... fixing), etc. network parameters, suitable for measurement of standing wave ratio of cable, antenna and transmission line, etc. in field, as well as ... name, and both are used for measurement of transmission line. TDR sends excitation signal of DC pulse which can be used to measure ... *108*Vp / (F2-F1)In which, Vp is the transmission factor of device under test, F1 is the start frequency, and F2 ...