COAXIAL CABLE RECOMMENDATIONS
Careful
selection of the proper
cable is
essential to
obtain the best performance
from this
equipment. Vicon
assumes no responsibility for
poor performance when
cables
other
than
those
recommended are installed. In all cases,
coaxial
cable impedance should be 75 ohms.
cable with a pure copper center conductor. Do not
s e cab e with either a copper-plated steel or an aluminum
enter conductor because these do not transfer signals
vel
o n
in the fre uency range used in CCTV networks. A center
with
peration.
ow DC resistance is required for effective CCTV
olid-core bare copper conductor is best suited to video
except where flexing occurs. If the coaxial cable will
e subjected to flexing during normal use, select a cable with a
center conductor.
he preferred dielectric material is cellular (foam) polyethylene.
has better electrical characteristics than solid polyethylene,
ut is more vulnerable to moisture. Therefore, use only solid
olyethylene dielectric cable with a heavy exterior insulation
applications subject to moisture.
The shield must be copper braid providing 95% or better
Installation Tips
Do not stretch cable or subject it to sharp bends.
Keep the cable out of contact with hot pipes or any other
source. Even if there is not enough heat to cause obvious damag
to the cable, transmission characteristics will be affected.
In locations where the cable must be continuously flexed (fc
example, with scanners or
an and tilt drives), use cable
tended for such movement.
cable will have stranded wir
center conductor.
Use only crimp-type BNC connectors.
Cable Types and Operating Distances
The most commonly used cable types are RG-59/U and
II/U. Each is actually a family of cables with widely
electrical
some of which are not suitable fc
CCTV applications.
The maximum camera-to-unit distance for the three most
mon cables is listed in Table A. The characteristics of the cable
in this table should be used as a guideline when cables
then Belden are used. Materials and construction must
the
uidelines above. Table gives some equivalent
n u m ers of other
Vicon recommends the fol
lowing coaxial cable types, unless otherwise specified else
where in this manual.
TABLE A
RECOMMENDED CABLES
= bare copper,
tinned copper
TABLE
DC RESISTANCE (OHMS) PER 1000 FEET
OF EQUIVALENT CABLES
