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Old 01-14-2010, 1:39 AM
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gmclam gmclam is offline
Join Date: Sep 2006
Location: Fair Oaks, CA
Posts: 5,314
Lightbulb Power

Line of sight is a critical factor. I understand that only 1 watt of power was used to communicate with spaceships at the moon. But 1 watt down in a canyon has no where to go.

Another thing to consider is "antenna pattern". Is the transmitted beam being sent omni-directional? Or focused in a specific direction?

There is also atmospheric conditions. Some amateur radio operators are able to "talk around the world" via skip or similar means with very little power. As a matter of fact there is a forum here on that topic where people post distant police/etc calls they've received.

Power is over-rated.
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