Technical Publications

April 20, 2013

HOW TO ELIMINATE RADIO INTERFERANCE ON CCTV

If you install a lot of CCTV video systems, at one time or another you have probably experienced outside interference from one or more of a number of sources. The most common interference found in CCTV systems is ground loop 60 Hertz energy originating from

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December 6, 2012

WHAT IS SO SPECIAL ABOUT A SINE WAVE?

First of all, what is a sine wave anyway, and why is that particular wave shape important? The exact shape of a sine wave is very important to the field of electronics because it is the only wave shape that has energy at only one

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signwave

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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impedance meter output impedance source impedance

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

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