Coaxial Cable Recommendations
Coaxial cables used to route video signals to and
the coaxial cable will be subjected to flexing during
from
the
unit
must
meet
the
video
normal use, select a cable with a stranded center
recommendations discussed in this section.
conductor.
A
Careful
of the proper cab/e
performance
assumes no
for
when
other
than those recommendedare
cases,
cab/e
75 ohms.
Materials
Use only cable with a pure copper center
conductor. Do not use cable with either a
plated steel or an aluminum center conductor
because these do not transfer signals effectively in
the frequency range used in CCTV networks. A
center conductor with low DC resistance is
required for effective CCTV operation.
The preferred dielectric material is cellular (foam)
polyethylene. It has better electrical characteristics
than solid polyethylene, but is more vulnerable to
moisture. Therefore, use only solid polyethylene
dielectric cable with a heavy exterior insulation in
applications subject to moisture. The shield must
be copper braid providing 95% or better coverage.
Cable Types
The most commonly used cable types are
and
Each is a family of cables with
widely varying electrical characteristics, some of
which are not suitable for CCTV applications.
Choose a cable type by referring to the
characteristics and maximum distances listed
below. You may exceed the maximum distances
by using video amplifiers to boost the video signal.
Materials and construction must follow the
guidelines above.
Note that
refers to bare
Solid-core bare copper conductor is best suited to
video applications, except where flexing occurs. If
copper and “TC” refers to tinned copper.
Recommended Coaxial Cable Types
Cable
Alpha
West
Type Center
Type Shield and %
DC Resistance
Max Distance for
N o .
P e n n
Conductor
Coverage
per 1000 feet
Best Picture
No.
Type No.
8213
9847
14 Solid BC
BC braid (95%)
2.6 (8.5)
820 (250)
9248
18 Solid BC
Foil + 61% TC
7.5 (24.6)
530 (160)
braid (100%)
, RG-59/U , 8281 , 9803 ,
815
, 20 Solid BC ,
2 TC braids
,
9.9 (32.5) ,
,
(96%)
RG-59/U
9259
----
816
22
Strand BC
B C braid (95%)
15.0 (49)
400 (120)
RG-59/U
2 2 Strand BC
BC braid (95%)
15.0 (49)
400 (120)