TECH TIP
Subject: Coaxial Connectors
Product: All Video
Number: 1400-0001-05-00
Date: 07/03/01
VICON TECHNICAL SERVICES GROUP
Connector Types
There are various electrical connector types available for coaxial cable. Mechanically, they can be
installed on a wide variety of cables but their physical differences are as varied as their electrical
differences.
•
Crimp-on type “F” connector. This type of connector is designed for, and used in broadcast
television where a considerably higher band of frequencies exist, as opposed to those found
in CCTV. The cable center conductor is actually the connector center pin. Connectors of this
type are usually found in cable television (CATV) installations. This is the type found in most
home television systems. “F” connectors should never be used in a CCTV installation.
“F” Connector
•
Twist-on connector. The name twist-on comes from the fact that, after the cable is stripped to
the correct lengths, the connector is actually twisted, or screwed, on to the cable. The barrel
has coarse internal threads that contact the shield braid. It also has a center pin which
“threads” on to the center conductor. These connectors can easily be distinguished by the
approximate ¾
” hexagonal barrel on the rear of the connector. Due to the signal loss that
occurs over time with these connectors, their use for CCTV is not recommended.
Twist-On BNC Connector
•
Two-piece crimp-on connector. The cable center conductor is pushed into the connector
center pin where it is gripped by spring contacts. The ferrule is then slipped up the cable over
the braid and then crimped with an appropriate tool. The crimping action sandwiches the
braid between the ferrule and the connector barrel, providing a solid electrical connection.
•
Three-piece crimp-on connector. This type has a separate center pin that is first crimped onto
the center conductor. The rest of the assembly is similar to the two-piece type.
2-Piece
BNC
3-Piece
BNC
Either two or three piece connectors are suitable for CCTV use but three piece are preferred.
Vicon Industries Technical Services Group
800-348-4266
Fax 631-951-2288
www.vicon-cctv.com
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