Mike W0BTU wrote:
... how about 1/2 wave monopoles, or monopoles between 90 and 180 degrees?
Could they be useful at any distance on 160?
All monopoles of all electrical heights of 5/8WL and less _radiate_
(launch) maximum relative field (E/Emax) in the horizontal plane --
regardless of
Ionosphere reflection layers are a ever changing part of the DX signal. Yes,
every antenna has its day, but the what angle is consistently better ?. My
experience has been the angle gets higher above ground as the frequency is
lowered. Also this angle is not the same between the equator and
On Thu, Oct 25, 2012 at 1:46 PM, Bruce k...@myfairpoint.net wrote:
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any more.
I noticed a reduction of the tall AM towers starting about the 1960's.
73
Bruce-K1FZ
Wouldn't that have corresponded to the FCC's reduction in
On 10/25/2012 1:46 PM, Bruce wrote:
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any
more. I noticed a reduction of the tall AM towers starting about the
1960's.
73
Bruce-K1FZ
Bruce, I would add one exception to that and that would be the use by
some broadcasters
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any more.
I noticed a reduction of the tall AM towers starting about the 1960's.
An optimized half-wave design (180-195 electrical degrees) is still the
height of choice for AM broadcasters. There are many factors, including
I was involved in broadcast engineering for many years ( probably one of
the reasons for my interest in 160m and AM ).
There were numerous technical write ups about stations who wanted the
maximum theoretical ground wave signal and spent big bucks to put up 5/8
wave verticals. They were
There were numerous technical write ups about stations who wanted the
maximum theoretical ground wave signal and spent big bucks to put up 5/8
wave verticals. They were always disappointed in the unexpectedly reduced
coverage area that resulted.
Most of the reasoning for this unexpected
- Original Message -
From: Guy Olinger K2AV olin...@bellsouth.net
To: Bruce k...@myfairpoint.net
Cc: topband@contesting.com
Sent: Thursday, October 25, 2012 10:56 AM
Subject: Re: Topband: Best angle of radiation ?
Wouldn't that have corresponded to the FCC's reduction in clear
Bruce-K1FZ wrote:
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any more.
I noticed a reduction of the tall AM towers starting about the 1960's.
Guy Olinger replied:
Wouldn't that have corresponded to the FCC's reduction in clear-channel
strategies, and more local market
Lloyd Berg N9LB wrote:
There were numerous technical write ups about stations who wanted the
maximum theoretical ground wave signal and spent big bucks to put up 5/8
wave verticals. They were always disappointed in the unexpectedly reduced
coverage area that resulted. Most of the reasoning
Most of the reasoning for this unexpected negative result was attributed
to the minor high-angle lobe produced by the 5/8 wave coming back down and
interfering with the main lower angle signal. As a result, those station
who had experimented with 5/8 wave towers usually reduced them to 1/2
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