Robert,I know EM transmission requires AC voltage. Where does this happen inside the cellphone to enable it to radiate EM waves?? Thanks.
Sure no problem. I'm not quite sure about your first problem, so you might have to research that. As for tall radio towers, they DO NOT use the whole tower. What the tower is for is to get more elevation. The higher up the antenna is, the better. Then they will stick the antenna up onto the tower either vertically or horizontally depending on polarization. If you were to have one station with a verticle antenna and the other with a horizontal you would have a 20dB loss! But If you have both of them as verticle stations, it works MUCH better.Wow. Thanks for sharing that chart. I have a couple of follow-up questions if you don't mind: (1) At the top of the chart, it says certain wavelengths don't penetrate the earth's atmosphere - both at the high end and low end. Why is that so - that only IR and visible can reach us? (2) Looking at the chart, I now understand the relationship between antenna length and frequency, but I have a question regarding what goes on in the tall radio towers - Do they use the entire structure as an antenna, that is, do they run electricity up and down the whole steel structure with all the cross members or is there just a wire somewhere that runs from the ground to the top (is the purpose of the tower to keep the wire stretched to the required length)?
Thanks again.
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