Talking a little about the possible frequencies in common radios, and about AM and SW.
Frequency range. Source: http://willians.pro.br/
| range | from | to | wavelength |
| ELF | 30 Hz | 300 Hz | 10 7 meters |
| VF | 300Hz | 3 KHz | 10 6 meters |
| VLF | 3KHz | 30 KHz | 10 5 meters |
| LF | 30 KHz | 300 KHz | 10 4 meters |
| MF | 300 KHz | 3 MHz | 10 3 meters |
| HF | 3 MHz | 30 MHz | 10 2 meters |
| VHF | 30 MHz | 300 MHz | 10 meters |
| UHF | 300 MHz | 3 GHz | 1 meter |
| SHF | 3 GHz | 30 GHz | 10 - 1 meters |
| EHF | 30 GHz | 300 GHz | 10 - 2 meters |
| Millimeter Waves |
above |
300 GHz |
10 - 4 meters |
| Infrared Rays | 10 11 Hz | 10 15 Hz | 0.7 - 6 meters |
| Visible Light | 10 15 Hz | 10 15 Hz | 0.4 - 6 meters |
| Ultraviolet Rays | 10 15 Hz | 10 16 Hz | 10 - 8 meters |
| "X" Rays | 10 17 Hz | 10 20 Hz | 10 - 9 meters |
| "Gamma" Rays | 10 19 Hz | --- | 10 - 13 meters |
| "Cosmic" Rays | 10 22 Hz | --- | 10 - 14 meters |
|
Table of frequency classification in the Frequency Spectrum Notes:
Wavelength: is the size of the wave amplitude. The higher the frequency, the shorter the wavelength. Audible sounds are in the ELF range up to 20 KHz. Telecommunications (radio, TV, telephony, etc.) are distributed in the VHF, UHF, and SHF bands. |
Read more at:
| 3 - The Frequency Spectrum -> http://willians.pro.br/frequencia/cap3_espectro.htm
3.1 - AM Radio Frequency -> http://willians.pro.br/frequencia/cap3_radio_am.htm 3.2 - FM Radio Frequency -> http://willians.pro.br/frequencia/cap3_radio_fm.htm |
Do you know about the Wideband WebSDR maintained by the Faculty of Electrical Engineering, Mathematics, and Computer Science at the University of Twente, Enschede - The Netherlands? (Link: http://websdr.ewi.utwente.nl:8901/)
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