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Originally Posted by Letum
It seams that almost all ADSIC was between 16khz and 24khz. Almost never lower
than 4Khz.
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For the given frequency range what practically happens is this:
When the emittion takes place at great distancies (...) you can hear a very weak "click" comming from sonar operator's headphones. From the headphones themselves the sound is clear that it is an emition like I discribed in my previous post. Meanwhile hardly you can hear anything from the CIC. When the contact approaches (...), the sound gets even more clear, also by naked ears inside the CIC and you don't need headsets for that.
Generally speaking if just the sonarman is able to listen the emittions it is unlikely that the sub has been detected except if the sound reaches a "convergence" zone in the water, or a "surface duct" (for bow sonars). But both phenomenas, require medium or low frequency sonars to maintain enough energy along the path and back and certainly it is very difficult for sonars 16-24kHz. So, I believe in SH3 if we make pinging heard only from sonar man this should mean that the submarine is not detected. If someone can hear the pinging from the CIC, then the sub could have been detected or not.
The detection distance of a 16-24kHz sonar has to be very limited because of absorption. It is more likely that ASDIC operated at lower frequencies (10-14kHz,less
seems more logical), but I don't have any input from google!