Abstract
A frequency-variation method which shows when an impedance is correctly matched to a transmission line is described. The variation with frequency in the sending-end voltage of a transmission line many wavelengths long is reproduced on the screen of a cathode-ray oscilloscope and from the curve it is possible to see whether the standing waves along the line are large or small in amplitude, and how they vary with frequency. A description is given of an apparatus applying the new method to ultra-high frequencies and used in connection with the matching of aerials and filters to a coaxial transmission line. The method has also been used for demonstrating several important transmission line properties and in this connection is useful for educational purposes.
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