NOTE: Cable characteristics are representative of
MIL Spec MIL-C-17 characteristics for specific
RG-type cables. Designer will specify different
characteristics as necessary for specific
applications. Cable characteristics that are
different from those listed here, such as larger
diameter center conductor, dielectrics with lesser
dielectric constant, and greater (e.g., 100%)
shielding, make cables with lesser attenuation
readily available.
When lesser attenuation is needed, the designer will
enter the cable characteristic values for the cables
used as the basis for the design. For installations
in which limiting electromagnetic interference (EMI)
has significant importance, shields which provide
100% shielding and also multiple shields, of both
braided-type and foil-type, are available and for
these applications the designer will edit the
specification. For cables that will experience
frequent movement or flexing, such as cables
connected to CCTV cameras with pan and tilt
capabilities, foil-type shields are not recommended.
Similarly, for frequent flexing applications, use
of center conductors comprised of steel with
cladding or coating of higher conductivity (e.g.,
copper or aluminum) is not recommended.
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The coaxial cable shall have a characteristic impedance of 75 ohms plus or
minus 3 ohms. All cable components shall be able to withstand the
environment the cable is installed in for a minimum of 20 years. All
interior cables' insulation and jacketing material shall not contain any
poly vinyl chloride (PVC) compounds. Coaxial cable shall meet the
following requirements:
COAXIAL CABLE PARAMETERS
TYPE RG-59
Inner Conductor:
23 American Wire Gauge
Solid, Copper Covered Steel Wire
Nominal Overall Diameter of 0.058 mm
Nominal Direct current resistance at
20 degrees C of 154.2 ohms per km
Elongation of 1 percent minimum
Dielectric Core:
Solid Polyethylene
Nominal Diameter of 3.71 mm
Outer Conductor:
Single braid of 34 American Wire Gauge
bare copper wire
95 percent shield coverage minimum
Maximum Diameter of 0.485 mm
Jacket:
Manufacturer's recomendation as
required for installed location
(e.g., plenum, riser, general)
Velocity of Propagation:
66 percent nominal
SECTION 16794A
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