Posts Tagged ‘ video transmission’



BNC-100 CCTV Video and Power Cable

Written By:
Friday, April 8th, 2011

The BNC-100 CCTV Video and Power Cable is one item offered by Security Camera King (SCK) that combines two functions into one unit.  This cable provides the means for both video transmission from the digital video security camera to the Digital Video Recorder or DVR and the power supply from the power distribution box or plug-in transformer to the camera.

Video transmission signals are a special type of radio frequency signal.  These signals can be transported in many different ways.  For example, digital video cameras can send the video transmissions wirelessly using on-board transmitters and antennas to corresponding wireless receivers.  The other option involves using wires or cable.

There are many different types of wiring or cable that can be used as video transmission cable for digital video security cameras.  CAT5 Ethernet Twisted pair cable, for example, can be used to send video transmission signals depending on the strength of the signal and the length of the cable run.

The most popular type of cable however, is RG-59 Coaxial Cable.  This cable is advantageous for several reasons.  First it provides a prefect medium for which the signal can travel without excessive degradation of the signal.  Secondly, it is sheathed to prevent interference to the signal.  BNC-100 CCTV Video and Power Cable is RG-59 coaxial cable.

Our BNC-100 CCTV Video and Power cable is pre-cut to a length of exactly 100 feet.  Each end of the cable has a pre-installed female BNC type connector for connecting the camera end and the DVR end of the cable.  There is no need to mess with cutting or stripping wire and twisting or crimping connectors since that is already done for you.

In addition, our BNC-100 CCTV Video and Power Cable also contains a one pair (two wire) DC power supply cable.   This cable is terminated on each end with one male and one female PT-3 2.5mm power plug for easy connection to the camera and the power supply.

This video transmission cable is also shielded to prevent interference from the proximity tot he power cable and from any outside sources.  The impedance of the BNC-100 CCTV Video and Power Cable video transmission cable is 75 ohms.

The “BNC” in BNC-100 CCTV Video and Power cable doesn’t refer to the cable as much as it does the connector type.  In fact, most cable used with BNC fittings is RG-59 coaxial cable (and not BNC cable).

The BNC is a radio frequency connector that is commonly used with coaxial cable for television, radio, and other radio-frequency related type equipment.  BNC is an acronym that is used when referring to these special connectors.  In fact, the “B” in BNC-100 CCTV Video and Power cable stands for bayonet mount, the actual locking mechanism used by these connectors.  When to connectors (a male and a female type) are joined together, they are pushed into one another and twisted by their “collar” to lock them together.  Just like the way a bayonet is mounted on a rifle.

 

The remaining two letters of BNC stand for its inventors, Paul Neill and Carl Councelman.  One must agree that BNC is a much easier way of referring to the connector than by saying “Bayonet, Neill, and Councelman” connector.

 

If you have any further questions about the BNC-100 CCTV Video and power cable or BNC connectors or would like to purchase the cable please contact one of our security experts either by on-line “Live Chat” or by telephone at 866-573-8878 Monday through Friday from 9AM to 6PM EST.

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Security Camera Cables

Written By:
Friday, March 4th, 2011

If you have a “wired” digital video system, you’ll want to make sure you have the correct security camera cables for it.  In this article we’ll take a look at the most common type of security camera cable and its connectors.

Digital video security cameras generally require two types of cable; one for video transmission of the camera to the DVR (Digital Video Recorder) and one for the power supply for the camera from a power supply source.

The most common security camera cable used today is the RG-59/U.  This is a coaxial cable designed specifically for low-power video signals.   Historically speaking, the name of the cable originates from the U.S. military.  RG-59 designated the type of cable and the “U” stood for general utility use.  However, the “RG” (which stood for “Radio, General”) component is no longer part of military standards, however the name use has remained, generally without the “/U” designation.

RG-59 security camera cable has a unique characteristic that makes it a good match for use with video transmissions.  It has the same impedance as an antenna, such as the “rabbit ears” type that was used on televisions.  This impedance of 75 ohms makes the cable a good choice for radio frequency transmissions for televisions, DVRs, and security camera video.  RG-59 is smaller than typical cable television cable, RG-6, and is therefore less obtrusive and easier to manipulate.

However, RG-59 has a tendency toward high-frequency losses over long distances (greater than RG-6 for example) but 750 feet seems to be a generally agreed upon length before significant losses appear.  These can also be corrected with drop amplifiers or active (powered) baluns to boost signals.  For most security camera systems applications, RG-59 coaxial cable works well.

The RG-59 security camera cable consists of an outer plastic sheath (the colored cover or jacket of the cable), followed by a copper braid shield (it looks like a mesh or netting of fine wire), underneath which is an inner dielectric insulator (often looks like a milky white thick plastic material somewhat like a drinking straw) that contains a copper-plated or solid copper (better performance) center wire core.

RG-59 cable is usually fitted with one of three different types of connector; F connectors (used most commonly for cable television applications), RCA plugs (often used by DVD players), and BNC connectors.  By far the most common type of security camera cable connector is the BNC.

The BNC connector provides a means of connection for both the shield and core of the cable.  The connector has “male” and “female” plug types that when inserted together and twisted properly, stay locked together.  In fact “BNC” stands for the bayonet like locking mechanism (B), and Paul Neill (N) and Carl Concelman (C) it’s inventors.

Security Camera King offers three different types of BNC connectors based on how they attach to the RG-59 cable.  Connectors are fastened to the security camera cables either by twisting on, crimping, or compression.  Twisting is the simplest and requires no additional tools once the wire is stripped and trimmed.  Crimping, when done properly, generally holds the connector to the cable better but requires the use of a crimping tool.  The best connection that provides the greatest strength is the compression BNC and it requires a compression tool.

Security cameras also require a power supply cable.  This is normally standard 18 gauge copper wire with plastic insulation.  The power for most security cameras is low voltage DC current of 12 volts or low voltage AC current of only 24 volts and this wire is suitable for carrying the power supply of either.  The power supply cable that terminates at the security camera end usually does so using either screw terminals for each wire (often for AC) or a 2.5 mm female type power plug (often for DC) with a positive center.

Security Camera King offers complete security camera systems that include security camera cables for both power and video transmission.  We offer pre-cut lengths of video and power supply cable with connectors already installed for “plug n play” use.

For applications with differing distances of cameras from the DVR, we offer bulk Siamese RG-59/18-2 cable with twist-on connectors.  This cable consists of both the RG-59 video transmission cable and the 18 gauge 2-wire power supply cable.  One cable means one run per camera saving you time and work.

There also offer other types of less common security camera cables.  Check our Web catalog for more information.

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