LF: Fw: Calculating surface wave by AO

["Dick Rollema" <d.w.rollema@gironet.nl>]

To All from PA0SE

-----Oorspronkelijk bericht-----
Van: Brian Beezley <k6sti@n2.net>
Aan: Dick Rollema <d.w.rollema@gironet.nl>
Datum: donderdag 11 november 1999 15:34
Onderwerp: Re: Calculating surface wave by AO


> At 01:38 PM 11/11/99 +0100, you wrote:
> > Dear Brian,
> >
> > Already several years ago I bought AO 6.36 and NEC/WIRES 1.62 from you and
> keep on using it frequently with very satisfactory results.
> > My main activity is now on our new LF-band 135.7 - 138.8 kHz. During
> daylight hours contacts are mainly by means of the surface wave and though
> AO does not compute that I wonder whether by some trick it I still could
> find out something about it.
> > For the benefit of EZNEC users I have asked Roy Lewallen the same question
> and he says that the near field option in reality computes the total field
> so outside the real near field region the surface wave is approximated.
> > I presume AO does the same. As a kind of check I had AO compute the "near
> field" at the maximum range of 10 km and found that E/H = 120*pi so it
> certainly was outside the near field region.
> > Thank you for your answer which I will put on the e-mail reflector of the
> RSGB LF-Group.
> > 73, Dick, PA0SE
>
> No version of AO computes the surface wave but NEC/Wires 2.0 does.
>
>
> Brian