On Sat, 13 May 2006 12:07:39 -0400, axolotl
wrote:

Don Foreman wrote:

The wavelength of 22 KHz ultrasound is slightly shorter than Ka band
microwave,

Umm...?

Kevin Gallimore

Um what, Kevin? Speed of sound in air is about 1100 ft/sec, speed
of em radiation is 3*10^8 meters/sec. Downlink part of Ka band is
about 18 GHz, lambda is about 1.67 cm. Lambda of 22000 Hz sound in
air is about 1.52 cm.

DirecTV is in Ku band between 12.2 to 12.7 Ghz, lambda is about 2.4
cm.

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