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Date: Fri, 29 Jan 2010 02:51:30 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1AB7@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: Question to the groundwave 
Thread-Index: AcqgfcTQocUqf0PIRuKxkrvztkfZ6QAAhuAA
References: <473484.31039.qm@web86505.mail.ird.yahoo.com>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: Question to the groundwave 
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Hi Alan and LF,=20
=20
I know there are some of you who can easily answer my question that follow=
s :-)
=20
The maximum distance of the groundwave at a specific fieldstrength E is (a=
bout) linear increasing with the antenna current of the TX antenna, right?
So, if i have an antenna current of 0,5A and get a maximum distance of 100=
0km, i would reach 2000km with 1A (same RX, same surrounding noise level,=
 same average ground properties, same OP ;-) )?.
=20
I expect, that the groundwave does not immediately stop beyond this 2000km=
 border but rather decreases with 1/r, just as before.
=20
So, if we assume one is increasing the antenna current in the above exampl=
e to 7A, is then a distance of 14000km possible? Sure, thats a very theore=
tical question since there will not be the same ground conductivity on the=
 whole distance but anyway.
=20
And it is said that the groundwave is (nearly) not affected by the daytime=
, by the season and so on. There must be interferences with the sky wave,=
 so QSB, but this does not affect the groundwave at an other RX QTH, where=
 no sky wave is present!?
=20
If there is so much sea water between a transatlantic distance, why is it=
 so difficult to do it with the groundwave? On HF or MF it is clear but on=
 LF?=20
=20
Tnx for enlightning answers...
=20
Stefan/DK7FC
=20
________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von ALAN MELIA
Gesendet: Fr 29.01.2010 01:51
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: Ok its a sea path .. but this is getting silly



Ah this 500k stuff is too easy Graham :-)) oh for 73kHz again !

Alan G3NYK



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