Re: low-cost hydrophones suggestions

[gene daniels <>]

TRY MINEROFF ELECTRONICS.

I'm using a Mineroff with Marantz PMD 620 then Raven software with Orca on Haro Strait for 2 seasons.

Also use a Sennheiser tube mic for winter's bird recording in SW. The cheap one. Recording lawn sprinklers at 1 mile distant is not required.

From a Wenonah Solstice Titan, 10 foot wire. The Mineroff preamp powers off the PMD.

I could use a 12v to 5 volt convertor, please advise.

I communicate with the pod, longest observed range prob one mile from off Bailer's Hill, San Juan Island, to Orca near the border

Raven then boosts amplitude AND filters noise.

A RadioShack voice recorder matches notes to hydrophone recording. A Seagate Free Agent 500 GB stores data.

Figure that is a basic system use able for serious research.

Calibrate with Raven for field work ?

Sonic Eletronix has Omega alarm system door sensors on sale for $10.

Parts are available at:

http://www.allelectronics.com/

A workable english academic based hydrophone schematic is online ? I will send later.

http://books.google.com/books?id=6pFzQC2ykBkC&printsec=frontcover&dq=marine+bioacoustics&hl=en&sa=X&ei=2DR_T-iLL4nZiQKdgfHFAw&ved=0CDIQ6AEwAA#v=onepage&q=marine%20bioacoustics&f=false thr

I bought the Mineroff as a requested project from Saul Mineroff. Saul matched the Mineroff to the PMD. Excellent. But the system needs a 12v to 5V for waterproof kayak use. 12V deep cycle trailer batteries are available from Summit Racing online.

Changing batteries while upside down...

Mineroff offers a seperate Preamp for recording bacteria.

Raven software is excellent with backup. Visit the site at Cornell Bioacousitcs.

Gene Daniels