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#5
March 26th 07, 02:01 PM
posted to rec.radio.amateur.antenna
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Best tiny directional antenna to get 500m range with at most100mW at 150MHz?
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 |
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