Sabine SWASS-EXT-2, SWASS-EXT User Manual
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
• Wall mount or mic-stand mount
• S traight and right angle TNC connectors
®
• 130 degree reception pattern
• +18 dB gain (SW ASS-EXT)
• +22/+44 dB switchable gain (SWASS-EXT-2)
• Wood-tone finish
• Phantom-powered from either the receiver or
the distribution amp; Power LED indicator
(SWA-EXT-2)
Included with the SWASS-EXT
• One pair of antennas (left & right), each with
mic stand mounts attached
• T wo European mic stand adaptor inserts
• Four straight TNC male crimp connectors
• T wo right angle TNC male to female connectors
• Operating Guide
OVERVIEW
The SWASS-EXT Antenna Extension Kit is designed for use with Sabine SWM7000 2.4
GHz wireless microphone receivers and antenna distribution amplifiers. The SWASSEXT allows for optimal placement of external antennas for maximum wireless performance.
One SWASS-EXT kit can accommodate up to 70 receiver channels. (See block diagram
detail on page 10).
A
NTENNA
Extension antennas should be placed in an open area within visual range of the intended
transmitter locations. Note that the range of a T rue Mobility transmitter is about 100 meters,
but that structural objects can reduce that range.
C
AUTIONS
• Since the installation of the antennas influences the operating efficiency of the receiver ,
the most important rule is to minimize the distance between receiving antenna and
transmitter for better reception and performance. Make sure the antennas can “see”
the transmitter.
• Keep the system away from electrical-noise sources (electric motors, refrigerators, arc
welders, etc.). Place the SWM7000 receiver or SWA6SS Antenna Distribution Amplifier at least 1.5 meters above floor level. Keep all transmitters at least 3 meters away
from a receiver antenna.
P
LACEMENT
A
NTENNA
C
ABLIN G
& C
ABLE
L
OSS
While an extension antenna affords the opportunity to increase the distance from transmitter to receiver, there is a loss of signal in the interconnecting cable that limits that
distance. The maximum connection length is determined by the type of cable used, and
the degree of signal attenuation acceptable.
Let’s presume that an acceptable degree of loss over the tot al cable run is 6 dB. Without
external signal boosts, the different cables shown in the table would then allow maximum
lengths ranging from less than 4 M (RG-58) to 24 M (RG8/U). Thus, for a passive extension antenna, your choices are to limit the cable run, or increase your budget and buy the
more expensive, thicker cable.
Coaxial Cable Attenuation Table
Cable
Type
RG58 9203 Polyethylene #20 Stranded -16.29 14 TNC
RG58/AU 9311 Foam #20 Stranded -11.10 20 TNC
RG212/U 9861 Polyethylene #15.5 solid, -6.11 36 N
Belden
# Insulation
Polyethylene
Center
Conductor
silver plated
10 Meter
Attenuation
(in dB)
Maximum Practical
Distance
(using SWASS-EXT -2
at +22dB, in meters)
Connector
Type
RG8/U 9913 Semi-solid #10 solid -2.50 88 N
RG142 83242 Teflon #18 solid, -6.54 34 TNC
2
Polyethylene
silver plated
Fortunately, Sabine’s SWASS-EXT Active Extension Antenna offers a far better, more
cost-effective solution, due to its built-in active 18 dB signal boost. In the case of low-cost
RG-58 cable, adding an SWASS-EXT to your setup increases the acceptable maximum
cable run by more than 4 times, to 14 meters. With RG-8 cable, the maximum length is
extended to 88 meters!
Power for the Extension Antenna is delivered from any Sabine SWM7000 series receiver or
SWA6SS Antenna Distribution Amplifier.
An additional advantage of using Sabine’s SW ASS-EXT Extension Antenna stems from its
more focused, directional nature. Sabine receiver’s coaxial dipole antennas (standard equipment that mount directly on the front or rear panels of the receiver or SW A6SS) are more omni
directional in nature. In contrast, the Sabine’s Extension Antenna is sensitive to RF reception
in a 180-degree arc in front of its mounted position. It extends sensitivity to the front and offaxis side locations as it increases rear RF rejection.
The multiple functions (relocation of antenna, boost of signal, directional sensitivity) of Sabine’s
Extension Antenna mean there are many applications in which its addition to your system can
greatly enhance performance. Here’s a partial list of such applications:
1. Antenna repositioning. Provides solutions when receiver placement options are limited or
challenging. Sabine’s Extension Antenna’s multiple mounting options allow higher placement (wall mount or microphone stand mount).
2. Barriers interrupting transmission. Any time a barrier interferes with transmission and
reception, Sabine’s SW A-SSEXT can be mounted on the transmitter side of the barrier with
cable connections made on the receiver side. The most common situation of this nature
would arise when receiver and transmitter are located in separate rooms.
3. Expanded or directional sensitivity required. Sabine’ s Extension Antenna picks up in a
180-degree arc, focused towards the front. Reception in this arc is enhanced.
4. Rear RF rejection required. Because Sabine’ s Extension Antenna is less sensitive to
signals received from the rear, it can be positioned to reject any such directional RF
interference.
5. Extended operational range. Given a potential maximum cable length of almost 90 meters
from Extension Antenna to receiver , Sabine’s SW ASS-EXT allows more options for extending the distance between transmitter and receiver . Consider that RF signal strength through
air is diminished by the square of the distance (twice as far away = ¼ the signal strength),
while signal loss through cable is (roughly) inversely proportional (twice as far away = ½
the signal). That means you can use an extension antenna to replace transmission-throughair with transmission-through-cable, to help minimize signal loss.
6. Switching Gain (SW ASS-EXT-2). This model allows for two different gain settings. “LO”
is +22 dB, and “HI” is +44 dB. There should be a minimum of 12dB of cable loss before the
antenna is switched into high gain mode. If high gain is activated with less than 12dB of
cable loss the receiver front end may get overloaded. The switch should be thought of as
high = long cable, low = short cable. Refer to the chart at left and use high gain only for
extending the maximum practical distance of the cable you are using.
LIT-SWASS-EXT-OP-051123.pmd
© 2005 Sabine, Inc
3
SWASS-EXT 2.4 GHZ E
Exterior case
(wood-grained)
Antenna
component
Spacer
XTERNAL
A
NTENNA
Mic stand
mounting
bracket
White
plastic
nut
TNC
connector
Wall
mount
metal
bracket
GE N ER AL IN STRU CTIO N S
Locate and install the Left and Right antennas so that they are within line-of-sight of
1
intended wireless microphone locations.
Mic stand
connector
2
4
Line-of-sight path
Connect the SWASS-EXT “Left” and “Right” Antennas to either antenna input on
your SWM7000 receiver or SWA6SS Antenna Distribution Amplifier. NOTE: SW ASSEXT antennas are sold in Left / Right pairs and must be installed as such. Do not
install a “Right” antenna with another “Right” antenna; or conversely, a “Left” antenna with other another “Left” antenna.
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