[HCDX] Antipodal Focusing, how many SW hops is considered in the 'error margin' voids the definition being met?

["mhev" <mhev@xxxxxxxxxxx>]

Antipodal Focusing, how many SW hops is considered in the 'error margin'
voids the definition being met?

1 hop seems to me well within tolerances, but hop lengths do vary with
frequency (unless you are using a 'ground grazing' HRSxxx antenna type).

An SW hop is 200 ... 300 kms (400 ... 600 kms arc-length-path)...


----- Original Message -----
From: "Charles Hutton" <charlesh3@xxxxxxx>
To: "'a HCDX E-List'" <hard-core-dx@xxxxxxxxxxxxxxxx>
Sent: Sunday, September 07, 2003 17:22
Subject: RE: [HCDX] Re: Antipodal Focusing


> Since an antipodal path length is 12,500 miles and the error between the
> true antipode and the antipode proposed earlier by Mr. Giella is over
3,000
> miles, I know I would not consider his example to be anywhere near
> antipodal.
>
> I don't know of any previous claims that antipodal effect extend that far.
I
> wish it did, as southeastern Africa would be most welcome here.
>
>
> Chuck
>
> -----Original Message-----
> From: hard-core-dx-bounces@xxxxxxxxxxxxxxxx
> [mailto:hard-core-dx-bounces@xxxxxxxxxxxxxxxx]On Behalf Of Thomas Giella
> KN4LF
> Sent: Saturday, September 06, 2003 4:09 AM
> To: a Topica ABDX E-List; a HCDX E-List
> Subject: Re: [HCDX] Re: Antipodal Focusing
>
>
> Glenn  And All,
>   Yes you are being a stickler. Yes I didn't pick the best path example
for
> antipodal focusing BUT in my mind as a teacher I was trying to pass along
an
> idea in a simple form, in layman's terms that popped into my head at the
> moment. Yes I'm still suffering from a summer flu and am not on my toes.
Yes
> I think you are flaming me because our political ideologies differ.
>
> 73,
> Thomas F. Giella, KN4LF
> Plant City, FL, USA
> EL87WX
>
> KN4LF Daily Solar Space Weather & Geomagnetic Data Archive &
> Daily HF/MF Radio Propagation Outlook:
> http://www.kn4lf.com/kn4lf5.htm
>
>
> ----- Original Message -----
> From: "Glenn Hau-ser" <ghauser@xxxxxxxxxxx>
> To: <hard-core-dx@xxxxxxxxxxxxxxxx>
> Sent: Friday, September 05, 2003 10:43 PM
> Subject: [HCDX] Re: Antipodal Focusing
>
> > I don`t think I`m being too much of a stickler to point out that the
> > antipodes of Plant City out in the Indian Ocean west of Australia, at
about
> > 28 S, 98 E, is more than 3000 miles, 5 megameters, from Udorn, Thailand.
> > This is ``NEAR``??
> >
> > Grayline enhancement is a far more likely explanation, and this happens
over
> > paths much shorter than antipodal.
> >
> > I can`t speak to 160m contact experience, but I`ll bet the signals from
W &
> > C Australia are coming from close to the true azimuth, and not from
random
> > or any/multiple azimuths as would be the case with true antipodal
focusing.
> > Have you checked this with your 160m beam?
> >
> > I`m with Walt about antipodal focusing being from a tight area. During
his
> > period of activity from Hawaii, Richard E. Wood also made much of
antipodal
> > reception from Zambia.
> >
> > As for programs about propagation prediction, I think experience and
> > understanding the basic principles are more useful.
> >
> > 73, Glenn Hauser





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