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Top2. Background And Fitting The Data
The cable and test parameters that were assigned to search for an unifying relation are shown in Figure 1.
Figure 1. Cable (a) and test (b) parameters selected to the relationship search
The attenuation was selected as the main parameter that should be kept and should be related with other design and test parameters. The general searching dependence reads:
(1) where
dcu is the copper wire diameter, mm;
dins diameter of the insulator, mm; δ
Al is the aluminum thickness, μm;
I – impedance value required in the cable testing, Ohm ;
F – the frequency assigned for the cable test, MHz, ;
p – cable lay length, mm;
A – attenuation, dB per 100 m of the cable.
The data that connects parameters in Equation (1) were assembled in production line of Teldor Cables and System Ltd. (Attachment 1) for cables designed from four individually foil-shielded twisted pairs with tinned copper drain conductor, and overall braid-shielded and jacketed.