Home |
Search |
Today's Posts |
#10
![]() |
|||
|
|||
![]()
Rick wrote:
Doesn't the horizontal part of the inverted L need to be as high as possible for best results? I'd run into the same problems I'm running into in putting a dipole or inverted V up high enough. Not exactly. Make the vertical section of the Inv-L as long as feasible. The vertical section is the highest current section and therefore has the greatest effect. Or instead of an Inv-L, make it a T antenna with a vertical section and a symmetrical top hat. The symmetrical top hat doesn't do much radiating. Here's what EZNEC says using VERT1.ez as the reference. 40m 33' Vert1 has -0.04 dBi gain omnidirectional. 16.5'-16.5'Inv-L has 1.04 dBi gain with some directivity. 16.5'-23.5' T antenna has 0.19 dBi gain omnidirectional. Note: 16.5' = vertical, 23.5' = horizontal top hat. Performance wise, I don't think you could tell the real vertical from the T except for the T's lower feedpoint impedance. -- 73, Cecil, http://www.qsl.net/w5dxp |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Inverted ground plane antenna: compared with normal GP and low dipole. | Antenna | |||
Why Tilt ? - The Terminated Tilted Folded Dipole (TTFD / T2FD) Antenna | Shortwave | |||
I Want Another Antenna | Shortwave | |||
Workman BS-1 Dipole Antenna = Easy Mod to make it a Mini-Windom Antenna ! | Shortwave | |||
QST Article: An Easy to Build, Dual-Band Collinear Antenna | Antenna |