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Date: Sun, 18 Jul 2010 22:18:45 +0100
Message-ID: <AANLkTimWl17mM3DTHmlnfiNyEtwrCLe7DsuhCHSh8Um7@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: 136.96kHz testing
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Alan,

Yes, that ties up with the signal being stronger with the E-field probe held
above my head. Agreed, that lambda/2pi is around 350m, so I'm only just
exiting the near field region. Tomorrow I may do some QRSS3 tests locally to
see if I can see the QRPp 136kHz signal a few kms away with E-field probe
and FT817.

When I get properly started on the band - with a "real" (up in the air)
antenna and some more power - I'd appreciate some reports from you Alan. You
are indeed at a useful distance from me.

It may take me some time to get things together but 136kHz is a project that
is slowly gathering some momentum here now. With HF being nothing to get
excited about at the moment, I think 136kHz will be worth a try.

73s
Roger G3XBM



On 18 July 2010 21:52, Alan Melia <alan.melia@btinternet.com> wrote:

> Hi Roger dont forget the e-field probe has a sensitivity which is related
> to
> its height not the length of the whip. If you are holding a conducting case
> the effective height is say 2m , at carrying heigh say 1m the signal
> collected will only be half as strong. You are barely out of the near field
> at 400m but getting close.
>
> Unfortunately I dont have a an LF receiver and aerial connected up at the
> moment, I will have to sort that out because at 50 miles (ish) I would be
> an
> interesting distance for you..
>
> Alan G3NYK
>
> ----- Original Message -----
> From: "Roger Lapthorn" <rogerlapthorn@gmail.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Sunday, July 18, 2010 8:50 PM
> Subject: Re: LF: 136.96kHz testing
>
>
> > The measured power out from the PA is actually 250mW going into the earth
> > electrodes. As a test I connected a PA0RDT designed active
> > antenna<http://carc.org.uk//carc_ftp/G3GRO-PA0RDT-Active_Ant.pdf>run
> > from a 9V PP3 battery and connected this to the (deaf at 136kHz) FT817
> > and went for my walk across the fields. The signal was copyable (not
> strong)
> > at 0.4km with 10wpm CW. Signal was stronger if I held the E-field probe
> > above my head.
> >
> > Those of you like Mal who work multiple continents on the band will thing
> > this is nothing, but it gives me a starting point from which to
> > progressively improve my system. I'm just amazed that 250mW into earth
> > electrodes 20m apart can be heard Q5 at 0.4km with a 19 inch whip
> handheld.
> >
> > More fun next week...
> >
> > 73s
> > Roger G3XBM
> >
> > On 18 July 2010 17:14, Roger Lapthorn <rogerlapthorn@gmail.com> wrote:
> >
> > > *This is the very beginning of my journey onto 136kHz....
> > >
> > > *For anyone very *very* close to Burwell, Cambs, JO02DG, I'm putting a
> QRP
> > > 10wpm keyer-generated CW message (later to be changed to QRSS3) out on
> > > 136.96kHz CW into my earth electrode antenna. Power from the TX is
> about
> > > 500mW, so ERP is just a few microwatts at most.
> > >
> > > I'd appreciate reports, but be amazed to get any until I start to run
> some
> > > more power into a real antenna.
> > >
> > > 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
> >
>
>
>


-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088

--000325558c9e476f34048bafff48
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Alan,<br><br>Yes, that ties up with the signal being stronger with the E-f=
ield probe held above my head. Agreed, that lambda/2pi is around 350m, so=
 I&#39;m only just exiting the near field region. Tomorrow I may do some=
 QRSS3 tests locally to see if I can see the QRPp 136kHz signal a few kms=
 away with E-field probe and FT817. <br>
<br>When I get properly started on the band - with a &quot;real&quot; (up=
 in the air) antenna and some more power - I&#39;d appreciate some reports=
 from you Alan. You are indeed at a useful distance from me. <br><br>It ma=
y take me some time to get things together but 136kHz is a project that is=
 slowly gathering some momentum here now. With HF being nothing to get exc=
ited about at the moment, I think 136kHz will be worth a try.<br>
<br>73s<br>Roger G3XBM<br><br><br><br><div class=3D"gmail_quote">On 18 Jul=
y 2010 21:52, Alan Melia <span dir=3D"ltr">&lt;<a href=3D"mailto:alan.meli=
a@btinternet.com">alan.melia@btinternet.com</a>&gt;</span> wrote:<br><bloc=
kquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; border-le=
ft: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi Roger dont forget the e-field probe has a sensitivity which is related=
 to<br>
its height not the length of the whip. If you are holding a conducting cas=
e<br>
the effective height is say 2m , at carrying heigh say 1m the signal<br>
collected will only be half as strong. You are barely out of the near fiel=
d<br>
at 400m but getting close.<br>
<br>
Unfortunately I dont have a an LF receiver and aerial connected up at the<=
br>
moment, I will have to sort that out because at 50 miles (ish) I would be=
 an<br>
interesting distance for you..<br>
<br>
Alan G3NYK<br>
<div class=3D"im"><br>
----- Original Message -----<br>
From: &quot;Roger Lapthorn&quot; &lt;<a href=3D"mailto:rogerlapthorn@gmail=
.com">rogerlapthorn@gmail.com</a>&gt;<br>
To: &lt;<a href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blac=
ksheep.org</a>&gt;<br>
</div><div class=3D"im">Sent: Sunday, July 18, 2010 8:50 PM<br>
Subject: Re: LF: 136.96kHz testing<br>
<br>
<br>
</div><div class=3D"im">&gt; The measured power out from the PA is actuall=
y 250mW going into the earth<br>
&gt; electrodes. As a test I connected a PA0RDT designed active<br>
</div><div><div></div><div class=3D"h5">&gt; antenna&lt;<a href=3D"http://=
carc.org.uk//carc_ftp/G3GRO-PA0RDT-Active_Ant.pdf" target=3D"_blank">http:=
//carc.org.uk//carc_ftp/G3GRO-PA0RDT-Active_Ant.pdf</a>&gt;run<br>
&gt; from a 9V PP3 battery and connected this to the (deaf at 136kHz) FT81=
7<br>
&gt; and went for my walk across the fields. The signal was copyable (not<=
br>
strong)<br>
&gt; at 0.4km with 10wpm CW. Signal was stronger if I held the E-field pro=
be<br>
&gt; above my head.<br>
&gt;<br>
&gt; Those of you like Mal who work multiple continents on the band will=
 thing<br>
&gt; this is nothing, but it gives me a starting point from which to<br>
&gt; progressively improve my system. I&#39;m just amazed that 250mW into=
 earth<br>
&gt; electrodes 20m apart can be heard Q5 at 0.4km with a 19 inch whip<br>
handheld.<br>
&gt;<br>
&gt; More fun next week...<br>
&gt;<br>
&gt; 73s<br>
&gt; Roger G3XBM<br>
&gt;<br>
&gt; On 18 July 2010 17:14, Roger Lapthorn &lt;<a href=3D"mailto:rogerlapt=
horn@gmail.com">rogerlapthorn@gmail.com</a>&gt; wrote:<br>
&gt;<br>
&gt; &gt; *This is the very beginning of my journey onto 136kHz....<br>
&gt; &gt;<br>
&gt; &gt; *For anyone very *very* close to Burwell, Cambs, JO02DG, I&#39;m=
 putting a<br>
QRP<br>
&gt; &gt; 10wpm keyer-generated CW message (later to be changed to QRSS3)=
 out on<br>
&gt; &gt; 136.96kHz CW into my earth electrode antenna. Power from the TX=
 is about<br>
&gt; &gt; 500mW, so ERP is just a few microwatts at most.<br>
&gt; &gt;<br>
&gt; &gt; I&#39;d appreciate reports, but be amazed to get any until I sta=
rt to run<br>
some<br>
&gt; &gt; more power into a real antenna.<br>
&gt; &gt;<br>
&gt; &gt; 73s<br>
&gt; &gt; Roger G3XBM<br>
&gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; --<br>
&gt; &gt; <a href=3D"http://g3xbm-qrp.blogspot.com/" target=3D"_blank">htt=
p://g3xbm-qrp.blogspot.com/</a><br>
&gt; &gt; <a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">http://www.=
g3xbm.co.uk</a><br>
&gt; &gt; <a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">=
http://www.youtube.com/user/g3xbm</a><br>
&gt; &gt; G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088<br>
&gt; &gt;<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; --<br>
&gt; <a href=3D"http://g3xbm-qrp.blogspot.com/" target=3D"_blank">http://g=
3xbm-qrp.blogspot.com/</a><br>
&gt; <a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">http://www.g3xbm=
.co.uk</a><br>
&gt; <a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">http:=
//www.youtube.com/user/g3xbm</a><br>
&gt; G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088<br>
&gt;<br>
<br>
<br>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D=
"http://g3xbm-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.com/</a><br><a=
 href=3D"http://www.g3xbm.co.uk">http://www.g3xbm.co.uk</a><br><a href=3D"=
http://www.youtube.com/user/g3xbm">http://www.youtube.com/user/g3xbm</a><b=
r>
G3XBM=A0 =A0 GQRP 1678=A0 =A0 =A0 ISWL G11088<br>

--000325558c9e476f34048bafff48--