Download 06.Broadcasting by John G. Webster (Editor) PDF
By John G. Webster (Editor)
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Extra resources for 06.Broadcasting
Electrical Characteristics of Coaxial Cable Characteristic Impedance. The characteristic impedance of a coaxial transmission line is the ratio of voltage to current on a transmission line when there are no reflections (2) and is defined by the well known equation (3): Z0 = [(R + jωL)/(G + jωC)]1/2 = (L/C)1/2 [(1 + R/ jωL)/(1 + G/ jωC)]1/2 (1) where R, G, L, and C are, respectively, the series resistance, shunt conductance, inductance, and capacitance per unit length. 059551(v) log(do /di ) (3) where L ϭ [ȐȐ0 ln(do /di)]/2ȏ; C ϭ 2ȏ⑀⑀0 /ln(do /di); the permeability of free space (vacuum) Ȑ0 ϭ 4ȏ ϫ 10Ϫ7 H/m (by definition); Ȑ is the relative permeability of conductors, which is Pin Front compression ring Rear compression ring Collet Ferrule O-ring Thrust washer actuator Integral Collet support mandrel Domed insulator Dielectric Center conductor Back nut Outer assembly conductor Insulator Body assembly Main nut assembly Figure 6.
Various methods have been used for this purpose, including notch filter traps, fixed-frequency and frequency-hopping jamming, RF synchronization suppression, and systematic disruption of the baseband scanning waveform. In addition to the jamming or scrambling 667 equipment for each protected channel, software-controlled facilities are provided at the headend to transmit the uniquely addressed authorization codes and descrambling signals and to store billing information. ) Network Management. Network management facilities provided at the headend include picture and waveform monitors, facilities for testing, program routing switches, commercial insertion, redundancy protection, billing, and computer control of addressable authorization.
The basic tree-and-branch architecture of coaxial cable TV networks provides one or more trunk cables (sometimes called ‘‘express’’ lines) extending radially from the headend (or optical node) with branch lines leading off the main lines. The network operates at nominal 75 ⍀ throughout. No subscribers are connected directly to trunk or express 668 CABLE TELEVISION SYSTEMS cables. Depending on the length of the trunk cable, a series string, or cascade of trunk amplifiers, sometimes called trunk repeaters, is generally required to offset frequency-dependent cable losses, as well as various frequency-independent losses.