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In the page it is stated that 1 dBd equals 2.15 dBi. Unfortunately, this is only true in free space. At ground levels, depending on the antenna height, this can be 6-7 dBi. 5.168.129.245 ( talk) 16:49, 25 March 2022 (UTC)
Frustrating thing with decibel is how it strictly represents a relative value but in common usage or in specific practices is simultaneously used to represent an "absolute" value relative to a reference that may or may not be explicitly stated. I'm sorry I got carried away with making edits that got reverted. I'll just put my attempt here in talk...hopefully someone can figure out something better than the self-contradictory way it is written there currently:
"The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B) that expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. In practice, the decibel may be expressed in the context of a fixed reference value, in which case its symbol should be suffixed with letter codes to indicate the reference value (for examples see § Suffixes and reference values)." Em3rgent0rdr ( talk) 15:55, 27 July 2022 (UTC)
Is that a typo? "1 dB = 0.115 13… Np = 0.115 13…." I didn't want to just delete things for no reasons but it just read a bit weird. 24.49.238.103 ( talk) 16:55, 7 February 2024 (UTC)
In radio receivers, dBμ is commonly used dB relative to 1μV at the specified impedance. (75 or 300 ohms for TV and FM, 50 ohms for some other radios.) I don't even know if μ is allowed in article titles. This page could discuss it, and other voltage relative units (with a known impedance). Gah4 ( talk) 21:38, 20 February 2024 (UTC)
This is the
talk page for discussing improvements to the
Decibel article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
Archives: Index, 1, 2, 3, 4, 5, 6, 7, 8Auto-archiving period: 90 days |
This
level-4 vital article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||
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In the page it is stated that 1 dBd equals 2.15 dBi. Unfortunately, this is only true in free space. At ground levels, depending on the antenna height, this can be 6-7 dBi. 5.168.129.245 ( talk) 16:49, 25 March 2022 (UTC)
Frustrating thing with decibel is how it strictly represents a relative value but in common usage or in specific practices is simultaneously used to represent an "absolute" value relative to a reference that may or may not be explicitly stated. I'm sorry I got carried away with making edits that got reverted. I'll just put my attempt here in talk...hopefully someone can figure out something better than the self-contradictory way it is written there currently:
"The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B) that expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. In practice, the decibel may be expressed in the context of a fixed reference value, in which case its symbol should be suffixed with letter codes to indicate the reference value (for examples see § Suffixes and reference values)." Em3rgent0rdr ( talk) 15:55, 27 July 2022 (UTC)
Is that a typo? "1 dB = 0.115 13… Np = 0.115 13…." I didn't want to just delete things for no reasons but it just read a bit weird. 24.49.238.103 ( talk) 16:55, 7 February 2024 (UTC)
In radio receivers, dBμ is commonly used dB relative to 1μV at the specified impedance. (75 or 300 ohms for TV and FM, 50 ohms for some other radios.) I don't even know if μ is allowed in article titles. This page could discuss it, and other voltage relative units (with a known impedance). Gah4 ( talk) 21:38, 20 February 2024 (UTC)