User's Manual

B-10 8000-2803-01, Rev. 1/A Managing RF Passage Antenna Performance
The antenna coupling loop must be mounted just
above the third cutout.
1. Determine how you will install antenna wire
between antenna and source of interference.
Site requirements for safety and appearance
will influence how wire is installed. Antenna wire
can exit antenna from top or bottom to meet
installation requirements.
2. Attach antenna coupling loop to antenna. It is
important to accurately position bottom of loop.
Use packing or duct tape to attach loop to either
side of antenna so that bottom of loop is .6cm
(.25in.) above the top of third cutout and so that
it extends the full distance between vertical
antenna channels (from left to right).
Once bottom of loop is secure, extend rest of
loop vertically, along antenna channels and
secure. Positioning of upper portion of antenna
coupling loop is not critical.
Note: Splice can be positioned at top or bottom
of antenna to accommodate antenna wire
exiting at top or bottom of antenna. Be sure
bottom of loop is positioned accurately.
When installed, antenna coupling loop should
look like this:
3. Run antenna wire to top or bottom of antenna.
Route wire to back edge so that end caps can
be installed when installation is complete.
4. Run antenna wire along selected installation
route to source of interference.
5. Prepare wire for connection to coil.
If cutting antenna wire at this point, leave a
generous allowance for positioning coil. Strip
about 4cm (1.5in.) of outer sheath. Strip 2cm
(.75in.) of insulation from each wire.
Install Coils
For effective cancellation, coils must be positioned
as close as possible to source of interference. As a
general rule, the stronger the interference, the
closer the coil will need to be positioned to it.
Consider the following guidelines when positioning
coils for noise cancellation:
• Position coils to achieve the lowest possible
noise level within the typical range.
• Test antenna performance in addition to
adjusting noise levels. Noise levels affect
system performance to different degrees based
on the source of interference. A noise level of
1.3V may compromise system performance
mildly or significantly, depending on its source.
Based on conditions at the site, you may need to
connect one coil or multiple coils to the antenna
wire. If there are several affected antennas, the
wiring configuration may include both types of
connections.
When multiple sources of interference and/or
multiple antennas require cancellation coils, the
positioning and fine tuning of coils is an iterative
Third Cutout from Top
Antenna Coupling
Loop
.6cm (.25in.) from
Top of Cutout
Area of Critical
Positioning