Well, then maybe that's why I chose to mount my mike elements at 5.5". I
think I asked Klas some time ago and then adjusted my design to be close to
the point of focus.
In the event he does not get back to your by dawn. Point the dish at
the sun and use a small piece of paper to find the focus. The answer
is about 5.5". btw the telinga can set the paper on fire on a sunny
day.
--- In Lang Elliott <>
wrote:
> Klas:
>
> If you're listening, can you tell me again where the focal point is
for your
> current Telinga parabola?
>
> Lang
>
> Mine are set in a bit because that was necessary given the setup I
created.
> However, if I make the receiving tube longer and glue a rubber
gasket inside
> to hold the rear of the mikes firmly, I could certainly extend them
out to
> the edge of the parabola. I'll probably do this for the coming
season.
>
> Lang
>
> Lang Elliott wrote:
> > p.s. I do have the current dish. I thought Klas told me the focal
point is
> > even with the front of the dish, which would be about 6" out. Is
this
> > correct?
>
> I just went and measured, instead of trying to do it from memory,
should
> have done that to start with. I was wrong about the distance. Front
edge
> of my dish is between 6 & 6 1/2" And my stereo mic is set with the
tip
> even with that plane right now, though I usually have the tip a
slight
> bit out. Your photos make the dish look flatter, which is why I
reacted.
> From the photos your mics look closer in than mine. Since I have
> MKH-20's I could estimate how far out your's really were.
>
> > Lang
> >
> > Mine is currently set at about 5.5". Perhaps I should move it out
a bit.
>
> I worked mine out based on listening, it's fairly easy to tell. The
> Perfect distance depends somewhat on just how far away things are.
There
> is a range of a inch or two. I have worked with the tip as far out
as a
> inch or so beyond the dish, and sometimes somewhat inside.
Particularly
> if working fairly close louder stuff I get better sound if I defocus
> slightly.
>
> Depending on just how far in the mic elements are in the foam I
might
> even have the actual mic elements closer than yours.
>
> I think I must have confused the measurement with my 30" dish.
>
> Comes from spending the evening digging the brushes out of my
Ranger's
> alternator, a very annoying task. Otherwise I'd be out on another
frog
> foray now. I'm delayed by a day on account of that. Small lump of
carbon
> not doing it's job suddenly.
>
> Walt
>
>
>
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