Message-ID: <578BF457DD834F6485E0093B26499230@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <E65F69DD3D804302B0DB57F377030EBF@AGB> <4FDCE611.7070004@iup.uni-heidelberg.de> <4FDCEB38.9090807@kpnmail.nl> <4FDDE5F5.4000307@iup.uni-heidelberg.de>
In-Reply-To: <4FDDE5F5.4000307@iup.uni-heidelberg.de>
Date: Sun, 17 Jun 2012 16:21:10 +0100
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Subject: Re: LF: MF propagation...
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Yes Chris is  50% of the  distance  I am to the  delft  sdr, over land that 
indices a big  loss  ,  I can decode  using  ros-mf-2   during  the  day 
time  , with  150 watts  to  the  Ae , during the night  , I  have  decoded 
with  round  500 mW  Ae feed , Mal being on the  sunny  east coast , has a 
nice water  path  over to EU , just  as  gb4fpr ,  a  path  out to  the 
west over the  Atlantic and south  down the  river Mersey

But  as we  have proved  with the  600  ft delta loop  , a  vertical 
section  is a  requirement  to  radiate effectively,  most old  marine 
installations  , only  had  30  or 40 feet of  vertical  wire  from the 
radio  room to the  top  wire , not  sure  how  the salt water on the 
canvas , wire rigging and  wooden hull's  affected the  signal , Mal  might 
be  able to  advise on that  ?

G..

--------------------------------------------------
From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
Sent: Sunday, June 17, 2012 3:13 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: MF propagation...

> Jan, MF,
>
> Am 16.06.2012 22:23, schrieb pa3abk:
>>
>>
>> FYI I have H24 solid CW QSO with g3xiz  mostly S-7/8 about same distance 
>> both using about 100W.
>
> I can hear G3XIZ very well on the Delft web sdr. It looks to me like the 
> ground wave reaches much much wider above sea water. The effect seems to 
> be extreme on MF, even more than on LF or VLF. Is this possible, i mean 
> can you confirm it?
> Oh, that would explain why all the vessels used 500 kHz for such a long 
> time :-)
>
> That would explain why you can hear G3XIZ H24, since you are much closer 
> to the sea than me.
>
> Here on the land the situation looks to be quite different during the 
> daytime...
>
> 73, Stefan/DK7FC
>
>