Step 3. Covering Rubber Tape with Electrical Tape
Tightly wrap the rubber tape with 2 layers of electrical tape to protect the vapor wrap.
Note: The electrical tape should extend 1 inch beyond the vapor wrap to ensure full
coverage. You can easily remove the weatherproofing by cutting down one side of the
wrap and peeling it away.
Electrical Tape
Figure 27: Covering Rubber
Tape with Electrical Tape
4.8 Antenna Alignment
Rough alignment:
This is fairly straight forward. Since it is a prerequisite that you have
line of sight between the two points, here are several ideas that have worked for
installers:
•
Aim the units towards each other
•
During midday, use a mirror or compact disk to create a reflection directed
towards the other site while someone watches for the flash
•
Plot out the path on a topographical map and set the antennas using a
compass
How close in alignment do the antennas need to be?
+/- 10 degrees will be
adequate for most paths using a 14dBi gain antenna. With high gain antennas, +/- 1
degree may be necessary.
Alignment indicators:
Due to the nature of digital modulation and the associated
circuitry, there is no analog test point at which the signal strength can be monitored.
You must have the GUI hooked up so that the signal strength can be seen. Align the
antennas, one at a time, both vertically and horizontally, until the maximum signal
strength is attained.
4.9 Interference Solutions
Sometimes, after installation, interference problems develop with external devices,
and/or external devices are later installed that affect the Trailblazer. To determine if the
Trailblazer is an interferer, power down the radio unit and check if the interference is
eliminated. To determine if an external device is interfering with the Trailblazer, shut
down suspected devices while listening to an audible tone (such as dial tone) on a
phone connected to the Trailblazer.
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