Message-ID: <20100123161524.ajhx17uwv4k0k48w@webmail6.kuleuven.be>
Date: Sat, 23 Jan 2010 16:15:24 +0100
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
References: <9afca2641001230502q45fb0825n3ee7dca1774c95eb@mail.gmail.com>
	<20100123151204.tm00cc8fmogkc80g@webmail6.kuleuven.be>
	<9afca2641001230646l55038t2e03f54f763a829a@mail.gmail.com>
In-Reply-To: <9afca2641001230646l55038t2e03f54f763a829a@mail.gmail.com>
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Subject: Re: LF: G3XBM's ERP on 500kHz
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Hello Roger,

you can download MMANA from
http://mmhamsoft.amateur-radio.ca/pages/mmana-gal.php

The datafile for your antenna is attached

73, Rik  ON7YD

Quoting Roger Lapthorn <rogerlapthorn@gmail.com>:

> Thanks Rik.
>
> It is good to know that the your figures more or less agree having  =20
> done some proper simulations. Is it possible to email me these  =20
> simulations please?
>
> 73s
> Roger G3XBM
>
> On 23 January 2010 14:12, Rik Strobbe  =20
> <Rik.Strobbe@fys.kuleuven.be<mailto:Rik.Strobbe@fys.kuleuven.be>>  =20
> wrote:
> Roger,
>
> I simulated the antenna based on your description (with MMANA) and  =20
> the current through the vertical wire seems to be quite constant. So =20
>  the tophat works well and the effective height will be more or less =20
>  the physical height.
> The simulation gives a radiation resistance of 0.074 Ohm, so with  =20
> 0.12 A a radiated power just over 1mW EMRP (1.75mW ERP).
> In the real world it will be some dB's less (as Jim stated  =20
> recently), probably something like 0,5 to 1mW ERP.
>
> Very impressive that it covers over 1200km.
>
> 73, Rik  ON7YD - OR7T
>
>
> Quoting Roger Lapthorn  =20
> <rogerlapthorn@gmail.com<mailto:rogerlapthorn@gmail.com>>:
>
> All,
>
> Yesterday I did a recalculation of the G3XBM ERP based on the   =20
> classic formula and re-measurements of my antenna current. My   =20
> antenna is a 5m long vertical with a spiral top hat of about 7 turns =20
>   about 1.5m x 1.5m. Not being clear how to model the top hat I   =20
> assumed effective heights of 5, 4 or 3m. The measured antenna   =20
> current is 0.12A.
>
> My results are as follows:
>
> Assumed effective height 5m     ERP =3D 1.53mW
> Assumed effective height 4m     ERP =3D 0.98mW
> Assumed effective height 3m     ERP =3D 0.55mW
>
> So, I believe my 1mW ERP previously calculated is not a bad   =20
> estimate, and it may indeed be lower than this figure.
>
> 73s
> Roger G3XBM
> --
>
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/G3XBM
> G3XBM    GQRP 1678      ISWL G11088
>
>
>
>
>
>
>
> --
>
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/G3XBM
> G3XBM    GQRP 1678      ISWL G11088
>


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*
0.5025
***Wires***
29
0.0,=090.0,=090.0,=090.0,=090.0,=095.0,=090.002,=09-1
0.0,=090.0,=095.0,=09-0.2,=090.0,=095.0,=090.002,=09-1
-0.2,=090.0,=095.0,=090.0,=09-0.2,=095.0,=090.002,=09-1
0.0,=09-0.2,=095.0,=090.2,=090.0,=095.0,=090.002,=09-1
0.2,=090.0,=095.0,=090.0,=090.2,=095.0,=090.002,=09-1
0.0,=090.2,=095.0,=09-0.4,=090.0,=095.0,=090.002,=09-1
-0.4,=090.0,=095.0,=090.0,=09-0.4,=095.0,=090.002,=09-1
0.0,=09-0.4,=095.0,=090.4,=090.0,=095.0,=090.002,=09-1
0.4,=090.0,=095.0,=090.0,=090.4,=095.0,=090.002,=09-1
0.0,=090.4,=095.0,=09-0.6,=090.0,=095.0,=090.002,=09-1
-0.6,=090.0,=095.0,=090.0,=09-0.6,=095.0,=090.002,=09-1
0.0,=09-0.6,=095.0,=090.6,=090.0,=095.0,=090.002,=09-1
0.6,=090.0,=095.0,=090.0,=090.6,=095.0,=090.002,=09-1
0.0,=090.6,=095.0,=09-0.8,=090.0,=095.0,=090.002,=09-1
-0.8,=090.0,=095.0,=090.0,=09-0.8,=095.0,=090.002,=09-1
0.0,=09-0.8,=095.0,=090.8,=090.0,=095.0,=090.002,=09-1
0.8,=090.0,=095.0,=090.0,=090.8,=095.0,=090.002,=09-1
0.0,=090.8,=095.0,=09-1.0,=090.0,=095.0,=090.002,=09-1
-1.0,=090.0,=095.0,=090.0,=09-1.0,=095.0,=090.002,=09-1
0.0,=09-1.0,=095.0,=091.0,=090.0,=095.0,=090.002,=09-1
1.0,=090.0,=095.0,=090.0,=091.0,=095.0,=090.002,=09-1
0.0,=091.0,=095.0,=09-1.2,=090.0,=095.0,=090.002,=09-1
-1.2,=090.0,=095.0,=090.0,=09-1.2,=095.0,=090.002,=09-1
0.0,=09-1.2,=095.0,=091.2,=090.0,=095.0,=090.002,=09-1
1.2,=090.0,=095.0,=090.0,=091.2,=095.0,=090.002,=09-1
0.0,=091.2,=095.0,=09-1.4,=090.0,=095.0,=090.002,=09-1
-1.4,=090.0,=095.0,=090.0,=09-1.4,=095.0,=090.002,=09-1
0.0,=09-1.4,=095.0,=091.4,=090.0,=095.0,=090.002,=09-1
1.4,=090.0,=095.0,=090.0,=091.4,=095.0,=090.002,=09-1
***Source***
1,=091
w1b,=090.0,=091.0
***Load***
0,=091
***Segmentation***
3000,=09600,=091.01,=091
***G/H/M/R/AzEl/X***
2,=090.0,=090,=0950.0,=09120,=0960,=090.0
###Comment###
Mod by Rik, OR7T 23/01/2010 15:12:29
Created by Rik, OR7T 23/01/2010 14:21:22
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