[PSUBS-MAILIST] OTS

[Jon Wallace via Personal_Submersibles]

 I believe it's omni-directional, see page 15-16 in the buddy phone document link below.  OTS manuals like the SSB2010 are available online and have detailed information about various factors affecting underwater communication.  Underwater comms are subject to the inverse square law which is the culprit that limits distance.  While the radiation pattern is omni-directional and the signal can bounce around off lots of things to cover a large area, that also becomes the achilles heel of the system because the further the distance that the signal travels, the weaker it becomes.
https://www.oceantechnologysystems.com/wp-content/uploads/2018/06/SSB-2010-1001B-rev-K.pdf



    On Sunday, October 25, 2020, 07:14:05 AM EDT, River Dolfi via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 David,If you look at commercially used underwater acoustic equipment, lots of them incorporate protection for the delicate transducer. The two most common methods I've seen have been a cage welded together from bent stainless steel rod, or a guard made from a thick walled tube of delrin plastic with the transducer inside pointing out the open end.Does anyone know what the beam pattern for the OTS transducers is? I would imagine that it's hemispherical, but the story about losing comms with R300 as it got laterally farther from the boat makes me think that it might be a narrower pattern.
Thanks,
-River J. Dolfi
rdolfi7 at gmail.com


  
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