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Date: Tue, 16 Mar 2010 21:30:56 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B5D@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: LF: 8.97kHz antennas
Thread-Index: AcrFQdjmccBsytJUTESU9DlaCeF69AAAoKy4
References: <910844.27140.qm@web86505.mail.ird.yahoo.com> <4B9FDFA7.7090208@gmx.com>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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Subject: AW: LF: 8.97kHz antennas
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Dear group,
=20
We can be optimistic about further successes in the VLF sector i think. Th=
e most enjoyable finding (within ham experiments)is, that the E field deca=
y relly seems to be rather ~ 1/sqrt(d) than ~1/d :-) That is an important=
 difference to 137kHz, isn't it?
=20
A little dreaming:
Does that mean that if the ERP is 3dB higher (21kV instead of the 15kV i=
 had yesterday), the maximum distance will be 4 times the old distance, id=
eally?
That would mean, with a 300m vertical +3dB QRO, the ERP is at least 13dB=
 more, so the distance could theoretically cover the whole world?
We are now about 3kHz below the lowest alpha station!
=20
What about the retireds of you? For you it would be ideal and easy to chec=
k what is possible with the earth antennas. Just buy some 100m of cable an=
d bury/hide it at midnight near a field or a forrest. Then, apply some pow=
er out of a audio amp, for a first step. A QRSS mode message could be reco=
rded to a cheep usb-mp3-player as a mp3 file and could be transmitted, eve=
n in repeat mode. Starting with 2x50m, then going to 2x100m and so on. The=
n, the dependency of the virtual loop area could be estimated. Not expensi=
ve, no trees or towers to climb, no high voltage, no big garden needed. Yo=
u just don't have to ask for a permission for that ;-)
Would be interesting!
=20
73, Stefan/DK7FC
=20
=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Mike.WE0H
Gesendet: Di 16.03.2010 20:44
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: 8.97kHz antennas



Years ago it seemed difficult to radiate a good LF signal, that changed
when many guys got on the air and figured it out; same with the MF band.
This VLF band could be the same way. Get on the air and try different
antennas and equipment until you figure it out. Maybe someday the VLF
band will be busy with many stations?

Mike
WE0H
/16



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