#1
|
||||
|
||||
Antenna paradoxon!
Reading the Bionic 01 Video thread I stumbled here:
http://www.geotech1.com/forums/showt...t=16173&page=5 over hung's statement: Quote:
So my question: Does this RT Examiner rotates on its own if you place it on some holder and put some goldring near?! If not, the muscles of the arm and hand including the whole body is the detector - if it works at all.... But back to the main topic: Everybody who has a radio knows that the antenna works best if it has the best gain when the lenght matches with the frequency or is an exactly part of it (1/2, 1/4), and, more important, if the polarisation / direction is the same. The signal of a vertically FM tx antenna that works around 4m (=wavelenght - around 80-100MHz) so best can be received wit a vertically 4, 2, 1m or 50cm antenna. So why the hell all those telescopic LRLs think they can point directly with the antenna into the targets direction and have then the best gain? They don't work like a non-offset (shaped like a circle, not elliptic) parabolic satellite dish! If those LRL antennas point directly into the targets direction, they usually must have the lowest reception of the signal, because they just representing a small point then. Circumpolarized waves? Tell me more. |
|
|