SABINE SW71-NDR User Manual page 37

1. Antenna Repositioning. Provides solutions when receiver placement op-
tions 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. Anytime a barrier interferes with trans-
mission and reception, Sabine's SWA-SSEXT-2 can be mounted on the
transmitter side of the barrier with cable connections made on the receiver
side. Perhaps 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 An-
tenna picks up in a 135-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 SWASS-
EXT-2 allows more options for extending the distance between transmitter
and receiver. (It should be noted that the typical range of Sabine's SWM7000
series systems without the Extension Antenna is already 100 meters in
typical circumstances). Consider that RF signal strength through the 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 propor-
tional (twice as far away = ½ the signal). That means you can use an
extension antenna to replace transmission-through-air with transmission-
through-cable, to help minimize signal loss.
6. Placing extension antennas. The assymetrical pattern of each antenna
helps reduce the chance for a null spot in your room. Position the one
marked LEFT at stage left (on the left hand side of a performer facing the
audience) and so on. When you mount the extension antennas on a stand
or on a wall, make sure the short end of the triangle is up.
7. In order for the system to be effective, both extension antennas should be
in a good pickup position at all times but separated by about ten or fifteen
feet if the antennas are within 100 or so feet.
8. If you put the antennas too far apart, i.e., at opposite ends of the room, or in
separate rooms, to improve coverage, diversity is defeated and you will
get dropouts. In other words, diversity is more important that coverage. If
you mount the extension antennas in the ceiling, the antennas metallic
backplane must be orientated parallel to the floor and the antennas must
not be blocked by pillars, lights or similar obstructions. Aim the hole in the
plastic cover toward the podium.
9. Do not daisy-chain extension antennas together in series. Receivers
and the antenna distribution amp are only designed to use one left and
one right antenna.
10. Extension Antenna Cables: Use coax cable to connect the extension
antennas to the receiver or to the ADA. See the chart on the previous page
for cable specifications. Use the SWATNC-N step-down cable to connect
thicker RG8 cables to the extension antenna.
11. The SWASS-EXT-2 extension antennas add either 22 or 44 dB signal
strength to overcome cable loss. Bad crimp connections are a common
cause of dropouts. Check them carefully!
Extension Antennas
!
Active Electronics Antenna
Sabine wireless receivers provide
antennas with active electronics. The
inputs to the receiver & antenna dis-
tributor amplifier have phantom power
available for this purpose.
The red LED on the inside of the an-
tenna cover indicates phantom power
(3V) is good.
DO NOT SHORT TO GROUND
The SWASS-EXT-2 features:
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•
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•
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37
Sabine 2.4 GHz Smart Spectrum
IMPORTANT !
Wall or mic-stand mount
Straight and right angle TNC
connectors
135 degree reception pattern
+22 or +44 dB boost in RF
Matched pairs
Wood-tone finish
Phantom-powered from ei-
ther the receiver or the distri-
bution amp
®
Wireless
LIT-SWM7000-OG-EN-070615.pmd - rr