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Date: Sun, 18 Aug 2013 14:43:19 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: QRM on 472.5kHz
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Hi Clemens, MF,

Some more thoughts about QSY:

Am 18.08.2013 11:38, schrieb Clemens Paul:
> In the mean time it would be a good idea to stay away at least 2kHz from the
> usual calling qrg 472,5 when you are rag chewing for hours which was
> interesting to listen to.:-)
> The band is wide and empty enough so there is plenty of room to choose.

_The problem is: _
There are only a few active CW stations on that band (over the year, not 
arround xmas time). CW activity can be found between 474...473 kHz (> 
90% of all QSOs).
And: The regular active CW stations are the stronger ones!!
The reason is simple: If you struggle a long time just to get the 
station deteils of the other station for the logbook, then you are happy 
and tend to finish the QSO before the signal is lost in QSB completely. 
You will not talk for hours, talking about others antenna :-) , when the 
RST is 239!
QRP stations prefer to do WSPR only or have short QSOs.( OK, the UK may 
be an exception here, because the station density is much higher and 
they can find active stations in a smaler range, which is fine.)

Now, if these few active stations are splitting each other on the entire 
band, it will be even more harder to find a QSO partner. And RX stations 
will tend to choose the frequency where they can actually listen to a 
QSO while doing other things in the background (like building linear 
PAs), as you did last night.
After some time, the actual center of CW activity would move then to 
where activity can be found. And if it is true that the active stations 
are the strong stations, then someone will come with the idea to make 
QSY from that fequency :-)

73, Stefan/DK7FC

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Hi Clemens, MF, <br>
<br>
Some more thoughts about QSY:<br>
<br>
Am 18.08.2013 11:38, schrieb Clemens Paul:
<blockquote cite="mid:0127125B54F94B748D9AC87A4A813300@Clemens0811"
 type="cite">
  <pre wrap="">In the mean time it would be a good idea to stay away at least 2kHz from the
usual calling qrg 472,5 when you are rag chewing for hours which was
interesting to listen to.:-)
The band is wide and empty enough so there is plenty of room to choose.</pre>
</blockquote>
<br>
<u>The problem is: </u><br>
There are only a few active CW stations on that band (over the year,
not arround xmas time). CW activity can be found between 474...473 kHz
(&gt; 90% of all QSOs). <br>
And: The regular active CW stations are the stronger ones!! <br>
The reason is simple: If you struggle a long time just to get the
station deteils of the other station for the logbook, then you are
happy and tend to finish the QSO before the signal is lost in QSB
completely. You will not talk for hours, talking about others antenna
:-) , when the RST is 239!<br>
QRP stations prefer to do WSPR only or have short QSOs.( OK, the UK may
be an exception here, because the station density is much higher and
they can find active stations in a smaler range, which is fine.)<br>
<br>
Now, if these few active stations are splitting each other on the
entire band, it will be even more harder to find a QSO partner. And RX
stations will tend to choose the frequency where they can actually
listen to a QSO while doing other things in the background (like
building linear PAs), as you did last night.<br>
After some time, the actual center of CW activity would move then to
where activity can be found. And if it is true that the active stations
are the strong stations, then someone will come with the idea to make
QSY from that fequency :-)<br>
<br>
73, Stefan/DK7FC<br>
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