Originally posted by
auv-ee
A piezo transducer, coupled to water, has a Q of about 3 to 5, which is not really narrow enough to control the frequency within +/-2.7%, as called for by the spec. Thus there must be one or more time bases to generate the 37.5kHz, 10ms and 1second timing.
Ok. We've done this to death, and I suspect you are right with one or two earlier stages to improve the Q. But it potentially shows that with the loose spec, that the likelihood of two pingers on the same aircraft chirping at the same frequency is almost zero.
mm43