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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