Measuring the Electrical Length of a trans. line

[ohadmos]

Hello

I have a line made out of several components (all quaxial),
I measured its attenuation (-13dB) , and its physical length.
However I must know its electrical length in order to replace it with only one equivalent line.
I need to know it only for a range of 1.9-2.3GHz.

How do i measure the electrical length?
(i can measure frequency response with spectrum analyzer S21)

Thanks in advance.

 

[madengr]

Hook you're signal source (tracking generator if your spectrum analyzer has one), spectrum analyzer, and cable in a T configuration. If the cable is open-ended you're first null in the response is at 1/4 wavelength.