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From: Roger Lapthorn <rogerlapthorn@gmail.com>
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Message-Id: <D971A224-7C9F-47D0-9068-D9D3698CA047@gmail.com>
Date: Sun, 1 May 2011 18:33:18 +0100
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
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Subject: Re: LF: Re: 325km with the QRPp QRSS30 beacon
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Mal

The frequency is precisely the same as measured by G3WCB and the periodici=
ty (shown on Henny's full screen grab) matches exactly the QRSS30 sequence=
 I was using. Maybe just 3dB more and we'd have full ID of the callsign wh=
ich would be great.=20

73s
Roger G3XBM

Via my 2.4GHz handheld (iPod Touch 4g)

On 1 May 2011, at 18:25, "mal hamilton" <g3kevmal@talktalk.net> wrote:

> If it was not fully readable how did he know it was you ?
> g3kev
> =20
> ----- Original Message -----
> From: Roger Lapthorn
> To: rsgb_lf_group@blacksheep.org
> Sent: Sunday, May 01, 2011 6:05 PM
> Subject: LF: 325km with the QRPp QRSS30 beacon
>=20
> "Because of the extremely low antenna efficiencies, 136kHz is not a band=
 for low power transmitters" - a quote from page 67 of "LF Today", the exc=
ellent book by G3XDV and M0BMU.
>=20
> Henny PA3CPM has sent me a screen shot taken this morning that shows my=
 signal reaching him in Holland. Just a few dB more would make quite a dif=
ference and make the signal fully readable. I am very grateful to Henny (a=
nd others) for working so hard to find me.
>=20
> I continue to be amazed, and really pleased, that something this simple=
 (2.4W RF, 50uW ERP, QRPp beacon TX and a simple thin wire loop antenna)=
 can be detected so far away, although I know others have done far better.=
  Of course, I accept it would not be possible without the signal processi=
ng available to us on the RX end and the skill of those like Henny winklin=
g out the signal from the noise.=20
>=20
> ....but maybe in the next edition of the book, the words should be chang=
ed? :-)=20
>=20
> 73s
> Roger G3XBM
>=20
>=20
> --=20
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/g3xbm
> https://sites.google.com/site/sub9khz/
>=20

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<html><body bgcolor="#FFFFFF"><div>Mal</div><div><br></div><div>The frequency is precisely the same as measured by G3WCB and the periodicity (shown on Henny's full screen grab) matches exactly the QRSS30 sequence I was using. Maybe just 3dB more and we'd have full ID of the callsign which would be great.&nbsp;</div><div><br></div><div>73s</div><div>Roger G3XBM</div><div><br>Via my 2.4GHz handheld (iPod Touch 4g)</div><div><br>On 1 May 2011, at 18:25, "mal hamilton" &lt;<a href="mailto:g3kevmal@talktalk.net">g3kevmal@talktalk.net</a>&gt; wrote:<br><br></div><div></div><blockquote type="cite"><div>

<div><font face="Arial">If it was not fully readable how did he know it was you 
?</font></div>
<div><font face="Arial">g3kev</font></div>
<div><font face="Arial"></font>&nbsp;</div>
<blockquote style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <div style="FONT: 10pt arial">----- Original Message ----- </div>
  <div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><b>From:</b> 
  <a title="rogerlapthorn@gmail.com" href="mailto:rogerlapthorn@gmail.com">Roger 
  Lapthorn</a> </div>
  <div style="FONT: 10pt arial"><b>To:</b> <a title="rsgb_lf_group@blacksheep.org" href="mailto:rsgb_lf_group@blacksheep.org"><a href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a></a> 
  </div>
  <div style="FONT: 10pt arial"><b>Sent:</b> Sunday, May 01, 2011 6:05 PM</div>
  <div style="FONT: 10pt arial"><b>Subject:</b> LF: 325km with the QRPp QRSS30 
  beacon</div>
  <div><br></div>
  <div style="MARGIN-LEFT: 40px"><b><i>"Because of the extremely low antenna 
  efficiencies, 136kHz is not a band for low power transmitters" - a quote from 
  page 67 of "LF Today", the excellent book by G3XDV and 
  M0BMU.</i></b><br></div><br>Henny PA3CPM has sent me a screen shot taken this 
  morning that shows my signal reaching him in Holland. Just a few dB more would 
  make quite a difference and make the signal fully readable. I am very grateful 
  to Henny (and others) for working so hard to find me.<br><br>I continue to be 
  amazed, and really pleased, that something this simple (2.4W RF, 50uW ERP, 
  QRPp beacon TX and a simple thin wire loop antenna) can be detected so far 
  away, although I know others have done far better.&nbsp; Of course, I accept 
  it would not be possible without the signal processing available to us on the 
  RX end and the skill of those like Henny winkling out the signal from the 
  noise. <br><br>....but maybe in the next edition of the book, the words should 
  be changed? :-) <br><br>73s<br>Roger G3XBM<br><br clear="all"><br>-- <br><a href="http://g3xbm-qrp.blogspot.com/" target="_blank"><a href="http://g3xbm-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.com/</a></a><br><a href="http://www.g3xbm.co.uk" target="_blank"><a href="http://www.g3xbm.co.uk">http://www.g3xbm.co.uk</a></a><br><a href="http://www.youtube.com/user/g3xbm" target="_blank"><a href="http://www.youtube.com/user/g3xbm">http://www.youtube.com/user/g3xbm</a></a><br><a href="https://sites.google.com/site/sub9khz/" target="_blank"><a href="https://sites.google.com/site/sub9khz/">https://sites.google.com/site/sub9khz/</a></a><br><br></blockquote>
</div></blockquote></body></html>

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