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Frank, The sonar equation in saltwater is quite a bit more complicated
both by the background noise you note from biologics (plus surface wind and
maybe rain along with vessel noise) as you note and water chemistry.
Depth and temperature also play into calculating acoustic transmission through
the water. R/Jay Respectfully, Jay K. Jeffries Andros Is., Bahamas As scarce as the truth is, the supply has always been in excess of
the demand. -Josh Billings From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of ShellyDalg@aol.com Hi David. Well, sorry, but the test chamber has been on hold for a
while. I'm going over to the iron shop for pricing on my stainless ballast
tanks this week, and I'll try to get the flanges needed for the window. I want
to be able to video the test with a good view of the unit as the pressure
builds. I have everything for the chamber except the two flanges. Once I get
them, it won't take long to weld it all up. The testing Les did sounds really
good. As for the salt water test, relating to the difference between salt and
fresh, I'd be surprised if the difference was that great. I wonder if part of
the difference was that open salt water has more debris in the water, and any
large body of water like a harbor or ocean or whatever is bound to have a lot
of background noise from things like tiny creatures clacking away, possible
boats within the area, waves slapping against the shore, and generally the
ocean is a pretty noisy place. Sound carries really far through water, and with
Les testing that system in a pond covered with ice ( BRRRRRR!!!) it would have
been a pretty quiet place to test in. I'll get on that chamber, and again,
sorry for the delay. Frank D. A Good Credit Score is 700 or
Above. See
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