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	<4CF3C7D7.8070706@iup.uni-heidelberg.de>
Date: Mon, 29 Nov 2010 19:24:02 +0000
Message-ID: <AANLkTikHdCqY5+jRcf7=ROc+EhYACVGyuJAagYPH9yyy@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Signal_8970Hz
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Will we soon need a Dreamer's Band "band plan", HI? Activity levels/intere=
st
is certainly growing now that several stations have shown what can be
achieved by radiated propagation, albeit with decent antennas, high power
and extremely narrow bandwidth signals.

On the "keep it simple end" of Dreamer's Band work over here, I'm hoping=
 to
do some more earth mode experiments on 8.760kHz soon, but the weather here
is too bad to get out into the surrounding countryside to look for the
signals with snow and ice on the fields and roads.

My next test is to compare received signals using (a) an earth electrode
pair *versus* (b) the 80cm loop used up to now for receiving. If the
propagation is by utilities assisted earth mode conduction then putting a
30m long earth electrode pair across a fenland road should give me very
tight coupling to whatever is buried in the roads and lanes; I'm assuming
that a loop is formed within the ground to some depth surrounding the enti=
re
road and services within it.

I've still to find out just how far the existing system can reach in all
directions, but I know at least 5.3km is achievable with just 4-5W in
favourable directions with QRSS3. Clearly this is not radiated propagation=
.
At the weekend I built a small preamp to use with the earth electrode syst=
em
using a grounded gate FET with the drain circuit tuned to 8-9kHz feeding
into the PC soundcard via an emitter follower. I'm looking forward to some
more radiated tests by G3XIZ as I suspect my receiving set-up here using
this is now better than before. The simple circuit has good rejection of
50Hz mains and LF/MF broadcast intermod at 9kHz.

Keep up the good work Stefan, Marcus, Ossi etc

73s
Roger G3XBM


2010/11/29 Stefan Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg.de>

>  Hi Lubos,
>
> Interesting! And very nice that you are monitoring now! Maybe it was
> Gerhard/OE3GHB? He is in about 40km to you if i remember correctly. It
> wasn't me ;-)
> Exciting! :-)
>
> 73, Stefan
>
> Am 29.11.2010 15:40, schrieb Lubos OK2BVG:
>
> Hello LF!
> I saw some signal on 8.97kHz this morning. Was it local QRM only, or any
> test of transmitting?
>
>  Lubos, OK2BVG, JN88KS
>
>


--=20
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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Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Will we soon need a Dreamer&#39;s Band &quot;band plan&quot;, HI? Activity=
 levels/interest is certainly growing now that several stations have shown=
 what can be achieved by radiated propagation, albeit with decent antennas=
, high power and extremely narrow bandwidth signals.<br>
<br>On the &quot;keep it simple end&quot; of Dreamer&#39;s Band work over=
 here, I&#39;m hoping to do some more earth mode experiments on 8.760kHz=
 soon, but the weather here is too bad to get out into the surrounding cou=
ntryside to look for the signals with snow and ice on the fields and roads=
. <br>
<br>My next test is to compare received signals using (a) an earth electro=
de pair <i>versus</i> (b) the 80cm loop used up to now for receiving. If=
 the propagation is by utilities assisted earth mode conduction then putti=
ng a 30m long earth electrode pair across a fenland road should give me ve=
ry tight coupling to whatever is buried in the roads and lanes; I&#39;m as=
suming that a loop is formed within the ground to some depth surrounding=
 the entire road and services within it. <br>
<br>I&#39;ve still to find out just how far the existing system can reach=
 in all directions, but I know at least 5.3km is achievable with just 4-5W=
 in favourable directions with QRSS3. Clearly this is not radiated propaga=
tion. At the weekend I built a small preamp to use with the earth electrod=
e system using a grounded gate FET with the drain circuit tuned to 8-9kHz=
 feeding  into the PC soundcard via an emitter follower. I&#39;m looking=
 forward to some more radiated tests by G3XIZ as I suspect my receiving se=
t-up here using this is now better than before. The simple circuit has goo=
d rejection of 50Hz mains and LF/MF broadcast intermod at 9kHz.<br>
<br>Keep up the good work Stefan, Marcus, Ossi etc<br><br>73s<br>Roger G3X=
BM<br><br><br><div class=3D"gmail_quote">2010/11/29 Stefan Sch=E4fer <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:Stefan.Schaefer@iup.uni-heidelberg.de">=
Stefan.Schaefer@iup.uni-heidelberg.de</a>&gt;</span><br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; bord=
er-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">


 =20

<div bgcolor=3D"#ffffff" text=3D"#000000">
Hi Lubos,<br>
<br>
Interesting! And very nice that you are monitoring now! Maybe it was
Gerhard/OE3GHB? He is in about 40km to you if i remember correctly. It
wasn&#39;t me ;-)<br>
Exciting! :-)<br>
<br>
73, Stefan<br>
<br>
Am 29.11.2010 15:40, schrieb Lubos OK2BVG:
<div class=3D"im"><blockquote type=3D"cite">
  Hello
LF!
  <div>I saw some signal on 8.97kHz this morning. Was it local QRM
only, or any test of transmitting?</div>
  <div><br>
  </div>
  <div>Lubos, OK2BVG, JN88KS=A0</div>
</blockquote>
</div></div>

</blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http://g3xb=
m-qrp.blogspot.com/" target=3D"_blank">http://g3xbm-qrp.blogspot.com/</a><=
br><a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">http://www.g3xbm.c=
o.uk</a><br>
<a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">http://www=
.youtube.com/user/g3xbm</a><br>G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088<=
br>

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