On 25 Jan 2015 at 09:48 Jim Brown wrote:
There are (at least) three reasons why an array of microphones is a really bad idea. First, really good sounding mics to work with our radios are widely available cheap. Second, a microphone is an electroacoustic device -- it collects sound at a point in space and converts it to voltage. A microphone at a different point in space collects different sound -- there is a difference in time
We've a more familiar radio analog; think of collinear antennas. If the difference in path length between any two and the source is 1/2 wavelength (*sound* travels 1100m/sec at sea level pressure) that pair will have a null at frequencies whose phase on arrival differs by 180 degrees. And that's only one thing we watch out for.
Interesting discussion, if a bit OT. Cortland Richmond KA5S KX3 1475 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
