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Date: Mon, 28 Dec 2009 15:40:27 +0100
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Thread-Topic: AW: LF: Influence of a TX antenna to a small rx antenna
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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: AW: LF: Influence of a TX antenna to a small rx antenna
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


Hi Ken,=20
Yes, there is a strong interaction. In principle my active antenna does no=
t differ to the PA0RDT Whip.
But the dimension of the interaction depends on the kind of your TX antenn=
a. I think a high vertical does more interact than I short vertical with=
 many toploads, as long as the RX ant is not placed under these toploads..=
.
73, Stefan/DK7FC
PS: See the pic of my last report to get an impression of the interaction.=
..
-----Urspr=FCngliche Nachricht-----
Von: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacks=
heep.org] Im Auftrag von Ken
Gesendet: Sonntag, 27. Dezember 2009 13:21
An: rsgb_lf_group@blacksheep.org
Betreff: Re: AW: LF: Influence of a TX antenna to a small rx antenna

Hello Alan.
A very interesting paper of yours, is it likely that there will be the sam=
e=20
interaction between a T antenna and the PA0RDT Mini Whip?

73.
Ken
M0KHW


----- Original Message -----=20
From: "ALAN MELIA" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, December 27, 2009 11:51 AM
Subject: Re: AW: LF: Influence of a TX antenna to a small rx antenna


Hi Stefan I hope it does not give you indigestion :-))

Good luck with it.....all LF sites are different so in general require=20
different detailed solutions. It seemed generally to be sufficient to=20
de-tune the unused antenna to reduce the interaction to low levels.

Best Wishes for Dx in the New Year
Alan G3NYK

--- On Sun, 27/12/09, Stefan Sch=E4fer <schaefer@hst.tu-darmstadt.de> wrot=
e:

> From: Stefan Sch=E4fer <schaefer@hst.tu-darmstadt.de>
> Subject: AW: LF: Influence of a TX antenna to a small rx antenna
> To: rsgb_lf_group@blacksheep.org
> Date: Sunday, 27 December, 2009, 10:55
>
>
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> Hi
> Alan, tnx, i have
> printed your article and will read it now at breakfast
> ;-)
>
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> Perhaps
> I will come back
> with some questions... J
>
>
>
> 73,
> Stefan/DK7FC
>
> -----Urspr=FCngliche
> Nachricht-----
>
> Von:
> owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] Im Auftrag von ALAN
> MELIA
>
> Gesendet:
> Sonntag, 27. Dezember
> 2009 01:32
>
> An:
> rsgb_lf_group@blacksheep.org
>
> Betreff: Re:
> LF: Influence of a TX
> antenna to a small rx antenna
>
>
>
>
>
>
>
>
>   Hi Stephan yes the aerialls will
> be very close
>   compared with the wavelength so they will interact
> particularly is tuned. We
>   did some measurements ar Finbar's location several
> years ago
>
>   http://www.alan.melia.btinternet.co.uk/aecouple.htm
>
>
>
>   The interaction was measured on an antenna  RF
> bridge, and demonstrates
>   the coupling between two wires.
>
>
>
>   Best Wishes
>
>   Alan G3NYK
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