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Old 09-11-2014, 11:09 AM
  #10  
VanW
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Join Date: Aug 2009
Posts: 11,687
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The B175C-L means low, the B175C-M = medium. So they will be different freq. Also I am not an expert in this but it looks like for what you want to do you may also need a dual band chirp system instead of or maybe even in addition to the single band. Or at least more than one transducer.
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