Site considerations
98-175666-C
Chapter 2: Installation
2-16
2.2.6 Alternative ADU cable
The allowed RF loss in the antenna cable is determined by the attenuators of the
antenna. The electronic design guarantees that minimum 20 dB RF loss @ 1700 MHz
(S1000) and 20 dB RF loss @ 1950 MHz (S600) and maximum 35 dB RF loss @4450 MHz
in the antenna cable will work, but typically an RF loss of about 25 dB will be within the
limits of the cable calibration. You can verify the cable attenuation margin with the
Azimuth calibration (user controlled)
on page 4-35 for more
details.
The DC loop resistance of the antenna cable must be maximum 0.9 Ohm. This is to
ensure the power requirements from BDU to the antenna and to ensure the
performance of the system. Preferably choose one of the cable types listed in the table
below.
If you want to use an alternative ADU cable make sure that the following requirements
are fulfilled:
1. Check the data sheet from the cable supplier and verify the values:
The RF- attenuation and the DC loop resistance are kept within the maximum
specified values:
2. Ensure that the specified minimum bending radius is respected. If this is not the
case, the loss in the cable will increase. Check the documentation from the cable
supplier.
Cable Type
Absolute max.
length (m)
Absolute max.
length (ft)
RG223-D
25 m
80 ft
RG214/U
50 m
160 ft
S 07272B-05
95 m
310 ft
LMR-600-50
135 m
440 ft
LDF4.5-50 Andrew
300 m
980 ft
Table 2-10: ADU cable types and maximum lengths
Antenna cable data
ADU cable RF-attenuation
at 1950 MHz: Max. 20 dB including connector.
ADU cable RF-attenuation
at 4450 MHz: Max. 35 dB including connector.
ADU cable modem-
attenuation
at 10 MHz: Max. 2 dB
ADU cable DC loop resistance max: 0.9 Ohm
Table 2-11: Antenna cable data
