Re: [HCDX]: Re: que. for prop. gurus

["KC7LDP" <kc7ldp@xxxxxxxxxx>]

I can't contribute a web address but, I can say that I have ALL copies of
FT's 'Proceedings'. If anyone wants part of any year, please let me know.
John, David, Guy and others were instrumental in doing heavy research with
propagation to the Indos's and PNG's; I believe it was called the 'Sweet
Spot'. Please let me know if anybody needs this info.

Terry, KC7LDP
----- Original Message -----
From: <Delibert3A@xxxxxxx>
To: <hard-core-dx@xxxxxxxxxxxxxxxx>
Sent: Saturday, April 01, 2000 3:37
Subject: Re: [HCDX]: Re: que. for prop. gurus


> It has not been my experience that high solar numbers necessarily mean
poor
> tropical band DX.  DXing from the U.S. east coast, I find that the
magnetic
> field is the main thing to watch.  When it's very quiet, propogation is
> usually good from PNG and Indonesia in our local morning, especially in
the
> spring and fall.  (It has been observed by Bryant and Clark that the
signals
> are strongest from the area on the equator where it's about 9 - 10 p.m.
local
> time.)  When the field is disturbed, local morning propagation of Asians
may
> be poor, or it may move to other regions, sometimes to the north (Vietnam,
> Laos, China) and sometimes to the West (Andaman Islands, Bangladesh,
India,
> in fall and winter).  When there are major storms, weird things can
happen,
> and some very unexpected stations from the Western Pacific may pop up.
>
> Reception of Indonesians is also possible on the East Coast in our local
> evening, from September to about April.  Best reception has been found to
> occur when there has been a major solar flare, but the magnetic shock has
not
> yet arrived.  (Those conditions can produce some spectacular morning
> reception of Indonesians here also.)
>
> Solar flux levels affect this too.  In my experience, when they are really
> low (75-100), the ionosphere seems almost dead, and I don't hear much from
SE
> Asia even when the magnetic field is very quiet.  When the flux level gets
up
> to 150 or more, the ionosphere comes alive.  But, when solar flux gets
even
> higher, it contributes a level of background noise that can mask some weak
> signals.
>
> There are some very good articles on tropical band propagation by John
> Bryant, Dave Clark, and others in the Proceedings series of books,
produced
> by Fine Tuning in the late 1980s and early 1990s.  I think copies are
still
> available, but I'm not sure where to get them.  Maybe someone reading this
> can contribute a web address?
>
> Hope this helps.
>
> Regards,
> Art Delibert
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