Topband: EZNEC Ground Errors

[Artek Manuals]

OR

The propagation mode on 160 is not what we have popularly come to "Accept".

There is a growing body of evidence that particularly at gray line that 
signals often arrive at a higher angles. This is often attributed to 
"ducting" . Maybe a lot more of 160 intercontinental propagation is  due 
ducting rather than the more commonly thought of low angle earth to F 
layer hop/multi-hop stuff seen at higher frequencies?

Where do i get a pair of those glasses that lets me look at radio waves 
so I actually see them arrive

Dave
NR1DX

On 12/11/2020 8:58 AM, Roger Kennedy wrote:
> Guy I have ALWAYS thought that the various Computer-based modelling of
> Ground and its effect on Antennas is WAY off . . .
>
> And surely the errors are MOST significant on 160m, not just because
> Antennas are near the ground (in wavelength terms) . . . but also because
> even the ground 130 ft deep is still going to have an effect . . . and there
> is no way EZNEC can possibly take that into account, even if you KNEW what
> was underneath your topsoil !
>
> In my particular case it's not the effect on Verticals on 160m that interest
> me . . . it's the effect on a Low Dipole.
>
> Any DX stations I work on 160m will confirm I put out a pretty respectable
> signal . . . my signal reports around the world and more recently I am able
> to compare my RBN Reports across NA and they tend to be very similar to the
> other British DXers.
>
> However, most people are surprised to discover that for the last 50 years I
> have always used a Horizontal Half Wave dipole on 160m, at around 50ft.
>
> BUT I believe that EZNEC plots showing that most of the RF is just very High
> Angle is WRONG . . . that's because in practice the Ground underneath it is
> rubbish . . . so the Dipole's effective height above Ground is much higher.
>
> And in fact, it seems that most people who have Dipoles on 160m mounted over
> or near a very comprehensive Radial system DO get poor results using them
> for DX . . . but that goes to confirm my theory (which is all based on my
> actual experience on Top Band)
>
> Roger G3YRO
>
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com

-- 
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus