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System for testing signal transmission/reception apparatus

  • US 6,005,891 A
  • Filed: 08/13/1996
  • Issued: 12/21/1999
  • Est. Priority Date: 08/13/1996
  • Status: Expired due to Fees
First Claim
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1. A system for testing signal transmission apparatus comprisinga signal transmission means to be tested,a source of a pseudo-noise test signal coupled to said signal transmission means,means for adjusting the frequency of said test signal prior to its being fed into said signal transmission means,means coupled to said signal transmission means for receiving a reflected portion of said test signal reflected from said signal transmission means,a circuit module having an input terminal at which an oscillator sine wave is received, said circuit module having first and second output terminals at the first of which said sine wave is present and at the second of which the quadrature of said sine wave is present,a demodulator module to which said reflected test signal is coupled and to which said output terminals of said circuit module are separately connectible whereby a first demodulation operation takes place with said reflected signal and said sine wave and a second demodulation operation takes place with said reflected signal and the quadrature of said sine wave,each demodulation operation producing analog signals representative of the condition of said signal transmission means,an analog to digital converter receiving said analog signals and converting them to digital signals, andcorrelation means receiving said digital signals and comparing them with a table of values representing normal operation of said signal transmission means.

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