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Date: Thu, 12 Sep 2013 20:35:44 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: 630m WSPR this evening
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Hi Roger,

Some more details please. What is the loop's cross section area. What 
type of wire did you use? What TX power? Will you some day try to get an 
antenna efficiency that is as good as possible for the given QTH?
Did you actually move to a QTH with even more restricted antenna 
possibilities???
I'm watching!

73, Stefan/DK7FC

Am 12.09.2013 20:15, schrieb Roger Lapthorn:
> 'Recently I moved 350m east (!) to a new QTH and I've been 
> experimenting with 630m WSPR.
>
> My initial tests were with the transverter on my website feeding a 
> pair of earth-electrodes but with a shorter baseline than was possible 
> at the old QTH (about 12m separation). Although I managed to get 
> reports from G, ON and PA, it was clear that results were nowhere near 
> as good as I obtained at the old QTH. I am speculating that this is 
> due to the effective spacing between earth rods being much shorter and 
> due to buried wires and pipes criss-crossing the lawn. On RX it is 
> working very well though and I have copied most of the nearer 
> Europeans on 630m WSPR.
>
> This afternoon I converted the earth-electrode antenna to an "in the 
> air" loop by disconnecting the earth rods and joining the wire ends 
> with a wire running along the top of the lawn (in the grass). The loop 
> DC resistance is 0.9 ohms and it tunes sharply with about 1.7nF. 
> Matching is via a 3C90 step-down toroid.
>
> Initial encouraging reports include first spots from M0PPP, who had 
> failed to copy me before from this QTH, as well as PA3ABK/2 and G8HUH.
>
> If anyone else can look for me this evening I'd appreciate it. The 
> loop is not very high and can be further improved if results this 
> evening are encouraging.
>
> 73s
> Roger G3XBM
>
> -- 
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> https://sites.google.com/site/sub9khz/
> http://qss2.blogspot.com/
> http://www.youtube.com/user/g3xbm <http://www.youtube.com/user/G3XBM>
>

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Hi Roger, <br>
<br>
Some more details please. What is the loop's cross section area. What
type of wire did you use? What TX power? Will you some day try to get
an antenna efficiency that is as good as possible for the given QTH? <br>
Did you actually move to a QTH with even more restricted antenna
possibilities???<br>
I'm watching!<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 12.09.2013 20:15, schrieb Roger Lapthorn:
<blockquote
 cite="mid:CAHAQVWO8ikPN=LZxTixOpiz_AHD+YDGHEPBsdUkwLhqvANY06Q@mail.gmail.com"
 type="cite">
  <div dir="ltr">'Recently I moved 350m east (!) to a new QTH and I've
been experimenting with 630m WSPR. <br>
  <br>
My initial tests were with the transverter on my website feeding a pair
of earth-electrodes but with a shorter baseline than was possible at
the old QTH (about 12m separation). Although I managed to get reports
from G, ON and PA, it was clear that results were nowhere near as good
as I obtained at the old QTH. I am speculating that this is due to the
effective spacing between earth rods being much shorter and due to
buried wires and pipes criss-crossing the lawn. On RX it is working
very well though and I have copied most of the nearer Europeans on 630m
WSPR. <br>
  <br>
This afternoon I converted the earth-electrode antenna to an "in the
air" loop by disconnecting the earth rods and joining the wire ends
with a wire running along the top of the lawn (in the grass). The loop
DC resistance is 0.9 ohms and it tunes sharply with about 1.7nF.
Matching is via a 3C90 step-down toroid.<br>
  <br>
Initial encouraging reports include first spots from M0PPP, who had
failed to copy me before from this QTH, as well as PA3ABK/2 and G8HUH.<br>
  <br>
If anyone else can look for me this evening I'd appreciate it. The loop
is not very high and can be further improved if results this evening
are encouraging.<br>
  <br>
73s<br>
Roger G3XBM<br clear="all">
  <br>
-- <br>
  <div dir="ltr"><a moz-do-not-send="true"
 href="http://g3xbm-qrp.blogspot.com/" target="_blank">http://g3xbm-qrp.blogspot.com/</a><br>
  <a moz-do-not-send="true" href="http://www.g3xbm.co.uk"
 target="_blank">http://www.g3xbm.co.uk</a><br>
  <a moz-do-not-send="true"
 href="https://sites.google.com/site/sub9khz/" target="_blank">https://sites.google.com/site/sub9khz/</a><br>
  <a moz-do-not-send="true" href="http://qss2.blogspot.com/"
 target="_blank">http://qss2.blogspot.com/</a><br>
  <a moz-do-not-send="true" href="http://www.youtube.com/user/G3XBM"
 target="_blank">http://www.youtube.com/user/g3xbm</a><br>
  <br>
  </div>
  </div>
</blockquote>
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