COAXIAL CABLE TRAINING

COAXIAL CABLE  TRAINING

Introduction

Proper and good quality TV signal cannot be delivered to  the customer without  properly designed and executed RF cabling at customer premises. The rule is  therefore to install RF cabling and equipment first time right so that quality to the customer can be ensured, complaints are minimized and repeated visits to the customer by field teams could be eliminated. 

NUMBER OF CHANNELS

ANALOG                                75

DIGITAL                                 75

 

HD CHANNELS                   99

 CALCULATING THE IMPEDENCE OF COAXIAL CABLE

Er =Dielectric Constant

                       Air                          =      1                                       Foam              =      1.5  

                      Polyethylene        =     2.3                                    Teflon             =      2.04

BLACK CABLE RG6

INNER  CONDUCTOR      1.02 mm    0.04016 inch

DIELECTRIC                        4.61 mm    0.1815 inch

SHEILD                                  5.2 mm      0.20473 inch

OUTER DIA                          6.7 mm      0.26378 inch

 BLACK CABLE RG 11

INNER CONDUCTOR   1.56mm        0.06142    inch

DIELECTRIC                    7.15mm         0.2815      inch

SHEILD                              7.56mm        0.29764     inch 

OUTER DIA METER       9.72mm        0.36221    inch

Example

 Z=138/√Er *log D/d

Z= 138/ √1.5 *log 4.61/1.02

Z=138/1.22  *log 4.51961

Z=113.12 *06552

Z=74.12

Attenuator

splitter

Video Amplifier