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Date: Mon, 21 Oct 2013 16:50:23 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: WSPR 15 tonite
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Hello John,

Well, don't think it is as easy as on HF. We can make the same distances 
BUT on HF we're talking about SSB or CW and on LF we're talking about 
DFCW-180 or so.
In WSPR-2 you can be detected at the antipodes with a few meters of wire 
thrown in the greenery and 5W by a QRP rig. On LF you need really BIG 
antennas and have to spend a lot of effort to reduce the losses and 
increase the radiation resistance. Furthermore you have to deal with 
several (sometimes dozens) of kV on the antenna. And you have (at least 
a bit) to understand what you're doing, while you can press the 
"auto-tune" button on modern HF rigs... That makes LF/MF a special 
community with challenging things to do :-)
I guess a "average" HF amateur can easily make > 10000 km in SSB while a 
well equipped amateur on LF struggles with WSPR-15 to make a > 3000 km 
range.

I'm looking forward to see your first results on the band! Will you 
intend to TX on the bands in the near future?

Still, what type and RX site are you going to use?

73, Stefan/DK7FC

Am 21.10.2013 05:05, schrieb John Lutz:
> Stefan,
> Thanks for the quick reply and the encouragement regarding my choice 
> of the IDC-136.  It is good to know others are using it with success.  
> It sounds like modifications to the receiver itself aren't really 
> necessary.
> I have to admit that I'm really surprised by the distances being 
> achieved at 136 KHz.  I would have expected that a couple hundred 
> miles would be the upper limit, and that even that far would be pretty 
> infrequent.  After looking at the WSPRNet database, I can see that I 
> was very mistaken about that.
> I see lots of reception reports from you for G3XKR (940km), R7NT (2234 
> km), 4X1RF (2850 km), and many other distant stations.  I would never 
> have thought this possible!   :-)
> Regarding my antenna, I will initially use a 7.25 meter ground-mounted 
> vertical.  Normally, I use it for 30-meter operation.  I am in the 
> process of constructing a PA0RDT mini-whip.  I understand that 
> "active" antennas of this type are fairly popular of LF/VLF work.
> Again, thank you for taking time to respond to my email.  I hope to be 
> WSPRNet active very soon.
> 73,
> John / N9JL
>

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Hello John, <br>
<br>
Well, don't think it is as easy as on HF. We can make the same
distances BUT on HF we're talking about SSB or CW and on LF we're
talking about DFCW-180 or so.<br>
In WSPR-2 you can be detected at the antipodes with a few meters of
wire thrown in the greenery and 5W by a QRP rig. On LF you need really
BIG antennas and have to spend a lot of effort to reduce the losses and
increase the radiation resistance. Furthermore you have to deal with
several (sometimes dozens) of kV on the antenna. And you have (at least
a bit) to understand what you're doing, while you can press the
"auto-tune" button on modern HF rigs... That makes LF/MF a special
community with challenging things to do :-)<br>
I guess a "average" HF amateur can easily make &gt; 10000 km in SSB
while a well equipped amateur on LF struggles with WSPR-15 to make a
&gt; 3000 km range. <br>
<br>
I'm looking forward to see your first results on the band! Will you
intend to TX on the bands in the near future?<br>
<br>
Still, what type and RX site are you going to use?<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 21.10.2013 05:05, schrieb John Lutz:
<blockquote
 cite="mid:1382324702.11356.YahooMailNeo@web162604.mail.bf1.yahoo.com"
 type="cite">
  <div
 style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; font-size: 12pt;">
  <div><span>Stefan,</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>Thanks for the quick reply and the encouragement regarding
my choice of the IDC-136.&nbsp; It is good to know others are using it with
success.&nbsp; It sounds like modifications to&nbsp;the receiver itself aren't
really necessary.</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>I have to admit that I'm really surprised by the distances
being achieved&nbsp;at 136 KHz.&nbsp; I&nbsp;would have expected that&nbsp;a couple&nbsp;hundred
miles would be&nbsp;the upper limit, and that even that far&nbsp;would&nbsp;be pretty
infrequent.&nbsp; After looking at&nbsp;the WSPRNet database, I can see that&nbsp;I
was very mistaken about that.</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>I see lots of&nbsp;reception reports from you for G3XKR
(940km),&nbsp;R7NT (2234 km), 4X1RF (2850 km), and many other
distant&nbsp;stations.&nbsp; I would never have thought this possible!&nbsp;&nbsp; :-)</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>Regarding my antenna, I will initially use a&nbsp;7.25 meter
ground-mounted vertical.&nbsp; Normally, I use it&nbsp;for 30-meter operation.&nbsp; I
am in the process of constructing a PA0RDT mini-whip.&nbsp; I understand
that "active" antennas of this type are fairly popular of LF/VLF work.</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>Again, thank you for taking time to respond to my email.&nbsp;
I hope to be WSPRNet active very soon.</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>73,</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>John / N9JL</span></div>
  <div style="display: block;" class="yahoo_quoted">
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