|View single post by Bruce|
|Posted: Jan 27th, 2010 10:02 PM||
The 3phase power angle is worth knowing but the I am leaning toward it being a noisy pole, with something arcing.
Arcing can be thought of as a very short, very high intensity signal. On an oscilloscope it can look like a very steep sided, spike, of very short duration. In terms of harmonics such a spike shaped signal can generate strong harmonics, both odd and even. Like a square wave, but with more time between jolts for the harmonics to interact., making more harmonics.
If it was a noisy, arcing power pole the gave the right field of signals in California then arcing by itself may be the thing that is most important. I may not need to be extremely high voltage, and a very low power arc may be more then enough energy when placed near the radio receiver. Think about driving a spark plug to arc with a very small gap, 0.01 inches. I don't think you need lots of power, it just adds heat and burns up electrodes. I small gap may not have the overheating problems of a Tesla coil and be capable of running continuously. Again, think spark plug. They take the heat with a little cooling so may a big heat sink for your spark plug.
If it is just the rich harmonic field up beyond the radio receiver frequency that you need, just a gap/arc will do it. And if the noisy pole was just barely able to arc it would do it 120 Hz, twice per cycle.
Having the receiver tuned to an upper harmonic of 60 Hz also makes sense. There should be lots of high harmonics of 60 Hz in the gap/arc field, tuning the radio to a high harmonic allows information riding on that harmonic to be demodulated, as voice. Maybe they can speak at a higher harmonic of the radio receiver frequency and harmonic coupling allows easier reception of their low power signal.
Well, sometimes brainstorming is just that.
Keith Clark wrote:
I have drawn it out to better understand it, and I have come up with the following conclusions:
I think it could be explained as intermitant arcing at or near the pole.
Worth investigating. If it was just residential electicity without businesses/factories odds are probably against it, but worth finding out I think.
If it is an arc it would most likely be 120 Hz because 60 Hz has two voltage peaks, one you can thing of as positive and one negative and both peaks can arc to ground.
Electricity in a wire travels as a sine wave that is a smooth waveform with ony even harmonics and not a lot of power in the very high harmonics, like at the radio receiver frequency. An arc, spike wave form has both odd and even harmonices with a lot more power in the high harmonics.
Yes Keith, I believe you will.