Extension Antennas; Overview; Antenna Cabling & Cable Loss - SABINE SWM7000 Operating Manual

Extension Antennas

Fig. 12b SWASS-EXT Mic-stand mount and
wall-mount extension antennas
Coaxial Cable Attenuation Table
Cable
Type Belden #
RG58 9203
RG58/AU 9311
RG212/U 9861
RG8/U 9913 Semi-solid Polyethylene
RG142 83242
Fig. 12c Coaxial Cable Attenuation Table
IMPoRTAnT
!
Antenna Cabling Impedance
must be 50 Ohm.
Sabine Smart Spectrum ® Wireless
12. EXTEnSIon AnTEnnAS

12.1. overview

Sabine's receivers are designed for easy interface with Sabine's SWASS-EXT
Extension Antenna Kit (figure 12b). This triangular, attractive wood-grained unit is
designed to mount easily and unobtrusively on a wall (allowing either a through-
the-wall or out-the-bottom connection), or (by threading) atop a microphone stand
for a more portable or temporary positioning. Each package contains 2 Exten-
sion Antennas, all necessary mounting hardware (screws and mic stand thread
connectors) and both right-angle and straight connectors for mating with RG-58
cable (for connections to a receiver or Antenna Distribution Amplifier).
12.2. Antenna Cabling & Cable Loss
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.
Sabine's Active Extension Antenna allows for a cost-effective way of boosting
signal levels due to its built-in active switchable (+22 or +44) 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.
Insulation Conductor
Polyethylene #20 Stranded
Foam Polyethylene #20 Stranded
Polyethylene #15.5 solid,
Silver Plated
#10 Solid
Teflon #18 Solid,
Silver Plated
Power for the Extension Antenna is delivered from any Sabine SWM series
!
receiver or SWA6SS Antenna Distribution Amplifier (see Section 11).
An additional advantage of using Sabine's SWASS-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 SWA6SS) are more omni directional in nature. In contrast, the
Sabine's Extension Antenna is sensitive to RF reception in a 135-degree arc in
front of its mounted position. It extends sensitivity to the front and off-axis side
locations as it increases rear RF rejection.
NOTE: The higher boost level (+44 dB) is only recommended for very long cable
runs - at least 50 meters, or you have more than a 12 dB of cable loss. Using
this setting without that much cable loss can cause a signal overload and poor
RF performance.
The multiple functions (relocation of antenna, boost of signal, directional sensitiv-
ity) of Sabine's Extension Antenna mean there are many applications in which
its addition to your system can greatly enhance performance. Here's a short list
of such applications and operating instructions:
10 Meter
Center Attenuation (dB)
2.4 GHz 915 MHz
-16.29
-11.10
-6.11
-2.50
-6.54
38
Maximum Practical
Distance Using
SWASS-EXT set
for +22 dB boost
(meters)
2.4 GHz 915 MHz
-6.5 14 35
-4.7 20 47
-3.0 36 73
-1.3 88 170
-4.0 34 55
Connector
Type
TNC
TNC
N
N
TNC