Patent ID: 6965756
Filing Date: 2005-11-15
Classification: H04B

Abstract:
1. A method of testing the operability of a communication apparatus having a transmitter section that is adapted to output a communication signal at a first frequency for application to a diplexer and transmission to another communication device, and a receiver section that is coupled to said diplexer and is adapted to receive a communication signal from said another communication device at a second frequency, different from said first frequency said method comprising the steps of: (a) providing an auxiliary communication device having a frequency generator that is operative to generate an auxiliary frequency signal having a frequency on the order of the sum or difference between said first and second frequencies, and a frequency combiner, coupled to said frequency generator and to an input/output terminal of said auxiliary communication device, and being operative to combine said auxiliary frequency signal with an external signal coupled to said input/output terminal and to produce at said input/output terminal an output frequency corresponding to the sum or difference between said auxiliary frequency and the frequency of said external signal; and (b) coupling said input/output terminal of said auxiliary communication device to said diplexer, and monitoring said receiver section of said communication apparatus for said second frequency.