Re: [HCDX] Re: Antipodal Focusing- a program to display

["Joseph Strain" <yodar98@xxxxxxxxxxx>]

Could this proggy I just discovered and am STILL trying to learn how to use


http://www.qsl.net/w6elprop/

I think, properly used  and understood, could Help us undestrand the 
propagation possibilities and true  geographic relationships between target 
country and your shack (you enter YOUR coordinates)

It's really neet, seemingly taking solar flux and sunspot no input to tells 
you whether a particular frequency is OPEN and also  using coordinates  you 
input to SHOW you great circle-wise or mercator projection wise what the 
signal propagation routes would be under the day's conditions-  day-nite 
delimiter disoplayed

ANy skilled in use of this, educate us neophytes on how to get the best 
utility


Yodar
Words MEAN things


----Original Message Follows----
From: "Glenn Hau-ser"
To: hard-core-dx@xxxxxxxxxxxxxxxx
Subject: [HCDX] Re: Antipodal Focusing
Date: Fri, 05 Sep 2003 21:08:50 +0000
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