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Message-ID: <003001cb1eba$b04ba950$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <BFF6723B062BFF40B4B7A6CF670160B4040FEB50@argos2.clb.tcfr.thales> <002301cb1e8c$d28d4740$4001a8c0@lark> <4C35C346.7080307@iup.uni-heidelberg.de>
Date: Thu, 8 Jul 2010 17:26:57 +0100
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Subject: LF: Re: TA DX on the dreamers band?
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Hi Stefan, Mmmm I suppose I put my head right into the noose there :-)=
)

I think this is a difficult one. I am sure the ideal time would be jus=
t
before sunset in Canada or just before dawn in Europe. That is not muc=
h of a
help as flying kites at those times is not really feasible  :-))   Thi=
nking
more generally I would say the best time in a daylight path might be=
 mid-day
at mid path.....but that is only a "gut feeling". But in daytime, summ=
er
might be better for daytime propagation than winter (not allowing for
seasonal noise variation) ......I'm ducking and diving and hedging by=
 bets
:-))

It could be Paul's waveguide propagation equations would give helpful
answers. If only to calculate the approximate signal levels to compare=
 with
the previous tests. Its 4 times further that suggest 16 times the ERP=
 or
"capability" of the system. Hopefully if the VLF effect helps it might=
 only
need be nearer to 6 to 8dB. There may also be a limitation to how narr=
ow a
bandwidth you can use on reception on a path of this length.

I am watching with interest, this is quite a new area, and you can't=
 beat
experimentation. If that don't fit the theory..... you have to devise=
 a new
theory ....not junk the measurements, because you cant argue with
measurement.

Best Wishes
Alan G3NYK

----- Original Message -----=20
From: "Stefan Sch=E4fer" <Stefan.Schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, July 08, 2010 1:23 PM
Subject: VLF: TA DX on the dreamers band?


> Alan,
>
> Which time (UTC) would be your recommendation for trying a transatla=
ntic
> DX reception on 9 kHz, say to canada?
> Any ideas?
>
> Other experts are asked as well here!
>
>
>