Hi Peter
you could use a waveform generator or a cheap frequency generator like this
one:
http://goo.gl/Hec751
connected to a piezo loudspeaker like this
http://goo.gl/UYgW3F
Ivano
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=
r
> 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:
> http://bertrik.sikken.nl/bat/calibrat.htm
> 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
>
>
--
www.dodotronic.com
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