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# Generating Power through Induction with a HAM radio Antenna

A

#### Aaron S

Jan 1, 1970
0
Is it possble to use an inductor with a stepdown transformer to generate
power by using the power ouput of a ham radio through it's antenna? My
friend states his antenna is a 40Watt'er. If I can, about how much power
can i expect to gather using a n inductor.

C

#### chuck

Jan 1, 1970
0
Aaron said:
Is it possble to use an inductor with a stepdown transformer to generate
power by using the power ouput of a ham radio through it's antenna? My
friend states his antenna is a 40Watt'er. If I can, about how much power
can i expect to gather using a n inductor.

Well, the transmitter may be 40 watts, but the antenna is usually not
rated that way.

All of the radiated energy can theoretically be recovered from a
transmitting antenna. The problem is how to capture it all. At a
distance, the instrument used to capture radiated energy is another
antenna, and tiny fractions of the radiated power can often be captured
halfway around the globe.

A stepdown transformer will lower the voltage produced at the antenna,
but that really has nothing to do with the amount of radiated energy you
capture.

If you use a simple inductor as an antenna to capture radiated energy,
you will find that it will probably not be possible to situate the
inductor so as to capture very much, since the antenna may be radiating
in many or even all directions! If the inductor gets too close to the
antenna, it will affect the antenna's properties, and that further
complicates the exercise.

Does any of that help?

Chuck

C

#### Charles Schuler

Jan 1, 1970
0
Aaron S said:
Is it possble to use an inductor with a stepdown transformer to generate
power by using the power ouput of a ham radio through it's antenna? My
friend states his antenna is a 40Watt'er. If I can, about how much power
can i expect to gather using a n inductor.

Any large antenna can gather enough energy to run low-power circuits, if it
is near powerful transmitters. Free-power radios used to be all the rage
among hobbyists. A big wire antenna fed a rectifier circuit that produced
enough snot to power a receiver and amplifier to drive a loudspeaker for
modest audio levels. I built one and used it many years ago in Pittsburgh,
PA. My home was close to several AM stations and my antenna was a wire
about 60 feet long (along with a good ground).

intriguing demonstrations.

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