l
Maximum loss for the feed line and connectors must be less
than 3 dB.
l
It may be necessary to use more than one type of coax in an
installation. The FSJ4-50B cable is very flexible and may be used
for the last section of a coax run to the R450 DC if the additional
flexibility is required.
l
The feed line must be bonded at the top of the tower and at the
base of the tower. Andrew bonding kits and procedures should be
used for all bonds.
l
For towers over 150 feet tall, the feed line should be bonded at
regular intervals down the tower. The general recommendation is
that the feed line be bounded by a minimum of 200 feet. Site
requirements and standard practices should dictate the
configuration.
l
An optional surge protector may be installed on the tower near the
antenna to help protect the feed line but is not required.
l
For the AVA5-50B cable or larger, jumpers should be used to go
between the larger cable and the R450 DC and antenna connectors.
l
Andrew provides installation instructions for Heliax Coaxial Cable.
See Bulletin 17800B Revision C. Neptune can supply a PDF copy
by request through Customer Support.
Neptune Part Numbers
The following tables provides Neptune part numbers for cable and
connectors.
Neptune
Part
Number
Andrew
Part
Number
Coax
Diameter
Loss per
100'
Minimum
Bend
Radius
Weight
per Foot
Maximum
Length
Notes
10046-116
FSJ4-50B
1/2"
2.31 dB
1.25"
0.14
100'
Should only be
used for
jumpers and
short cable run
10046-119
LDF4-50A
1/2"
1.45 dB
5"
0.15
150'
Recommended
antenna cable
for 150' cable
runs or less
10046-118
AVA5-50
7/8"
0.74 dB
10"
0.30
400'
Recommended
antenna cable
for runs over
150'
Table 13 – Neptune Part Numbers for Cable and Connectors
R450 Data Collector Installation and Maintenance Guide
87
Appendix A: RF Antenna Installation
Summary of Contents for R450
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