ampli-

fier) greatly reduces the complexities of multiple receiver antenna de-

ployment. Since each receiver has two (diversity) antennas, which can

be mounted on either the rear or front panel, multiple receivers at one

location can potentially create a forest of antennas protruding from the

front or back of a rack. The SWA6SS Antenna Distributor reduces the

number of antennas to as few as 1/6 what would otherwise be needed.

An added important advantage of using the SWA6SS is its distributed

signal boost provided to all the antenna outputs, delivered while main-

taining diversity in all attached reception channels.

Third, large installations often entail long distances from transmitters

to receivers, or the presence of obstacles (walls, for example) in the

transmission path that can interfere with clear reception. While the

SWM7000 series is designed to minimize these kinds of problems

without accessories, the SWASS-EXT-2 (set of two extension antennas,

shown in figure 12b on page 36) may prove helpful or even necessary

in some situations. In addition to providing remote and/or desirable

low profile positioning with improved reception, the SWASS-EXT-2 also

adds another 18 dB of antenna gain for even more reliable system

performance. The Extension Antenna and Distribution Amplifier com-

ponents are also designed to operate in tandem, with the Extension

Antenna plugged directly into the amp, which can then feed (via cable)