Hi,
I use an Ultramic 200k. I originally purchased it to look for ultrasounds =
in various terrestrial mammals, but I'm having a lot of fun setting it up a=
nd recording in my backyard or while out camping. I have been recording a =
number of katydids in southern Arizona (19-55kHz), so I am very interested =
in Alan's work. I use Audacity to examine the power spectra and the spectr=
ograms.
The ultramic is pretty quiet, but can be a little difficult to get the sett=
ings just right. I'm currently using it with an Acer Iconia W500 tablet, a=
nd it seems to pick up a bit of noise from the tablet, including a very lou=
d, low frequency (up to 500 Hz) noise. I don't think I will use this setup=
for any soundscape work, but it is a great tool for the ultrasounds.
You can hear some of the recordings on my blog: www.wildmountainechoes.com.=
They've been time-expanded, amplified and subject to high and low pass fi=
ltering.
Chris Hass
--- In "Raimund" <> wrot=
e:
>
> > Mics that handle bat frequenies are either hissy or expensive, and
> > many bat detectors introduce spurious frequencies, including
> > subharmonics. Thus you can often pick up 110KHz Lesser Horseshoes at
> > an HD setting of 55KHz.
>
> David,
>
> While it is a good habit to care about potential quirks of the equipment,=
I think in this particular case the 55 kHz signal component is really emit=
ted by the bats themselves.
>
> Actually, the fundamental frequency of the Lesser Horseshoes Bat echoloca=
tion calls is 55 kHz! The most intense component is however the second harm=
onic at 110 kHz. This is common in many horsehose bat species.
>
> See also this paper on the greater horseshoe bat:
>
> http://www.google.de/url?sa=3Dt&rct=3Dj&q=3D&esrc=3Ds&frm=3D1&source=3Dwe=
b&cd=3D6&cad=3Drja&sqi=3D2&ved=3D0CHAQFjAF&url=3Dhttp%3A%2F%2Fwww.ivb.cz%2F=
folia%2F56%2F2%2F126-136_MS1192.pdf&ei=3DT0evUIyKDcnNtAaH5ICwAg&usg=3DAFQjC=
NESEWF5pY9lutE02VV2WmDAstbHUg&sig2=3DbVNiFN4o2V6Odc_PE3Zwbw
>
> Regards,
> Raimund
>
"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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