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Date: Tue, 14 Dec 2010 19:10:22 +0000
Message-ID: <AANLkTikHzkid4hdWABjVHmKVgQV8AJBfB9y0RqBtNLab@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: BODGE ANTENNAS
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Mal,

Please, I make *no* magical claims for the earth electrode antenna I use.
All I say is that, in certain circumstances, it works rather better than one
might expect both on RX and TX on VLF/LF/MF.

In my view it *does* work as a loop antenna on 136 and 500kHz with the loop
area being determined by the soil conductivity (lower conductivity, bigger
loop area).  The very fact that it is low-Q does suggest loss. Yes, a fully
"in the air" loop works better on both 136 and 500kHz. On 8-9kHz it is far
less clear if this is acting as a loop or just a voltage potential in the
ground. Making an efficient "in the air" TX loop at 8-9kHz may be a
challenge.

I've managed to receive DK7FC on 8.97kHz - have you? - and this was using
the very same earth electrode system being used for my earth mode
experiments, and for recent tests on 500kHz. A "proper" loop antenna would
have yielded several dB improvement in received signal level on 8.97kHz I do
accept.

Again, all I am claiming is the structure is worth trying in some
situations, not that it works by some sort of magic potion that has been
fermented in my garage.

73s
Roger G3XBM





On 14 December 2010 18:45, mal hamilton <g3kevmal@talktalk.net> wrote:

>  I am of the opinion what some on here describe as Earth Mode antennas are
> BODGE antennas.
> Old timers cannot be fooled but it is very misleading for New comers to
> LF/MF
> G3KEV
>
>



-- 
g3xbm-qrp.blogspot.com/
www.g3xbm.co.uk
www.youtube.com/user/g3xbm
<http://vlf_grabber>G3XBM   GQRP 1678    ISWL G11088

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Mal,<br><br>Please, I make <i>no</i> magical claims for the earth electrod=
e antenna I use. All I say is that, in certain circumstances, it works rat=
her better than one might expect both on RX and TX on VLF/LF/MF.<br><br>In=
 my view it <u>does</u> work as a loop antenna on 136 and 500kHz with the=
 loop area being determined by the soil conductivity (lower conductivity,=
 bigger loop area).=A0 The very fact that it is low-Q does suggest loss.=
 Yes, a fully &quot;in the air&quot; loop works better on both 136 and 500=
kHz. On 8-9kHz it is far less clear if this is acting as a loop or just a=
 voltage potential in the ground. Making an efficient &quot;in the air&quo=
t; TX loop at 8-9kHz may be a challenge.<br>
<br>I&#39;ve managed to receive DK7FC on 8.97kHz - have you? - and this wa=
s using the very same earth electrode system being used for my earth mode=
 experiments, and for recent tests on 500kHz. A &quot;proper&quot; loop an=
tenna would have yielded several dB improvement in received signal level=
 on 8.97kHz I do accept.<br>
<br>Again, all I am claiming is the structure is worth trying in some situ=
ations, not that it works by some sort of magic potion that has been ferme=
nted in my garage. <br><br>73s<br>Roger G3XBM<br><br><br><br><br><br><div=
 class=3D"gmail_quote">
On 14 December 2010 18:45, mal hamilton <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:g3kevmal@talktalk.net">g3kevmal@talktalk.net</a>&gt;</span> wrote:<b=
r><blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; bo=
rder-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">






<div bgcolor=3D"#ffffff">
<div><font face=3D"Arial" size=3D"2">I am of the opinion what some on here=
 describe as=20
Earth Mode antennas are BODGE antennas.</font></div>
<div><font face=3D"Arial" size=3D"2">Old timers cannot be fooled but it is=
 very=20
misleading for New comers to LF/MF</font></div>
<div><font face=3D"Arial" size=3D"2">G3KEV</font></div>
<div>=A0</div></div>
</blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http://g3xb=
m-qrp.blogspot.com/" target=3D"_blank">g3xbm-qrp.blogspot.com/</a><br><a=
 href=3D"http://www.g3xbm.co.uk" target=3D"_blank">www.g3xbm.co.uk</a><br>=
<a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">www.youtub=
e.com/user/g3xbm</a><br>
<a href=3D"http://vlf_grabber" target=3D"_blank"></a>G3XBM=A0=A0 GQRP 1678=
=A0=A0=A0 ISWL G11088<br>

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