November 2000
Intermediate to advanced
336 pages
7h 43m
English
Content preview from Radio and Electronics Cookbook
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13
Waves – Part 3
Introduction
When we talk about the spectrum being divided up into bands, this is just for our convenience; there are no natural divisions although, as we have seen, some of the properties of different bands really are different! Let’s look at Figure 1, and see how the frequencies are divided up.
Figure 1 Diagram of radio frequency spectrum
The divisions
• Very low frequencies (VLF) cover the range from a few kilohertz up to 30 kHz. Very long-range communication is possible, but at very small bandwidths. It is used for special purposes.
• Long waves (LW) are used for medium-distance commercial broadcasting and have frequencies ...
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