[Milsurplus] OT: Microphone Point Source

[Clare Owens]

Hi John,

Of course there is no such thing as an actual "point source" microphone but
if he's trying to sample a sound field with the least disturbance he could
try to use one of the little mic/booms that are part of some phone headsets
that use a tubular "boom" to bring the sound back to the mic.

Most likely the frequency response would not be great and perhaps the
directionality would not be what he wants.

Beside that, for documented  frequency response and pickup pattern he'll
need a high quality electret mic in a mount and there goes his point in
space model.  I could send you a high quality Boundary Mic (look them up -
either omnidirectional or unidirectional) with known characteristics but
that'd be far from a point in space unless he wanted to take it apart and
remove the cartridge and electronic board - that'd be a lot smaller but the
published specs would be somewhat compromised most likely.

Or something like a Shure MX-202 perhaps, but that's also a $200 mic and I
don't have any spares of those.

Clare N2RJB



On Tue, Jul 23, 2013 at 2:42 PM, John Hensley <w5jv at hotmail.com> wrote:

> A school teacher friend (non-ham) asked me if I knew where he could buy or
> getsome small microphones.  When I asked "how small", he said "Ideally they
> wouldbe very very small, almost like the points of a ball point pen".
>  NADA, says I.  Evena cell phone needs a diameter of 3/16 to 1/4".
> But, I know very little about small point source microphones, if such a
> thing exists.
> Has anyone heard differently on this?  He has written a computer program
> and inthat program, the microphones are mathematically seen as points.  I
> did try to bustthe bubble and suggest there was no such thing, but he is
> determined.
> Thanks for any suggestions.  Please send hate mail and Ga Fawrs off the
> list :-) ..
> John W5JV
>
>
>
>
>
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