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 vertical radiator is 0.33% and 0.66% of resonance, 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)

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)