Thank you for this report, Carter!
Curt Olson
On Jun 22, 2008, at 6:22 AM, wrote:
> 2a. Re: fostex fr-2le high frequency noise
> Posted by: "carterscholz" carterscholz
> Date: Sat Jun 21, 2008 2:15 pm ((PDT))
>
> In case anyone else runs into this problem with the Fostex FR-2LE,
> here is what I've observed since my original post: this high-frequency
> artifact occurs consistently when using the supplied AC power supply,
> when phantom power is turned on. It has not occurred when using fresh
> batteries. I have once encountered a similar, lower-level pulsed tone
> at the end of a long recording when using alkali batteries that were
> running down.
>
>
> --- In Carter Scholz
> <> wrote:
>>
>> Hi,
>>
>> I recently bought a Fostex FR-2LE and I've been making some test
>> recordings with it. I've noticed a steady tone that shows up only
>> when phantom power is turned on. When sampling at 96/24, the tone is
>> on both channels at about 30,700 Hz; with trim and gain up full,
>> using AT 3032s, it is about -66 dB (L channel) and -72dB (R
>> channel). If the internal mics are used, with phantom on, the tone
>> is there, but at a lower level. When sampling at 44/16, the tone is
>> somewhere around 16 kHz, about the same levels. If phantom is turned
>> off, and internal mics used, there is no such noise at any sample
>> rate.
>>
>> I assume this is electrical noise from the switching circuit used to
>> generate the P48. Has anyone else observed it? Is this typical of
>> the Fostex, or do I have a bad unit? And why would it change
>> frequency depending on the sample rate?
>>
>> It's a small amount of noise, but if you shift the 96/24 file down
>> three octaves, it is definitely audible.
>>
>> Carter Scholz
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