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Bat detector calibration

Subject: Bat detector calibration
From: "Peter Shute" pshute2
Date: Wed Mar 16, 2016 6:20 pm ((PDT))
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 or 5, an=
d I'd like to check the existing marks.

I've tried generating high frequency test tones in Audacity on a PC, but th=
e 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 earph=
ones 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 20=
kHz out of it. It's dated 2001, so I'm wondering if it was designed for com=
puters that had a built in piezo speaker it could drive directly.

Any ideas?

Peter Shute

"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.

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