I hope I am not just talking to myself and bragging to much.
But, I don't and won't take it personal if someone says I blew the
test or if they say the results prove it is a bad design.
I used a spark to test the attenuation of the Shopvac filter element
windscreen as photographed below. The spark from a gas BBQ starter is
a very short duration, very loud signal that extends very high in
frequency.
I first tested by placing one mic in the windscreen and a second
rubber banded to the outside of it. The two mics were possitioned so
that they were the same distance from the spark.
The results look like this:
http://home.comcast.net/~richpeet/shopvac.jpg
I then put both mics directly next to each other outside of the
windscreen so that you could also see how closely matched the mics are.
That result looks like this:
http://home.comcast.net/~richpeet/bare.jpg
I sure would appreciate a comment from anyone because what I think I
see is that the thing works pretty darn good for a windscreen that can
be used in high winds and cost under $20.00.
Rich Peet
--- In "Rich Peet" <> wrote:
>
> FYI and preaching to the choir:
>
> I think I have talked about all of the pieces but it is now put
> together and working in the rain and wind.
>
> 125kb photo download showing setup. Second mic was not used for a
> stereo image this time out, rather it was set at 20 db less volume
> should I be priveledged to have had a bird displaying from on top of
> the mic.
> http://home.comcast.net/~richpeet/Trap.jpg
>
> 500kb audio file. First segment in 30mph gust, second segment is me
> walking up to it in short grass (shorter grass than shown in the
> photo). No edit, micpre gain set at +60db. Original file 24/44.1.
> http://home.comcast.net/~richpeet/Trap.mp3
>
>
> Description:
> Mic tripod - AKG
> Mic's - Audio Technica 3032
> Windscreen - Built from a Shop Vac Filter Element with swim suit
> material as a cover.
> Mic Cables - StarQuad by Connectronics
> Waterproof Case - Military 50 caliber machine gun surplus amo case
> with neutrix connectors attached.
> Recorder SD722
> Battery Sealed Lead Acid 12 volt 7 amp (UPS type battery)
> Additional aluminium heat sink from surplus store.
> battery cable built out of hirose connector and aligator clips. Foam
> rubber pieces to make a firm fit for heat sinking the recorder to the
> case wall.
>
> Discussion:
> Set out the sound trap at dark 4:30. Timed record to capture grouse on
> a lek from 5:30 to 8:30. Winds 10 to 20 mph and gusting to 30mph.
> You have heard me talk about wind whistles from cables now you can
> hear them. I need to find a right angle xlr connector for the mic
> cables to add alittle more room for the recorder but Neutrix ones are
> too wide to plug into the 722 properly. Temp was 34 degrees F and the
> recorder case still felt 34 F after 3 hours of recording.
>
> Next test project is to make current drain observations of the
> recorder in Record , Playback, and waiting for timed record for both
> hdd and cf card.
>
> Rich Peet
> PS the Grouse did not dance in the rain and wind this morning but it
> is still early season.
>
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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