Preparation | 77
Aprisa SR+ User Manual 1.11.1
Coaxial Feeder Cables
To ensure maximum performance, it is recommended that you use good quality low-loss coaxial cable for
all feeder runs. When selecting a coaxial cable consider the following:
Factor
Effect
Attenuation
Short cables and larger diameter cables have less attenuation
Cost
Smaller diameter cables are cheaper
Ease of installation
Easier with smaller diameter cables or short cables
For installations requiring long feeder cable runs, use the RFI AVA5 50, RFI LDF4 50A or RFI CNT-400 feeder
cable or equivalent:
Part Number
Part Description
Specification
RFI AVA5 50
Feeder Cable, 7/8", HELIAX, Low loss
7/8" foam dielectric. Standard Jacket
Outer conductor corrugated copper, inner
conductor copper-clad aluminum
Bending radius of 250 mm min
Attenuation of 2.65 dB / 100m @ 520 MHz
RFI LDF4 50A
Feeder cable, 1/2", HELIAX, Loss
1/2" foam dielectric. Standard Jacket
Outer conductor corrugated copper, inner
conductor copper-clad aluminum
Bending radius of 125 mm min
Attenuation of 5.1 dB / 100m @ 520 MHz
RFI CNT 400
Feeder, CNT-400, 10.8mm, Double
Shielded Solid Polyethylene
Low loss 0.4
’
(10.8 mm) feeder cable
UV protected black Polyethylene, bonded
AL tape outer conductor
Bending radius of 30 mm min
Attenuation of 8.8 dB / 100m @ 450 MHz
For installations requiring short feeder cable runs, use the RFI 8223 feeder cable or equivalent:
Part Number
Part Description
Specification
RFI 8223
Feeder, RG 223 5.4mm d, Double
Shielded Solid Polyethylene
Bending radius of 20 mm min
Attenuation of 30.5 dB / 100m @ 450 MHz
When running cables:
Run coaxial feeder cable from the installation to the antenna, ensuring you leave enough extra cable at
each end to allow drip loops to be formed.
Terminate and ground the feeder cables in accordance with the manufacturers
’
instructions. Bond the outer
conductor of the coaxial feeder cables to the base of the tower mast.
Linking System Plan
All of the above factors combine in any proposed installation to create a Linking System Plan. The Linking
System Plan predicts how well the radios will perform after it is installed.
Use the outputs of the Linking System Plan during commissioning to confirm the radios have been installed
correctly and that it will provide reliable service.
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