Multiple Systems Operation; Overview; Multiple System Interference; Setup Complexity - SABINE SWM7000 Operating Manual

915 mhz systems 2.4 ghz systems

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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 wireless mi-

crophones, all demanding flawless uninterrupted simultaneous operation.

Multiple system operation presents at least two important operational challenges:

interference among transmission channels, and setup complexity. Sabine Smart

Spectrum 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 Wireless addresses multiple system interference with two strategies.

First, greater available bandwidth in the 2.4 GHz and 915 MHz ranges 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 tolerant

of interference. The net result is that Sabine Wirelss 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

SWM, more systems working at the same time leads to a greater potential for

complexity. Fortunately, the SWM6000 and 7000 also offer 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 SWM series helps manage such potential

complexity with four strategies and/or system accessories:

First, the dual channel receivers (SW72 and SW62) 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 amplifier)

greatly reduces the complexities of multiple receiver antenna deployment.

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 maintaining 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

SWM Series series are designed to minimize these kinds of problems

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

shown in figure 12b on page 38) 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 also adds

significant gain for even more reliable system performance. The Exten-

sion Antenna and Distribution Amplifier components are also designed to

operate in tandem, with the Extension Antenna plugged directly into the

amp, which can then feed (via cable) the antenna inputs of 6 receivers.

A combination of 2-channel receivers, a set (2 pieces) of SWASS-EXT,

and one SWA6SS, would reduce the antenna clutter of 12 transmission