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Author Topic: High freq on a Fostex FR2LE  (Read 2095 times)

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Offline refrain

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High freq on a Fostex FR2LE
« on: September 13, 2010, 09:24:19 AM »
Hi,

I don´t know if anyone had this problem, but last week I started up my Fr2le, with a ntg3 mic connected, 48v on, and picked up a very high frequency will monitoring or recording,
changed the trim and rec gain, with no visible result, even the headphone vol, download the files to the computer, and the high freq was there, with lower amplitude but there... tried diferent locations, and it´s still there... changed the mic and still could hear it... does anyone have this problem? something with the preamps? maybe the battery, using a tamiya 7.2,
changed it to 4 sanyo enloop batteries and the same...
Just the previous weekend i had been recording with this setup, and without problems...

CS
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Mics: 2x Oktava MK-012 Card (XY, ORTF), AT BP4025 (STEREO XY), Fel Clippy (omni stereo XLR pair - UK), Immersive Sound Earsights (omni stereo XLR pair - FR), Sony ECM 55B (Lav), 2x JrF Piezo and Hydrophone (UK), Lom Geophone (SLOV), Organic Audio Piezo/hydrophone (IT), DIY piezo mics
Audio Recorders: Sound Devices Mixpre6, Zoom H5
Assorted audio acessories: Motu Ultralite MKIII, Echofire2 interface, Mackie 802 VLZ3 mixer, Rycote BBG, Sennheiser hd25
Audio Monitors: Yamaha HS7, Yamaha MSP5

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Re: High freq on a Fostex FR2LE
« Reply #1 on: September 13, 2010, 09:27:41 AM »
Quote from: refrain on September 13, 2010, 09:24:19 AM
Hi,

I don´t know if anyone had this problem, but last week I started up my Fr2le, with a ntg3 mic connected, 48v on, and picked up a very high frequency will monitoring or recording,
changed the trim and rec gain, with no visible result, even the headphone vol, download the files to the computer, and the high freq was there, with lower amplitude but there... tried diferent locations, and it´s still there... changed the mic and still could hear it... does anyone have this problem? something with the preamps? maybe the battery, using a tamiya 7.2,
changed it to 4 sanyo enloop batteries and the same...
Just the previous weekend i had been recording with this setup, and without problems...

CS

what frequency range and recording at what settings (e.g. 24bit/96k)
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Offline refrain

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Re: High freq on a Fostex FR2LE
« Reply #2 on: September 13, 2010, 04:02:28 PM »
... recording at 24/48 and the high freq appears around 8500hz...
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Mics: 2x Oktava MK-012 Card (XY, ORTF), AT BP4025 (STEREO XY), Fel Clippy (omni stereo XLR pair - UK), Immersive Sound Earsights (omni stereo XLR pair - FR), Sony ECM 55B (Lav), 2x JrF Piezo and Hydrophone (UK), Lom Geophone (SLOV), Organic Audio Piezo/hydrophone (IT), DIY piezo mics
Audio Recorders: Sound Devices Mixpre6, Zoom H5
Assorted audio acessories: Motu Ultralite MKIII, Echofire2 interface, Mackie 802 VLZ3 mixer, Rycote BBG, Sennheiser hd25
Audio Monitors: Yamaha HS7, Yamaha MSP5

Offline rastasean

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Re: High freq on a Fostex FR2LE
« Reply #3 on: September 13, 2010, 07:18:11 PM »
is the sound present when playing back on the device or on your computer?
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Offline refrain

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Re: High freq on a Fostex FR2LE
« Reply #4 on: September 13, 2010, 08:24:22 PM »
...in both, but it shows much less in the file (when you listen to it in the computer - using a pair of yamaha HS50M and a presonus firetudio), shows much more in playback and monitoring the recording in the fostex... the problem is that just last week nothing like this was happening, and I didn't change anything, or even the recorder was exposed to outdoor surroundings...
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Mics: 2x Oktava MK-012 Card (XY, ORTF), AT BP4025 (STEREO XY), Fel Clippy (omni stereo XLR pair - UK), Immersive Sound Earsights (omni stereo XLR pair - FR), Sony ECM 55B (Lav), 2x JrF Piezo and Hydrophone (UK), Lom Geophone (SLOV), Organic Audio Piezo/hydrophone (IT), DIY piezo mics
Audio Recorders: Sound Devices Mixpre6, Zoom H5
Assorted audio acessories: Motu Ultralite MKIII, Echofire2 interface, Mackie 802 VLZ3 mixer, Rycote BBG, Sennheiser hd25
Audio Monitors: Yamaha HS7, Yamaha MSP5

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Re: High freq on a Fostex FR2LE
« Reply #5 on: September 13, 2010, 08:48:25 PM »
and you can recreate it at home? What if you hook up a different set of mics or connect your home stereo to it (or nothing)?
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"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

Offline kleiner Rainer

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Re: High freq on a Fostex FR2LE
« Reply #6 on: September 14, 2010, 03:36:45 PM »
Hi,

what if you switch off phantom power and plug in dynamic mics? The frequency could come from the DC/DC converter for the phantom power, maybe a filter cap is defective.

Greetings,

Rainer
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