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[PSUBS-MAILIST] RE: Hydrophones



Jim,
 
     Lets ask Jens Laland! He seems to know this kind of stuff. I had a BQS-04 on my boat.
Something to make note of...
 
   BQS-* usually indicates "send".. that's what the "s" designates.
 
   BQR-* usually designates "receive of listen" that's what the "r" designates.
 
   The BQR-2 system was the system prior to the BQR-21 which my sub was equipped with and may be a stave (a stack of one or more passive hydrophones arranged in a single row.) In other words it may not be designed for active transmissions at all. You have a gem there so be sure what it was designed for before damaging it.
 
   Jens, help us out here...
 
                                                                                      David Bartsch
 
> Date: Mon, 18 Jan 2010 07:19:42 -0800
> Subject: Hydrophones
> From: jimrudholm@gmail.com
> To: dbartsch2236@hotmail.com
>
> Hello,
> I have enjoyed your posts on the Psubs site and Doug and Kay's site.
>
> I have several hydrophones that were identified from BQR-2a sonars but
> cannot verify that. They are 45.5" long, the rubber body 1.875" in
> diameter, and 14.5 pounds. They are supposed to have a stack of barium
> titanate cylinders about 1.5" long and about 1/8" wall thickness for
> the active elements. I bought some of these cylinders years ago from a
> surplus electronics store. The hydrophones were purchased probably
> back in the 60s from DOD surplus at Rough and Ready Island near
> Stockton, CA.
>
> Attached is a pic.
>
> I would like to test them before offering them to the Psub community.
> I have a HP 204C oscillator and 403B voltmeter. Any suggestions for a
> test schematic?
>
> Thanks,
>
> Jim Rudholm


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