Two tone and spurious response (single signal) receiver tests should be performed on EW and radar receivers to evaluate their spurious free dynamic range. | RECEIVER TESTS Two tone and spurious response single signal receiver tests should be performed on EW and radar receivers to evaluate their spurious free dynamic range. A receiver should have three ranges of performance 1 protection from damage 2 degraded performance permitted in the presence of a strong interfering signal s and no degradation when only a strong desired signal is present and 3 full system performance. The original MIL-STD-461A design requirement and its companion MIL-STD-462 test requirement specified four receiver tests. These standards allowed the interfering signal s to be both inband and out of band which is meaningful for design and test of EW receivers however inband testing generally is not meaningful for narrowband communications receivers. These standards were difficult to follow and had to be tailored to properly evaluate the EW and radar system. MIL-STD-461B C still allowed the interfering signal s to be both inband and out of band but deleted the single signal interference test CS08 Conducted Susceptibility test . MIL-STD-461D -462D leave the pass fail criteria entirely up to what is listed in the individual procurement specification. It also places all interfering signals out of band redesignates each test number with a number 100 higher than previously used and combines CS08 as part of CS104. Therefore to provide meaningful tests for EW and radar systems the procurement specification must specify the three ranges of performance mentioned in the beginning of this section and that the tests are to be performed with the interfering signal s both inband and out of band. The four tests are as follows listed in order of likelihood to cause problems Test Name MIL-STD-461A MIL-STD-461D Undesired Single signal interference test CS08 Part of CS104 Desired with undesired two signal interference tests CS04 CS104 Two signal intermodulation test CS03 CS103 Two signal cross modulation test CS05 CS105 The rest of this section explains the application
