Message-ID: <4FEF4CC8.4090200@iup.uni-heidelberg.de>
Date: Sat, 30 Jun 2012 21:00:24 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: An asymmetric feeded full wave dipole for the 630m band
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MF,

As i arrived on the hill, a essential thing was missed: The antenna!=20
Someone has carefully removed the complete construction, just a piece of=20
a few meters remained in a tree.
A pity :-(
That must have been forest workers or so. It was to be expected that=20
this will happen but i didn't expect that the complete construction will=20
be taken.
Don't know when this happened, i didn't use the earth antenna for a long=20
time.

Now i have just 1100m of that wire left, at home.

I think i won't build a new earth antenna, not at all at this location=20
;-) But i will try a MF dipole in some time.

Thinking back what was done with this antenna, Michael Oexner received=20
me in 45km distance on 8970 Hz in DFCW-600. Also F5WK and others=20
reported to see me in QRSS-3 on 137 kHz. It was an interesting project=20
and worth the effort, even for that short time.

73, Stefan/DK7FC


Am 30.06.2012 14:41, schrieb Stefan Sch=E4fer:
> MF,
>
> Another thing. Right now it is 32 =B0C here. Best place it to stay on=20
> the beach or on the top of a hill in the forest. Today i choose the=20
> forest.
>
> Accidentally there is my 700m (ish) long earth antenna which has an=20
> average height above ground of 8m. Today i want to use it as a dipole=20
> for the 630m band. The feed point is somewhere in the middle but not=20
> exactly known.
>
> What will the efficiency and radiation pattern be? Is it a dipole or=20
> what? EZNEC says it will have 10 Ohm Z=3DR at resonance (Cu losses +=20
> "typical" ground losses).
>
> The WX forcast says there will be much QRN in the evening, anyway.
>
> Maybe someone can listen from time to time on 476.5 kHz? I will listen=20
> on the band (+ 500 kHz +-) too and maybe a QSO is possible. Who knows...
>
> If the antenna behaves as a dipole it should radiate E/W, so good=20
> chances for UK, PA and DF6NM, DJ2LF...
>
> I'll start now and may be "QRV" in 2 hours or so.
>
> Here, the first time my PA will operate in /p. Nice that it is smaller=20
> than a VHS video cassette and allows to generate QRP at high efficiency=
!
>
> 73, CU, Stefan/DK7FC
>