DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=btinternet.com;
  h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding;
  b=qY4xGEO9J+6IhIv+Lnhb04SMu9g1Cd1x0dWsc1yC1KUHNMjhL963ScARAjamqKwd3/vn6WlDwFC1HYHXh6m+zziMM6BoDeqVsSD6bFMp6pFLy+dGvPJ2leslu7GmelxffJqJxEIkEatQEemwqtWuoJXrP631bnsq+v8oXppu8nE=;
Message-ID: <308300.74126.qm@web86507.mail.ird.yahoo.com>
Date: Mon, 1 Mar 2010 01:04:27 +0000 (GMT)
From: ALAN MELIA <alan.melia@btinternet.com>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <1Nltdr-1y1JXU0@fwd01.t-online.de>
MIME-Version: 1.0
DomainKey-Status: good (testing) 
Subject: Re: LF: 9kHz/Mini Whip
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Hi Ha-Jo yes I forgot about the power-feed choke :-))
Alan


--- On Mon, 1/3/10, hajo.brandt.dj1zb@t-online.de <hajo.brandt.dj1zb@t-onl=
ine.de> wrote:

> From: hajo.brandt.dj1zb@t-online.de <hajo.brandt.dj1zb@t-online.de>
> Subject: Re: LF: 9kHz/Mini Whip
> To: rsgb_lf_group@blacksheep.org
> Date: Monday, 1 March, 2010, 0:37
> I would also recommend to increase
> the inductance of the 470uH power
> feed choke. I have built similar active aerials using
> operational
> amplifiers
> like OP27 or LT1252 (just 4 to 10 mA current consumption,
> so my choke
> is
> 10mH) and can receive the russian Alpha signals down to
> 11.9 kHz in
> southern Germany
> without problems (unless there are switched off, as it
> happens from time
> to time).=20
>=20
> 73 Ha-Jo, DJ1ZB
>=20
>=20
> "ALAN MELIA" <alan.melia@btinternet.com>
> schrieb:
> > Yes Laurence KL1X modified the circuit for use from
> 10kHz. I think it needs some of the coupling caps increased
> in value. Alan G3NYK
>=20
> >On Sun, 28/2/10, Ken <ken.h.wright@btinternet.com>
> wrote:
>=20
> > From: Ken >ken.h.wright@btinternet.com>
> > Subject: LF: 9kHz/Mini Whip
> > To: >rsgb_lf_group@blacksheep.org
> > Date: Sunday, 28 February, 2010, 20:17
> >Hi All.=20
> >Has anyone had any experience using the PA0RDT Mini
> Whip on 9kHz?=20
> >73s Ken=20
> > M0KHW
>=20
>=20
>=20