GENERATES FM STIMULI USED TO MODULATE THE RF SELF TEST GENERATOR ON THE BITE RF MODULE; PROVIDES THE CAPABILITY TO EVALUATE THE QUALITY OF THE BASEBAND OUTPUTS BY PERFORMING SIGNAL TO NOISE MEASUREMENTS ON THE INDIVIDUAL RECEIVER MODULES; GENERATES SONOBUOY TEST PATTERN SIGNALS FOR PERFORMING END TO END TESTING OF THE AIRCRAFT ACOUSTIC SYSTEM; USED FOR INTERNAL BIT FUNCTIONS ONLY