1. Telinga focusing - was [Nature Recordists] Re: Telinga Stereo-DAT co

["David Ellsworth" davidells]

At 2007-04-13 13:47, Walter Knapp wrote:
>Another note, you can move the Stereo DAT mic in the focus of the dish
>just like you can with the Dual Science, in fact you should. I set up
>the focus of mine for something calling a hundred yards out most of the
>time. But if you want to be picky you can do it for each caller.
>
>Folks should also realize there are 8 mic elements combined in the
>Stereo DAT. Each channel is a combo of 4, which are not all at the same
>location, so focus is a combo of those.

I did a test using 4 kHz and 8 kHz tones at a distance of 22 feet
(which is at least as close I try to get to birds to get a clear
recording; I often get closer) and it showed only a 1.6 dB difference
between having the mic as far back as possible and moving it to the
optimum position, about 1/2 inch forward. A more distant target would
only move the optimum backwards, so I'm guessing Klas designed it to
be focused at infinity at the furthest-back position.

What position did you find worked best at 100 yards, and how did you
do the calibration?