Site considerations
98-175666-A Chapter 2: Installation 2-19
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 (100 cm
antenna) and 20 DB RF loss @ 1950 MHz (60 cm antenna) and maximum 35 dB RF loss
@4450 MHZ (60 cm antenna) 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 cable calibration. See Azimuth calibration (user
controlled) on page 4-30 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 Thickness
Max.
length (m)
Max.
length (ft)
RG214 3/8” 50 m 164 ft
LMR-400 0.405” 85 m 280 ft
LMR-600 1/2” 135 m 442 ft
LDF4.5-50 Andrew 5/8” 300 m 984 ft
Table 2-11: Alternative antenna cables and 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 2-12: Antenna cable data
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