April 2008

April 11, 2008

WHY YOUR CCTV IMAGES ARE NOT AS SHARP AS THEY SHOULD BE

All cables introduce some loss of picture brightness and clarity. The longer the cable run the greater the loss. The loss of picture clarity is usually more noticeable than the loss of brightness as the cable length between the camera and the monitor becomes greater.

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automatic cable eq cable equalization

April 9, 2008

BRIDGED T PAD ATTENUATOR DESIGN

This is by far the easiest design for a matching impedance pad (either balanced or unbalanced), because it is only necessary to choose the desired voltage reduction ratio and subtract one to determine the factor to be used to compute the remaining resistance values.

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April 9, 2008

VIDEO LUMINANCE MEASUREMENT AND THE I.R.E. FILTER

Color video measured on a wide-band voltage basis like the old black and white TV signal actually measure 1.142857143 Volts peak to peak with maximum color saturation instead of the normal 1 Volt peak-to-peak. If this signal is set to 1 Volt peak-to-peak your actual

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I.R.E. units luminance standard video luminance measurement

April 9, 2008

BESSEL NULL FM DEVIATION MEASUREMENT

The BESSEL NULL FM deviation measurement is an extremely accurate way to obtain a precise deviation setting on any FM modulator operating at any RF frequency. This test requires a Spectrum Analyzer, Sine-Wave Generator, Audio Frequency Counter, and an accurate dBm meter to verify audio

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bessel fuction bessel null fm devation measurement

April 8, 2008

THE “F” CONNECTOR AND THE FUTURE OF SDI-CCTV

What is it that the (CATV) Cable TV Industry knows about connectors that the (CCTV) Closed Circuit TV Industry needs to discover? The answer is the low cost, water tight, easy to install, connector used in the CATV industry. The CATV industry uses the "F"

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bnc connector vs f connector f connector

April 8, 2008

SUBCARIERS IN MICROWAVE AND SATELITE SYSTEMS

In the early days they were called Diplexers, alluding to their main function at that time, to place a second channel (TV audio) onto the same base-band signal as the television video signal for TV studio-to-transmitter (STL) microwave links. After a while, two or more

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microwave subcarriers subcarrier de-modulators subcarrier modulators subcarriers

April 7, 2008

VIDEO FIBER TRANSMISSION PROBLEM SOLVING

Have you ever installed a fiber optic video transmitter / receiver and discovered that you were not getting a good signal output and you knew you were putting in a good video signal but you were not getting the same good signal out. The video

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fiber problems fiber transmission video fiber

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 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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video de-emphasis video filters video pre-emphasis

April 7, 2008

CARSON’S RULE, CALCULATING FM MODULATION BANDWIDTH

A formula is used to determine the RF Bandwidth or occupancy for an FM signal. If you are designing an FM system on microwave or satellite, you will need to take care that your signal does not cross-talk into other signals on the system.

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calculating fm bandwidth CARSON'S RULE fm bandwidth fm modulation

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