Message-ID: <20100114214523.i1xor1rdk0ccogkg@webmail6.kuleuven.be>
Date: Thu, 14 Jan 2010 21:45:23 +0100
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
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Subject: Re: LF: Re: 1/2 wave 500
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Jay, Mal,

I think that a "low" dipole is only meaningfull above poor soil.
At 20 ft (6m) above a perfect ground the radiation resistance would be =20
only 0.25 Ohm.
But in contradiction to a short vertical the dipole would work better =20
over poor soil.
At 100ft a dipole would have a radiation resistance of about 6 Ohm =20
(over perfect ground.
But even at this height it will radiate at very high angles (as Mal =20
suggests), so probably good for Europe but poor for DX.

73, Rik  ON7YD - OR7T

Quoting "jrusgrove@comcast.net" <jrusgrove@comcast.net>:

> Mal
>
> I worked WD2XSH/35 in South Dakota a couple weekends ago and heard  =20
> him a couple times since. Here's
> his e mail to me on his setup. Think it should read one leg N/S and  =20
> the other is E/W. Note that it
> is at 20 feet! Appears to work.
>
> Jay W1VD  WD2XNS  WE2XGR/2
>
> ____________
>
> Jay,
>
> I have an ICOM 706MKIIG feeding aqn attenuator which feeds a  =20
> transverter from 7.2 MHz to 500 KHz.
> The transverter is feeding a solid state amp.  I am running about 10 =20
>  - 15 watts ERP.  The antenna is
> a half wave dipole on 500 KHz about 20 feet above the ground in a  =20
> N/S and E/W configuration. one leg
> is N/S and the other is N/S.
>
> I am listening on a ICOM 756PROII and a HyGain Hytower.
>
> 73
>
> Jim
>
> WD2XSH/35  K0HW
>
> ----- Original Message -----
> From: mal hamilton
> To: rsgb
> Sent: Thursday, January 14, 2010 10:45 AM
> Subject: LF: 1/2 wave 500
>
>
> Hi
> Has anyone in the USA tried a 1/2 wave dipole on 500 K/cs? inv V  =20
> design, at a modest height around
> 100 ft.
> de mal/g3kev
>
>
>