[Lowfer] A little lower than lowfer...

[John Andrews]

Doug,

>Can anyone explain why a 2' dish will not even work well at 50
> Mhz, but does provide gain at the audio frequencies?

The audio application is acoustic. You are creating pressure waves in air
that propagate at 1130 feet per second. A wavelength at 18 kHz is about 3/4
of an inch. So that dish is about 32 wavelengths in diameter.

The 50 MHz application is electromagnetic. You are creating electric and
magnetic fields that propagate at 9.84*10^8 feet per second. The wavelength
is 19.7 feet, and the dish is only 0.1 wavelengths in diameter.

John Andrews