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Re: Bat detector calibration

Subject: Re: Bat detector calibration
From: "Ivano Pelicella" ipelicella
Date: Thu Mar 17, 2016 1:20 am ((PDT))
Hi Peter
you could use a waveform generator or a cheap frequency generator like this
connected to a piezo loudspeaker like this


2016-03-17 2:20 GMT+01:00 Peter Shute  [naturerecordists] =

> Can anyone suggest a good way to calibrate a heterodyne bat detector?
> Mine's only calibrated in 20kHz increments, and I'd prefer if it was 10 o=
> 5, and I'd like to check the existing marks.
> I've tried generating high frequency test tones in Audacity on a PC, but
> the system doesn't seem to be able to reproduce them over about 20kHz. I
> don't know if the limitation is the soundcard or the speakers. I've tried
> earphones instead of the speakers, in the hope that a small driver can go
> higher, without much improvement, so I suspect it's the sound card.
> Is there a trick that can make this work?
> I also tried the usonic program mentioned here:
> It claims to be able to do 10-100kHz, but I wasn't able to get much over
> 20kHz out of it. It's dated 2001, so I'm wondering if it was designed for
> computers that had a built in piezo speaker it could drive directly.
> Any ideas?
> Peter Shute


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