Abstract: A precision analyzer for the testing of numismatic coins or other metallic articles is disclosed whereby the article to be tested is introduced into the field generated by the inductor of an oscillator and the change in amplitude of the oscillations resulting from the interaction of the field generated and the article to be tested is measured.

Abstract: A system and a method are provided for storing high frequency signals, for example microwave signals, for later reproduction with any desired degree of fidelity. The system and method involve determining a measure of the phase difference between an incoming high frequency signal and a converting signal. The measure of the phase difference consists of a plurality of signals which may change rapidly. The phase difference signals are converted to digital frequencies and may be stored or transmitted in that form. Later, the digital signals may be converted to analog signals (if necessary) and used to control the phase of a signal having the frequency of the converting signal. This process reconstructs the incoming high frequency signal.

Abstract: A system and a method are provided for storing high frequency signals, for example microwave signals, for later reproduction with any desired degree of fidelity. The system and method involve determining a measure of the phase difference between an incoming high frequency signal and a converting signal. The measure of the phase difference consists of a plurality of signals which may change rapidly. The phase difference signals are converted to digital frequencies and may be stored or transmitted in that form. Later, the digital signals may be converted to analog signals (if necessary) and used to control the phase of a signal having the frequency of the converting signal. This process reconstructs the incoming high frequency signal.