Rapid method for measurement of cable surface transfer impedance

Abstract

A new simple method for the in situ measurement of the surface transfer impedance of coaxial cables i s described. The method is based on injecting a disturbing current onto the outside of the test cable and measuring the corresponding uoltage induced on the center conductor. It is shown to produce reliable results at frequencies up to 150 MHz with the use of a I-m length of cable. 0 1996 John Mley & Sons, Inc. KEY TERMS Transportable communication device, VCO, feedback Q ABSTRACT Wepresent studies and test results on the mechanism of C / N detenoration of the transmission wave caused by the feedback to the control sections within the same housing. We consider the relatwnship between this deterioration and the Q value of the oscillating circuit of the VCO.We study improvement of the Q value. 0 1996 John Wiley & Sons, Inc.