cketmail.com
Date: Thu Jun 16, 2011 5:48 am ((PDT))
Hello,
I have used this exel
http://graffiti.virgin.net/ljmayes.mal/var/parabola.htm
after computation you make your elements in hard papel, you connect the ele=
ments toghether with tesa film you chose a place with sand and you put the =
paper parabola sustained by the sand. After that you make with water and cl=
ay a soup, you put the soup in the parabola for one day. With a knife and s=
and paper you makes a good mold. After that you puts the fiber glass, two t=
imes at least but you can make the parabola as thik as you like it.
Good job,
Best regards,
Jos=E9
--- In Peter Shute <> wrote:
>
> You made your own dish? Can you share construction details? How did you d=
esign and make the mould? How thick did you make the dish?
>
> Peter Shute
>
>
> --------------------------
> Sent using BlackBerry
>
> ________________________________
> From:
> To:
> Sent: Thu Jun 16 21:45:30 2011
> Subject: Re: [Nature Recordists] parabolic mics
>
>
>
> Hello,
> I hope this will help
> http://soundcloud.com/freitojos/ms-stereo-the-first-3-5
>
> I put ms mkh 30/40 in a fiber glass 65cm parabola that I made and the foc=
us of the parabola was the line in the limit of the parabola not inside the=
parabola, in the limit.
> Best regards,
> Jos=C3=A9
> --- In <naturerecordists%40yahoogr=
oups.com>, "diesel33dsl" <dieselmil@> wrote:
> >
> > Thanks all dudes!
> >
> > Most of your answers can be synthesized with a 'try it and see' basis.
> > Thats what I'll be doing then, once I have gear and mikes enough to mak=
e comparisons (and software and measurement tools too, we could give some w=
ords here also about what tools you use).
> >
> > It is a pleasure to read your debates and opinions, specially now I am =
starting to take it seriously.
> >
> > About using parabolas, i guess my decision is to gather some coins and =
try to ask one of those swedish to send me a telinga set :)
> >
> > Positioning a shotgun mic in a parabola seems quite an unexpected go si=
nce I'd be combining two different caption ideas (thanks David B.) and prob=
ably locating the capsule in the focus is not easy due to mike size and so =
on... I guess the same happens when trying to locate there two isolated mic=
s for a stereo take of a distant element.
> >
> > Thanks Raimund also, your Goshawk take makes worth the try with my appr=
oach.
> >
> > What's clear is that small/light mikes will fit best there and omnis po=
inting to reflected sound are best choice...
> > i guess the Telinga sets include good mikes on them, specially designed=
for better performance, but has anyone of you got better results by swappi=
ng default Telinga mikes with others?
> > Or, is my choice to get a Telinga set (dish, handle, mount) without mik=
es and put some specific models there?
> > Which models/brands go well here?
> >
> > Thanks!
> >
> > --- In <naturerecordists%40yahoo=
groups.com>, "Avocet" <brini@> wrote:
> > >
> > > > Question 2:
> > > Is the parabola approach designed to be used with JUST omni mics?
> > > Are other caption patterns allowed, or is it senseless to use
> > > directional mics here?
> > >
> > > Dani,
> > >
> > > As a supplementary answer, try any mic with a parabola and see what i=
t
> > > does. However, bear in mind that a double mic or a gunmic will be
> > > wider or longer than the high frequency focus of the parabola so the
> > > basic parabola theory won't apply.
> > >
> > > > Does this enhance directivity for a shotgun?
> > >
> > > You would be combining two very different directional principles and
> > > it is unlikely that they would reinforce each other's characteristics
> > > but try it. And it is likely that they would reinforce each other's
> > > disadvantages.
> > >
> > > BTW I regard the MKH 416 one of the most useful mics available and
> > > can't see how it can be improved on except for the MKH 816 (still
> > > available second hand). If you have a bottomless pocket there is the
> > > MKH 8070 which has an amazing spec but I can't afford two of them for
> > > stereo. :-) I think the law of diminishing returns would act here,
> > > money-wise.
> > >
> > > Going to basic parabola theory:
> > >
> > > a) The focus is finer at higher frequencies and virtually non-existan=
t
> > > at low freqencies.
> > >
> > > b) An omni mic will pick up both direct sound and reflected sound and
> > > at some frequenies these will tend to cancel out, but for most wanted
> > > frequencies the reflected sound swamps the direct.
> > >
> > > c) A cardioid theoretically avoids cancellation effect type b) but
> > > other diffraction effects still apply. A cardioid is always more
> > > susceptible to wind and handling noise. Take your pick on
> > > disadvantages.
> > >
> > > d) Stereo with a parabola is only possible using two points just
> > > off-focus on either side. The theory behind this is complex so trial
> > > and error is the best method of finding out what works.
> > >
> > > David
> > >
> > > David Brinicombe
> > > North Devon, UK
> > > Cogito cogito ergo cogito sum - Ambrose Bierce
> > >
> >
>
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