Originally posted by
auv-ee ...
The spec sheet (
Dukane model DK120 and DK100 Underwater acoustic locating beacons) shows a different tolerance for the frequency (1kHz/37.5kHz =2.7%) than for the pulse width and repetition rate, each at 10% (each listed as 9ms and 0.9sec from a likely, but unstated, nominal of 10ms and 1 sec, respectively). This means that they are not derived from the same time base.
I think they are effectively quoting from the TSO C121 spec. The following snippet from their manual would indicate something different:-
It appears the 37.5kHz piezo-ceramic transducer looks after itself, and the only requirement is for the 10msec duration switching pulse every second, and that would be derived from a separate time base.
Note the 1800 - 3600m detection range. That would imply that in deeper water, the Emeraude would need to go deep[?] to stand a chance of detecting a signal, whereas the Towed Pinger Locaters are designed to do that.
mm43