What I already have;
Working frequency of the cable = 1.75Khz
Attenuation = 0.40 Np/km
Phase shift = 0.25 rad/km
Sending end voltage = 10V rms
Sending end current = 20mA rms
What I need to determine is the voltage and current in polar form at a particular point down the line, for example 20km.
I've been trying to figure this out for hours but keep coming to a dead end.
The formula I have for the current is;
Ir = Is e^-na
What I can't figure out is, is "n" the legnth? so for this example would it be 20? and "a" is the attenuation which I'm given?
so would this be;
Ir = (20x10-3)e^-(20)(0.40)
This equals a very small number, which is why I'm thinking its incorrect.
Or am I looking at this the complete wrong way? I thought originally I'd need to work out the characteristic impedance Zo but I'm not given the values for R L G and C ?
So yeah! Any help would be greatly appreciated.
Working frequency of the cable = 1.75Khz
Attenuation = 0.40 Np/km
Phase shift = 0.25 rad/km
Sending end voltage = 10V rms
Sending end current = 20mA rms
What I need to determine is the voltage and current in polar form at a particular point down the line, for example 20km.
I've been trying to figure this out for hours but keep coming to a dead end.
The formula I have for the current is;
Ir = Is e^-na
What I can't figure out is, is "n" the legnth? so for this example would it be 20? and "a" is the attenuation which I'm given?
so would this be;
Ir = (20x10-3)e^-(20)(0.40)
This equals a very small number, which is why I'm thinking its incorrect.
Or am I looking at this the complete wrong way? I thought originally I'd need to work out the characteristic impedance Zo but I'm not given the values for R L G and C ?
So yeah! Any help would be greatly appreciated.