Apparatus for generating signals useful for testing the sensitivity of microwave receiving equipment

An apparatus for generating a test signal for evaluating the sensitivity of receiving equipment comprising:

• a noise source for generating a first noise signal having undetermined power level;
• amplifier means for amplification of the power level of said noise signal and an attenuator means, for adjustment of the power level of said noise signal to a predetermined power level, connected in series between the noise source and a first splitter means;
• the first splitter means connected to the output of the series connected amplifier means and attenuator means for splitting said first noise signal into second and third noise signals;
• first power level monitoring means connected to the output of said first splitter means having said second noise signal output therefrom for monitoring the power level of said second noise signal;
• input means for receiving a first carrier signal having a predetermined power level;
• second splitter means connected to said input means for splitting said first carrier signal into second and third carrier signals;
• second power level monitoring means connected to the output of said second splitter means having said second carrier signal output therefrom for monitoring the power level of said second carrier signal;
• and
• combiner means connected to the outputs of said first and second splitter means having said third noise signal and said third carrier signal output therefrom, respectively, for combining these signals and outputting a combined signal indicative of said third noise signal and said third carrier signal.