I have had one of these since the 1970s. Built it from plastic
piping, and was never happy with the performance, but it does work.
It was the original shotgun microphone for those with little money.
Mine was originally built for a limited spectrum of sound with quite
a few fewer tubes than the project you plan. They are a fun project
if you want to try one. I'd be interested in how your project turns
out.
--- In "Michael Oates" <>
wrote:
>
> Has anyone every made and used a machine gun microphone. There is
not
> much about these on the internet, but I have found this:
> http://www.reject.org/tsd/liz/gbppr/mil/mic/ShotGunMike.pdf
>
> I am concidering making one using 90 tubes of 8mm diameter
aluminium
> tube with lengths from 1m down to 9mm. (That is two more rings of
> tubes than shown on the example making it 88mm diameter instead of
> 67mm) I was thinking of fitting a Rode NT1A as the condenser mic.
But
> I really want to know if anyone has tried such a beast. Based on
the
> length of tubes I would use, it should work from about 150Hz to
20kHz
> range and appears to be very directional.
>
> My idea of using more tubes that in the example it to fill in the
> gaps in the frequency range, but I don't know if that's needed.
>
> Cost would be about =A3120 for the tubes plus a bit more for for
> fitting some windshield around it with fake fur on a wire frame
> former covering the full length.
>
> Thanks,
>
> Mike
>
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