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Re: Bat detector

Subject: Re: Bat detector
From: "Klas Strandberg" klasstrandberg
Date: Sun Nov 19, 2006 7:45 am ((PST))
Hi Martyn!

I have experimented a bit with it. Compared parabols with cones,
using a 46kHz transducer at ten meters of distance.

I found best performance with a 5 mm electret placed at the narrow
end of a metal cone, about 150 mm long and with an opening about 50
mm. There is a lot of more experimenting to do, though. But parabols
are not needed. Cones or exponential horns is what I should go for.
Why not try a horn made for loudspeakers?


At 05:14 2006-11-19, you wrote:
>Having recorded thousands of birds and animals over 35 years I am now read=
>to enter the wonderful world of bats, which brings me to the question what
>are the best bat detectors out there?
>I often see the plastic things that are touted around the web etc but has
>anyone here any experiences with any of the units? I am looking at the
>Pettersson D1000X Bat detector, I want something of quality and durability=
>after all, you look for the best recorders like the sound devices etc....
>So come on lads and lassies, what ya got? What ya know?
>I am open to abuse :)
>Martyn Stewart
>Bird and Animal Sounds Digitally Recorded at:
>Redmond. Washington. USA
>N47.65543 W121.98428
>Tel: 425-898-0462
>Make every Garden a wildlife Habitat!
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links

Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01

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