Adtran TRC4208 Manual Do Utilizador
Section 2 Microwave Path Engineering Basics
TRACER 4208 System Manual
18
© 2003 ADTRAN, Inc.
612804208L1-1A
Carrier Wavelength (
λ)
The carrier wavelength is the physical wavelength of the main RF carrier being used for communication,
and is usually approximated at the center frequency of the band (which is 5787.5 MHz for the
TRACER 4208). The carrier wavelength calculations follow:
and is usually approximated at the center frequency of the band (which is 5787.5 MHz for the
TRACER 4208). The carrier wavelength calculations follow:
λ = c / f (meters)
where
c = speed of light (in meters)
f = frequency (in Hz)
f = frequency (in Hz)
resulting in the following carrier wavelength:
λ = 3.00 x 10¯
8
/ 5787.5 x 10
5
= 0.0518 m or 5.18 cm
Path Distance (d)
The path distance is simply the physical distance between the transmit and receive antennas. For the
TRACER 4208, these distances can range up to 30 miles.
TRACER 4208, these distances can range up to 30 miles.
System Losses (L)
System losses are defined by RF coaxial cable loss, connector losses, and losses added from any additional
lightning protection devices for the power budget analysis. Coaxial cable is required to attach the
TRACER 4208 to the antenna. The length of the cable varies from a few feet to several feet, depending
upon your application and the proximity of the TRACER 4208 to the antenna. Various grades of coaxial
cable will work sufficiently well for connecting the TRACER 4208 unit to the antenna. A low-loss coaxial
cable will minimize cable losses.
lightning protection devices for the power budget analysis. Coaxial cable is required to attach the
TRACER 4208 to the antenna. The length of the cable varies from a few feet to several feet, depending
upon your application and the proximity of the TRACER 4208 to the antenna. Various grades of coaxial
cable will work sufficiently well for connecting the TRACER 4208 unit to the antenna. A low-loss coaxial
cable will minimize cable losses.
One end of the coaxial cable requires an N-type male connector (plug) to mate with the TRACER 4208
unit. The other end of the coaxial cable requires a connector compatible with the antenna chosen for the
installation (usually an N-type male connector). Additionally, ADTRAN recommends that the outdoor
connector on the coaxial cable be weatherproofed to prevent corrosion and electrical shorting.
unit. The other end of the coaxial cable requires a connector compatible with the antenna chosen for the
installation (usually an N-type male connector). Additionally, ADTRAN recommends that the outdoor
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 in the downstream path from damaging voltages and currents
(including the TRACER 4208 unit).
directly on the antenna coaxial cable. Installing lightning arrestors helps protect the
RF electronics in the downstream path from damaging voltages and currents
(including the TRACER 4208 unit).