Talk:T-antenna

Antenna RMS Titanic

This is the antenna of the RMS Titanic, It was a multiwire T with a 50 m vertical wire and 4x120 m horizontal wires.
4 x120 m horizontal wires
73
--F1jmm (talk) 19:45, 12 June 2012 (UTC)

Thanks. I thought I read somewhere it had three wires. I corrected the caption. --Chetvorno^TALK 20:31, 12 June 2012 (UTC)

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)

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

$R_{R}(500{\text{kHz}})=20\pi ^{2}({l \over \lambda })^{2}=20\pi ^{2}({0.33 \over 4})^{2}=1.3\Omega \,$

$R_{R}(1000{\text{kHz}})=5.4\Omega \,$

With the long top load the radiation resistance will be approximately 4 times this

$R_{R}(500{\text{kHz}})=5.4\Omega \,$

$R_{R}(1000{\text{kHz}})=21.5\Omega \,$

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. --Chetvorno^TALK 10:56, 16 March 2014 (UTC)

thank you --F1jmm (talk) 10:52, 27 April 2014 (UTC)

Rename to T and inverted L aerials?

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".

What I am trying to decide is whether the article name should be changed to include the inverted L, or whether it should be left the as-is and Inverted L aerial made a redirect. Any opinions? --Chetvorno^TALK 00:37, 8 March 2014 (UTC)

hello in France I inverted L aerials; inverted L aerials friendly --F1jmm (talk) 10:51, 27 April 2014 (UTC)

Thank you. I see on the French WP all wire antennas are under one article, Antenne long-fil ("Long-wire antenna"). --Chetvorno^TALK 02:26, 29 April 2014 (UTC)

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)

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. --Chetvorno^TALK 07:26, 14 June 2014 (UTC)

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)