Path Loss (Lp); Table 3. Typical Coaxial Loss For Common Cable Types - ADTRAN TRACER 6000 SERIES User Manual

Section 2 Microwave Path Engineering Basics
connector on the coaxial cable be weatherproofed to prevent corrosion and electrical shorting.
In areas where lightning strikes are frequent, a lightning arrestor should be installed
directly on the antenna coaxial cable. Installing lightning arrestors helps protect the
RF electronics (including the TRACER 6320 unit) in the downstream path from
damaging voltages and currents.
IF lightning arrestors must have the ability to pass DC voltages (up to ± 60 volts)
and should be installed with care.
Table 3 gives typical loss figures for some of the more common coaxial cable types (per 100 feet or
30.5 meters).

Table 3. Typical Coaxial Loss for Common Cable Types

Path Loss (L )
P
Path loss is the estimated attenuation between the transmit and receive antennas caused by signal
separation and scattering. The path loss is considered basic transmission loss over the microwave link. The
following expression calculates path loss:
where
f carrier frequency (Hz)
λ
carrier wavelength (c / f) (meters)
d path distance (meters)
c speed of light, free-space (meters)
20
Cable Type
RG58
RG8 (air)
RG8 (foam)
1/4" Coax
3/8" Coax
1/2" Coax
5/8" Coax
7/8" Coax
1 1/4" Coax
1 5/8" Coax
5.8 GHz Elliptical Waveguide
π π
⎞ 2
⎛ ⎛
4 d 4
--------- - ----------- -
L P = =
⎝ ⎠ ⎝
λ
Copyright © 2005 ADTRAN, Inc.
TRACER 6000 Series Split System Manual
5.8 GHz Loss/100 ft (in dB)
N/A
N/A
N/A
11.36
9.65
6.49
4.90
N/A
N/A
N/A
1.23
⎞ 2
df
(dB)
⎠
c
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