Richard Clark wrote:

On Mon, 26 Mar 2007 04:27:01 GMT, "David Hooker"
wrote:


Ahhh. OK, if I can legally call this a "radiodetermination
transmitter" then I can use up to 25W (!) at 7.6-7.7GHz; otherwise the
highest frequency I can use is 2.4-2.425GHz at 100mW.

But if I'm in a carpark and I'm using such a high frequency (please
excuse me, I'm a novice) but wouldn't I have trouble with reflections

from the metal of the cars and concrete around me?

Hi David,

100 mW in the 2M region is enough power to communicate with the space
shuttle. You are not lacking for power, you are lacking for scale.
Your inspiration of 7+ Ghz comes close enough to be achievable (and
using Gunn Diodes as transmission sources). However, scale will still
make the product about as long as a pencil, or the entire structure
the size of a business card. Not quite the key fob, but closer.

73's
Richard Clark, KB7QHC

You could always use a fractal antenna! :-)

Irv VE6BP