Sorry, I just answered the question. Maybe better to confer with the
Dad of Telinga.
--- In Walter Knapp <>
wrote:
> Rich Peet wrote:
> > Well, it is because it doesn't.
> > The Telinga is a hybred shape and not a pure parabolic.
> > By changing the shape off a parabolic the abrupt shelf is
minimized
> > and gain starts to drop off as high as 2200 cycles.
> > The downside is that you don't get full gain all the way down to
what
> > you would expect on a 20". It is a trade off some like. Go
measure
> > the outside of your dish.
>
> Well, except I don't get that dropoff either. That would be even
more
> obvious recording frogs. Not there either.
>
> And you will have to find what's wrong with my old homemade. It
also
> went down to 50hz.
>
> And someone recently sent me a recording made using a TV satellite
> antenna dish. It also was picking up all the way down.
>
> I suppose I'll have to see if the 30" has a sharp dropoff.
Precisely at
> 30" wavelength. Of course first I should get out my micrometer and
make
> sure it's a parabolic.
>
> Walt
>
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