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9
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— Chapter 3. Mounting the Antennas
PES1900NR Operations Manual
32
Antenna RF Cables
A repeater uses the same type of RF cabling as a base station does. Usually, the top and bottom
jumper cables are made from flexible, 1/2” foam dielectric coaxial cable, and the main feeder lines
are made from 7/8” to 1-5/8” foam dielectric coaxial cable.
Diversity repeater configurations (Figure 5, Figure 6, Figure 7) require three RF lines:
⇒
One for the donor antenna
⇒
One for the main subscriber antenna
⇒
One for the secondary subscriber antenna, if applicable
The size of antenna coaxial cabling for an application depends upon a number of system parameters
including, but not limited to, the following:
⇒
Required signal output
⇒
Antenna gain
⇒
Transmission line length
As a signal passes through coaxial cable, the strength of that signal decreases. This loss of signal
strength, or
path loss
, decreases as the diameter of the cable increases. However, larger-diameter
cabling is more expensive and more difficult to install than smaller-diameter cabling.
The allowable transmission loss for antenna cabling, and therefore the size of the cabling, is specified
in the site plan or network engineering documentation for the project. Do
not
install cabling of a
different size than specified.
Coaxial Cable Installation
To install coaxial cabling:
1. Raise the cable up the tower to the antenna.
2. Connect the coaxial cable to the antenna.
3. Securely install the cable so that it reaches to the installation site of the PES1900Gi NR, with
enough room to connect to the repeater.
4. Secure the cable to the tower or structure about every 3 feet or 0.9 meters.
5. Terminate the cable with a Type N connector. If the feedlines are larger than ½ -inch, use Type
N (female) connectors.
6. If the cable is larger than ½-inch (1.3 cm) in diameter, attach a coaxial jumper assembly to the
Type N (f) connector on the antenna cable. Make the jumper assembly of ½-inch (1.3 cm) coaxial
cabling and Type N (male) connectors.
CAUTION:
If a coaxial cable is larger than ½-inch (1.3 cm) in diameter, do not connect it directly to
an antenna port on the repeater, as possible damage could result. The coaxial jumper
assembly reduces strain on equipment connectors.
7. Repeat for the remaining antennas.