An S-9 H.F. signal arriving at the input terminals of a shortwave receiver has on the order of 25 PICOWATTS of power. Down at the noise threshold, the signal is on the order of a few dozen FEMTOWATTS.
After half a century I am still intrigued by the fact that you can slosh a few electrons up and down a coat hanger and be heard thousands of miles away. If this still doesn't amaze you, you have no soul.
Eric
After half a century I am still intrigued by the fact that you can slosh a few electrons up and down a coat hanger and be heard thousands of miles away. If this still doesn't amaze you, you have no soul.
Eric