[Milsurplus] OT: Microphone Point Source

[J. Forster]

You do see small mikes with tubes on singers and other performers on
televised concerts. However, I think those are hollow tubes, possibly
filled with an open cell foam or something, with the actual microphone
remoted.

The smallest good quality mikes I know of are made by B&K (the
Scandanavian one) They are made w/ SS and teflon or quartz and are the
industry standard. They come in 1", 1/2", and 1/4" as I remember, but
perhaps smaller now. BTW, they are NOT cheap!

-John

=============



> 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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