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The Strange True Story of a Radio Station's Transmitter in New York State
"Jim-NN7K" . wrote in message ... Mike- Tho this NOT about R.F., it is about induction- I agree. And while I realizeit's quite possible to get 'shocks' off an induction coupling that essentially goes to a high impedance, it's a far cry from being able to 'power a house' with a broadcast transmitter that wasn't designed for the purpose. Yes, Tesla lit up bulbs, in one case a reported 50 miles from his transmitter site, but that was with a setup specifically geared to transmit power with brute force, with fairly huge receiving antennas specifically designed to pull the power from the broadcast wave. And before someone brings up RFID tags... Tags are DESIGNED to work in the RF field. They actually couple magnetically like a transformer to the readers antenna. But realize how fast the field falls off and what limited range they have. But actually, in reference to the original comment, I believe IF someone did pull power from the air, it WOULD degrade the broadcast signal. Mike |
#42
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The Strange True Story of a Radio Station's Transmitter in NewYork State
Mike Y wrote:
And while I realizeit's quite possible to get 'shocks' off an induction coupling that essentially goes to a high impedance, it's a far cry from being able to 'power a house' with a broadcast transmitter that wasn't designed for the purpose. The original story that I heard about 40 years ago is that it involved 60 Hz high-voltage power lines. A farmer is supposed to have built an induction coil in a shed directly beneath the power lines and picked up free energy. -- 73, Cecil http://www.w5dxp.com |
#43
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The Strange True Story of a Radio Station's Transmitter in New York State
Cecil Moore wrote in
: Mike Y wrote: And while I realizeit's quite possible to get 'shocks' off an induction coupling that essentially goes to a high impedance, it's a far cry from being able to 'power a house' with a broadcast transmitter that wasn't designed for the purpose. The original story that I heard about 40 years ago is that it involved 60 Hz high-voltage power lines. A farmer is supposed to have built an induction coil in a shed directly beneath the power lines and picked up free energy. I've read that typically 1/3 of the current in a multiple ground wye connected transmission system returns though the earth. Seems a shame not to pass it though a few lightbulbs as it passes by! There was a story just a few years ago about a farmer that was obtaining power from a fence running parallel to a transmission line. He went to court and eventually won his case since this power was already lost in the return resistance of the earth and the power company failed to contain the current within their transmission line. I can't recall what he was doing with it. There was a room in the building of my last employer where no VDT would function properly. We had a survey instrument in the EMI lab so we gave it a try. The 60Hz magentic field in that room was intense. We pulled down some ceiling tiles and found a large steel beam that spanned the length of the building went to ground there. The beam was parallel to the transmission line about 50ft just beyond the outside wall. There was a substation was about 250ft away. I'm sure the beam was grounded at both ends. Seems like the orientation wasn't best for inductive coupling. Could have been carrying some of the return current. A rough estimate of the current had it in the hundreds of amperes. I can't account for it. Strange but true. Later I heard from a former coworker who got a job with Super Computers Inc then spent his first year mapping the "stray voltage" at a site before they built their facility there. They found it can cause problems with their process instrumentation. |
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