Differences

This shows you the differences between two versions of the page.

--- glossary [2022/01/27 20:50] – 2e0lxq
+++ glossary [2023/11/11 13:44] (current) – m0lte
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 ====== 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. - There is also [[jargon|Jargon and Acronyms list]] //
 **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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 **Oscillation** - A repetitive variation (usually in time) for a measure or value about a central value, e.g. a sine wave oscillates regularly between two peak values (positive/negative) about a central value of zero.
+**Packet** - in the context of amateur radio, refers to [[packet|packet radio]]. There is a glossary of packet radio specific terms [[packet:glossary|here]].
 **Polarisation** - The property of a wave (usually transverse) that defines the geometrical orientation of the oscillation of that wave, e.g. a sine wave could be said to have vertical polarisation.
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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.
-**Radiation** - Energy that travels away from a source. The energy has two fields associated with it (electrical, magnetic) and shows wavelike properties. Radio waves radiate at the speed of light, sound waves considerably more slowly (approximately 330 metres per second).
+**Radiation** - Energy that travels away from a source. The energy has two fields associated with it (electrical, magnetic) and shows wavelike properties. Radio waves radiate at the speed of light (c, or approximately 300,000,000 metres per second), sound waves considerably more slowly (approximately 343 metres per second).
 **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.
-**Voltage** - An measure of the energy possessed by a quantity of electricity: a source of energy of one volt is able to deliver one joule of energy for each coulomb of charge that flows. It is measured in volts, V.
+**Voltage** - A measure of the energy possessed by a quantity of electricity: a source of energy of one volt is able to deliver one joule of energy for each coulomb of charge that flows. It is measured in volts, V.