Talk:Random wire antenna

Untitled

My first shot at creating a wiki page. I only had one source, please add info from other sources if you have it. Bmccaff (talk) 05:18, 8 December 2007 (UTC)

Update, found some info on the web. Bmccaff (talk) 05:23, 8 December 2007 (UTC)

"Antenna Diversity"

The fact that a large antenna is not as susceptible to small-scale fading is not a diversity effect. The Article you link to (effectively, the "Antenna Diversity" article) actually starts with (emphasis mine):

> Antenna diversity, also known as space diversity or spatial diversity, is any one of several wireless diversity schemes that uses two or more antennas to improve the quality and reliability of a …

So, that's not the case here.

Also, from an information-theoretical point of view, you don't inherently get the advantage of uncorrelated receive paths – if that were the case, the payload signal would actually cancel itself out.

Furthermore, the idea that an LW/MW/SW antenna, which typically is considerably shorter than half wavelength, is subject to significantly different fading situations at different points bears no physical reason. Fading effects also scale with wavelength.

I'm hence removing that section without replacement, sorry. — Preceding unsigned comment added by Marcusmueller ettus (talk • contribs) 09:43, 20 July 2017 (UTC)

UnUn not BalUn

A "random" length wire antenna is an unbalanced end-fed antenna. The impedance matching transformer used with this type antenna is typically an unbalanced auto-transformer (UnUn), not a balanced transformer (BalUn) as stated in the caption below the image in this article. Ken (talk) 16:27, 23 October 2020 (UTC)

Random wire antenna used for transmitting avoids resonant lengths

The article says: A quarter-wavelength sized wire works best, and unless fed through an unun, a half-wavelength will exceed the matching ability of most tuners. If an antenna's electrical length is a quarter or half-wavelength at a given operating frequency then it is a resonant antenna, not a random length (i.e., non-resonant) antenna. One of the design goals of a truly random length antenna is to avoid wire lengths that are resonant at any potential operating frequency.Ken (talk) 16:57, 23 October 2020 (UTC)