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Re: Humpback talk

Subject: Re: Humpback talk
From: "Robb Nichols" robb_nichols
Date: Wed Mar 17, 2010 5:45 pm ((PDT))
The problem with whales is that they're always hanging out in the most
inconvenient locations!  But I think that you're on to something.  The
cable vibration dampener / sinker is one of those products that I've had
in mind for many years, but it is a little hard to pencil out when
electrical-taping a banana weight from the local fishing tackle store
kind of does the same thing.  You'll need to experiment with what works
best with your rig in your location, but perhaps start with a four to
six-ounce weight taped to the cable about a foot above the hydrophone.
If that is not enough mass to keep it down, I'd try a second weight
somewhere near the middle of the cable.

Your hydrophone actually has a very high specific gravity, but its small
size limits it mass and cable drag wins out in any significant current.

Regards, Robb

On 3/15/2010 3:42 PM, Kawika wrote:
>
>
> Robb and other hydrophonists,
> I went out yesterday to record from kayak, got some good stuff, but
> more improvements in technique needed. Though we were drifting only
> about one-to-two knots, the phones were streaming behind almost flat,
> so I get a lot of surface noise of wind and wave, and also less stereo
> image. I'm considering attaching lead weights to the cables just above
> the phones, maybe hydrodynamic lead fishing weights, to keep them more
> vertical. Might this help?
>
> David
>
>






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