XX002 Rev 799 Surveyor99 Dome System
Reference
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53
Reference
Coaxial Cable
CAUTION: 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.
Materials
Use only cable with a pure copper center conductor. Do not use cable with either a copper-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. Solid-core bare copper conductor is
best suited to video applications, except where flexing occurs. If the coaxial cable will be subjected to flexing during
normal use, select a cable with a stranded center conductor. 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.
Cable Types
The most commonly used cable types are RG-59/U and RG-11/U. Each is actually 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. The maximum distance for
best picture refers to the distance between the receiver and the transmitter. The characteristics of the cables in this table
should be used as a guideline when cables other then Belden are used. Materials and construction must follow the
guidelines above. Note that “BC” refers to bare copper and “TC” refers to tinned copper.
Cable
Type
Belden
Type No.
Alpha
Type
No.
West Penn
Type No.
Type Center
Conductor
Type Shield and
% Coverage
DCR/
1000 ft
(km)
RG-11/U 8213
9847
811,4811
14 Solid BC
BC braid (95%)
2.6 (8.5)
RG-6/U
9248
9804C
806,4806
18 Solid BC
Foil + 61% TC
braid (100%)
7.5 (24.6)
RG-59/U 8281
9803
815
20 Solid BC
2 TC braids (96%)
9.9 (32.5)
RG-59/U 9259
----
816
22 Strand BC
BC braid (95%)
15.0 (49)
RG-59/U 9659
----
----
22 Strand BC
BC braid (95%)
15.0 (49)
Table 3
Recommended Coaxial Cable Types
Picture Quality
Cable Length (max)
ft (m)
RG-59/U
RG-6/U
RG-11/U
Dim, faint picture.
Cable amplification required.
Greater than 1100
(350)
Greater than 1500
(450)
Greater than 2400
(750)
Usable picture
1100 (350)
1500 (450)
2400 (750)
Clean picture
820 (250)
1000 (300)
1600 (500)
Best picture
400 (120)
530 (160)
820 (250)
Table 4
Picture Quality vs Cable Length
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