Technical Publications

April 7, 2008

NTSC VIDEO PRE/DE-EMPHASIS NETWORK LOSS

Video Pre-Emphasis and De-Emphasis is used with Frequency Modulation (FM) transmission systems. It is used to offset the triangular noise distribution created by FM transmission systems. FM Fiber, Satellite and microwave transmission systems exhibit this kind of triangular noise pattern.

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April 7, 2008

PICTURE QUALITY TESTING OF CCTV SYSTEMS

Picture quality can be defined by many different parameters, but the most important from an observed picture detail point of view is the LINES OF DEFINITION as observed on a Monitor. The larger the "number of lines" that can be distinguished, the greater the detail

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line resolution lines of definition vertical lines of definition

April 6, 2008

HOW TO SHOOT A LICENSE PLATE WITH A CCTV CAMERA

When your customer asks you to set up a camera to grab a shot of a license plate on a car, here are a few things you will want to know.

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license plate camera reading license plates

April 5, 2008

HOW TO MAKE MAXIMUM USE OF YOUR VIDEO SIGNAL

The Vertical Interval (V.I.) is the part of the video signal that tells the monitor to start drawing a new screen. It is made up of special SYNCHRONIZATION pulses with no picture elements. This part of the video allows special command and control signals to

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remote control vertical interal video cable control

April 4, 2008

FM MULTIPLEXING WHY, WHEN AND HOW TO USE IT.

First of all, what are the advantages of FM Multiplexing over SSBSC? As with all comparative discussions, we must put equal constraints upon the processes to be compared. In this case, we constrain power density but require greater Signal-to-Noise Ratio (SNR) than the available power

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fm modulation fm multiplexing fm radio modulator scpc modulator

April 2, 2008

WHY CATV CABLE DOES NOT WORK ON CCTV SYSTEMS

When pricing out the cable to use to build a Closed Circuit Television System (CCTV) to connect cameras to a central monitor location, many system operators are seduced by the much cheaper price of CATV cable. After all the specs quoted about the transmission at,

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cable equalization cable equalizer cable slope loss

April 2, 2008

WHAT IS RETURN LOSS, AND WHY SHOULD I MEASURE IT

Once upon a time, "Return Loss" was a somewhat arcane term and used mainly with regard to high frequency transmission lines and the impedance transformations that could be the result of these reflected signals. Now however, with the advent of high speed Data transmission such

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cable slope loss reflections return loss

March 30, 2008

CCTV CAMERAS AND THE POLARIZING FILTER

Have you ever installed a CCTV camera that had a glaring “hot spot” or bright white area on the monitor, and around that bright spot the picture seemed to be out of focus or blurry, with poor picture detail? Or perhaps you had a camera

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polarizing camera lens polarizing film polarizing filters

February 5, 2008

A/B SWITCHING IN A DIGITAL WORLD

The word digital seems to carry with it an aura of invincibility, the thinking of the day is, if it’s digital it must be perfect. This type of thinking can give an engineer a false since of security. If all the equipment used in the

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a/b switch digital a/b switch video loss

February 1, 2008

ALIGNING A CCTV TWISTED PAIR SYSTEM FOR MAXIMUM PERFORMANCE A PROPOSAL TO ESTABLISH A SYSTEM QUALITY MEASUREMENT STANDARD

This article defines a procedure that enables a CCTV installer to obtain the best possible picture that any given Camera can send over Twisted Pair wires to any given Monitor. When the Camera and Monitor are connected together "on the Bench" with short wires, what

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cable loss utp twisted pair video

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