At first, thank you EEWeb for great coaxial and twisted pair cable impedance calculator.
But can anyone help me with finding a calculator or an equation to calculate the characteristic impedance of twisted quad and twisted star quad, please? I have searched but with no results.
The twisted quad ( + + - - ) and twisted star quad ( + - + - ) would be used to replace one twisted pair, so two conductors are terminated together at both ends of the cable.
Naturally I know that I can measure the C and L, and easily calculate the characteristic impedance from those values, but I have a lot of different (and short length) cable configurations and not all of them physically available when needing to get the information about impedance. So if you know a calculator or equation (maybe there is a correction multiplier that just needs to be applied for the value given by the twisted pair calculator?) I would be very pleased to get that info.
The best solution would give the possibility to take account the differing dielectric constant for the core filler (also circular diameter) made from other material than dielectrics of surrounding four conductors. But this can also be estimated or the same material than conductor insulation can be used for filler.
Timo Kerminen
But can anyone help me with finding a calculator or an equation to calculate the characteristic impedance of twisted quad and twisted star quad, please? I have searched but with no results.
The twisted quad ( + + - - ) and twisted star quad ( + - + - ) would be used to replace one twisted pair, so two conductors are terminated together at both ends of the cable.
Naturally I know that I can measure the C and L, and easily calculate the characteristic impedance from those values, but I have a lot of different (and short length) cable configurations and not all of them physically available when needing to get the information about impedance. So if you know a calculator or equation (maybe there is a correction multiplier that just needs to be applied for the value given by the twisted pair calculator?) I would be very pleased to get that info.
The best solution would give the possibility to take account the differing dielectric constant for the core filler (also circular diameter) made from other material than dielectrics of surrounding four conductors. But this can also be estimated or the same material than conductor insulation can be used for filler.
Timo Kerminen
