Message-ID: <4C3B62ED.3010707@iup.uni-heidelberg.de>
Date: Mon, 12 Jul 2010 20:46:05 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: vlf
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Hi Uwe,

This is very fine that you will be QRV there as well! I am hopefully 
that you will generate a nice signal that will be detectable here in 
Heidelberg (maybe not in the moment, due to heavy thunderstorms, once 
again).

Yesterday i have calculated the antenna C of the 100m and 200m vertical 
with EZNEC+. The ratio of the achieved C is not 2 but 1,88, so maybe i 
cannot transmit on 6,34 kHz but on higher frequencies, such as 6,5...6,6 
kHz. Maybe my variometer can bring it to resonance on 6,34 kHz but you 
see that there is a uncertainty. I cannot do anything else than bringing 
up the kite and check where the resonance will be. Than i can inform 
Markus (or you?) by telephone and he can inform the group where i am 
transmitting.

When will you be QRV? If you want to do TX tests i could try to receive 
you with my earth antenna because there on the mountain the QRM seems to 
be even lower (has to be tested) :-)

Good luck solving your problems! :-)

Best 73, Stefan/DK7FC

Am 12.07.2010 13:31, schrieb Uwe Jannsen:
> Hi Stefan, hi all,
>
> my aerial system is resonant, en fin, finally.
> the 6.34kHz spectrum at JO43SV looks like that:
>
> http://dj8wx-dl.de/vlf
>
> as one can make out looking at the bottom of the pic
> the Q of the system isnt too bad.
>
> the sign visible in the capture (the end of an X) is on 6341,08xHz
> in QRSS1800 mode generated by the homebrew ZPU lf exciter,
> GPS disciplined. 500mV into a simple LW.
>
> I could use the resonant aerial as a TX antennae as well if, if, if
> the PA driver wouldnt regenerate (feed back) the PA output signs.
>
> the problem has to be solved the next weeks.
>
> vy 73
> Uwe/dj8wx
>
>
>
>