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Re: Physics of moisture-induced mic noise

Subject: Re: Physics of moisture-induced mic noise
From: "vickipowys" vpowys
Date: Mon Jan 4, 2010 1:06 pm ((PST))
Adding to Scott's list:

Mics: Sony ECM-MS5 one point stereo mic inside home-made blimp
Noise event: hissing and spluttering
Conditions: hot and steamy, northern Australia
Time: early morning
Age of mic: fairly new
Notes: mic recovered when it was dried out/ left in the sun

Mics: 1 of 2 Sennheiser ME64s AA battery powered, inside home-made blimp
Noise event: hissing and spluttering
Conditions: humid summer nights
Time: overnight and early a.m.
Age of mic: uncertain
Note: only happened with one mic, and when I swapped to another K6
power unit the mic worked fine.  So the fault was with the power unit
and not the mic.

Mics: 1 of 2 Sennheiser MKH 20s in SASS unit
Noise event: infrequent loud hissing
Conditions: not especially humid
Time: anytime
Age of mic: brand new!
Note: the mic was repaired by Sennheiser, I think they replaced a
capacitor.

Mics: 2 Pearlcorder lavalier electret mics
Noise event: none
Conditions: humid, tropical Australia

Mics: Telinga LS-10 one-point stereo mic used open with additional
polar-fleece windcover.
Noise event: none
Conditions: left outdoors under cover on humid summer nights, light
rain blowing in on mic
Time: overnight and early a.m.
Age of mic: new


Vicki Powys
Australia



On 05/01/2010, at 4:10 AM, Scott Fraser wrote:

> <<My advice is for those of us who have had these problems is to put
> together a database of the model of mics, noise events, conditions,
> time, age of mic, etc., to see if there is any type of correlation
> that can be gleaned form this data. Perhaps a pattern will never be
> found. But at least we can perhaps get some idea of what mics have
> what problem under what conditions. Mics that perform well and that
> don't make it to the "event list" would probably be good candidates
> for field work.>>
>
> Good idea.
>
> Mics: (2X) AKG C451/CK1/A51 swivel joints. (Externally polarized
> condenser.) Inside Rycote blimp with fabric cover & furry windshield.
> Noise event: Frequent (several per second) popping.
> Conditions: Tropical rainforest, Costa Rica.
> Time: Daytime.
> Age of mics: Probably at least 12 - 15 years.
>
> The solution:
>
> Mic: AudioTechnica AT825 (Electret) Inside Rycote blimp with fabric
> cover & furry windshield.
> Noise event: None detected.
> Conditions: Tropical rainforest, including several rain events, Costa
> Rica.
> Time: day & night.
> Age of mic: Less than a year.
>
> Additionally:
>
> Mics: Built-in condensers Sony PCM50. (Presumably electrets.) Inside
> Rycote furry windshield.
> Noise event: None detected.
> Conditions: Tropical, hot humid. Bali, Indonesia.
> Time: Day & night.
> Age of mics: Less than a year.
>
> Scott Fraser
>






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