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فرشاد افسر متولد بهمن 1366| Designation | Frequency | Wavelength | |
| ELF | extremely low frequency | 3Hz to 30Hz | 100'000km to 10'000 km |
| SLF | superlow frequency | 30Hz to 300Hz | 10'000km to 1'000km |
| ULF | ultralow frequency | 300Hz to 3000Hz | 1'000km to 100km |
| VLF | very low frequency | 3kHz to 30kHz | 100km to 10km |
| LF | low frequency | 30kHz to 300kHz | 10km to 1km |
| MF | medium frequency | 300kHz to 3000kHz | 1km to 100m |
| HF | high frequency | 3MHz to 30MHz | 100m to 10m |
| VHF | very high frequency | 30MHz to 300MHz | 10m to 1m |
| UHF | ultrahigh frequency | 300MHz to 3000MHz | 1m to 10cm |
| SHF | superhigh frequency | 3GHz to 30GHz | 10cm to 1cm |
| EHF | extremely high frequency | 30GHz to 300GHz | 1cm to 1mm |
| Designation | Name | Frequency |
| LW | long wave | 153 - 279 kHz |
| MW | medium wave | 531 - 1620 kHz |
| SW | short wave | 2310 - 25820 kHz |

وبلاگ فرشاد افسر- 1389
بشقساشی شبسشق - tvahn htsv-FARSHAD AFSAR