Re: [HCDX] Re: Antipodal Focusing

["Thomas Giella KN4LF" <kn4lf@xxxxxxxxxxxxxxx>]

I said at or NEAR the antipode. For instance the antipode from Plant City,
FL, USA is well off of the west coast of Australia in the Indian Ocean but I
regularly work into central and western Australia, on 160 meters phone with
100 watts because it's NEAR the antipode.

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 5:08 PM
Subject: [HCDX] Re: Antipodal Focusing


>
>
>
> Sorry to break this to you, but Thailand is nowhere near antipodal from
the
> US. For starters both are in the Northern Hemisphere... Unfortunately
there
> is little land on the opposite side of the globe from the USA --- in the
> Indian Ocean.
>
> 73, Glenn Hauser
>
> Yes Radio Thailand on 7260 kc at my local sunrise sure is stable here in
> Central Florida, even more so then R. Australia on 9580 kc. There is a
> propagation mode called anti-podal focusing. If you are at or very near
the
> opposite side of the planet from the station you are receiving from and
the
> aurora ovals are retracted, the RF signal can travel on all available
> geometric (GC) great circle paths, all coming together at the opposite
side
> of the planet and adding up to a big signal. Antipodal focusing may
explain
> Radio Thailand's big signal here in the U.S. Antipodal focusing is best at
> the fall/spring equinox of which we are fast approaching.
>   A neat HF propagation project would be to keep track of Radio Thailand's
> 7260 kc signal every morning at local sunrise here in the U.S. for 365
days
> and plot it's signal strength versus the Ap index.
>
> 73,
> Thomas F. Giella, KN4LF
> Plant City, FL, USA
> EL87WX
>
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THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed
and/or modified under the conditions set down in the Design Science License
published by Michael Stutz at http://dsl.org/copyleft/dsl.txt