this is a common problem of that line of microphones. when powered by
internal battery the noise floor increases above 10 kHz and shows strong
peaks above 26 kHz that varies from mic to mic. None of these problems when
powered by Phantom. See at the end of this pages:
http://www.unipv.it/cibra/res_techtest_uk.html
Gianni
2014-10-26 10:41 GMT+01:00 [naturerecordists] =
<
>:
>
>
> Hi Chris,
>
>
> This noise originates from the DC/DC converter of the K6 microphone modul=
e
> that converts the low battery voltage of 1.5 V to the higher supply volta=
ge
> for the internal circuitry. This noise will disappear once you power the =
K6
> module externally by the 48 V phantom power provided by the recorder.
>
>
> I don't see a problem with that noise because it is well outside of the
> sensitive frequency range of the microphone. So, one could simply low-pas=
s
> filter the recordings in order to get rid of that noise.
>
>
> Regards,
>
> Raimund
>
>
>
>
>
--
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universit=C3=A0 degli Studi di Pavia
Via Taramelli 24, 27100 Pavia
http://www.unipv.it/cibra
http://mammiferimarini.unipv.it
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