SABINE SWASS-EXT Operating Manual Download Page 8

8

INSTALLATION CAUTIONS

Extension Antenna cables — For best results, use high quality coaxial cable with a 50
Ohm impedance.  Specifications will vary by cable manufacturer. For best results, use
cable with minimal attenuation. The longer your cable, the more you will reduce the 100-
meter range between transmitter and receiver antenna. A well-placed pair of extension
antennas will eliminate trouble spots and generally improve overall performance of the
wireless.

C

OMMON

 S

OURCES

 

OF

 RF I

NTERFERENCE

The typical sources of interference for conventional wireless mics can be high-powered
broadcasters such as radio stations and TV transmitters, or other short-range wireless
devices, including multiple radio microphones operating at the same location (either by
design, or by coincidence), that operate in proximate (or harmonically related) bands.
Less commonly, interference may arise from spurious outputs emitted by electronic equip-
ment (notably computers, printers, or similar devices with digital clocks), faulty electrical
equipment, neon signs, dimmers and lighting controllers, and so forth.

Many UHF and VHF mics are especially vulnerable because they share the RF spectrum
with the very high-powered transmitters for television. The coming conversion to digital
and high-definition broadcast will increase the problems for UHF and VHF.

The 2.4 to 2.4835 GHz frequency band is not only well above the fundamental (nominal)
transmission frequencies of such strong analog and digital broadcasts, but also high enough
to escape interference problems occurring at the strong first harmonic of even the highest
digital television broadcast. The band is approved worldwide for a variety of uses, includ-
ing such diverse transmitters as baby monitors, garage door openers, wireless LANs,
amateur satellite, cordless telephones, etc. Compared to RF broadcast sources like tele-
vision 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.

Summary of Contents for SWASS-EXT

Page 1: ...ing Guide 2 4 GHz Smart Spectrum Extension Antenna Kit SWASS EXT SWASS EXT 2 Operating Guide for use with models SWA6SS SW71 R SW72 R SW72 NDR SWASS EXT benefits Wallmountormic standmount Straight and...

Page 2: ...5 meters above floor level Keep all transmitters at least 3 meters away from a receiver antenna ANTENNA CABLING CABLE LOSS While an extension antenna affords the opportunity to increase the distance...

Page 3: ...pting transmission Any time a barrier interferes with transmission and reception Sabine s SWA SSEXTcan be mounted on the transmitter side of the barrier with cable connections made on the receiver sid...

Page 4: ...stall the Left and Right antennas so that they are within line of sight of intended wireless microphone locations Connect the SWASS EXT Left and Right Antennas to either antenna input on your SWM7000...

Page 5: ...nas are within 100 or so feet Separate them about 20 to 25 feet in very large rooms or fields If you put the antennas too far apart i e at opposite ends of the room or in separate rooms to improve cov...

Page 6: ...t of the antenna assembly Unscrew the black microphone mount from the antenna assembly Using fingers only unscrew the white plastic nut and remove the antenna component from the metal bracket Attach t...

Page 7: ...ard SWASS EXT switchable gain and a phantom power LED indicator 1 To switch gain settings start by removing the cover The HI LO switch is easy to see at the lower right of the antenna assembly CAUTION...

Page 8: ...definition broadcast will increase the problems for UHF and VHF The 2 4 to 2 4835 GHz frequency band is not only well above the fundamental nominal transmission frequencies of such strong analog and...

Page 9: ...k devices allow computers to connect via wireless devices that act as both receivers and transmitters These low powered transceivers often have select able channels and can utilize the entire 2 4 GHz...

Page 10: ...lled as such Do not install a Right antenna with another Right an tenna or conversely a Left antenna with other another Left antenna IMPORTANT Active Electronics Antenna Sabine wireless receivers prov...

Page 11: ...rchaser Sabine s liability to the purchaser for damages from any cause whatsoever and regardless of the form of action including negligence is limited to the actual damages up to the greater of 500 00...

Page 12: ...2000 USA 386 418 2001 fax www Sabine com IMPORTANT Active Electronics Antenna Sabine wireless receivers provide antennas with active electronics The inputs to the receiver antenna distributor amplifie...

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