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variety of uses, including such diverse transmitters as baby monitors, garage door openers, wireless LANs,
amateur satellite, cordless telephones, etc. Compared to RF broadcast sources like television and radio stations,
these low power devices produce very localized, short range interference; furthermore, many of the devices
working in the 2.4 GHz range use spread spectrum transmission and reception. Both of these facts mean such
uses of the RF spectrum are less likely to cause interference with, or suffer from interference from the use of,
Sabine’s systems.
Your first step in checking for interference should be utilizing the Scan function in the SWM7000 Remote Control
Software. RF scanning will reveal potential RF sources in your location and allow you to make an informed choice
of channels to use. The scanner can scan for long periods of time and will give you a report of RF activity over time
for each of the 70 channels available on your Smart Spectrum system. See Section 13.4.2.5 RF Scan of the
SWM7000 Operating Guide for more details on RF scanning.
1. Microwave ovens
In the vast majority of situations, interference from microwave ovens will not affect performance of your
SWM7000 series microphone systems. Since barriers such as walls work to block interference, a microwave
oven will likely present a problem only when located in fairly close proximity within the same room as the
wireless receiver (or reception antenna). See caution below.
Commercial quality microwave ovens present a bigger potential problem. They sweep over a wider band of
frequencies than the limited band affected by consumer units, and use two magnetron tubes which alternate
to avoid inactivity during a power cycle. Fortunately, Sabine systems are only affected by such ovens in close
proximity to receiver antennas. That protection, plus the availability of 70 different RF channels to choose from,
makes serious interference problems arising from microwave ovens avoidable and unlikely. See caution
below.
2. Wireless Local Area Networks (WLANS)
These computer network devices allow computers to connect via wireless devices that act as both receivers
and transmitters. These low-powered transceivers often have selectable channels and can utilize the entire
2.4 GHz band. In general, Sabine microphones should not be affected by these WLANS because their spread
spectrum technology does not present a problem for the Sabine Smart Spectrum
TM
system. See caution below.
3. Cordless phones
These home telephones broadcast at very low power and should not present interference problems for your
Sabine wireless. This is especially true if the telephone uses spread spectrum technology. See caution below.
4. Wireless Video Cameras
Certain wireless video cameras (X10, for example) use the 2.4 GHz band. These devices are also very low
power and, in general, should not present a problem when using the SWM7000 system. See Section 5
Receiver Operation for methods of optimizing clear reception and minimizing interference. See caution
below.
As a general precaution, keep 2.4 GHz cordless telephones, microwave ovens, WLAN antennas and 2.4 GHz wireless video camera
transmitters twice the distance from your Sabine wireless microphone system antennas as that of your Sabine 2.4 GHz transmitters.
Antenna Placement Caution
Antenna Distribution Amplifier Installation Cautions
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