# Author: fmsystems

### Decibel Conversion Table

This is a table for decimal conversion.

### 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 itâ€™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

### De-Emphasis Response Table (75us, 25us, J-17)

The reason for Pre/De-emphasis in FM modulated transmission systems.

### 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

### GETTING THE HIGHEST PERFORMANCE FOR YOUR CCTV SYSTEM DOLLAR

Getting more performance on a CCTV system usually involves at least two different parameters and usually two are at odds to each other, the more of one, the less of the other. The two parameters in this case are PICTURE QUALITY and DISTANCE between the

### Narrow Band Frequency Assignment Chart

This is a frequency assignment chart for Audio Subcarriers.

### CARSON’S RULE Calculating FM Modulation Bandwidth

CARSON'S RULE: 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.

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

This graph illustrates the picture quality obtained when sending a CCTV picture through various lengths of RG59/U cable and the restoration of picture quality obtained by using the ACE472 at the monitor end of the system.

### 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

### WHAT CAUSES CCTV GROUND LOOP PROBLEMS AND HOW TO FIX THEM

The annoying horizontal bars that occasionally show up in CCTV video monitors are the result of load unbalance in 60 cycle power distribution in the vicinity of a particular CCTV system. As such they may exist in one CCTV installation, but not in another essentially