Postitatud: E Mär 23, 2009 10:29 am
ühendustraadi läbimõõt ei tohiks suurt rolli mängida...
The following formula can be used for calculating the characteristic impedance of the coaxial cable: (formula taken from Reference Data for Radio Engineers book published by Howard W. Sams & Co. 1975, page 24-21)
impedance = (138 / e^(1/2)) * log (D/d)
Where:
* log = logarithm of 10
* d = diameter of center conductor
* D = inner diameter of cable shield
* e = dielectric constant (= 1 for air)
The following formula can be used for calculating the characteristic impedance of the coaxial cable: (formula taken from Reference Data for Radio Engineers book published by Howard W. Sams & Co. 1975, page 24-21)
impedance = (138 / e^(1/2)) * log (D/d)
Where:
* log = logarithm of 10
* d = diameter of center conductor
* D = inner diameter of cable shield
* e = dielectric constant (= 1 for air)