Technical Publications

July 9, 2012

SDI & VIDEO OUTPUT IMPEDANCE MEASUREMENT

The vast majority of coaxial cables are either 50 Ohm or 75 Ohm Characteristic Impedance. This Characteristic Impedance is determined by the ratio of the diameters of the shield and core wire and the Dielectric Constant of the insulating material between the core wire and

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July 8, 2012

THE 600 OHM AUDIO STANDARD, WHERE DID IT GO?

The standard for audio was born out of the radio industries need to set a standard, and has always been related to 600 Ohms impedance with the level measured in dBm which refers to Decibel milli-Watts of power delivered to the "load". One milli-Watt =

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600 Ohms audio stantard avm

July 8, 2012

PUSHING THE LIMITS OF HD SDI

A new type of CCTV camera has been developed to provide HD “High Definition” cameras that operate on existing 75 Ohm coaxial cable. Unlike a two way IP “Internet Protocol” HD camera that requires a network set-up and two sets of 100 Ohm twisted pair

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sdi cable sdi test sdi video sdi-1 meter

July 8, 2012

FREQUENCY CONTENT OF HD SDI CAMERA SIGNALS

Any new technology requires a little effort on the part of the user to learn the basics of that technology to use it effectively. This article discusses the digital HD SDI CCTV camera output signal at the physical layer.

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sdi camera signals sdi frequency content

July 8, 2012

SHIP-BOARD MUSIC APPLICATONS

The US Navy and Vacation Cruise Lines have long supplied entertainment on-board ship for the passengers and crew. The easiest way to distribute this entertainment is on a single coaxial cable or cable system. These cable systems are designed exactly like the ones on land.

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fm band modulator fm band transmitter fm radio modulator fm radio transmitter

December 1, 2011

BNC CONNECTORS, THE INSIDE TRUTH

Not all BNC “Bayonet Neill Concelman” that are manufactured for the CCTV video industry are created equal. To get the most out of your CCTV installation and to produce the best video images possible you should consider the brand and the manufacturer’s construction technique vary

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Bayonet Neill Concelman bnc connectors

November 21, 2011

INDUSTRIAL USES FOR VIDEO PRIVACY MASKING

Video Privacy Masks are generally used to block out specific areas of a video image. However there are other industrial uses that expand the role of these products beyond the CCTV marketplace and at the same time create other opportunities for installers to make money.

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cctv privacy cctv privacy masking video privacy masking

October 12, 2011

PUBLIC ACCESS IN THE DIGITAL AGE

As the conversion from analog to digital television continues in both the broadcast TV and cable TV industries there are many new problems to solve. This article discusses issues related to public access, the program interface and how to guarantee that audio and video signal

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video agc video level control video master vm771

September 27, 2011

PUT “HD” IN YOUR CCTV

Now there is a new HDTV camera format that is compatible with the existing 75 Ohm coaxial cable used by the analog cameras. So you can replace an analog camera with a new HD CCTV camera without having to change the system wiring.

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hd-tvi hdfm-1 sdi-c sdi-d

September 27, 2011

WHAT IS S/N RATIO & WHY IS IT IMPORTANT?

The Signal-to-Noise Ratio specification sometimes noted as “S/N Ratio”, “SNR”, or just “S/N” for cameras, amplifiers, and wireless equipment is sometimes overlooked and miss-understood. The S/N Ratio notation will show up in many specification sheets for the equipment in a CCTV system, so it must

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cm-2 S/N RATIO signal to noise ratio

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