[microsound] Zoom H4 tech query -- anybody else?

[l at sergivalverde.net]

john,

Are you using H4´s phantom power?

With the H4, it´s known that recording in a very quite place in 24bits
WITH PHANTOM power, causes a similar sound. The problem disapears with
external phantom or a battery mic.

saludos,
s

>
> Hi
>       The H2 is similar when used as a usb audio device. Perhaps try a
> different memory card. The periodic noise could be related to the H4s
> write/card interface. A phone or computer close to the recorder may
> also cause interference. Confirm the interference isnt acoustic born
> by recording with a different brand of recorder. Ive noticed with some
> mics if the connection from the backplate to the FET has solder flux /
> in general isnt clean the FET will produce broad spectral 'pops'. Do
> you notice the low freq interference in all locations ?
>
> -Mike
>
>
>
> On Apr 6, 2009, at 4:58, John Hopkins <jhopkins at tech-no-mad.net> wrote:
>
>> Hey folks -- I've been using a zoom H4 for a couple years now, and
>> have
>> been suspicious how a non-mechanical recording device -- in a really
>> quiet place (for example the Sonoran desert of western Arizona) -- and
>> the wave form of a short recording of a passel of birds in a mesquite
>> tree at dusk shows a cyclic 3-sec repeating pattern which seems to be
>> very low frequency something (sorry, don't have a spectral freq
>> analyzer
>> on my machine).  I uploaded a screen shot of the waveform and a wav
>> copy
>> of the file -- any feedback?  Has anyone else experienced this with
>> the
>> H4?  I've seen it before on the files when recording in really quiet
>> places, and of course I suppose the best solution is probably a few
>> thousands spent in better field recording equipment, to be sure,
>> but...
>>  what could be the cause?     In this instance I was not hand holding
>> it, it was on the ground in a stable place, and essentially no wind.
>> There is also a higher-pitched whine as well, faugh!
>>
>> the sound file: http://neoscenes.net/09-03-092_birds.wav and a screen
>> shot of the file in Peak showing the approximately 3-second repeating
>> patterns http://neoscenes.net/09-03-092_birds.jpg
>>
>> cheers,
>> John
>>
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