Hydrophone Question

Lost At Sea · 03-19-19, 03:39 AM

Hopefully one of you can throw me a bone as I am having difficulties with the hydrophone station and GAIN / HIGH PASS / LOW PASS

I probably understand GAIN in theory, something like the input "volume".
But what about High Pass & Low Pass? What are those for?
I mess around quite a bit with these 2 knobs - somehow searching for a sweet spot - but quite often it goes from near silence to loud overloaded "statics" (for lack of a better term) while not having moved the needle.

Are High & Low Passes related to the type of ship tracked? Low Pass for freighters and such with Low pitch screws and High Pass for warships spinning screws at much higher rev?

Now and then I manage to get brilliantly clear sounds off the station.
Unfortunately 100% unintentional, and always hard to repeat.

Cheers,
Lost

03-19-19, 03:39 AM	#1
Lost At Sea Electrician's Mate Join Date: May 2004 Posts: 136 Downloads: 94 Uploads: 0	Hydrophone Question Hopefully one of you can throw me a bone as I am having difficulties with the hydrophone station and GAIN / HIGH PASS / LOW PASS I probably understand GAIN in theory, something like the input "volume". But what about High Pass & Low Pass? What are those for? I mess around quite a bit with these 2 knobs - somehow searching for a sweet spot - but quite often it goes from near silence to loud overloaded "statics" (for lack of a better term) while not having moved the needle. Are High & Low Passes related to the type of ship tracked? Low Pass for freighters and such with Low pitch screws and High Pass for warships spinning screws at much higher rev? Now and then I manage to get brilliantly clear sounds off the station. Unfortunately 100% unintentional, and always hard to repeat. Cheers, Lost