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Hello, you have the characteristics of the T-aerial 50 m vertical wire and 4x120 m horizontal wire, electric, resonant electric réactance, equivalent electric circuit, for the frequencies: 500 kHz and 1000 kHz ? --
F1jmm (
talk)
06:05, 16 November 2012 (UTC)reply
Yes. The antenna is electrically short. The height of a quarter-wave monopole for those frequencies would be 150 and 75 m. So the height of the vertical radiator is 33% and 66% of a quarter-wave, respectively. The radiation resistance without the top-load would be
With the long top load the radiation resistance will be approximately 4 times this
Not bad, considering the radiation resistance of many land-based Ts is under an ohm. If the combined resistance of the ground and loading coil were 5 ohms, for example, the antenna efficiency would be 50% and 81%, respectively, on those two frequencies. --
ChetvornoTALK10:56, 16 March 2014 (UTC)reply
I think this article should also cover the "inverted L" aerial. The "T" and "inverted L" are very similar forms of capacitively loaded wire aerial which are usually treated together in antenna texts. The only difference between them is that in the "T" the vertical radiator wire is attached to the capacitive top load in the center, while in the "inverted L" it is attached at one end. These antennas act very similarly and most of the current content would also cover the "inverted L".
The article perhaps should read, T-Antenna, or 'Top-Hat Antenna', as the term 'aerial' is actually no longer used to describe antennas. Perhaps if you care to compare other antenna articles, very few (if any) call an antenna an aerial. I discovered this article, when trying to locate/create a Wikipedia article named 'Top-Hat Antennas'. Also, searching for 'Aerial' in Wikipedia, results in a disambiguation to 'Antennas'. So it seems logical to change the name to reflect this. Thinking I might just rename the article, any comments? Just my 2 cents worth, Cheers!
Read-write-services (
talk)
23:44, 10 June 2014 (UTC)reply
There are some problems with the changes you made. The term "aerial" is not obsolete; it is used for wire antennas in
British English. Your definition "The antenna consists of a horizontal wire network suspended between buildings..." is insufficiently specific; it can apply to any top-loaded wire antenna, such as the
umbrella antenna, triatic, delta, etc. The term "top-hat antenna" is used for other forms of top-loaded antenna too, but thet's probably okay. Most important, the new article name "T-Antenna" violates WP capitalization rules; "Antenna" shouldn't be capitalized, and the two images you moved were placed in the middle of sentence text, causing unwanted paragraph breaks in the introduction. --
ChetvornoTALK07:26, 14 June 2014 (UTC)reply
Okay thanks for your corrections and input, I didn't realise I wrote that the wires were suspended between buildings-because that is way off, actually the usual suspension is between towers or poles, anyway, thank you. I realise the term aerial is not obsolete, just out of favor. thanks for fixing the move picture issue too, I don't classify myself as an expert, and I always have something to learn, so thanks for that. Cheers,
Read-write-services (
talk)
02:11, 16 June 2014 (UTC)reply
This article is within the scope of WikiProject Engineering, a collaborative effort to improve the coverage of
engineering on Wikipedia. If you would like to participate, please visit the project page, where you can join
the discussion and see a list of open tasks.EngineeringWikipedia:WikiProject EngineeringTemplate:WikiProject EngineeringEngineering articles
This article is part of WikiProject Electronics, an attempt to provide a standard approach to writing articles about
electronics on Wikipedia. If you would like to participate, you can choose to edit the article attached to this page, or visit the
project page, where you can join the project and see a list of open tasks. Leave messages at the
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Energy on Wikipedia. If you would like to participate, please visit the project page, where you can join
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Hello, you have the characteristics of the T-aerial 50 m vertical wire and 4x120 m horizontal wire, electric, resonant electric réactance, equivalent electric circuit, for the frequencies: 500 kHz and 1000 kHz ? --
F1jmm (
talk)
06:05, 16 November 2012 (UTC)reply
Yes. The antenna is electrically short. The height of a quarter-wave monopole for those frequencies would be 150 and 75 m. So the height of the vertical radiator is 33% and 66% of a quarter-wave, respectively. The radiation resistance without the top-load would be
With the long top load the radiation resistance will be approximately 4 times this
Not bad, considering the radiation resistance of many land-based Ts is under an ohm. If the combined resistance of the ground and loading coil were 5 ohms, for example, the antenna efficiency would be 50% and 81%, respectively, on those two frequencies. --
ChetvornoTALK10:56, 16 March 2014 (UTC)reply
I think this article should also cover the "inverted L" aerial. The "T" and "inverted L" are very similar forms of capacitively loaded wire aerial which are usually treated together in antenna texts. The only difference between them is that in the "T" the vertical radiator wire is attached to the capacitive top load in the center, while in the "inverted L" it is attached at one end. These antennas act very similarly and most of the current content would also cover the "inverted L".
The article perhaps should read, T-Antenna, or 'Top-Hat Antenna', as the term 'aerial' is actually no longer used to describe antennas. Perhaps if you care to compare other antenna articles, very few (if any) call an antenna an aerial. I discovered this article, when trying to locate/create a Wikipedia article named 'Top-Hat Antennas'. Also, searching for 'Aerial' in Wikipedia, results in a disambiguation to 'Antennas'. So it seems logical to change the name to reflect this. Thinking I might just rename the article, any comments? Just my 2 cents worth, Cheers!
Read-write-services (
talk)
23:44, 10 June 2014 (UTC)reply
There are some problems with the changes you made. The term "aerial" is not obsolete; it is used for wire antennas in
British English. Your definition "The antenna consists of a horizontal wire network suspended between buildings..." is insufficiently specific; it can apply to any top-loaded wire antenna, such as the
umbrella antenna, triatic, delta, etc. The term "top-hat antenna" is used for other forms of top-loaded antenna too, but thet's probably okay. Most important, the new article name "T-Antenna" violates WP capitalization rules; "Antenna" shouldn't be capitalized, and the two images you moved were placed in the middle of sentence text, causing unwanted paragraph breaks in the introduction. --
ChetvornoTALK07:26, 14 June 2014 (UTC)reply
Okay thanks for your corrections and input, I didn't realise I wrote that the wires were suspended between buildings-because that is way off, actually the usual suspension is between towers or poles, anyway, thank you. I realise the term aerial is not obsolete, just out of favor. thanks for fixing the move picture issue too, I don't classify myself as an expert, and I always have something to learn, so thanks for that. Cheers,
Read-write-services (
talk)
02:11, 16 June 2014 (UTC)reply