Date: Sat, 15 May 2010 22:45:36 +0200
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Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1BEF@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Content-class: urn:content-classes:message
Thread-Topic: LF: ref LD30
Thread-Index: Acr0K1wbyANUfadxSzKQ2s5PRSiAzwARDZF9
References: <002701caf394$44cbd980$0401a8c0@xphd97xgq27nyf> <4BEE8B1B.502@iup.uni-heidelberg.de> <4BEE8E75.3050506@iup.uni-heidelberg.de> <001101caf42a$e6d987e0$0401a8c0@xphd97xgq27nyf>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Subject: AW: LF: ref LD30
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Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Mal,=20
=20
That's fine! So you could use 1mm diameter enamelled wire for minimal loss=
es. Also the HV will be rather smaller. Sounds promising...
=20
73, GL
=20
Stefan/DK7FC

=20
________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von mal hamilton
Gesendet: Sa 15.05.2010 14:34
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: ref LD30


Stefan
My Loading coil inductance at 137 is around 0.5mH therefore at 9 kHz it sh=
ould be roughly 116 mH. Not such a big coil in my case.
Tnx info de Mal/g3kev
=20

    ----- Original Message -----=20
    From: Stefan Sch=E4fer <mailto:Stefan.Schaefer@iup.uni-heidelberg.de>=
 =20
    To: rsgb_lf_group@blacksheep.org=20
    Sent: Saturday, May 15, 2010 1:07 PM
    Subject: Re: LF: ref LD30

    ...means L(9kHz) =3D L(137kHz)*232
   =20
   =20
   =20
   =20
    Am 15.05.2010 13:52, schrieb Stefan Sch=E4fer:=20

        Mal,=20
       =20
        I assume you know your antenna capacitance so you can easily calcu=
late your needed inductance. Or, if you know your L for 137kHz, it will be=
 about (137/9)^2 at 9 kHz!
       =20
        Stefan/DK7FC
       =20
       =20
        Am 14.05.2010 20:35, schrieb mal hamilton:=20

                Well, I am getting 15v sine wave into a 50 ohm DL with the=
 LD30, this looks promising. All I need now is a 500W audio amp suitably=
 matched into 50 ohms.
            I prefer to keep a standard 50 ohm system for measuring purpos=
esd.
            or
            I could change the 15v to sq wave and build a class D fet amp,=
 maybe a better approach.
            If I proceed the Ant system would consist of 3 x inv L antenna=
s in parallel, height about 100 ft and each one about 500 ft horizontal.
            Will have to calculate the loading coil L maybe less than 1 H=
 with some luck
            This is just a proposal at present
            de mal/g3kev
            =20
            =20
            =20

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