Topband
[Top] [All Lists]

Topband: 5/8 wavelength vertical is mo betta than shorterversions??,

To: <topband@contesting.com>
Subject: Topband: 5/8 wavelength vertical is mo betta than shorterversions??,
From: "Richard Fry" <rfry@adams.net>
Reply-to: Richard Fry <rfry@adams.net>
Date: Thu, 26 Sep 2013 12:19:28 -0500
List-post: <topband@contesting.com">mailto:topband@contesting.com>
BC stations tried 5/8 wavelength antennas to maximize their groundwave coverage. Unfortunately, the high angle lobe produced a skywave that caused severe interference fading at night out in their desired coverage area.
Most 50 kW, 24/7, omnidirectional MW broadcast stations such as WJR, KMOX 
etc use a radiator height close to 195 degrees, which produces almost as 
much groundwave field as a 5/8-wave, but without the high-angle lobe 
centered at about 60 degrees elevation.
It was this high-angle lobe that produced self-interference when the skywave 
radiation from it arrived out of phase with the groundwave, at the edges of 
the groundwave coverage area.
RF 

_________________
Topband Reflector

<Prev in Thread] Current Thread [Next in Thread>
  • Topband: 5/8 wavelength vertical is mo betta than shorterversions??,, Richard Fry <=