glossary
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glossary [2022/01/06 00:25] – 2e0lxq | glossary [2023/11/11 13:42] – m0lte | ||
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====== Glossary of amateur radio terms ====== | ====== Glossary of amateur radio terms ====== | ||
- | //The RSGB manuals lack a consistent index or glossary, so this has been created to aid in study. The definitions have been taken from the texts, or where the definition does not exist in the manuals, from other reliable sources. If you see an error, notify @trainers on the Discord server and it will be checked & corrected as necessary.// | + | //The RSGB manuals lack a consistent index or glossary, so this has been created to aid in study. The definitions have been taken from the texts, or where the definition does not exist in the manuals, from other reliable sources. If you see an error, notify @trainers on the Discord server and it will be checked & corrected as necessary. |
**Amplitude** - The amplitude is the power of a signal: the greater the amplitude, the greater the energy carried in the signal. | **Amplitude** - The amplitude is the power of a signal: the greater the amplitude, the greater the energy carried in the signal. | ||
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**Ionisation** - The process by which gases in the atmosphere are affected by ultra-violet radiation from the sun: molecules of gas have an electron knocked from their orbit, creating two parts: a free electron with a negative charge [-ve] and a gas ion which now has a positive [+ve] charge. | **Ionisation** - The process by which gases in the atmosphere are affected by ultra-violet radiation from the sun: molecules of gas have an electron knocked from their orbit, creating two parts: a free electron with a negative charge [-ve] and a gas ion which now has a positive [+ve] charge. | ||
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+ | **Isotropic** - An object that has a physical property which has the same value when measured in different directions. Isotropic radiation will have the same intensity regardless of the direction of measurement. | ||
**Modulation** - The process of converting data (e.g. voice) into radio waves by adding that information to a carrier signal. | **Modulation** - The process of converting data (e.g. voice) into radio waves by adding that information to a carrier signal. | ||
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**Propagation** - Any of the ways in which waves travel. Electromagnetic (radio, light etc.) waves can travel in a vacuum; sound waves by comparison cannot. | **Propagation** - Any of the ways in which waves travel. Electromagnetic (radio, light etc.) waves can travel in a vacuum; sound waves by comparison cannot. | ||
- | **Radiation** - Energy that travels away from a source. The energy has two fields associated with it (electrical, | + | **Radiation** - Energy that travels away from a source. The energy has two fields associated with it (electrical, |
**Reactance** - The opposition to the flow of alternating current (AC) in a circuit by a component due to a combination of inductance and capacitance. It is measured in ohms, Ω. | **Reactance** - The opposition to the flow of alternating current (AC) in a circuit by a component due to a combination of inductance and capacitance. It is measured in ohms, Ω. | ||
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**Sensitivity** - The ability of a receiver to detect weak signals. | **Sensitivity** - The ability of a receiver to detect weak signals. | ||
- | **Voltage** - An measure of the energy possessed by a quantity of electricity: | + | **Voltage** - A measure of the energy possessed by a quantity of electricity: |
glossary.txt · Last modified: 2023/11/11 13:44 by m0lte