The dish is parabolic +/- 10%. The focal distance varies between 125 and 13=
0
mm. This means that the focus is a bit inside the dish. I use that design,
as it allows the use of a fleece windshield cover.
Klas.
At 17:20 2003-03-04 -0500, you wrote:
>Klas:
>
>If you're listening, can you tell me again where the focal point is for yo=
ur
>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 insi=
de
>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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Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
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