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Date: Thu, 25 Feb 2010 01:14:21 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B18@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: 9 Dreamers
Thread-Index: Acq1dyt90d0+GTqtTNONL+LkAJzSeQAKrjEi
References: <001c01cab575$6bbb0460$0401a8c0@xphd97xgq27nyf>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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Subject: LF: AW: 9 Dreamers
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Here i agree. And here i understand "dreamers" in a positive and optimisti=
c way, just like children are dreamers!
We have written so many mails (including me, of course ;-) ) und could sta=
rt now just to try what is possible to reach more than 10km if not done ye=
t.=20

On the LF pages of DK8KW i found a notice of a successful 2 way QSO over=
 10km @ <9kHz. Does anybody know about more than 10km by amateurs?

Yesterday in the night i talked more than 1 hour to Markus/DF6NM and he pe=
rsuaded me to try it with the 100m vertical in a first test. Maybe i get=
 that temp licence for a 300m kite vertical but the public autoritys are=
 still discussing if i need a special casualty insurance...

Do you, the group, think that it makes sense to try it if the next listeni=
ng station is >50km or even more away? What could be possible if this woul=
d be the arrangement with the 100m vertical:
=20
The wire has abt 580pF
I can get a air coil with L=3D85mH out of a 20kV field. DC resistance abt=
 150mOhm, continous current abt 30A, voltage over coil abt 30kV rms (if it=
 remains dry(!)), measured self resonance frequency abt 50kHz.
So, if f=3D8,9kHz, a parallel C of abt 3,2nF is needed (i can get some 470=
pF/40kV Cs, no problem)
The voltage across my thin wire should be limited to abt 20kV rms, that me=
ans, antenna current should not exceed 650mA.
If Rik's 1/f dependency is valid, then my ground losses will be in the reg=
ion of 250 Ohm (no houses and trees there on the hill in a radius of abt=
 100m; 15Ohm @ 137 kHz).
So, 100W TX power would radiate 1,4mW and thus the efficiency would be 0,0=
014%. In that case, i mustn't apply more than 100W since the voltage acros=
s the wire would be to high, so no need for a QRO PA...
=20
If that calculation is reasonably correct, what distance could be reached=
 with 1,4mW @ 8,9 kHz in e.g. QRSS10 and the noise level that can be expec=
ted on a sunday morning? :-)
=20
73 es wish gl to all those, who are trying in these days ;-)
=20
Stefan/DK7FC

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